System Contains A Mixture Of Solid Polymer Or At Least One Solid Polymer And At Least One Solid Polymer-forming System Patents (Class 521/81)
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Patent number: 4719039Abstract: An electrically conductive polyethylene foam which is in the form of a profile, e.g. a sheet, having a closed cell foam structure and exhibiting a surface resistivity of not more than 10.sup.5 ohms/square. The sheet is prepared by a continuous method wherein an extruded, foamable, non-crosslinked preform containing a mixture of polyethylene, ethylene copolymer, chemical blowing agent, crosslinking agent and conductive carbon black is heated to produce the foam.Type: GrantFiled: April 30, 1986Date of Patent: January 12, 1988Assignee: Dynamit Nobel of America, Inc.Inventor: Nicholas J. Leonardi
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Patent number: 4714716Abstract: A substantially closed-celled linear polyolefin foam is made by melt processing under pressure a linear polyolefin together with a volatile blowing agent and a crosslinking agent and then expanding the polymer. Suitable crosslinking agents, including azido and vinyl functional silanes, organic peroxides, multifunctional vinyl monomers, and oxygen, increase the melt tension and melt viscosity of the polymer by lightly crosslinking the polymer with itself to enable the production of foams having improved properties in comparison with branched polyolefin foams.Type: GrantFiled: November 16, 1984Date of Patent: December 22, 1987Assignee: The Dow Chemical CompanyInventor: Chung P. Park
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Patent number: 4710522Abstract: Foamable and foamed compositions comprising blends of an aromatic sulfone polymer, a linear polyester and an aromatic polycarbonate are disclosed. The composition, useful as an ovenable food container, is formed in a process in which the three components are intimately admixed, heated and extruded below or above the foamable temperature, depending upon whether a foamable or foamed composition is desired.Type: GrantFiled: October 9, 1986Date of Patent: December 1, 1987Assignee: Mobil Oil CorporationInventor: Mark T. Huggard
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Patent number: 4705811Abstract: An expandable alkenyl aromatic polymer composition and methods of preparation are provided. The composition is admixed with a volatile blowing agent and an expansion aid which includes a polyphenylene ether. The composition may be extruded and then expanded by exposure to steam or hot air or may be impregnated with blowing agent and then expanded.Type: GrantFiled: March 9, 1987Date of Patent: November 10, 1987Assignee: The Dow Chemical CompanyInventor: Chung P. Park
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Patent number: 4702868Abstract: Moldable foam beads comprising a silane-crosslinked polyolefin foam are produced by mixing a composition comprising a silane-modified polyolefin (such as a silane-grafted polyethylene) and a silanol condensation catalyst in an extruder to produce a melt, then injecting a blowing agent into the melt at a rate effective to produce a desired foam density in the extrudate; extruding and cutting the melt to form foam beads; and exposing the foam beads to moisture to produce silane crosslinking of the polyolefin foam.Type: GrantFiled: February 24, 1987Date of Patent: October 27, 1987Assignee: Valcour IncorporatedInventors: Thomas M. Pontiff, Frederick H. Collins
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Patent number: 4695594Abstract: Polyphenylene ether compositions rendered flame retardant with bromine-containing compounds can be foam molded into shaped articles free of streaking and without the generation of odors if the foaming agent comprises citric acid and sodium bicarbonate.Type: GrantFiled: August 27, 1986Date of Patent: September 22, 1987Assignee: General Electric CompanyInventor: Eric Pressman
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Patent number: 4694026Abstract: A process for dimensionally stabilizing low density foamed polyolefins utilizing a dimensionally stabilizing control additive comprising a nitrogen-containing compound (having an unsaturated leg) said compound represented by formulas (I) and (II): ##STR1##Type: GrantFiled: May 24, 1985Date of Patent: September 15, 1987Assignee: The Dow Chemical CompanyInventor: Chung P. Park
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Patent number: 4694027Abstract: An expandable polyolefin composition and a method of preparation are provided. Isobutane or mixtures of isobutane with other physical blowing agents are utilized to expand polyolefin compositions which have been modified by the addition of a stability control agent. The composition has a high degree of dimensional stability and exhibits minimal shrinkage during curing and/or aging.Type: GrantFiled: December 24, 1985Date of Patent: September 15, 1987Assignee: The Dow Chemical CompanyInventor: Chung P. Park
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Patent number: 4692381Abstract: Foamable and foamed polyvinlyidene fluoride materials prepared by compounding the PVDF with a suitable nucleating agent of discreet insoluble particles, a blowing agent having an activation temperature above the melting point of the PVDF, and a dispersing aid to provide a substantially homogeneous powdered mixture that is then melt compounded with high shear melt blending means and then extruded and quenched to provide the foamable polyvinylidene fluoride material which can then be extruded as an insulating material on wire at a temperature sufficiently high to activate the blowing agent.Type: GrantFiled: March 9, 1987Date of Patent: September 8, 1987Assignee: Pennwalt CorporationInventor: Roger L. Pecsok
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Patent number: 4683247Abstract: Foamable thermoplastic compositions are described which are based on pre-compounded concentrated blends of an inorganic non-fibrous particulate foaming agent and a carrier polymer. The foamable thermoplastic polymer is selected from among aromatic polycarbonates alone or with acrylonitrile-butadiene-styrene copolymers polyesters, poly(ester-carbonates), and polyetherimides. The foaming agent may optionally be added as part of the concentrate.Type: GrantFiled: December 28, 1984Date of Patent: July 28, 1987Assignee: General Electric CompanyInventors: Richard B. Allen, Roger W. Avakian
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Patent number: 4681715Abstract: A steam expandable alkenyl aromatic polymer composition and methods of preparation are provided. The composition is mixed with a volatile blowing agent containing, as a primary blowing agent, dichlorodifluoromethane and as a secondary blowing agent, a halogenated hydrocarbon, a hydrocarbon, or an aliphatic alcohol containing from 1 to 4 carbon atoms, the secondary blowing agent having a normal atmospherpic boiling point of from about 0.degree. to about 100.degree. C. The composition may be expanded by steam immediately after extrusion foaming or may be expanded after aging of the composition which has been impregnated with volatile blowing agent.Type: GrantFiled: September 20, 1985Date of Patent: July 21, 1987Assignee: The Dow Chemical CompanyInventors: Chung P. Park, Gerald A. Garcia
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Patent number: 4666950Abstract: Thermoplastic resinous foams having improved resistance to oxidation are provided by the incorporation into such foams of a polyvinyl ether of a C.sub.6-30 alcohol.Type: GrantFiled: May 21, 1986Date of Patent: May 19, 1987Assignee: The Dow Chemical CompanyInventor: Robert H. Miller
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Patent number: 4663362Abstract: A crosslinked polyvinyl chloride resin composition comprising:A: a polyvinyl chloride resin,B: at least one copolymer selected from the group consisting of ethylene/acrylic acid copolymers, ethylene/alkyl acrylate copolymers and ethylene/alkyl methacrylate copolymers, andC: a polyolefin resinand having a high expansion ratio, and a foam sheet prepared from the composition.Type: GrantFiled: July 23, 1986Date of Patent: May 5, 1987Assignee: Toray Industries, Inc.Inventors: Mamoru Koebisu, Takeshi Nishioka, Nario Kamijyukkoku, Hirosi Kawano
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Patent number: 4663360Abstract: A steam expandable alkenyl aromatic polymer composition and methods of preparation are provided. The composition is mixed with a volatile blowing agent containing, as a primary blowing agent, dichlorodifluoromethane and as a secondary blowing agent, a halogenated hydrocarbon, a hydrocarbon, or an aliphatic alcohol containing from 1 to 4 carbon atoms, the secondary blowing agent having a normal atmospherpic boiling point of from about 0.degree. to about 100.degree. C. The composition may be expanded by steam immediately after extrusion foaming or may be expanded after aging of the composition which has been impregnated with volatile blowing agent.Type: GrantFiled: December 30, 1985Date of Patent: May 5, 1987Assignee: The Dow Chemical CompanyInventors: Chung P. Park, Gerald A. Garcia
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Patent number: 4663361Abstract: An expandable polyolefin composition and a method of preparation are provided. Isobutane or mixtures of isobutane with other physical blowing agents are utilized to expand polyolefin compositions which have been modified by the addition of a stability control agent. The composition has a high degree of dimensional stability and exhibits minimal shrinkage during curing and/or aging.Type: GrantFiled: March 24, 1986Date of Patent: May 5, 1987Assignee: The Dow Chemical CompanyInventor: Chung P. Park
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Patent number: 4661302Abstract: An expandable alkenyl aromatic polymer composition and methods of preparation are provided. The composition is admixed with a volatile blowing agent and an expansion aid which includes a polyphenylene ether. The composition may be extruded and then expanded by exposure to steam or hot air or may be impregnated with blowing agent and then expanded.Type: GrantFiled: April 7, 1986Date of Patent: April 28, 1987Assignee: The Dow Chemical CompanyInventor: Chung P. Park
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Patent number: 4656074Abstract: Useful resilient extruded closed cell foam compositions are produced by the present invention by forming an extrudable blend comprising a heat activatible chemical blowing agent and a polymer component consisting essentially of chlorinated polyethylene and at least one other thermoplastic polymer. The amount of chlorinated polyethylene is from 0.025 to 0.5 parts per part of the thermoplastic polymer. The blend is extruded at a temperature below the activation temperature of the blowing agent to form an unfoamed thermoplastic sheet, and the sheet is thereafter heated to a temperature sufficient to activate the blowing agent and expand the sheet and produce a non-crosslinked closed cell thermoplastic foam.Type: GrantFiled: April 9, 1985Date of Patent: April 7, 1987Assignee: Collins & Aikman CorporationInventors: Kenneth E. Conley, Thomas E. Stull
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Patent number: 4652588Abstract: A polymer foam made from a blend of a low density ethylenic polymer and styrenic polymer utilizing a volatile blowing agent and a free radical generating compound as a crosslinking agent. The free radical generating compound provides light crosslinking and increases the foamability of the polymer blend.Type: GrantFiled: May 2, 1986Date of Patent: March 24, 1987Assignee: The Dow Chemical CompanyInventor: Chung P. Park
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Patent number: 4652590Abstract: Ethylenic polymer/styrenic polymer blend foams are prepared from blends of (1) an ethylenic polymer resin having a density of from 0.915 to 0.930 g/cm.sup.3 and a melt index of from 0.2 to 2.6 grams/10 minutes and (2) a styrenic polymer resin having a melt flow rate of from 1.4 to 18 grams/10 minutes. Foams having an excellent overall combination of properties are obtained (1) when the density, D, of such foams is in the range of from 10 to 40 kg/m.sup.3 and the 25 percent compressive strength, F, in kg/cm.sup.2 is from 0.013D.sup.1.15 to 0.024D.sup.1.15 and (2) when the ratio, R, of the melt flow rate of the styrenic polymer employed divided by the melt index of the ethylenic polymer employed is from 7 to 90 and the content, Y, of the styrenic polymer in said blend, in parts by weight based upon 100 parts by weight of the ethylenic polymer resin, satisfies the following requirement:10.ltoreq.Y.ltoreq.3.94.7+1.18R-294.1 log (D).Type: GrantFiled: December 14, 1984Date of Patent: March 24, 1987Assignee: The Dow Chemical CompanyInventors: Tsuneo Hoki, Nobuo Miura
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Patent number: 4640933Abstract: An expandable polyolefin composition and a method of preparation are provided. Isobutane or mixtures of isobutane with other physical blowing agents are utilized to expand polyolefin compositions which have been modified by the addition of a stability control agent. The composition has a high degree of dimensional stability and exhibits minimal shrinkage during curing and/or aging.Type: GrantFiled: May 27, 1986Date of Patent: February 3, 1987Assignee: The Dow Chemical CompanyInventor: Chung P. Park
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Patent number: 4632942Abstract: A resin composition for a masterbatch of foaming agent, comprising:(A) 100 parts by weight of a resin component comprising(i) 100 to 20% by weight of a modified resin having an aromatic vinyl monomer unit content of 5 to 70% by weight, the aromatic vinyl monomer unit being obtained by subjecting an ethylene polymer resin or propylene polymer resin and an aromatic vinyl monomer to graft polymerization, and(ii) 0 to 80% by weight of an ethylene polymer resin or propylene polymer resin, and(B) 1 to 50 parts by weight of a chemical foaming agent.Type: GrantFiled: October 19, 1984Date of Patent: December 30, 1986Assignee: Mitsubishi Petrochemical Co., Ltd.Inventors: Ryouichi Ito, Yoshihiro Banno, Tetsuji Kakizaki
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Patent number: 4622347Abstract: A process for producing a polypropylenepolystyrene interpolymer which can be impregnated with a blowing agent and can then be expanded under normal conditions for polystyrene particles to low density, fine cell structure foams. The interpolymer must be viscbroken, lubricated and stress relaxed in order to foam at 100.degree. C. to densities less than 2.0 pcf.Type: GrantFiled: April 7, 1986Date of Patent: November 11, 1986Assignee: Atlantic Richfield CompanyInventor: Kent D. Fudge
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Patent number: 4616055Abstract: A mixture of virgin crumb rubber sized to between 30 mesh and 100 mesh containing less than 5%+100 fines and thermoplastic binder, such as carbon black filled polyethylene containing a coating promoter, such as a citrate salt and lubricant, such as a calcium stearate, is mixed in a vented Banburg mixer heated to at least 350.degree. F. to remove volatiles through vent before extrusion. The mixture is formed into sheet in the nip of a two roll assembly and cooled in air before diced into pellets by a dicer.The pellets are formed into porous pipe by extrusion in a pipe extruder having the feeding, transition and metering zones separately heated to temperatures from 320.degree. F. to 400.degree. F. (T.sub.1, T.sub.2, T.sub.3). The die has a separate jacket receiving heat exchange fluid for heating the die to a temperature from 290.degree. F. to 380.degree. F. to form a porous pipe having more uniformly spaced and sized pores and a smoother inner wall surface.Type: GrantFiled: May 13, 1985Date of Patent: October 7, 1986Assignee: Dasurat Enterprises PTE, Ltd.Inventor: James W. Mason
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Patent number: 4616042Abstract: The low temperature impact strength of foam thermoplastic articles is increased with the addition of polysiloxane-polycarbonate block copolymer.Type: GrantFiled: June 14, 1985Date of Patent: October 7, 1986Assignee: General Electric CompanyInventor: Roger W. Avakian
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Patent number: 4605682Abstract: A polymer foam made from a blend of a low density ethylenic polymer and styrenic polymer utilizing a volatile blowing agent and a free radical generating compound as a crosslinking agent. The free radical generating compound provides light crosslinking and increases the foamability of the polymer blend.Type: GrantFiled: February 4, 1985Date of Patent: August 12, 1986Assignee: The Dow Chemical CompanyInventor: Chung P. Park
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Patent number: 4604426Abstract: Excellently properties, thermoplastic compositions well adapted for conversion by conventional melt-processing extrusion and other ordinary fabrication techniques into very good quality, lightly cross-linked, thermocollapse-resistant, closed-cell plastic foam(s) and the like expanded cellular product(s) are comprised of an intimate mixture of:(A) a sparsely hydroxylated, normally-solid olefin polymer, particularly a linear alkenyl aromatic or polyolefin polymer which is frequently at least substantially a styrene polymer which is generally in copolymeric form with appropriate moieties of comonomers adapted to provide the requisite attached hydroxyl units therein and thereon; and(B) a minor proportion of an inter-reactive, cross-linking polyisocyanate constituent.Type: GrantFiled: October 24, 1983Date of Patent: August 5, 1986Assignee: The Dow Chemical CompanyInventor: Louis C. Rubens
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Patent number: 4598104Abstract: A foam structure having a density of less than about 20 lbs/ft.sup.3. The method of forming the same comprising forming a homogeneous melt blend under pressure of a polymer member selected from the group consisting of polyetherimide resin particles, polycarbonate resin particles, a polymer blend of polyphenylene oxide and polystyrene in particle form imbibed with a blowing agent, followed by extrusion of the same into a lower pressure atmosphere. A composition comprising said particles imbibed with methylene chloride, chloroform, 1,1,2-trichloroethane or mixtures thereof. A method of thermoforming said foam in sheet form.Type: GrantFiled: July 19, 1985Date of Patent: July 1, 1986Assignee: Mobil Oil CompanyInventors: Charles M. Krutchen, Wen-Pao Wu
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Patent number: 4598101Abstract: A polyphenylene oxide/polystyrene polymer blend foam structure having a density of less than about 20 lbs/ft.sup.3. The method of forming said foam comprising combining the polymer blend with a blowing agent member selected from the group consisting of methylene chloride, chloroform, 1,1,2-trichloroethane and mixtures thereof in molten form under pressure and extruding the same into a lower pressure region to form the foam.Type: GrantFiled: July 29, 1985Date of Patent: July 1, 1986Assignee: Mobil Oil CorporationInventors: Charles M. Krutchen, Wen-Pao Wu
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Patent number: 4598098Abstract: A foam structure having a density of less than about 20 lbs/ft.sup.3. The method of forming the same comprising forming a homogeneous melt blend under pressure of a polymer member selected from the group consisting of polyetherimide resin particles, polycarbonate resin particles, a polymer blend of polyphenylene oxide and polystyrene in particle form imbibed with a blowing agent, followed by extrusion of the same into a lower pressure atmosphere. A composition comprising said particles imbibed with methylene chloride, chloroform, 1,1,2-trichloroethane or mixtures thereof. A method of thermoforming said foam in sheet form.Type: GrantFiled: July 19, 1985Date of Patent: July 1, 1986Assignee: Mobil Oil CorporationInventors: Charles M. Krutchen, Wen-Pao Wu
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Patent number: 4598100Abstract: A foam structure having a density of less than about 20 lbs/ft.sup.3. The method of forming the same comprising forming a homogeneous melt blend under pressure of a polymer member selected from the group consisting of polyetherimide resin particles, polycarbonate resin particles, a polymer blend of polyphenylene oxide and polystyrene in particle form imbibed with a blowing agent, followed by extrusion of the same into a lower pressure atmosphere. A composition comprising said particles imbibed with methylene chloride, chloroform, 1,1,2-trichloroethane or mixtures thereof. A method of thermoforming said foam in sheet form.Type: GrantFiled: July 19, 1985Date of Patent: July 1, 1986Assignee: Mobil Oil CorporationInventors: Charles M. Krutchen, Wen-Pao Wu
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Patent number: 4594208Abstract: A foam structure having a density of less than about 20 lbs/ft.sup.3. The method of forming the same comprising forming a homogeneous melt blend under pressure of a polymer member selected from the group consisting of polyetherimide resin particles, polycarbonate resin particles, a polymer blend of polyphenylene oxide and polystyrene in particle form imbibed with a blowing agent, followed by extrusion of the same into a lower pressure atmosphere. A composition comprising said particles imbibed with methylene chloride, chloroform, 1,1,2-trichloroethane or mixtures thereof. A method of thermoforming said foam in sheet form.Type: GrantFiled: June 18, 1984Date of Patent: June 10, 1986Assignee: Mobil Oil CorporationInventors: Charles M. Krutchen, Wen-Pao Wu
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Patent number: 4590221Abstract: A method for producing foam polyolefin products which are light-stable and weather-resistant are obtained by the combined use of the following stabilizers:(a) phenolic antioxidants,(b) substituted benzophenones and/or substituted benzotriazoles, and(c) sterically hindered amines.Type: GrantFiled: November 28, 1984Date of Patent: May 20, 1986Assignee: Dynamit Nobel AGInventors: Werner Kuhnel, Paul Spielau
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Patent number: 4587271Abstract: A foam structure having a density of less than about 20 lbs/ft.sup.3. The method of forming the same comprising forming a homogeneous melt blend under pressure of a polymer member selected from the group consisting of polyetherimide resin particles, polycarbonate resin particles, a polymer blend of polyphenylene oxide and polystyrene in particle form imbibed with a blowing agent, followed by extrusion of the same into a lower pressure atmosphere. A composition comprising said particles imbibed with methylene chloride, chloroform, 1,1,2-trichloroethane or mixtures thereof. A method of thermoforming said foam in sheet form.Type: GrantFiled: June 18, 1984Date of Patent: May 6, 1986Assignee: Mobil Oil CorporationInventors: Charles M. Krutchen, Wen-Pao Wu
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Patent number: 4581383Abstract: An expandable blend of a linear olefinic polymer and a crosslinkable polymer for production of lightly crosslinked foamed polymers and a process for the preparation thereof is provided. The presence of a crosslinkable polymer component in the blend increases the melt strength of the linear olefinic component so that conventional melt processing techniques may be utilized to produce foamed polymers. Both open and closed cell foams may be produced.Type: GrantFiled: September 6, 1985Date of Patent: April 8, 1986Assignee: The Dow Chemical CompanyInventor: Chung P. Park
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Patent number: 4579873Abstract: A foam structure having a density of less than about 20 lbs/ft.sup.3. The method of forming the same comprising forming a homogeneous melt blend under pressure of a polymer member selected from the group consisting of polyetherimide resin particles, polycarbonate resin particles, a polymer blend of polyphenylene oxide and polystyrene in particle form imbibed with a blowing agent, followed by extrusion of the same into a lower pressure atmosphere. A composition comprising said particles imbided with methylene chloride, chloroform, 1,1,2-trichloroethane or mixtures thereof. A method of thermoforming said foam in sheet form.Type: GrantFiled: July 19, 1985Date of Patent: April 1, 1986Assignee: Mobil Oil CorporationInventors: Charles M. Krutchen, Wen-Pao Wu
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Patent number: 4579710Abstract: A foam structure having a density of less than about 20 lbs/ft.sup.3. The method of forming the same comprising forming a homogeneous melt blend under pressure of a polymer member selected from the group consisting of polyetherimide resin particles, polycarbonate resin particles, a polymer blend of polyphenylene oxide and polystyrene in particle form imbibed with a blowing agent, followed by extrusion of the same into a lower pressure atmosphere. A composition comprising said particles imbibed with methylene chloride, chloroform, 1,1,2-trichloroethane or mixtures thereof. A method of thermoforming said foam in sheet form.Type: GrantFiled: July 19, 1985Date of Patent: April 1, 1986Assignee: Mobil Oil CorporationInventors: Charles M. Krutchen, Wen-Pao Wu
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Patent number: 4579878Abstract: A foam structure having a density of less than about 20 lbs/ft.sup.3. The method of forming the same comprising forming a homogeneous melt blend under pressure of a polymer member selected from the group consisting of polyetherimide resin particles, polycarbonate resin particles, a polymer blend of polyphenylene oxide and polystyrene in particle form imbibed with a blowing agent, followed by extrusion of the same into a lower pressure atmosphere. A composition comprising said particles imbibed with methylene chloride, chloroform, 1,1,2-trichloroethane or mixtures thereof. A method of thermoforming said foam in sheet form.Type: GrantFiled: November 9, 1984Date of Patent: April 1, 1986Assignee: Mobil Oil CompanyInventors: Charles M. Krutchen, Wen-Pao Wu
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Patent number: 4569950Abstract: A novel foam composed of closed cells having a specific tensile strength of 150 kg/cm.sup.2 or more, a compression recovery of 80% or more and a heat shrinkage of 50% or less, a variation in thickness of foam of less than 50%, a corrugation value of less than 100% and a surface smoothness of less than 2 mm, an average cell diameter of 0.05-3 mm, said foam having a foam density of 0.007-0.10 g/cm.sup.3, a variation in thickness of cell wall film of .+-.30% or less and a variation factor of cell diameter of 70% or less, obtained by foaming a composition consisting essentially of 100 parts by weight of a substantially non-crosslinked polyethylene having a density of 0.935 g/cm.sup.3 or more and a melting point of 117.degree. C. or more, 0.05-10 parts by weight of a foaming decelerant having the capability of prolonging the foaming time by at least one second as compared with the absence of the foaming decelerant, as measured by a glass tube blowing test method, and 0.001-5 parts by weight of a nucleating agent.Type: GrantFiled: April 10, 1985Date of Patent: February 11, 1986Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Kouroku Hoshi, Shoji Noro
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Patent number: 4567209Abstract: Novel foamed thermoplastic resins are disclosed. The foam includes an ionically associated blend containing at least about 60 weight % of a metal salt of a styrene-acrylic acid copolymer and at least 1 weight % of a metal salt of an ethylene-acrylic acid copolymer. The foams typically are prepared by extruding a ternary mixture of a styrene-acrylic acid copolymer, an ethylene-acrylic copolymer and an alkali metal bicarbonate which functions as the foaming agent. The ionically associated blends included in the foam are believed to be novel compositions of matter.Type: GrantFiled: September 24, 1984Date of Patent: January 28, 1986Assignee: The Dow Chemical CompanyInventor: Chung P. Park
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Patent number: 4554293Abstract: An expandable blend of a linear olefinic polymer and a crosslinkable polymer for production of lightly crosslinked foamed polymers and a process for the preparation thereof is provided. The presence of a crosslinkable polymer component in the blend increases the melt strength of the linear olefinic component so that conventional melt processing techniques may be utilized to produce foamed polymers. Both open and closed cell foams may be produced.Type: GrantFiled: April 19, 1985Date of Patent: November 19, 1985Assignee: The Dow Chemical CompanyInventor: Chung P. Park
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Patent number: 4535100Abstract: A foam structure having a density of less than about 20 lbs/ft.sup.3. The method of forming the same comprising forming a homogeneous melt blend under pressure of a polymer member selected from the group consisting of polyetherimide resin particles, polycarbonate resin particles, a polymer blend of polyphenylene oxide and polystyrene in particle form imbibed with a blowing agent, followed by extrusion of the same into a lower pressure atmosphere. A composition comprising said particles imbibed with methylene chloride, chloroform, 1,1,2-trichloroethane or mixtures thereof. A method of thermoforming said foam in sheet form.Type: GrantFiled: December 12, 1983Date of Patent: August 13, 1985Assignee: Mobil Oil CorporationInventors: Charles M. Krutchen, Wen-Pao Wu
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Patent number: 4525487Abstract: A spray method for making cured polyester resin foam is provided using a liquid unsaturated polyester resin, a sulfonyl hydrazide, an effective amount of a promoter, an effective amountof a catalyst and 0.005-3 parts quaternary ammonium salt.Type: GrantFiled: August 11, 1983Date of Patent: June 25, 1985Assignee: Uniroyal, Inc.Inventors: James Ahnemiller, Warren J. Peascoe
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Patent number: 4522954Abstract: A method for producing low density polyester foam includes heating the resin to a temperature in the range of from 80.degree. to 140.degree. F., combining the resin with a blowing agent such as a sulfonyl hydrazide, combining the resulting admixture with a catalyst, and depositing the catalyzed resin on a surface. The density of the resulting foam can be decreased by incorporating a flourinated hydrocarbon into the resin.Type: GrantFiled: March 14, 1984Date of Patent: June 11, 1985Inventor: Frank Ive
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Patent number: 4520137Abstract: A one-part activator and blowing agent system for foaming plastics comprising an alkali metal borohydride and a salt hydrate blended in a single pellet or as separate pellets with a dry inert resinous polymer carrier. The one-part system is blended with a resinous polymer and then the blend extruded at a temperature at which the blend becomes molten such that the salt hydrate releases its water of hydration to hydrolyze the borohydride and produce a cellular article.Type: GrantFiled: October 18, 1984Date of Patent: May 28, 1985Assignee: Morton Thiokol Inc.Inventors: Roger G. Hamel, Susan B. Poulin
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Patent number: 4517316Abstract: A mixture of crumb rubber, binder, such as polyethylene, and slip contact agent, such as talc, and lubricant, such as a metal stearate, is formed in a blender (10), is shaped into pellets (32) by extruding a strand of the mixture (26) into water (28) and breaking the strand into pellets. The pellets (32) are adjusted to a preselected water content in drier (46) before storage in closed bags (50), stored and reinforced in a container (54).The controlled water content pellets (32) are formed into porous pipe (88) by extrusion in pipe extruder (62) having the feeding, transition and metering zones separately heated to temperatures from 320.degree. F. to 400.degree. F. (T.sub.1, T.sub.2, T.sub.3). The die has a separate jacket (90) receiving heat exchange fluid for heating the die (68) to a temperature from 290.degree. F. to 380.degree. F. to form a porous pipe (88) having more uniform porosity. Porosity is controlled by selecting water content of the pellets and controlling die temperature.Type: GrantFiled: January 24, 1984Date of Patent: May 14, 1985Assignee: Dasurat Enterprises PTE Ltd.Inventor: James W. Mason
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Patent number: 4515907Abstract: An improved foamable vinyl aromatic polymer composition and a process for preparing a vinyl aromatic polymer foam having incorporated therein a blend of alpha-olefin polymers are disclosed. The blend of alpha-olefin polymers may be virgin material or a portion of recycle feedstream, the recycle feedstream being prepared from adhesive film faced extruded vinyl aromatic foam laminate scrap. Foam materials having improved solvent resistance, ultraviolet light stability, and adhesive characteristics are prepared from the composition and process.Type: GrantFiled: March 16, 1984Date of Patent: May 7, 1985Assignee: The Dow Chemical CompanyInventors: Thomas W. McCullough, Bradley D. Stevens
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Patent number: 4507405Abstract: A composition for forming a molded article having the external appearance resembling that of natural cork which comprises, a thermoplastic resinous material as the major ingredient thereof, a caramel colorant which is present in an amount sufficient to impart to the thermoplastic resinous material the color of natural cork, and a blowing agent, said thermoplastic resinous material being compatible with the caramel colorant and having a processing temperature which is not so high as to degrade the caramel colorant during the molding operation.Type: GrantFiled: June 17, 1982Date of Patent: March 26, 1985Assignee: The Coca-Cola CompanyInventors: Gary V. Paisley, Alex Malaspina
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Patent number: 4501825Abstract: A novel tire sealant and inflator composition comprising a resin, a latex sealant, alkylene glycol, fibers, an alkanolamine, a foaming agent, and water. The composition is packaged in aerosol cans with a chlorofluorocarbon propellant/inflator and used to seal and inflate punctured tires. The composition is applied to the punctured tire through the valve stem, and acts to seal the puncture and inflate the tire sufficiently to support the weight of the car.Type: GrantFiled: June 28, 1984Date of Patent: February 26, 1985Assignee: Pennzoil CompanyInventors: Arpad M. Magyar, Gerald G. Smith
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Patent number: 4501711Abstract: Process and composition for single step production of foam by utilizing a blowing agent, organic peroxide cross linking agent and a silicone block copolymer.Type: GrantFiled: May 15, 1984Date of Patent: February 26, 1985Assignee: Union Carbide CorporationInventors: Akitaka Senuma, Yoshihiko Shimizu, Kiroku Tsukada
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Patent number: 4499210Abstract: A composition suitable for open-cell polyolefin foam which comprises 100 parts by weight of olefin resin, 1 to 20 parts by weight of blowing agent, 0.3 to 10 parts by weight of organic peroxide crosslinking agent, 0.1 to 10 parts by weight of trifunctional monomer, and 1 to 5 parts by weight of silicone oil or a derivative thereof.Type: GrantFiled: December 15, 1983Date of Patent: February 12, 1985Assignee: Union Carbide CorporationInventors: Akitaka Senuma, Takao Aizawa