Production of foamed polyolefin composite sheet |
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| 申请号 | US3608006D | 申请日 | 1967-09-25 | 公开(公告)号 | US3608006A | 公开(公告)日 | 1971-09-21 |
| 申请人 | FURUKAWA ELECTRIC CO LTD; | 发明人 | HOSODA KIROKURO; SHIINA NAONORI; UENO HIDEYO; SASAJIMA JUNNOSUKE; YANASE JUNICHI; ITOH TETSUO; OHSUMI TERUTOSHI; | ||||
| 摘要 | Production of a foamed polyolefin composite sheet, which comprises milling the polyolefin with a cross-linking agent and a blowing agent homogeneously to obtain a composition, moulding the composition into a sheet, adhering the sheet with a lining such as cloth or paper by means of an adhesive to form a composite sheet and then heating the composite sheet at a temperature higher than the decomposition temperatures of the cross-linking agent and the blowing agent to form cross-linkage and foam and subjecting to embossing. | ||||||
| 权利要求 | 2. A method for producing a foamed polyolefin composite sheet which comprises homogeneously milling a solid crystalline thermoplastic polyolefin selected from the group consisting of high, medium and low pressure process polyethylene, polypropylene, polybutene-1, ethylene-propylene copolymers, ethylene-butene copolymers, ethylene-styrene copolymers, ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers, ethylene-acrylic acid ester copolymers, propylene-butene copolymers and a mixture of two or more of these polyolefins with a cross-linking agent capable of cross-linking said polyolefin and selected from group consisting of organic peroxide, polysulphonazides, azidoformates, aromatic polyazides and quinonedioximes, and a blowing agent selected from the group consisting of p,p''-oxybis-benzene-sulfonyl hydrazide, azodicarbonamide and dinitroso-pentamethylene-tetramine, at a temperature sufficient to melt said polyolefin but not to decompose said cross-linking agent and said blowing agent to obtain a composition, molding said composition into a thin sheet by means of a calender or an extruder at substantially the same temperature as described above, bonding said sheet with a lining selected from the group consisting of woven fabrics, nonwoven fabrics, paper and metal foils to form a composite sheet by means of an adhesive, bonding a polyolefin layer containing no blowing agent on the surface of the polyolefin side of the above-described composition to form a laminate sheet, heating said laminate sheet at a temperature higher than the decomposition temperatures of the cross-linking agent and the blowing agent under atmospheric pressure to form cross-linkage and foam in said polyolefin, and subjecting the thus treated sheet to embossing. 3. A method as claimed in claim 2, wherein said olefin composition containing no blowing agent contains a cross-linking agent. 4. A method for producing a foamed polyolefin composite sheet, which comprises homogeneously milling a solid crystalline thermoplastic polyolefin selected from the group consisting of high, medium and low pressure process polyethylene, polypropylene, polybutene-1, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-styrene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer, propylene-butene copolymer and a mixture of two or more of these polyolefins with a cross-linking agent capable of cross-linking said polyolefin and selected from the group consisting of organic peroxide, polysulphonazides, azidoformates, aromatic polyazides and quinonedioximes and a blowing agent selected from the group consisting of p,p''-oxybis-benzene-sulfonyl hydrazide, azodicarbonamide and dinitroso-pentamethylene-tetramine, at a temperature sufficient to melt said polyolefin but not to decompose said cross-linking agent and said blowing agent to obtain a composition, molding said composition into a thin sheet by means of a calendar or an extruder at substantially the same temperature as described above, bonding said sheet with a lining sheet selected from the group consisting of woven fabrics, nonwoven fabrics, paper and metal foils to form a composite sheet by means of an adhesive, heating said composite sheet at a temperature higher than the decompOsition temperature of said cross-linking agent under atmospheric pressure to form cross-linkage and foam in said polyolefin and subjecting said thus treated sheet to embossing. 5. A method as claimed in claim 4, wherein said polyolefin involves a mixture of said polyolefin and at least one material selected from the group consisting of natural rubber, butyl rubber, polyisobutylene, polybutadiene, polyisoprene, styrene-butadiene rubber, acrylonitrile-butadiene-styrene resins, polystyrene, chlorinated polyethylene, chlorinated polypropylene and chlorosulfonated polyethylene. 6. A method as claimed in claim 4, wherein said cross-linking agent for polyethylene and the copolymers thereof is selected from the group consisting of dicumyl peroxide, 2,5-dimethyl-2, 5-di(tert.butyl-peroxy)hexane, di-tert.butylperterephthalate, tert.butyl hydroperoxide and di-tert.butyl peroxide. 7. A method as claimed in claim 4, wherein said cross-linking agent for polypropylene, polybutene-1 and the copolymers thereof is selected from the group consisting of 1,7-heptane-bis-sulfonazide, 1,10-decane-bis-sulfonazide, 4,4'' -diphenylmethane-bis-sulfonazide, polyethylene-sulfonazide, n-octadecyl azidoformate, phenyl-azidoformate, 2,2''oxyethylene-bis-azidoformate, 4,4'' -diphenyldiazide and m-phenylenediazide. 8. A method as claimed in claim 4, wherein said cross-linking agent is used in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the polyolefin. 9. A method as claimed in claim 4, wherein said cross-linking agent is used in an amount of 0.2 to 5 parts by weight based on 100 parts by weight of the polyolefin. 10. A method as claimed in claim 4, wherein said blowing agent is used in an amount of 1 to 10 parts by weight based on 100 parts by weight of polyolefin. 11. A method as claimed in claim 4, wherein said blowing agent is used in an amount of 2 to 5 parts by weight based on 100 parts by weight of polyolefin. 12. A method as claimed in claim 4, wherein said blowing agent is used together with an activator selected from the group consisting of zinc oxide, stearic acid salts, basic lead sulfate and urea compounds. 13. A method as claimed in claim 4, wherein the mixture of said blowing agent and said activator has a decomposition temperature of 10 to 30* C. higher than that of the cross-linking agent. 14. A method as claimed in claim 4, wherein said polyolefin composition is added with a moulding assistant selected from the group consisting of stearic acid, its salts, paraffin-wax, kerosene and liquid polybutene. 15. A method as claimed in claim 4, wherein said lining is selected from the group consisting of cotton, staple fiber, rayon, linen, polyvinyl alcohol, polyester, polyacrylonitrile, polyamide and glass fiber fabrics and their nonwoven fabrics, paper and metal foil. 16. A method as claimed in claim 4, wherein said composite sheet is heated at a temperature of 180-300* C. to effect cross-linking and foaming in one step. 17. A method as claimed in claim 4, wherein said composite sheet is heated at a temperature of 180-230* C. |
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