Abstract: A prepolymer composition for producing polyurethane insulating foams from pressure tanks which consists of a prepolymer component with at least one PU prepolymer with a content of NCO groups of 4 to 20 wt % and usual additives, as well as a propellant component, with a content of 0.01 to 2 wt %, based on the prepolymer component, of polybutadiene.

Abstract: The present invention relates to an opaque, biaxially oriented polymeric film having a thermoplastic polymer matrix material within which is located a stratum of voids. The voids are formed during orientation by a cavitating agent which is a particle of a cyclic olefinic copolymer. The solid particle is phase-distinct and incompatible with the matrix material.

Abstract: A foam rubber composition and a method for making same which is foamable to a high degree and a molded product made from the foam rubber composition wherein the compositions has: (A) a low-molecular Ethylene-propylene-5-ethylidene-2-norbornene terpolymer having a Mooney viscosity (ML.sub.1+4 at 100.degree. C.) of 20 to 40, an ethylene/propylene ratio by weight of 65/35 to 50/50, an iodine value of 20 to 30, and a Q value (Mw/Mn) not exceeding 3 as determined by gel permeation chromatography; (B) a high-molecular ethylene-propylene-5-ethylidene-2-norbornene terpolymer having a Mooney viscosity (ML.sub.1+4 at 100.degree. C.) of 100 to 300, an ethylene/propylene ratio by weight of 65/35 to 50/50, an iodine value of 20 to 30 and a Q value (Mw/Mn) of 6 to 10; (C) a vulcanizing system agent containing sulfur as a vulcanizer, and zinc carbamate and sulfenamide as accelerators; and (D) a foaming agent containing N, N'-dinitrosopentamethylenetetramine and urea.

Abstract: Hot-curing, foamable reactive compositions based on natural and/or synthetic rubbers containing olefinic double bonds, vulcanizing agents and blowing agents with a high percentage content of sulfur give foamed rubber compositions exhibiting high structural strength and high volume expansion. These compositions are suitable as multifunctional filling materials for hollow structures or hollow profiles in vehicle or machine construction. At one and the same time, they perform a sealing function, damp acoustic vibration and stiffen the hollow structures to a considerable extent.

Abstract: High internal phase emulsions having an internal aqueous phase of greater than 70 percent by volume and an external oil phase comprising a vinyl polymerizable monomer contain a surfactant capable of chemically binding to the polymerizable monomer. Polymeric foams having a high internal phase emulsion stabilizing surfactant chemically bound to the polymeric material and a liquid capacity of from about 70 to 99 percent of its saturated volume can be prepared from such emulsions.

Abstract: A foamed pad material for low-pressure compression molding which comprises a crosslinked rubbery olefinic soft resin foam and exhibits (a) a hysteresis loss of not greater than 40%, (b) a gel fraction of 20 to 98%, and (c) a density of 0.025 to 0.30 g/cm.sup.3. This foamed pad material is excellent in heat weldability with core forming materials and exhibits excellent heat resistance, strain resistance, moldability and restoring properties at the time of low-pressure compression molding at which compression and drawing are carried out at high temperatures. Moreover, the foamed pad material can allow the molded skin material to have cushioning properties with high flexibility and further to have improved feeling.

Abstract: A foamed rubber blend comprising an EPDM is polymer blend comprising at least one high molecular weight component and at least one low molecular weight component is provided. The high molecular weight component has a weight average molecular weight (Mw) in a range of from about 400,000 to about 800,000 and a molecular weight distribution index (Mw/Mn) in a range of from about 5.5 to about 9.5. The low molecular weight component has a weight average molecular weight (Mw) in a range of from about 150,000 to about 500,000 and a molecular weight distribution index (Mw/Mn) in a range of from about 1.5 to about 5.5. The EPDM rubber has an overall weight average molecular weight (Mw) in a range of from about 200,000 to about 700,000. The ratio of the polymer blend in the foamed rubber blend is in a range of from about 33 wt % to about 60 wt %.

Abstract: Disclosed is a foam processable rubber composition which comprises an ethylene/.alpha.-olefin of 3 to 20 carbon atoms/non-conjugated polyene copolymer rubber (A), a crystalline polyolefin resin (B) having a melting point of 100 to 150.degree. C. and a foaming agent (C), in specific proportions. The copolymer rubber (A) has an ethylene/.alpha.-olefin molar ratio of 60/40 to 80/20, an intrinsic viscosity (.eta.), as measured in decalin at 135.degree. C., of 0.7 to 2 dl/g, and an iodine value of 10 to 50. A vulcanized rubber foam-molded product can be obtained by vulcanizing and foaming the rubber composition. The rubber composition can provide vulcanized rubber foam-molded products having excellent vulcanization properties such as weathering resistance, heat resistance, ozone resistance and tear strength. Besides, the rubber composition exhibits excellent precision moldability and productivity of vulcanized rubber foam-molded products in transfer molding, injection molding and cast molding.

Abstract: High elasticity foams can be prepared from a reprocessable blend of a thermoplastic vulcanizate and an elastic thermoplastic polymer. These foams can be mechanically foamed with water and can have elongations to break in excess of 250 percent. They also have recovery of that elongation also known as low permanent set.

Abstract: The present invention relates to a medium density chlorinated polyvinyl chloride foam and the method of preparing such a foam using a blend of chemical blowing agents. The foam having a specific gravity in the range of about 0.3 to about 1.5 comprises chlorinated polyvinyl chloride, a blend of decomposition type blowing agents, a tin stabilizer, an optional impact modifier and an optional high molecular weight process aid.

Abstract: The invention is a film having a discontinuous phase of open and closed cells and a continuous organic phase comprising:(a) one or more block copolymer(s) corresponding to the Formula I:A--B--X.sub.m --(B--A).sub.

Abstract: By achieving an extruded, foamed core formed from plastic material peripherally surrounded and integrally bonded with a cooperating synthetic, plastic, extruded, outer layer, a unique, multi-component, multi-layer synthetic closure is provided which may be employed as a bottle closure or stopper for any desired product, whether the product is a liquid, a viscous material, or a solid distributed in a bottle or container and dispensed through the open portal of the container neck. The present invention achieves a mass producible, resilient, synthetic bottle closure which is employable for any desired bottle, including wine. By employing the present invention, a multi-component or multi-layer synthetic closure is attained which possesses physical properties substantially equal to or better than the physical properties found in cork material, which has caused such cork material to be the principal closure material for wine bottles.

Abstract: A modified polypropylene resin obtained by melt-kneading a polypropylene resin, an isoprene monomer and a radical polymerization initiator, which has a high melt viscosity and a high melt tensile strengh and is hard to cause draw-down, and which provides, by foaming thereof, foamed articles having low density, high closed cell content, beautiful appearance and excellent heat resistance.

Abstract: The present invention aims to improve soundproof and heat insulating properties of a foamed plastic by reducing internal cells pressure inside foamed resins. A base polymer such as a polyester-based polyol and a volatile foaming agent having an conjugate unsaturated group (i. e., conjugate double carbon bonds and/or triple carbon bonds) such as chloroprene (bp. 51.degree. C.) and calcium stearate were blended and then mixed with a hardening agent such as hexamethylene diisocyanate. The volatile foaming agent existing in open cells of the foamed plastic sealed in the Al laminated film and between the film and the foamed plastic, i.e., gap, possesses an unsaturated group, such as isoprene. Thus polymerization may occur by irradiating with electron rays, and the inside of the foams and the gap region may be reduced in pressure while the bag of the laminated film retains its shape.

Abstract: A method of producing a polysaccharide foam is provided. The method comprises mechanically foaming an aqueous solution of a soluble polysaccharide and thereafter reacting the foam to produce stable foam. Typically, the soluble polysaccharide is an alginate, hyaluronate, carrageenans, chitosan or starch.

Abstract: The present invention relates to a medium density chlorinated polyvinyl chloride foam and the method of preparing such a foam using a blend of chemical blowing agents. The foam having a specific gravity in the range of about 0.3 to about 1.5 comprises chlorinated polyvinyl chloride, a blend of decomposition type blowing agents, a tin stabilizer, a optional impact modifier and a optional high molecular weight process aid.

Abstract: Disclosed is a foamable olefin thermoplastic elastomer composition comprising (A) a partially crosslinked thermoplastic elastomer composition, (B) long-chain branch-containing polypropylene and (C) a foaming agent. The partially crosslinked thermoplastic elastomer composition (A) is obtained by dynamically heat-treating a mixture in the presence of organic peroxide, said mixture comprising specific proportions of a peroxide-crosslinking type olefin copolymer rubber (a), which is an ethylene/.alpha.-olefin copolymer rubber composed of ethylene, an .alpha.-olefin of 3 to 20 carbon atoms and optionally a nonconjugated diene, and a peroxide-decomposition type olefin plastic (b), which is an .alpha.-olefin (co)polymer containing a specific amount of an .alpha.-olefin of 3 to 20 carbon atoms and having a specific MFR. Also disclosed is a foamed product obtained by heating the foamable olefin thermoplastic elastomer composition.

Abstract: A polyolefin based crosslinked foam excellent in impact absorbability, vibration absorbability and heat insulation, which can be used for various kinds of industrial applications such as materials for the interior of automobiles, cushioning, building, furniture, home use electric appliances, which foam comprises:a polyolefin based resin (A), and a conjugated diene polymer (B) having the peak tan .delta. value (obtained by dynamic viscoelasticity measurement) between -20.degree. C. and 40.degree. C.This invention also relates to a method for manufacturing said impact and vibration absorbable crosslinked foam.The polyolefin based crosslinked foam of this invention is excellent in impact absorbability and vibration absorbability while keeping moldability and heat resistance over a wide range of degrees of crosslinking.

Abstract: This invention relates to a thermoplastic PVC foam composition and more particularly, to the thermoplastic PVC foam composition suitable for a shoe material, which is characterized by the following fabrication and advantages. Some plasticizer and additive are added to the PVC base, plasticized by dioctyl phthalate (hereinafter called as "DOP") or epoxide soybean oil (hereinafter called as "ESO") to obtain the thermoplastic PVC foam composition. Then, one type of compound, selected from rubber thermoplastic urethane compound (hereinafter called as "TPU") and ethylenevinyl acetate copolymer (hereinafter called as "EVA"), was added to the mixture for modification.

Abstract: An integrally molded composite article comprised of (I) a nonfoam layer formed from a thermoplastic elastomer powder composition (A) and (II) a foam layer formed from a foamable composition comprised of (i)(B) a thermoplastic synthetic resin powder, and (C) a heat decomposable foaming agent or (ii)(B) a thermoplastic synthetic resin powder, (C) a heat decomposable foaming agent and (D) a liquid coating agent, wherein the thermoplastic elastomer powder (A) is comprised of a composition of an ethylene-.alpha.-olefin copolymer rubber and a polyolefin resin or a thermoplastic elastomer powder comprised of a partially cross-linked composition of an ethylene-.alpha.-olefin copolymer rubber and a polyolefin resin, the thermoplastic elastomer powder having a complex dynamic viscosity .eta.*(1) at 250.degree. C. and a frequency of 1 radian/sec of not more than 1.5.times.10.sup.5 poise and having a Newtonian viscosity index n, calculated by the following formula using the above-mentioned complex dynamic viscosity .eta.

Abstract: Disclouse is an olefin thermoplastic elastomer foamed product obtained by heating a foamable composition comprising a partially crosslinked thermoplastic elastomer composition (A), a specific olefin plastic (B) and a foaming agent (C) in specific proportions. The partially crosslinked thermoplastic elastomer (A) is obtained by dynamically heat-treating a mixture in the presence of organic peroxide, said mixture comprising specific proportions of a peroxide-crosslinkable copolymer rubber (a), which is a specific ethylene/.alpha.-olefin/nonconjugated diene copolymer rubber, and a peroxide-decomposable olefin plastic (b), which is a (co)polymer containing 50 to 100% by mol of an .alpha.-olefin of 3 to 20 carbon atoms and has a specific MFR. The olefin plastic (B) is a (co)polymer containing 50 to 100% by mol of an .alpha.-olefin of 2 to 20 carbon atoms and has a specific MFR. Also disclosed is a process for preparing the olefin thermoplastic elastomer foamed product.

Abstract: The present invention provides performance enhancing shoe components, and methods of making the same, comprising 1,4-polybutadiene and a rubber selected from the group consisting of natural rubber, synthetic isoprene rubber, polyisoprene, butadiene acrylonitrile rubber and ethylenepropylene diene modified rubber. The shoe components are most advantageously placed in the user shoe beneath the ball of the foot to increase energy return and thereby enhance athletic performance. The shoe components may be formed as midsoles and parts of midsoles, insoles and parts of insoles, or shoe inserts.

Abstract: An ethylene-.alpha.-olefin-non-conjugated diene copolymer rubber composition which comprises two kinds of ethylene-.alpha.-olefin-non-conjugated diene copolymers, ?the copolymers (A) and (B)!, copolymer (A) containing ethylidenenorbornene and either dicyclopentadiene or .alpha.,.omega.-diene having 8 to 20 carbon atoms in the main chain as the non-conjugated dienes, copolymer (B) containing ethylidenenorbornene as the non-conjugated diene, the weight ratio of the copolymer (A) to the copolymer (B) being 30/70 to 70/30, wherein the copolymer (A) has a relatively low molecular weight, a specific ethylene/.alpha.-olefin weight ratio and a specific non-conjugated diene content and the copolymer (B) has a relatively high molecular weight and a specific ethylene/.alpha.-olefin weight ratio. Said copolymer rubber composition, when highly foamed, shows no reduction particularly in low tensile stress, and is excellent in shape-retention during cross-linking and foaming, and in compression set and processibility.

Abstract: A polyol blend is disclosed for making cellular polyurethane foam products in the absence of halogenated hydrocarbon blowing agents. The products have good insulating performance, good compressive strength, and excellent dimensional stability. The blend comprises first and second polyols and is suitable for one-shot and two component reaction systems. The first polyol is the reaction product of one or more alkylene oxides and a compound selected from the group consisting of aliphatic diols, triols, pentaerythritol, water in an amount sufficient to form a diol upon reaction with alkylene oxide, and mixtures thereof.

Abstract: The present invention provides a polyethylenic foaming composition comprising (a) 100 parts by weight of an ethylenic copolymer having glycidyl groups consisting of 20 to 99.9% by weight of ethylene units, 0.1 to 30% by weight of a unit of a glycidyl ester of an unsaturated carboxylic acid or an unsaturated glycidyl ether, and 0 to 50% by weight of ethylenically unsaturated ester units other than a glycidyl ester, (b) 0.1 to 30 parts by weight of a carboxylic acid having 2 or more carboxyl groups and a molecular weight of 1500 or less, and (c) 0.1 to 20 parts by weight of a foaming agent of a thermal decomposition type. The present invention also provides a polyethylenic foam molded from said foaming composition.

Abstract: A process and apparatus are described for extruding a soft, low density elastomeric thermoplastic foam. A single screw extruder having a very large screw length to diameter ratio is provided to thoroughly mix the thermoplastic elastomer with a blowing agent. A thin, substantially taperless die is also provided to form extruded profiles. By using such a process and apparatus, a variety of complex-shaped extruded profiles may be easily produced.

Abstract: An air-permeable and water-permeable rubber includes by weight 100 parts of a rubber, about 30 to 80 parts of a plastic, about 1 to 5 parts of a cross-linking agent, about 1 to 10 parts of a vulcanizing agent, about 1 to 10 parts of a rubber accelerator, 0 to about 100 parts of a filler, and 0 to about 10 parts of an anti-aging agent. Such air-permeable and water-permeable rubber has excellent air-permeability, water-permeability, softness, and elasticity. The present invention also includes a method for producing the above rubber.

Abstract: A method of pore-size selective chemical modification of materials having pores of about 1 to 1,500 nm is disclosed. The resulting novel porous materials are particularly useful as separation media in chromatography, for selective isolation, adsorption and catalysis.

Abstract: The present invention is directed to an underlayment composition for an artificial playing surface comprised of a butadiene rubber, such as polybutadiene or styrene-butadiene that is commercially available as recycled polycord tires that have been granulized. An inorganic-base moisture-retaining agent such as vermiculite or perlite is also included in the composition in addition to a binder comprised of a mixture of isocyanate polyurethane and an inorganic acid. The present invention also provides a method of making the present composition. The method comprises the steps of mixing thoroughly granulized particles of butadiene rubber in a mixing container, mixing an inorganic-based moisture-retaining component with the butadiene rubber, mixing an acid having a pH .ltoreq.3 with the butadiene rubber and the inorganic-based moisture-retaining component, and mixing an isocyanate polyurethane with the butadiene rubber, the inorganic-based moisture-retaining component and the acid.

Abstract: Disclosed is a normally solid, high molecular weight, non-linear, substantially gel-free, propylene polymer material characterized by high melt strength due to strain hardening which is believed to be caused by free-end long chain branches of the molecular chains forming the polymer.Also disclosed is a process for making the polymer by high energy radiation of a normally solid, high molecular weight, linear, propylene polymer in a reduced active oxygen environment, maintaining the irradiated material in such environment for a specific period of time, and then deactivating free radicals in the material.Further disclosed is the use of the strain hardening polymer in extensional flow operations such as, for example, extrusion coating, film production, foaming and thermoforming.

Abstract: A plastic foam material composed of a blended resin composition which includes at least two thermoplastic resins and a silane-modified based resin. The blended resin composition consists essentially of 100 parts by weight of at least two thermoplastic resins, from about 1 to about 50 parts by weight of a silane-modified, cross-linked, thermoplastic resin; from about 0.001 to about 2.5 parts by weight of a cross-linking catalyst for use in a silane compound and from about 1 to about 20 parts by weight of a foaming agent. According to one embodiment of the present invention, the thermoplastic resins include at least two substantially incompatible and substantially uncross-linked thermoplastic resins, while in another embodiment the two thermoplastic resins need not be substantially incompatible. The blended resin composition may further include reinforcers such as glass fibers and filler. The thermodecomposition foaming agent decomposes at sufficiently high temperatures to yield a plastic foam material.

Abstract: It is disclosed a plastic foam product having and exhibiting excellent temperature resistance, tear resistance, and flexibility properties produced from a blend comprising poly-1-butene, styrenic block copolymer, and/or an olefinic rubber, and optionally a non-elastomeric polyolefin. These foams are particularly useful in very high temperature applications such as pipe wrap in refrigerators and HVAC.

Abstract: Performance enhancing shoe components, and methods of making the same, comprising 1,4-polybutadiene and a rubber selected from the group consisting of natural rubber, synthetic isoprene rubber, polyisoprene, butadiene acrylonitrile rubber and ethylenepropylene diene modified rubber. The shoe components may be formed as shoe midsoles and parts of midsoles, shoe soles and parts of soles, shoe insoles and parts of insoles, and shoe inserts.

Abstract: A plastic foam material composed of a blended resin composition which includes at least two thermoplastic resins and a silane-modified based resin. The blended resin composition consists essentially of 100 parts by weight of at least two thermoplastic resins, from about 1 to about 50 parts by weight of a silane-modified, cross-linked, thermoplastic resin; from about 0.001 to about 2.5 parts by weight of a cross-linking catalyst for use in a silane compound and from about 1 to about 20 parts by weight of a foaming agent. According to one embodiment of the present invention, the thermoplastic resins include at least two substantially incompatible and substantially uncross-linked thermoplastic resins, while in another embodiment the two thermoplastic resins need not be substantially incompatible. The blended resin composition may further include reinforcers such as glass fibers and filler. The thermodecomposition foaming agent decomposes at sufficiently high temperatures to yield a plastic foam material.

Abstract: A plastic foam material composed of a polyolefin based resin composition, consists essentially of specified amounts of polypropylene based resins and polyethylene based resins, included from about 20 to about 65 weight percent of a cross linked portion. The cross linked portion consists of from about 55 to about 95 weight percent of a cross linked polypropylene and from about 5 to about 45 weight percent of cross linked polyethylene. The amount of cross-linkage can be determined by a xylene extraction technique. The plastic foam material may further include specified amounts of a cross-linking agent and specified amounts of an organic thermodecomposition foaming agent. The thermodecomposition foaming agent decomposes at sufficiently high temperatures to yield a plastic foam material, which exhibits superior adherence properties and fewer deformities of its surface exemplified by swelling, shrinkage and wrinkling of its surface. A method to produce the plastic foam material is also disclosed.

Abstract: An integrally molded composite article comprised of (I) a nonfoam layer formed from a thermoplastic elastomer powder composition (A) and (II) a foam layer formed from a foamable composition comprised of (i)(B) a thermoplastic synthetic resin powder, and (C) a heat decomposable foaming agent or (ii)(B) a thermoplastic synthetic resin powder, (C) a heat decomposable foaming agent and (D) a liquid coating agent, wherein the thermoplastic elastomer powder (A) is comprised of a composition of an ethylene-.alpha.-olefin copolymer rubber and a polyolefin resin or a thermoplastic elastomer powder comprised of a partially cross-linked composition of an ethylene-.alpha.-olefin copolymer rubber and a polyolefin resin, the thermoplastic elastomer powder having a complex dynamic viscosity .eta.*(1) at 250.degree. C. and a frequency of 1 radian/sec of not more than 1.5.times.10.sup.5 poise and having a Newtonian viscosity index n, calculated by the following formula using the above-mentioned complex dynamic viscosity .eta.

Abstract: The present invention is directed to an underlayment composition for an artificial playing surface comprised of a butadiene rubber, such as polybutadiene or styrene-butadiene that is commercially available as recycled polycord tires that have been granulized. An inorganic-base moisture-retaining agent such as vermiculite or perlite is also included in the composition in addition to a binder comprised of a mixture of isocyanate polyurethane and an inorganic acid. The present invention also provides a method of making the present composition. The method comprises the steps of mixing thoroughly granulized particles of butadiene rubber in a mixing container, mixing an inorganic-based moisture-retaining component with the butadiene rubber, mixing an acid having a pH.ltoreq.3 with the butadiene rubber and the inorganic-based moisture-retaining component, and mixing an isocyanate polyurethane with the butadiene rubber, the inorganic-based moisture-retaining component and the acid.

Abstract: A process and apparatus are described for extruding a soft, low density elastomeric thermoplastic foam. A single screw extruder having a very large screw length to diameter ratio is provided to thoroughly mix the thermoplastic elastomer with a blowing agent. A thin, substantially taperless die is also provided to form extruded profiles. By using such a process and apparatus, a variety of complex-shaped extruded profiles may be easily produced.

Abstract: A process for producing expandable particles of a melt compounded blend of polyphenylene ether resin and polyolefin resin. A melt compounded blend of polyphenylene ether resin and polyolefin resin, a blowing agent and water are mixed in a pressure vessel to form a dispersion; the dispersion is heated in the sealed pressure vessel to impregnate the blowing agent in the melt compounded blend of resin particles; the dispersion is then cooled in the sealed pressure vessel; and a cooled blowing agent-impregnated, melt compounded blend of resin particles is removed from the reactor. A preferred blowing agent is Freon.RTM. 11. The particles are pre-expanded by heating, and the pre-expanded particles can be foamed in a conventional mold when heat is applied thereto. A resin molding composition comprising a melt compounded blend of heat-pre-expanded, low density, resilient polyphenylene ether resin and polyolefin resin particles having about 95.0 weight percent to about 5.

Abstract: A method for making a cellular rubber is described, in which water is added to a high water absorption resin, followed by allowing the resulting mixture to stand and form a hydrous gel. The hydrous gel, with or without a foaming agent, is added to a rubber compound and subjected to foaming under conditions sufficient for vulcanization thereby obtaining a cellular rubber having a closed cell structure. Cosmetic puffs using the cellular rubber are also described.

Abstract: A column packing material to be used in gel permeation chromatography (GPC) consists of support particles with a mean particle diameter of 1 to 50.mu. of which the matrix is formed by an inorganic or organic, polymeric and porous hard material with a mean pore diameter of 6 to 50 nm and a pore volume of 0.1 to 3 ml/g, the matrix pores containing chemically bound polymer chains. The column packing material of the invention is characterized in that the polymer chains consist of linear, permeable and not-crosslinked polymers with an upper exclusion limit between 200 and 200,000, the pores of the matrix being entirely filled by the polymer chains. The method of the invention is characterized in that the pores of the support particles are filled by polymer chains chemically bound to the pore surfaces, these polymer chains being permeable to solvents and partly to dissolved substances.

Abstract: The present invention provides a melamine resin foam comprising a foam body obtained by foaming a resin composition composed mainly of a melamine-formaldehyde condensate and a blowing agent, and hydrophobic component coated on said foam body.This melamine resin foam is improved in fragility and water absorbability and in which the drawbacks of the prior art have been alleviated.

Abstract: Disclosed is a cross-linked ethylenic polymer foam structure of an ethylenic polymer material of a cross-linked, substantially linear ethylenic polymer. The substantially linear ethylenic polymer having in an uncross-linked state has: a) a melt flow ratio, I.sub.10 /I.sub.2, .gtoreq.5.63; b) a molecular weight distribution, M.sub.w /M.sub.n, defined by the equation: M.sub.w /M.sub.n .ltoreq.(I.sub.10 /I.sub.2)-4.63; and c) a critical shear rate at onset of surface melt fracture of at least 50 percent greater than the critical shear rate at the onset of surface melt fracture of a linear ethylenic polymer having about the same I.sub.2 and M.sub.w /M.sub.n. Further disclosed is a process for making the above foam structure.

Abstract: A process and apparatus are described for extruding a soft, low density elastomeric thermoplastic foam. A single screw extruder having a very large screw length to diameter ratio is provided to thoroughly mix the thermoplastic elastomer with a blowing agent. A thin, substantially taperless die is also provided to form extruded profiles. By using such a process and apparatus, a variety of complex-shaped extruded profiles may be easily produced.

Abstract: Foamable thermoplastic resin compositions are provided having vinyl chloride polymer, a graft copolymer having a superstrate grafted to a substrate wherein the superstrate has alphamethyl styrene, unsaturated nitrile, and unsubstituted styrene therein, and the substrate is a butadiene rubber, a rubber-free copolymer having alkylmethacrylate, vinyl aromatic, and unsaturated nitrile therein, and a chemical blowing agent. The foamable thermoplastic resin composition may be coextruded with a non-foamed thermoplastic resin skin to produce a coextruded rigid foamed structure by a process of coextruding the skin and foamable thermoplastic composition. The composition and process are useful for making coextruded rigid foam structures which are useful in rigid foam applications such as foamed pipe and foamed sheet.

Abstract: A dry, initially non-tacky, expansible, shaped and formed sealant and baffle component is provided for sealing and providing an acoustic baffle for cavities in the hollow structural components of a vehicle body or the like, which during the manufacturing operation is conveyed through a bake oven at an elevated temperature. The component is made up of a metal ion neutralized ethylene-.alpha., .beta. ethylenically unsaturated carboxylic acid copolymer (ionomer), a blowing agent, and a tackifier, and optionally with an additive polymer and a cross-linking agent. The blowing agent is selected to be activated at the temperature of the bake oven so that the shaped and formed component expands in the body cavity to seal the cavity and prevent ingress of moisture, dust and other contaminating materials and particles, as well as to form a sound barrier therein.

Abstract: A foamed elastomeric polymer with a camouflage appearance on its surface and throughout its mass, characterized by distinct, randomly sized regions of various colors, having curved, nonangular borders with substantially no blend of colors, and being free from gas pockets and blisters. A process for manufacturing a foamed elastomeric polymer of the above description.

Abstract: An elastomeric, hot-melt adhesive foam is disclosed. The adhesive foam preferably comprises an elastomeric, hot-melt adhesive material formed from:(a) about 15% to about 60%, by weight of the adhesive material, of an A-B-A block copolymer, in which the A block is derived from styrene and the B block is derived from butadiene or isoprene;(b) about 30% to about 70%, by weight of the adhesive material, of an aromatic modified hydrocarbon resin which associates with both the B block and A blocks of the A-B-A block copolymer; and(c) 0 to about 30%, by weight of the adhesive material, of a processing oil.The proportions of the components (a), (b), and (c) are selected such that the elastomeric, hot-melt adhesive material has a viscosity of less than about 200,000 centipoise at 325.degree. F. and an elastomeric retention value of at least 75%.

Abstract: A process for preparing a cellular polymer containing perforated cell windows in the presence of a perforating agent being a substance that has a critical surface free energy of less than about 23 mj/m.sup.2 is disclosed. The cellular polymers obtained according to this invention have a fine cell structure and show enhanced dimensional and thermal insulation stability. The invention also relates to rigid polyurethane foam prepared in the presence of, for example, particulate poly(tetrafluoroethylene) or a liquid polyfluoro- or perfluorocarbon, with a boiling point of at least 130.degree. C., as perforating agent.

Abstract: An ultra low density polyolefin foam having a density of about 0.6 to about 1.5 pounds per cubic foot comprising a heat-plastified mixture comprising (1) a non-elastomeric olefin polymer resin selected from the group consisting of ethylene homopolymers, non-elastomeric copolymers of ethylene and a copolymerizable monomer, and propylene homopolymers; (2) an elastomer in an amount of about 3 to about 30 wt. parts per 100 wt. parts of said non-elastomeric olefin polymer resin; (3) polystyrene in an amount of about 1 to about 15 wt. parts per 100 wt. parts of said olefin polymer resin; (4) a stability control agent selected from the group consisting of partial esters of long chain fatty acids with polyols, higher alkyl amines, fatty acid amides, and olefinically unsaturated carboxylic acid copolymers, and (5) a hydrocarbon blowing agent having from 1 to 6 carbon atoms and a boiling point between -175.degree. C. and 50.degree. C.