| 摘要 |
1,125,382. Graft polymer blends. GOODYEAR TIRE & RUBBER CO. 8 Sept., 1965 [11 Sept., 1964], No. 38319/65. Heading C3G. A transparent impact-resistant polymer composition comprises a partly compatible blend of (A) a clear, resinous polymer or copolymer of methyl methacrylate, styrene, alpha-methylstyrene, ethyl methacrylate, t.-butyl methacrylate and acrylonitrile, either alone or with one another, in which in a copolymer the ratio of one monomer to another monomer is from 95: 5 to 5: 95 and (B) a clear, rubbery copolymer prepared by the copolymerization of at least 2 of the monomers n-octyl acrylate, n-octyl methacrylate, methyl methacrylate, 2-ethylhexyl acrylate, n-butyl acrylate, n-propyl acrylate, isobutyl acrylate, ethyl acrylate, nhexyl acrylate, n-hexyl methacrylate, tetradecyl methacrylate, n-decyl methacrylate, butadiene, isoprene, styrene or alpha-methyl styrene, wherein the ratio of one monomer to another is from 50: 5 to 50: 95, the compatibility of the resinous polymer with the rubbery polymer being adjusted by modifying one of the said polymers by means of a clear, grafting polymer grafted to said one polymer, the grafting polymer being a clear copolymer resulting from the polymerization of a mixture of at least 2 monomers selected from the group used in making the said resinous and the said rubbery polymers or a clear homopolymer of one of the said monomers, the clear grafting polymer having substantially the same solubility parameter as the non-modified polymer, the modified polymer having a refractive index substantially the same as the refractive index of the non-modified polymer and the grafting polymer being present in an amount sufficient to adjust the compatibility of one polymer for the other polymer to produce said polymer composition having a flex modulus of at least 170,000 p.s.i.g., a Shore D hardness of at least 70, a tensile strength of at least 2000 p.s.i.g., a clarity in terms of white light transmission efficiency of at least 85%, a haze value of not more than 20, a heat distortion of at least 70‹ C. measured at 264 p.s.i.g. and a notched Izod impact strength of at least 6 inch lbs., wherein the ratio of modified polymer to non-modified polymer is between 1: 1 and 5: 1. In Examples III to VI and VIII to XIII, methyl methacrylate is grafted on to a butadiene-methyl methacrylate rubber, in Example XIV said methacrylate is grafted on to an isoprene - butadiene - methyl methacrylate rubber and in Example XV on to an isoprenemethyl methacrylate rubber, the resulting latices being cocoagulated with a methyl methacrylate-styrene copolymer latex. In Table 3 are listed further combinations of grafted rubbers with resins. |
