Physical Aftertreatment Of A Cellular Product Patents (Class 521/918)
  • Patent number: 4594362
    Abstract: A dry-type textile cleaning article is disclosed which comprises a friable hydrophilic polyurethane foam body which incorporates abrasive particles, solvents, surfactants, and adjuvants such as fragrance, biocides, and fiber emollients. When rubbed over a textile surface the foam body yields shreds which are effective to remove both liquid and dry soils from textiles.
    Type: Grant
    Filed: October 31, 1985
    Date of Patent: June 10, 1986
    Assignee: Creative Products Resource Associates, Ltd.
    Inventors: James A. Smith, Betty J. Murphy
  • Patent number: 4594208
    Abstract: 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: Grant
    Filed: June 18, 1984
    Date of Patent: June 10, 1986
    Assignee: Mobil Oil Corporation
    Inventors: Charles M. Krutchen, Wen-Pao Wu
  • Patent number: 4587271
    Abstract: 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: Grant
    Filed: June 18, 1984
    Date of Patent: May 6, 1986
    Assignee: Mobil Oil Corporation
    Inventors: Charles M. Krutchen, Wen-Pao Wu
  • Patent number: 4585605
    Abstract: The foam of the present invention, which has a multi-cellular structure including many wrinkles having one end in the boundary portion where at least three cells are adjacent to one another and extending toward the central portion of the cell wall, is a rigid thermoplastic resin foam having an ultra-low density, a high sound-insulating property, a high heat-insulating property and a high flexibility, and it is suitable for adaption for building construction. The process of the present invention is to provide the aforesaid foam of the present invention by subjecting the foam of a rigid thermoplastic resin to expansion, contraction and aging.
    Type: Grant
    Filed: September 25, 1985
    Date of Patent: April 29, 1986
    Assignee: Dow Chemical Company
    Inventors: Takao Kadota, Masayuki Hashimoto, Itsuo Hamada
  • Patent number: 4581385
    Abstract: A dry-type carpet cleaning composition is disclosed which comprises shreds of a hydrophilic polyurethane foam which incorporates abrasive particles surfactants, and adjuvants such as fragrance, solvents, anti-static agents and fiber emollients. The foam shreds are effective to clean both wet and dry carpeting since they are highly water-absorbent and can be readily removed from the carpet surface when wet.
    Type: Grant
    Filed: December 20, 1984
    Date of Patent: April 8, 1986
    Inventors: James A. Smith, Betty J. Murphy
  • Patent number: 4579878
    Abstract: 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: Grant
    Filed: November 9, 1984
    Date of Patent: April 1, 1986
    Assignee: Mobil Oil Company
    Inventors: Charles M. Krutchen, Wen-Pao Wu
  • Patent number: 4569861
    Abstract: A composite cleaning pad is provided which incorporates a sheet of open-celled reticulated, hydrophillic polyurethane foam which integrally incorporates silane-coupled abrasives and a gelled aqueous phase and a textile sheet which covers a surface of the foam sheet and is bonded thereto.
    Type: Grant
    Filed: June 18, 1984
    Date of Patent: February 11, 1986
    Assignee: Creative Products Resource Associates, Ltd.
    Inventors: James A. Smith, Betty J. Murphy
  • Patent number: 4563483
    Abstract: A water and oil absorbant concrete cleaning composition is disclosed comprising shreds of a hydrophilic, open-celled, solids-loaded polyurethane foam. Methods are also disclosed to bind the solids to the cellular foam matrix.
    Type: Grant
    Filed: July 6, 1983
    Date of Patent: January 7, 1986
    Assignee: Creative Products Resource Ltd.
    Inventors: James A. Smith, Betty J. Murphy
  • Patent number: 4552904
    Abstract: The foam of the present invention, which has a multi-cellular structure including many wrinkles having one end in the boundary portion where at least three cells are adjacent to one another and extending toward the central portion of the cell wall, is a rigid thermoplastic resin foam having an ultra-low density, a high sound-insulating property, a high heat-insulating property and a high flexibility, and it is suitable for adaption for building construction. The process of the present invention is to provide the aforesaid foam of the present invention by subjecting the foam of a rigid thermoplastic resin to expansion, contraction and aging.
    Type: Grant
    Filed: March 19, 1985
    Date of Patent: November 12, 1985
    Assignee: The Dow Chemical Company
    Inventors: Takao Kadota, Masayuki Hashimoto, Itsuo Hamada
  • Patent number: 4551481
    Abstract: An absorbent floor cleaning composition is disclosed comprising shreds of a hydrophilic, open-celled, solids-loaded polyurethane foam having an aqueous phase releasably absorbed therein. The composition is particularly effective to clean flooring fouled with oily or greasy soils.
    Type: Grant
    Filed: March 28, 1985
    Date of Patent: November 5, 1985
    Assignee: Creative Products Resource Associates, Ltd.
    Inventors: James A. Smith, Betty J. Murphy
  • Patent number: 4548954
    Abstract: An absorbent floor cleaning composition is disclosed comprising shreds of a hydrophilic, open-celled, solids-loaded polyurethane foam having an aqueous phase releasably absorbed therein. The composition is particularly effective to clean flooring fouled with oily or greasy soils.
    Type: Grant
    Filed: December 20, 1984
    Date of Patent: October 22, 1985
    Assignee: Creative Products Resource Associates, Ltd.
    Inventors: James A. Smith, Betty J. Murphy
  • Patent number: 4543367
    Abstract: Described is a process for preparing extruded functional fluid and solid-containing thermoplastic foamed particles using chemical blowing agents or direct gas extrusion processes, uses of such foamed particles and articles produced from said foamed particles. The process described involves the use of a single screw or double screw extruder wherein the resin particles are added upstream from the functional fluid or solid which, in turn, is added to the extruder upstream from the point of addition of the liquid or gaseous blowing agent.
    Type: Grant
    Filed: August 24, 1984
    Date of Patent: September 24, 1985
    Assignee: International Flavors & Fragrances Inc.
    Inventors: Howard J. Rutherford, Donald A. Withycombe
  • Patent number: 4537914
    Abstract: An absorbent floor cleaning and waxing composition is disclosed comprising shreds of a hydrophilic, open-celled, solids-loaded polyurethane foam having an aqueous wax emulsion releasably incorporated therein. The composition is effective to replace soiled coatings of floor wax with fresh floor wax.
    Type: Grant
    Filed: January 4, 1985
    Date of Patent: August 27, 1985
    Assignee: Creative Products Resource Associates, Ltd.
    Inventors: James A. Smith, Betty J. Murphy
  • Patent number: 4537912
    Abstract: A process for the rapid post curing of polyether polyurethane foam in the form of porous blocks in which the foam is subjected to a mixture of water vapor and gaseous ammonia, primary or secondary amines at a temperature of about 50.degree. to 150.degree. F. for a period of 1 or more minutes. The cured foam recovers its original dimensions when distorted or compressed after the distortion or compression force is released.
    Type: Grant
    Filed: September 5, 1984
    Date of Patent: August 27, 1985
    Assignee: Reeves Brothers, Inc.
    Inventor: Azel A. Griswold
  • Patent number: 4535100
    Abstract: 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: Grant
    Filed: December 12, 1983
    Date of Patent: August 13, 1985
    Assignee: Mobil Oil Corporation
    Inventors: Charles M. Krutchen, Wen-Pao Wu
  • Patent number: 4525386
    Abstract: A technique for enhancing the mechanical, thermal or other properties of an open-cell synthetic plastic foam body by injecting filler particles into the cells thereof. The filler particles, which may take the form of micro-spheres of glass, metal powers or other additives, depending on the property to be enhanced, are fed into a pressurized stream of air which is projected at high velocity to fluidize the particles. The stream is directed toward the surface of the body to cause the particles carried thereby to impregnate the cells.
    Type: Grant
    Filed: November 8, 1984
    Date of Patent: June 25, 1985
    Inventor: Morey Weisman
  • Patent number: 4482582
    Abstract: A modified low-density flexible polyurethane foam product having a relatively high degree of firmness as well as commercially acceptable dielectric heat sealing characteristics. The product formulation includes an intermediate constituted by a mixture of polyol and a polymer/polyol in a ratio imparting to the product a predetermined degree of firmness, and a thermoplastic additive whose dielectric loss index is greater than the loss index of polyurethane foam to impart to the product an acceptable dielectric heating response in a high frequency electric field. This response is enhanced by acrylonitrile/styrene components included in the polymer/polyol.
    Type: Grant
    Filed: March 23, 1984
    Date of Patent: November 13, 1984
    Inventor: Morey Weisman
  • Patent number: 4466933
    Abstract: There are provided methods for making heat-resistant, foamed, crystalline plastic materials. For example, polyethylene terephthalate may be foamed with a polycarbonate, extruded into a foamed sheet and this foamed sheet may be thermoformed by being subjected to crystallization annealing. The thermoformed, foamed, crystalline plastic sheets prepared by this process are particularly useful for forming light weight, ovenable food containers.
    Type: Grant
    Filed: January 4, 1984
    Date of Patent: August 21, 1984
    Assignee: Mobil Oil Corporation
    Inventor: Mark T. Huggard
  • Patent number: 4429061
    Abstract: High performance foams comprised of thermotropic liquid crystal polymers are provided. The lightweight rigid foams exhibit a combination of excellent properties including enhanced mechanical properties such as high strength to weight ratio, high flame and thermal stability, and excellent solvent resistance. The foams fabricated from such polymers have significantly reduced anisotropy compared to unfoamed polymers. The transverse mechanical properties are enhanced by foaming relative to the percentage density reduction due to the foaming. The physical properties of the foams are further enhanced by heat treatment as the core of foams of thermotropic liquid crystal polymers consists of highly oriented cell walls which can exhibit greater enhancement upon heat treatment than is exhibited by the core of the unfoamed polymer.
    Type: Grant
    Filed: November 15, 1982
    Date of Patent: January 31, 1984
    Assignee: Celanese Corporation
    Inventor: Yoshiaki Ide
  • Patent number: 4429060
    Abstract: High performance foams comprised of certain thermotropic liquid crystal polymers are provided. Such thermotropic liquid crystal polymers comprise not less than about 10 mole percent of recurring 6-oxy-2-naphthoyl moieties. The lightweight rigid foams exhibit a combination of excellent properties including enhanced mechanical properties such as high strength to weight ratio, high flame and thermal stability, and excellent solvent resistance. The foams fabricated from such polymers have significantly reduced anisotropy compared to unfoamed articles of the same polymers.
    Type: Grant
    Filed: November 15, 1982
    Date of Patent: January 31, 1984
    Assignee: Celanese Corporation
    Inventor: Yoshiaki Ide
  • Patent number: 4427157
    Abstract: Disclosed is the preparation of micro-bits of expanded styrene-polymers and of expanded polyolefins by comminuting the styrene-polymer or polyolefin in a particular combination of comminuting steps in a suitable comminutor that can provide that combination of steps and in the presence of water as a cooling agent. The polymer micro-bits, which are produced as an aqueous slurry, may be rendered dry-to-the-touch by vacuum filtration followed by passage through a filter press.
    Type: Grant
    Filed: May 19, 1980
    Date of Patent: January 24, 1984
    Inventor: Max Klein
  • Patent number: 4394457
    Abstract: A porous composite material includes a porous body formed of a hydrophobic polymer such as polyvinyl chloride and a layer of a hydrophilic polymer such as polyvinyl alcohol provided over at least a portion of the interior surface of each of the pores of the porous body. The composite material is obtained by a process including the steps of dispersing an aqueous solution containing a hydrophilic polymer and a foaming agent into a solution of a hydrophobic polymer in an organic solvent to form an emulsion, removing the water and the organic solvent from the emulsion to obtain a solid, and subjecting the solid to foaming conditions.
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: July 19, 1983
    Assignee: Agency of Industrial Science & Technology
    Inventor: Tatsuo Ogasa
  • Patent number: 4352894
    Abstract: This invention relates to solutions of silanols prepared by hydrolysis of alkyltrialkoxysilanes whose alkoxy groups are partially or completely hydrolyzed.Preferred hydrolyzed alkyltrialkoxysilanes are of the formula CH.sub.3 --CH.sub.2 --CH.sub.2 --Si(OH).sub.n (OH').sub.3-n.
    Type: Grant
    Filed: September 22, 1981
    Date of Patent: October 5, 1982
    Assignee: Dynamit Nobel
    Inventor: Werner Schmidt
  • Patent number: 4352893
    Abstract: Polymer foam is extruded as a tube or sheet into a cooling liquid which is maintained at a temperature up to about 85.degree. C. Either one or both surfaces of the polymer are cooled as the extrudate emerging from the die orifice passes through the liquid. Styrenic polymer foam extrudate produced by such a method exhibits excellent puncture resistance and tensile properties.
    Type: Grant
    Filed: July 14, 1980
    Date of Patent: October 5, 1982
    Assignee: Mobil Oil Corporation
    Inventors: D. Emil Johnson, G. Vincent Sharps, Jr.
  • Patent number: 4328368
    Abstract: A method if provided for continuously hydrolyzing urethane foam in a vertically oriented hydrolysis reactor. In a preferred practice, a bed of foam particles is formed in the reactor. Superheated steam is flowed continuously upward through the bed at a temperature and rate such that only the foam particles then adjacent the bottom of the reactor are hydrolyzed and the bulk of the bed is not fluidized. Unreacted steam heats the unhydrolyzed foam. Liquid hydrolysis products are drained as they are formed to prevent hydrolysis-impeding liquid saturation of unhydrolyzed particles.
    Type: Grant
    Filed: May 5, 1980
    Date of Patent: May 4, 1982
    Assignee: General Motors Corporation
    Inventors: Robert J. Salloum, Clifford C. Duff
  • Patent number: 4328549
    Abstract: An improved method for automatically controlling the rate of mass flow in a system having a mass mover powered by a power supply which is attenuated by a control device for transferring mass through a conduit, wherein a signal proportional to said mass flow is transmitted to an automatic control unit, characterized by the improvement among others, whereby the improved automatic control unit is provided with a process control mode in which new operating conditions are entered into the program, and the automatic control unit determines the correct mode of control for the new process conditions.
    Type: Grant
    Filed: January 11, 1980
    Date of Patent: May 4, 1982
    Assignee: Olin Corporation
    Inventor: Cecil T. Avery
  • Patent number: 4307201
    Abstract: A method for preparing macroporous aminotriazine-aldehyde resins by reaction in the presence of an acid catalyst and a miscible porogen. The resin product has high surface area and porosity and displays excellent sorption capacity.
    Type: Grant
    Filed: June 18, 1980
    Date of Patent: December 22, 1981
    Assignee: Diamond Shamrock Corporation
    Inventors: Richard Won, Robert P. Zajac
  • Patent number: 4304810
    Abstract: Low density, lightweight foam articles may be provided with certain portions or regions thereof, that are reinforced, having higher density and strength, obtained by compression of the foam in these locations, during or after formation of the foam. Such locations may be made sufficiently strong and dense to allow the article to be attached in place by fastening means, imbedded therein. The increase in density can be as much as from 5 pcf to 10 pcf or higher, depending upon the particular application.Many foam materials, capable of being molded, extruded, or otherwise shaped to a predetermined configuration, may be made with this combination of high and low density, including foams of styrenic polymer or copolymer compositions, urethanes, vinyls, and even non-thermoplastic based materials, such as phenolic foams.
    Type: Grant
    Filed: July 17, 1980
    Date of Patent: December 8, 1981
    Assignee: Arco Polymers, Inc.
    Inventors: Richard L. Gates, Dennis J. Fuller, Thomas L. Wolford
  • Patent number: 4304872
    Abstract: A novel flexible polyurethane foam has a substantial number of cells with an internal residual cell surface greater than 60% and less than 90%. The novel foams have improved vibration damping characteristics.
    Type: Grant
    Filed: April 24, 1980
    Date of Patent: December 8, 1981
    Assignee: BP Chemicals Limited
    Inventor: Rudolf J. Tenhagen
  • Patent number: 4304873
    Abstract: The preparation of flexible polyurethane foam micro-bits by the comminution of a flexible polyurethane foam in the presence of a compatible protective cooling fluid under specific comminuting steps and conditions.
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: December 8, 1981
    Inventor: Max Klein
  • Patent number: 4299883
    Abstract: A sound-absorbent material is made by compressing foamed synthetic plastics material so as to rupture the walls of at least some of the cells therein. Preferably a slab of polycarbodiimide foam is compressed to about 50% to 66% of its initial thickness while cold or at a temperature below 120.degree. C., and is moulded to shape while below 120.degree. C., being bonded if desired to one or more sheets of covering or strengthening or decorative fabric or felt or other facing material.
    Type: Grant
    Filed: October 16, 1979
    Date of Patent: November 10, 1981
    Inventors: Jacques Roth, Paul Seiler
  • Patent number: 4281197
    Abstract: Porous polyurethane solids such as open cell polyurethane foams are rapidly heated and hydrolytically decomposed into separate polyol component and diamine component by contacting the porous solids with saturated steam in a heated vacuum chamber. Separation of high quality liquid polyol and diamine is achieved.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: July 28, 1981
    Assignee: Ford Motor Company
    Inventor: Fred G. Oblinger
  • Patent number: 4276385
    Abstract: Cold-cured molded polyurethane flexible foams having improved vibration damping properities are made by foaming in the presence of (1) a high molecular weight predominantly linear siloxane polyoxyalkylene block copolymer and (2) a solvent which is compatible with the block copolymer and which has a viscosity of 3 to 100 cps and a surface tension between 15 to 60 dynes/cm.
    Type: Grant
    Filed: April 18, 1980
    Date of Patent: June 30, 1981
    Assignee: BP Chemicals Limited
    Inventor: Rudolf J. Tenhagen
  • Patent number: 4273886
    Abstract: Polyimide foams derived from mixtures of aromatic diamines and partial esters of a benzophenonetetracarboxylic acid. The precursors are converted into polyimide foams by the application of heat; and the foams are then compressed, yielding dense, rigid, and structurally strong, intumescent materials.
    Type: Grant
    Filed: February 15, 1980
    Date of Patent: June 16, 1981
    Assignee: International Harvester Company
    Inventor: John Gagliani
  • Patent number: 4272618
    Abstract: The invention is a reaction injection molded polyurethane of improved properties comprising the cured reaction product of a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate. The reaction product is cured by subjecting it to an ambient temperature of from about 290.degree.-425.degree. F. for a time sufficient to achieve an improvement in properties. The invention is also a method for making such polyurethanes.
    Type: Grant
    Filed: April 30, 1979
    Date of Patent: June 9, 1981
    Assignee: Texaco Development Corp.
    Inventors: Richard J. G. Dominguez, Doris M. Rice
  • Patent number: 4241193
    Abstract: Polyimide foams derived from mixtures of aromatic diamines and partial esters of a benzophenonetetracarboxylic acid. The precursors are converted into polyimide foams by the application of heat; and the foams are then compressed, yielding dense, rigid, and structurally strong, intumescent materials.
    Type: Grant
    Filed: August 21, 1978
    Date of Patent: December 23, 1980
    Assignee: International Harvester Company
    Inventor: John Gagliani
  • Patent number: 4241189
    Abstract: A wear-resistant flexible sheet material, suitable for use as outer soles on footwear, is produced by pressing reconstituted polyurethane foam sheets in the substantial absence of air at temperatures above 150.degree. C. The sheets should have a density exceeding 15 lb/ft.sup.3 and are further densified by the hot pressing. The sheets are preferably pre-heated to 175.degree.-210.degree. C. and pressed under a pressure of 5 to 30 tons/ft.sup.2 for periods of up to 5 minutes. The sheets may be embossed or smooth surfaced and may contain pigments, plasticizers and other additives.
    Type: Grant
    Filed: February 2, 1978
    Date of Patent: December 23, 1980
    Assignee: General Foam Products Limited
    Inventors: Neville M. Sheldon, Alfred Stern
  • Patent number: 4241114
    Abstract: Polyimide foams derived from mixtures of aromatic diamines and partial esters of a benzophenonetetracarboxylic acid. The precursors are converted into polyimide foams by the application of heat; and the foams are then compressed, yielding dense, rigid, and structurally strong, intumescent materials.
    Type: Grant
    Filed: February 15, 1980
    Date of Patent: December 23, 1980
    Assignee: International Harvester Company
    Inventor: John Gagliani
  • Patent number: 4230566
    Abstract: A granular polyurethane cellular medium for absorbing water-borne, water insoluble hydrocarbons, method for its preparation and production system. The granular medium is formed by prereacting polyisocyanate or a prepolymer with a linear monohydric alcohol to form a prepolymer. This prepolymer subsequently is reacted with a polyol and blowing agent within a flexible sheet bun mold. Following molding of the bun within the flexible sheet, the bun is transferred to a comminution stage within a predetermined time period whereupon it is granulated. The material is fabricable at low cost and under a broad range of environmental conditions permitting flexibility in selecting the site for production of the material. The material exhibits an unusually high affinity for the water-borne contaminant hydrocarbons, does not absorb water and lends itself to low-cost production procedures.
    Type: Grant
    Filed: June 28, 1978
    Date of Patent: October 28, 1980
    Assignee: Petrozorbent Corporation
    Inventor: Thomas L. Faudree, III
  • Patent number: 4226942
    Abstract: This invention relates to an improved process for the production of a particulate foamable polyvinyl aromatic resin of the type wherein a vinyl aromatic monomer is polymerized in an aqueous suspension system to produce beads of thermoplastic polyvinyl aromatic resin, separating the beads and incorporating a volatile liquid blowing agent in the separated beads at a temperature above the resin softening point under such conditions that foamable resin particles are produced, cooling said beads followed by separating and drying said beads, the improvement comprising: drying said beads under vacuum conditions at normal temperatures, removing residual water from said beads while retaining said blowing agent in said beads. Also included in the invention are foamable particles when produced by the above process and foamed articles made from the foamable particles.
    Type: Grant
    Filed: August 15, 1978
    Date of Patent: October 7, 1980
    Assignee: Monsanto Company
    Inventor: Nan Wei
  • Patent number: 4207378
    Abstract: Involved are (I) expanded, thermoplastic, non-brittle as expanded polymers selected from a styrene-polymer and a polyolefin from polyethylene to poly-methylpentene, said expanded polymer being in form of micro-bits which (a) are from about 40 to about 325 microns long and from about 20 to about 325 microns wide, (b) are substantially completely to entirely completely free (i) of intact cells of expanded polymer bit-pieces from which they were produced and of (ii) any uniformity in outline of individual micro-bit particles, and (c) in density are from about 85 percent of, to about substantially the same as, the specific unexpanded polymer from which there was provided the aforesaid expanded polymer, and (II) a method of preparing these micro-bits by impelling a mixture of them in water in a confined comminuting zone through a circular path by repeated impact by a plurality of impact surfaces spaced axially and radially at apart from one another and rotated about the circular path's axis from about 4700 to abou
    Type: Grant
    Filed: September 15, 1977
    Date of Patent: June 10, 1980
    Inventor: Max Klein
  • Patent number: 4205137
    Abstract: Basic material for making a porous material for seals comprising powder produced by pulverizing a plastic foams selected from the group consisting of gelated foams and semi-gelated foam of polyvinyl chloride.
    Type: Grant
    Filed: August 1, 1977
    Date of Patent: May 27, 1980
    Assignee: Bando Chemical Industries, Ltd.
    Inventor: Osamu Akiyama
  • Patent number: 4201818
    Abstract: A flexible and foldable foam plastic sheet and a process for making same, said process comprising initially compressing the foam sheet between two surfaces at least one of which is a textured surface (e.g., screen like) to reduce the sheet in thickness and reduce or destroy the resilience of the foam, and then, when further reduction in thickness of the resulting sheet is desired, pressing the resulting compressed sheet between two substantially smooth surfaces to achieve such desired further reduction in thickness. Mechanical properties of the foam sheet so processed are desirably increased, thereby producing a foam sheet product suitable as a replacement for paper in many applications.
    Type: Grant
    Filed: May 30, 1978
    Date of Patent: May 6, 1980
    Assignee: Mobil Oil Corporation
    Inventor: Charles L. Rohn
  • Patent number: 4200679
    Abstract: A polyurethane structure prepared by the comminution of a flexible polyurethane foam in the presence of a compatible protective cooling fluid.
    Type: Grant
    Filed: September 15, 1977
    Date of Patent: April 29, 1980
    Inventor: Max Klein
  • Patent number: 4198792
    Abstract: New chromatographic materials have been developed to serve as the stationary phase of columns used in the separation of atmospheric gases. These materials consist of a crosslinked porous polymer matrix, e.g., a divinylbenzene polymer, into which has been embedded an inorganic complexed ion such as N,N'-ethylene-bis(acetylacetoniminato)-cobalt (II). Organic nitrogenous bases, such as pyridine, may be incorporated into the chelate polymer complexes to increase their chromatographic utility. With such materials, the process of gas chromatography is greatly simplified, especially in terms of time and quantity of material needed for a gas separation.
    Type: Grant
    Filed: June 30, 1978
    Date of Patent: April 22, 1980
    Inventors: Robert A. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Frosch, Warren W. Christensen, Ludwig A. Mayer, Fritz H. Woeller
  • Patent number: 4196148
    Abstract: A method for hydrolysis of polyurethane foam and recovery of diamines and polyethers (or polyesters) from the hydrolysate carried out near atmospheric pressure and temperatures above about 185.degree. C. in a reaction zone containing water vapor which comprises increasing the rate of diamine production by inclusion of a minor, but effective amount of ammonia in the reaction zone. Volitilized diamines separated from the foam are preferably removed from the reaction zone, e.g. in an overhead stream, while polyethers (or polyesters) separated from the foam are recovered as liquid bottoms from the reaction zone.
    Type: Grant
    Filed: March 16, 1979
    Date of Patent: April 1, 1980
    Assignee: Ford Motor Company
    Inventor: Lee R. Mahoney
  • Patent number: 4174427
    Abstract: Expandable-polystyrene beads suitable for use in making impervious containers are made from a recipe including styrene, free-radical initiator and polyvinyl pyrrolidone, and this practice includes a step of washing the beads in a warm aqueous solution to which an alkoxylated nonionic surfactant having 70-90 percent of its molecular weight accounted for by oxyethylene units is added in an amount effective to cause the washing to remove contaminating grafted polyvinyl pyrrolidone from the surface of the beads and cause them to become expandable into impervious product containers.
    Type: Grant
    Filed: July 21, 1978
    Date of Patent: November 13, 1979
    Assignee: BASF Wyandotte Corporation
    Inventors: Pauls Davis, Herbert H. Gahmig, Irving R. Schmolka
  • Patent number: 4110276
    Abstract: Resilient polyester foam materials. Acyl halide, polyol, and polyhydroxy cross-linking agent are reacted in the presence of alkali metal carbonate to prepare the resilient polyester foams. A process similar to that used in the one-shot preparation of polyurethane foams is used. Preferred reactants are adipyl chloride, quadrafunctional polyol based on pentaerythritol, propoxylated pentaerythritol cross-linking agent, and sodium carbonate. The resilient polyester foams find use in products such as catamenial tampons.
    Type: Grant
    Filed: October 19, 1977
    Date of Patent: August 29, 1978
    Assignee: The Procter & Gamble Company
    Inventor: Thomas A. DesMarais
  • Patent number: 4100238
    Abstract: A process for preparing permeable membranes which comprises kneading in the molten state two different kinds of thermoplastic synthetic resins which are partly compatible with each other, fabricating the molten mixture into a sheet, film or hollow article, treating the fabricated article with a solvent which is a good solvent for one of the component resins but is a poor solvent for the other to dissolve and remove the former resin, drying the fabricated article, and then stretching it. In place of the resin to be removed by the solvent, rubbers or oligomers having partial compatibility with the resin which remains undissolved can be used.
    Type: Grant
    Filed: March 22, 1976
    Date of Patent: July 11, 1978
    Assignee: Nippon Oil Company, Ltd.
    Inventor: Toshihiko Shinomura