Abstract: Insulating foam for refrigerators and the like is prepared by blowing in the presence of carbon dioxide as the sole or principal blowing agent. The thermal conductivity of the foam is decreased by sealing said foam in a gas-impervious enclosure with at least one getter, such as an alkaline material, capable of removing carbon dioxide and at least one drying agent which will produce a relative humidity greater than the equilibrium relative humidity over a saturated aqueous solution of the getter, thus removing water without rendering the getter anhydrous. For example, calcium chloride dihydrate may be used when the getter is sodium hydroxide.

Abstract: A composition which cures and foams at room temperature contains a acid-catalyzed, polymerizable resin, an acid and a filler which liberates gas in an endothermic reaction with the acid. The acid serves the dual purpose of catalyzing the polymerization reaction and generating the foaming gas.

Abstract: Condensation polymerization followed by a supercritical extraction step can be used to obtain highly cross-linked nanoporous polymers with high surface area, controlled pore sizes and rigid structural integrity. The invention polymers are useful for applications requiring separation membranes.

Abstract: A foamable organic composition comprising a compound foamable to 50% or more comprising an organic polymer and a chemical foaming agent, and, as a physical foaming agent, at least one member selected from the group consisting of rare gases and carbon dioxide; and a method for producing a foamed article having a high expansion ratio by using said composition. According to the present invention, a foamed article having a uniform and fine foam structure and a high expansion ratio of not less than 75% (which is as high as when freon gas is used) can be obtained without causing environmental problems such as depletion of the ozon layer. When applied, in particular, to a foamed layer for an insulated conductor, such as foam-insulated electric wire which is required to have high performance insulation and is occasionally installed under severe conditions, the composition of the present invention advantageously provides an insulated conductor with no potential buckling.

Abstract: Disclosed is a compatibilized carbon black useful in melt processing of plastic material. The carbon black is coated with a compatibilizing agent which enhances the dispersibility of the carbon black in a melt of the plastic material. Further disclosed are processes for making plastic foam structures with the compatibilized carbon black.

Abstract: Disclosed is a low density, dimensionally-stable, extruded propylene polymer foam comprising primarily of an expanded propylene polymer material wherein the foam has a blowing agent comprising at least 15 percent by weight of one or more inorganic blowing agents. The propylene polymer material comprises at least about 15 weight percent of propylene monomeric units. The foam has a density of from about 10 to about 150 kilograms per cubic meter. The foam having an average cell wall thickness of less than about 35 micrometers.

Abstract: Insulating foam for refrigerators and the like is prepared by blowing in the presence of carbon dioxide as the sole or principal blowing agent. The thermal conductivity of the foam is decreased by sealing said foam in a gas-impervious enclosure with at least one getter, such as an alkaline material, capable of removing carbon dioxide and at least one drying agent which will produce a relative humidity greater than the equilibrium relative humidity over a saturated aqueous solution of the getter, thus removing water without rendering the getter anhydrous. For example, calcium chloride dihydrate may be used when the getter is sodium hydroxide.

Abstract: An uncrosslinked, closed cell, low density ethylenic polymer foam having a density of less than 150 kg/m.sup.3 is prepared from, for example, uncrosslinked low density polyethylene using inorganic blowing agents, such as carbon dioxide, argon, or mixtures thereof. A process for preparing such uncrosslinked, closed cell, low density ethylenic polymer foam comprising extruding a ethylenic polymer of suitable melt tension using a 100 percent inorganic blowing agent, such as carbon dioxide, argon, or mixtures thereof, and the foams produced with this process are also disclosed.

Abstract: A composition useful for rotational molding and method of rotomolding are provided. The composition advantageously includes particulate matter of significantly different sizes. A first polymer is provided as particulate matter of one size, and a second polymer is provided as particulate matter of a smaller size. During rotomolding, the first polymer forms an inner layer and the second polymer forms an outer layer. Beneficially, foaming may be provided during rotomolding to foam the inner layer.

Abstract: The invention relates to a process for the production of plastics containing amide groups with elimination of CO.sub.2 by reaction of polyfunctional isocyanates, carboxylic acids and, optionally, alcohols in the presence of tertiary amines, more particularly heteroaromatic amines. The heteroaromatic amines preferably contain another heteroatom and/or substituents having +I and/or +M effects. The reaction preferably starts at room temperature. Fine-cell foams having an acid value of less than 40 and a density of at most 150 g/l can be produced in short reaction times at room temperature without any need for additional blowing agents.

Abstract: The pourable porous carrier material is produced from at least one thermoplastic basic polymer with additives incorporated in the porous structure.First suitable foaming agents are added to the basic polymer, the mass is melted, mixed before and/or after melting. The mixture is then preferably extruded and cooled to form a pourable porous carrier material.At least one additive is added to the porous carrier material and mixed with this at a temperature (T.sub.M) below the melting point of the basic polymer but above the melting point of the additive.The porous carrier material has preferably ellipsoid pores which are brought into their longitudinal form during extrusion.

Abstract: An expandable thermoplastic composition is disclosed for extrusion foaming wherein the composition comprises a polyethylene resin; a blowing agent, which is either ethane or a blend of carbon dioxide and either normal butane, isobutane, propane, ethane, or a mixture of any two or more of these hydrocarbons in admixture with the resin in a ratio of about one part blowing agent to about 10 parts resin; nucleation agent in an amount of from about 0.05 to 0.5 kg per 100 kg of the resin; and glycerol monostearate aging modifier in an amount of from about 0.5 to 5 kg per 100 kg of the resin. A process for extrusion foaming of the composition is also disclosed.

Abstract: Process for the production of foam boards having a minimum thickness of 20 mm and a cross-sectional area of at least 50 cm.sup.2 by extruding a mixture of the styrene polymer, from 1 to 10% by weight, based on the styrene polymer, of a blowing agent, wherein the blowing agent contains at least one ether from the group consisting of dimethyl ether, methyl ethyl ether and methyl vinyl ether.

Abstract: Foams comprising innumerable cells dispersed in thermoplastic polymer compositions substantially consisting of polylactic acid or a copolymer of lactic acid and hydroxycarboxylic acid and having degradable characteristics in the natural environment.The foams can be used for containers such as food trays and throw away cups comprising molded sheet foam of a thermoplastic and degradable polymer or heat insulating materials and cushioning materials comprising bulk foam.

Abstract: A thermoplastic resin such as a styrene/maleic anhydride copolymer is treated to remove volatile impurities such as unreacted styrene by admixing with a chemical blowing agent and extruding under a vacuum. The chemical blowing agent is converted into an inert gas such as carbon dioxide during extrusion; the gas evolved is removed, together with the volatile impurities, through one or more vents in the extruder. The use of a chemical blowing agent, rather than the inert gas itself, permits the facile distribution of the CO.sub.2 stripping agent throughout the molten thermoplastic resin using commonly available extruders without the need for elaborate gas injection means.

Abstract: A method for lowering the melt flow rate of flame retardant expanded polystyrene is provided. The method comprises treating the flame retardant expanded polystyrene with an aqueous solution of sodium bicarbonate. In another aspect of the present invention a method for pelletizing recycled flame retardant expanded polystyrene is provided. The method comprises treating ground flame retardant polystyrene in an aqueous solution of sodium bicarbonate; condensing the treated polystyrene; extruding the polystyrene; and pelletizing the polystyrene. In another aspect of the present invention the electrostatic build-up on polystyrene is reduced by contacting the polystyrene with an aqueous solution of sodium bicarbonate.

Abstract: A process for providing extrudable polyacrylonitrile compositions. Dry, particulate polyacrylonitrile having a moisture content of less than about 1.5 percent is mixed with a liquid plasticizer such as ethylene carbonate or propylene carbonate at a mixing temperature of about 140.degree. C. to about 180.degree. C. This process produces an extrudable polyacrylonitrileplasticizer composition which can be extruded to form film, fiber or other extruded or co-extruded products.

Abstract: There is disclosed an ethylene polymer composition including a low density ethylene polymer blended with from about 2.0% by weight to about 60.0% by weight of the total composition of a recycled high density ethylene polymer and a compatibilizer comprising from about 0.1% to about 1.5% by weight zinc oxide and about 0.1% to 2.0% by weight of glycerol monostearate. The polymer composition may also include a foaming agent is present in an amount from 5 to 30 parts per hundred. There is also provided a method for producing the ethylene polymer compositions.

Abstract: Disclosed is a foamable styrenic polymer gel capable of forming a closed-cell foam structure, comprising: a) a flowable melt of a styrenic polymer material comprising greater than 50 percent by weight styrenic monomeric units and about 0.1 to about 40 percent by weight of oxygen-containing monomeric units based upon the total weight of the styrenic polymer material; and b) a blowing agent comprising about 5 weight percent or more carbon dioxide based upon the total weight of the blowing agent. Further disclosed is a process for making the foam structure. The oxygen-containing comonomer content in the styrenic polymer material enables process operating pressures to be significantly reduced when using carbon dioxide as a blowing agent compared to a styrenic polymer material without comonomer content. The foam structure formed is of low density and of good quality.

Abstract: A coated wire comprising:(i) an electrical conductor coated with(ii) a mixture of (a) two linear copolymers of ethylene and one alpha-olefin having 3 to 8 carbon atoms, the first ethylene copolymer having a density of about 0.900 to 0.930 gram per cubic centimeter and a melt index of about 0.1 to about 5 grams per 10 minutes and the second ethylene copolymer having a density of 0.931 to about 0.950 gram per cubic centimeter and a melt index of about 0.1 to about 5 grams per 10 minutes, and for each 100 parts by weight of the first ethylene copolymer, there are about 15 to about 100 parts by weight of the second ethylene copolymer, and (b) for each 100 parts by weight of component (a), there are about 65 to about 150 parts by weight of a mixture comprising huntite and hydromagnesite in a weight ratio of about 2:1 to about 1:1.

Abstract: A process for producing thin microporous polymeric films for a variety of uses. The process utilizes a dense gas (liquified gas or supercritical fluid) selected to combine with a solvent-containing polymeric film so that the solvent is dissolved in the dense gas, the polymer is substantially insoluble in the dense gas, and two phases are formed. A microporous film is obtained by removal of a dense gas-solvent phase.

Abstract: An expandable monovinylidene aromatic polymer resin composition comprising: a) a monovinylidene aromatic substrate polymer; b) a plasticizing amount of a solid (at room temperature and pressure), low molecular weight polymer of limonene or alpha methyl styrene and, optionally, another copolymerizable vinyl aromatic monomer, having a weight average molecular weight of from about 1,000 to about 70,000, a volatiles content of up to about 30% and a glass transition temperature of at least about 25.degree. C.; and c) a blowing agent. The invention further includes a process for producing a closed-cell polymer foam from the composition of the invention, and the resulting polymer foam. Advantageously, the foam of the invention can be produced using only CO.sub.2 as a blowing agent.

Abstract: An uncrosslinked, closed cell, low density ethylenic polymer foam having a density of less than 150 kg/m.sup.3 is prepared from, for example, uncrosslinked low density polyethylene using inorganic blowing agents, such as carbon dioxide, argon, or mixtures thereof. A process for preparing such uncrosslinked, closed cell, low density ethylenic polymer foam comprising extruding a ethylenic polymer of suitable melt tension using a 100 percent inorganic blowing agent, such as carbon dioxide, argon, or mixtures thereof, and the foams produced with this process are also disclosed.

Abstract: The presence in foamable, curable organosiloxane compositions of a hydrogenated glyceride of an ethylenically unsaturated carboxylic acid imparts sufficient thixotropy to the uncured composition to inhibit flow without adversely affecting desirable properties of the cured foam such as density and texture.

Abstract: Low thermal conductivity insulation for refrigerators and the like is produced by blowing a resinous foam in an inert (e.g., nitrogen) atmosphere with a mixture of carbon dioxide and a low thermal conductivity inert gas such as krypton or xenon. The foam is then sealed in a gas-impervious enclosure and carbon dioxide is removed therefrom, typically by inclusion in said enclosure of a solid material reacted therewith such as an alkaline reagent. The final partial pressure of the low thermal conductivity gas in the enclosure is in the range of about 20-200 torr, and the total pressure is up to 110% of said partial pressure.

Abstract: Disclosed is an extruded, open-cell alkenyl aromatic polymer foam useful in insulating applications. The foam has an open cell content of about 30 to about 80 percent. The foam further has in minor dimension and cross-section of greater than 0.25 inches. The foam has a high heat distortion temperature, and is particularly useful in roofing applications. Further disclosed is a process for making the open-cell foam.

Abstract: The present invention relates to thermoplastic foams in which .beta.-ketocarboxylic acids, .beta.-ketocarboxylic acid esters or tert.-butyl esters of organic acids are used as the foaming agents.

Abstract: A breathable, hydrolyzable, porous film having long-term stability in mechanical properties which is obtained by the process comprising adding from 40 to 250 parts by weight of a finely-powdered filler having an average particle size of from 0.3 to 4 .mu.m to 100 parts by weight of a polylactic acid-based resin composition comprising from 80 to 95% by weight of polylactic acid or a lactic acid-hydroxycarboxylic acid copolymer and from 5 to 20% by weight of a plasticizer comprising a citric acid ester, melting and film-forming the resultant mixture, and successively stretching the thus-obtained film 1.1 times or more at least in the direction of the axis; and which is consequently useful as a material for leakproof films of sanitary materials such as a paper diaper and packaging materials, and does not accumulate as wastes because of hydrolyzability in the natural environment in the case of being abandoned after use.

Abstract: The present invention provides a new and improved method of producing coating materials comprising the steps of providing a first organic material which is solid at room temperature, providing a second organic material which is solid at room temperature and which is substantially different in chemical composition from the first organic material, providing a source of supercritical fluid, providing a first container having a mechanical agitator, providing a second container, introducing the first and second organic materials and the supercritical fluid into the first container and mechanically agitating such materials and the supercritical fluid, and discharging the contents of the first container into the second container so as to collect substantially all of the first and second organic materials in the second vessel, the second container being maintained at a lower pressure than the first container.

Abstract: Disclosed is a compatibilized carbon black useful in melt processing of plastic material. The carbon black is coated with a compatibilizing agent which enhances the dispersibility of the carbon black in a melt of the plastic material. Further disclosed are processes for making plastic foam structures with the compatibilized carbon black.

Abstract: Disclosed is a foamable styrenic polymer gel capable of forming a closed-cell foam structure, comprising: a) a flowable melt of a styrenic polymer material comprising greater than 50 percent by weight styrenic monomeric units and about 0.1 to about 40 percent by weight of oxygen-containing monomeric units based upon the total weight of the styrenic polymer material; and b) a blowing agent comprising about 5 weight percent or more carbon dioxide based upon the total weight of the blowing agent. Further disclosed is a process for making the foam structure. The oxygen-containing comonomer content in the styrenic polymer material enables process operating pressures to be significantly reduced when using carbon dioxide as a blowing agent compared to a styrenic polymer material without comonomer content. The foam structure formed is of low density and of good quality.

Abstract: Low thermal conductivity insulation for refrigerators and the like is produced by blowing a resinous foam in an inert (e.g., nitrogen) atmosphere with a mixture of carbon dioxide and a low thermal conductivity inert gas such as krypton or xenon. The foam is then sealed in a gas-impervious enclosure and carbon dioxide is removed therefrom, typically by inclusion in said enclosure of a solid material reacted therewith such as an alkaline reagent. The final partial pressure of the low thermal conductivity gas in the enclosure is in the range of about 20-200 torr, and the total pressure is up to 110% of said partial pressure.

Abstract: Disclosed is a foamable styrenic polymer gel containing an aqueous blowing agent capable of forming a closed-cell, unimodal foam structure. The gel composes in admixture the flowable melt of a polymer composition having greater than 50 percent by weight of a styrenic polymer and a blowing agent having about 1 percent or more by weight water based upon the total weight of the blowing agent. The styrenic polymer has a degree of water solubility sufficient to ensure formation of a unimodal foam structure instead of a bimodal foam structure. The unimodal cell size distribution provides desirable fabricability and machinability characteristics for the foam structure.

Abstract: A polystyrene resin in foam form having a basis weight of less than about 20 g/100 in.sup.2 and a density of about 6 lbs./ft.sup.3 or less, the foam precursor of which is either a polystyrene having a melt index of about 8 or more or a polystyrene in combination with a minor proportion of any other material which will result in a melt index of about 8 or more. A method of forming such a polystyrene resin foam structure includes combining the resin in molten form under pressure with the blowing agent of at least approximately 100% carbon dioxide and extruding the mixture through a die into an atmosphere of reduced pressure to form the foam structure.

Abstract: An expandable thermoplastic composition is disclosed for extrusion foaming wherein the composition comprises a polyethylene resin; a blowing agent comprising a blend of about 50% by weight of carbon dioxide and about 50% by weight of either normal butane, isobutane, propane, or a mixture of any two or all three hydrocarbons in admixture with the resin in a ratio of about one part blowing agent to about 10 parts resin; zinc oxide nucleation agent in an amount of from about 0.05 to 0.5 kg per 100 kg of the resin; and glycerol monostearate aging modifier in an amount of from about 0.5 to 5 kg per 100 kg of the resin. A process for extrusion foaming of the composition is also disclosed.

Abstract: An improved polystyrene foam having less corrugation is disclosed which uses carbon dioxide as the blowing agent and 1-30 weight percent endothermic agent, such as water, with the weight based on the total carbon dioxide blowing agent and endothermic agent weight. This combination of carbon dioxide and endothermic agent decreases the corrugation of the thermoplastic foam, while just slightly increasing density, when the process parameters, including throughput, are equivalent to using only carbon dioxide. The process an also allow an increased foaming temperature and greater process throughput of an equivalent density thermoplastic foam at approximately equivalent corrugation levels when compared to the use of only using only carbon dioxide.

Abstract: Disclosed is a process for obtaining polyester articles, including foamed articles, containing low levels of extractable branching agent. The process comprises: (1) forming a molten mixture comprising (i) a major amount of a first resin composition comprising polyester and from 0 up to about 1 wt. % of a compound capable of branching the polyester, and (ii) a minor amount of a second polyester resin composition comprising at least about 50 wt. % polyester resin and greater than about 2 wt. % of a compound capable of branching the polyester, wherein the relative amounts of (i) and (ii) are such that said molten mixture comprises from about 0.1 wt. % to about 1 wt. % of said branching compound; (2) adding a blowing agent to the molten mixture; and (3) extruding the resultant mixture to obtain a foam. The invention is also directed to the second composition used in the above process, and foamed polyester articles obtained from the process.

Abstract: Disclosed is a flexibilized, insulative styrenic polymer foam structure comprising a foam of a polymeric composition of a styrenic polymer greater than 50 percent by weight styrenic monomeric units, the foam having relatively larger primary cells with an average cell size range of about 0.05 to about 1.2 millimeters and relatively smaller secondary cells ranging in cell size from about 5 percent to about 50 percent of the average cell size of the primary cells. The primary and secondary cells constitute at least about 90 percent of the total cell volume within the foam structure. Between 1 and 30 percent by number of the cells have microscopic "pinholes" between them. The presence of the pinholes enhances the flexure of the foam structure. Further disclosed is a method of insulating a surface comprising applying to the surface an insulating panel fashioned from the structure of claim 1.

Abstract: A foam spacer which is usable as a cork substitute in the base cushion layer of a glass spacer. The spacer, which is adapted to replace natural cork spacers is preferably laminated to a tack layer or otherwise adhered to a surface. The spacer is formed from a plasticized foamable resin which includes a quantity of incorporated reinforcing agents.

Abstract: Compositions for producing foamed products which include additives and blowing agents which cause the surface treatment additives to migrate to the surfaces of foamed products. The products produced from the compositions require less additives because the incorporated additives are concentrated at the surfaces thereof.

Abstract: An expandable polyolefin composition is disclosed for forming antistatic foam products. The composition includes a polyolefin resin; a hydrocarbyl sulphonate; and an ester of a long-chain fatty acid and polyhydric alcohol. Each of the sulphonate and the ester are present in the composition in an amount sufficient to form a polyolefin product having desirable antistatic properties. A process for extrusion foaming of the composition, and thus formed foam products, are also disclosed.

Abstract: Compositions for producing foamed products which include additives and blowing agents which cause the surface treatment additives to migrate to the surfaces of foamed products. The products produced from the compositions require less additives because the incorporated additives are concentrated at the surfaces thereof.

Abstract: A method for lowering the melt flow rate of flame retardant expanded polystyrene is provided. The method comprises treating the flame retardant expanded polystyrene with an aqueous solution of sodium bicarbonate. In another aspect of the present invention a method for pelletizing recycled flame retardant expanded polystyrene is provided. The method comprises treating ground flame retardant polystyrene in an aqueous solution of sodium bicarbonate; condensing the treated polystyrene; extruding the polystyrene; and pelletizing the polystyrene. In another aspect of the present invention the electrostatic build-up on polystyrene is reduced by contacting the polystyrene with an aqueous solution of sodium bicarbonate.

Abstract: A thermoplastic molding composition suitable for the preparation of foam is disclosed. The composition comprises a thermoplastic resinous component and a foaming agent which includes A) (i) 0.01 to 4.8% alumina hydrate (aluminum hydroxide) in combination with (ii) 0.01 to 4.8% of an acidic additive or B) 0.01 to 4.8% of the reaction product of said (i) and said (ii), the percentages being relative to the weight of the composition to be foamed. The invention is based on the finding that the foaming of the composition does not lead to any significant reduction in molecular weight of the resinous component or to troublesome discoloration of the foam, even during its re-extrusion.

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.

Abstract: Disclosed is a process for making closed-cell, alkenyl aromatic polymer foam packing bodies. An alkenyl aromatic polymer material is heated to form a melt polymer material. The melt polymer material comprises greater than 50 percent by weight alkenyl aromatic monomeric units. A blowing agent is incorporated into the melt polymer material at an elevated pressure to form a foamable gel. The blowing agent has about 20 weight percent or more based upon the total weight of the first blowing agent selected from the group consisting of carbon dioxide and ethane. The foamable gel is extruded through a die to form a foam strand. The foam strand is pelletized to form a plurality of foam bodies. The bodies are further expanded by exposing them one or more times to heated air or steam. Preferably, the bodies are allowed to age for a preselected period of time after pelletizing and between subsequent expansions.

Abstract: A polystyrene resin in foam form having a basis weight of less than about 20 g/100 in.sup.2 and a density of about 6 lbs./ft.sup.3 or less, the foam precursor of which is either a polystyrene having a melt index of about 8 or more or a polystyrene in combination with a minor proportion of any other material which will result in a melt index of about 8 or more. A method of forming such a polystyrene resin foam structure includes combining the resin in molten form under pressure with the blowing agent of at least approximately 100% carbon dioxide and extruding the mixture through a die into an atmosphere of reduced pressure to form the foam structure.

Abstract: Disclosed is a process for making extruded, closed-cell alkenyl aromatic polymer foam structure having an average cell size of from about 0.3 to about 3.0 millimeters. The process comprises: a) heating an alkenyl aromatic polymer material having greater than 50 percent by weight alkenyl aromatic monomeric units to form a melt polymer material; b) incorporating into the melt polymer material at an elevated pressure a blowing agent comprising at least 50 percent by weight 1,1-difluoroethane (HFC-152a) based upon the total weight of the blowing agent to form a foamable gel; c) cooling the foamable gel to an optimum foaming temperature prior to extrusion through a die; and d) extruding the foamable gel through a die to form the foam structure. Further disclosed is a foamable gel capable of forming an alkenyl aromatic polymer foam structure having an average cell size of from about 0.3 to about 3.0 millimeters.

Abstract: A stabilized powdered endothermic blowing agent .[.which.]. is a mixture or a polycarboxylic acid and an inorganic carbonate, .[.and.]. .Iadd.the .Iaddend.polycarboxylic acid and inorganic carbonate each having been surface treated with a component which prevents water from being absorbed thereby. The blowing agent is incorporated into a polymeric concentrate used for producing foamed products.

Abstract: Compositions for producing foamed products which include additives and blowing agents which cause the surface treatment additives to migrate to the surfaces of foamed products. The products produced from the compositions require less additives because the incorporated additives are concentrated at the surface thereof.