Patent ES-8602069-A1 (ES)
Title: Low density closed-cell foamed articles from ethylene copolymer/vinyl or vinylidene halide blends.
IPC: C08J9/00
Filed: 1983-09-22
Abstract: A crosslinkable foamable compsn. comprises 5-95wt.% of an ethylene copolymer (I), 5-95wt.% of a vinyl or vinylidene halide polymer, 0.5-20wt.% of a chemical blowing agent and 0.2-5.0wt.% of a free radical crosslinking agent. (I) is a copolymer of ethylene with 1-30wt.% carbon monoxide or sulphur dioxide and 1-60wt.% of a 3-20C unsatd. mono- or di-carboxylic acid or ether thereof, a vinyl 2-18C satd. carboxylate, a vinyl 1-18C alkyl ether, a vinyl or vinylidene halide, acrylonitrile, methacrylonitrile, norbornene, a 3-12C alpha-olefin or a vinyl aromatic cpd. - The compsn. produces a closed cell foam on heating with good dimensional and heat stability. The CO or SO2 comonomer increases the compatibility of (I) with the halide polymer. EPAB- EP-107371 B A crosslinkable foamable composition comprising (a)  to 95 weight percent based on polymer weight of a copolymer of (i) 10 to 98 weight percent based on copolymer of ethylene; (ii) 1 to 60 weight percent based on copolymer of a softening monomer selected from unsaturated mono- or carboxylic acids of 3-20 carbon atoms, esters of said unsaturated mono- or dicarboxylic acids, vinyl esters of saturated carboxylic acids where the acid group has 2-18 carbon atoms, vinyl alkyl ethers wherein the alkyl group has 1-18 carbon atoms, vinyl or vinylidene halides, acrylonitrile, methacrylonitrile, norbornene, alpha olefins of 3-12 carbon atoms and vinyl aromatic compounds; and (iii) 1 to 30 weight percent based on copolymer of carbon monoxide or sulfur dioxide; (b) 5 to 95 weight percent based on polymer weight of a stabilised vinyl or vinylidene halide polymer this being a homopolymer or a copolymer with a vinyl ester, acrylonitrile, an acrylic ester, vinylidene chloride, vinylchloride, an ester of an unsaturated carboxylic acid or a vinyl ether as a comonomer; (c) 0.5 to 20 weight percent based on the blend of a chemical blowing agent; and (d) 0.2 to 5.0 weight percent based on the blend of a free radical crosslinking agent; the polymer weight specified in ''(a)'' and in ''(b)'' being the combined weight of constituents ''(a)'' and ''(b)'', and the weight percentages based on the blend specified in ''(c)'' and ''(d)'' being the respective weight percentages based on the weight of the whole composition. (8pp) - EP-107371 B A crosslinkable foamable composition comprising (a) to 95 weight percent based on polymer weight of a copolymer of (i) 10 to 98 weight percent based on copolymer of ethylene; (ii) 1 to 60 weight percent based on copolymer of a softening monomer selected from unsaturated mono- or carboxylic acids of 3-20 carbon atoms, esters of said unsaturated mono- or dicarboxylic acids, vinyl esters of saturated carboxylic acids where the acid group has 2-18 carbon atoms, vinyl alkyl ethers wherein the alkyl group has 1-18 carbon atoms, vinyl or vinylidene halides, acrylonitrile, methacrylonitrile, norbornene, alpha olefins of 3-12 carbon atoms and vinyl aromatic compounds; and (iii) 1 to 30 weight percent based on copolymer of carbon monoxide or sulfur dioxide; (b) 5 to 95 weight percent based on polymer weight of a stabilised vinyl or vinylidene halide polymer this being a homopolymer or a copolymer with a vinyl ester, acrylonitrile, an acrylic ester, vinylidene chloride, vinylchloride, an ester of an unsaturated carboxylic acid or a vinyl ether as a comonomer; (c) 0.5 to 20 weight percent based on the blend of a chemical blowing agent; and (d) 0.2 to 5.0 weight percent based on the blend of a free radical crosslinking agent; the polymer weight specified in ''(a)'' and in ''(b)'' being the combined weight of constituents ''(a)'' and ''(b)'', and the weight percentages based on the blend specified in ''(c)'' and ''(d)'' being the respective weight percentages based on the weight of the whole composition. (8pp) GBAB- GB2127417 B Crosslinkable foamable compsn. comprises 5-95 wt.% of an ethylene copolymer (I), 5-95 wt.% of a vinyl or vinylidene halide polymer, 0.5-20 wt.% of a chemical blowing agent and 0.2-5 0.2-5.0 wt.% of a free radical crosslinking agent. (I) is a copolymer of ethylene with 1-30 wt.% CO or SO2 and 1-60 wt.% of a 3-20C unsatd. mono- or di-carboxylic acid or its either a vinyl 2-18C satd. carboxylate, a vinyl 1-18C alkyl ether, a vinyl  or vinylidene halide, acrylonitrile, methacrylonitrile, norbornene, a 3-12C alpha-olefin or a vinyl aromatic cpd. - The compsn. produces a closed cell foam on heating with good dimensional and heat stability. The CO or SO2 comonomer increases the compatibility of (I) with the halide polymer.  (5pp)t