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11. 发明授权

US3457204A Self-extinguishing thermoplastic compositions 失效
公开(公告)号：US3457204A
公开(公告)日：1969-07-22
申请号：US3457204D
申请日：1966-07-08
申请人： BASF AG
发明人： BURGER HEINZ , DAUMILLER GUENTHER , GROHMANN JOHANNES , KASTNING ERNST-GUENTHER , WEBER HEINZ , WILLERSINN HERBERT
IPC分类号： C08J9/00 , C08K5/00 , C08K5/02 , C08L25/04 , C08L65/00 , C08F31/04 , C08F47/08
CPC分类号： C08J9/0095 , C08J2325/04 , C08K5/00 , C08K5/02 , C08L25/04 , C08L25/16 , C08L25/18 , C08L65/00 , Y10S521/907 , C08L2666/04
摘要： 1,146,653. Self-extinguishing polymeric compositions. BADISCHE ANILIN- & SODAFABRIK A.G. 7 July, 1966 [9 July, 1965], No. 30552/66. Headings C3C and C3P. A self-extinguishing composition consists of (a) a normally solid thermoplastic polymer of at least 50% by wt. of styrene which may be substituted, and less than 50% of at least one other copolymerizable compound having the group having intimately incorporated therewith (b) an organic bromide, having a plurality of bromine atoms attached to carbon atoms and the bromine atoms constituting more than 40% of the bromide, in such an amount that the composition has a bromine content of 0À1-5%, and (c) 0À01-5% of (a) of a polymer which is prepared from (i) a compound of formula where R 1 , R 2 , R 4 and R 5 are H, halogen or a C 1-4 aliphatic hydrocarbon radical and at least two of the above Rs are where R 7 is a C 1-4 linear aliphatic hydrocarbon radical and R 8 is H or R 7 , and R 3 and R 6 are H or halogen atoms; or (ii) a mixture of the above compounds and a compound of the same formula where R 1 is where R 7 and R 8 are as before and the remaining Rs are H or halogen atoms. The (a) polymer may be polystyrene, a copolymer of styrene and acrylonitrile together with optionally polybutadiene, or a polymer obtained by polymerizing styrene in the presence of polybutadiene. Polymer (c) may be prepared by dehydropolymerization of p- or m-diisopropylbenzene with optionally isopropylbenzene, or 1,2,4-tri- or 1,2,4,5-tetra-isopropylbenzene. The bromide (b) may be hexabromocyclododecane or tris - (2,3 - dibromopropyl) - phosphate. The composition may be made by dissolving the three components in methylene chloride or by extruding the three components, with optionally kaolin; or by polymerizing styrene in the presence of an aq. mixture of polyvinylpyrrolidone, sodium pyrophosphate, benzoyl peroxide and the above (b) and (c) components. The composition may also contain a foaming agent, e.g. pentane or methyl chloride, and may be formed into a foamed sheet or strand.

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