Preparation of polymeric materials disintegratable by ultraviolet light
    2.
    发明授权
    Preparation of polymeric materials disintegratable by ultraviolet light 失效
    紫外光可分解的聚合物材料的制备

    公开(公告)号:US3969432A

    公开(公告)日:1976-07-13

    申请号:US483763

    申请日:1974-06-27

    CPC分类号: C08F279/02 C08L25/10

    摘要: A process for preparing vinyl aromatic resin-, e.g. styrene-,based resinous materials to render them brittle and disintegratable upon prolonged exposure to ultraviolet light while retaining, in the absence of ultraviolet light, substantially the same appearance, processability and mechanical properties of conventional vinyl aromatic resin-based materials, comprising copolymerizing said vinyl aromatic monomer with from 0.5 to 6.0% of a conjugated diene monomer, e.g. isoprene, based on the total weight of the two monomers, initially copolymerizing said vinyl aromatic monomer with only a portion of the total amount of conjugated diene monomer and then completing the copolymerization with the remainder thereof, and the polymeric resin obtained by said process.

    摘要翻译: 乙烯基芳族树脂的制备方法,例如 苯乙烯基树脂材料,以在长时间暴露于紫外线下使其变脆和崩解,同时在不存在紫外线的同时保持常规乙烯基芳族树脂基材料的基本上相同的外观,加工性能和机械性能,包括将所述乙烯基 具有0.5至6.0%共轭二烯单体的芳族单体,例如 异戊二烯基于两个单体的总重量,首先使所述乙烯基芳族单体仅与共轭二烯单体总量的一部分共聚,然后与其余部分共聚合,以及通过所述方法获得的聚合物树脂。

    Process for producing fiber-glass reinforced plastics
    3.
    发明授权
    Process for producing fiber-glass reinforced plastics 失效
    生产玻璃纤维增​​强塑料的工艺

    公开(公告)号:US3968073A

    公开(公告)日:1976-07-06

    申请号:US393915

    申请日:1973-09-04

    摘要: A process for the production of glass-fiber reinforced plastics by partially copolymerizing a mixture of (A) 35-95% by weight methyl methacrylate, (B) 65-5% by weight of a vinyl aromatic hydrocarbon, and 0.2-5.0% by weight, based on the sum of (A) and (B) of a polymerizable compound containing two or more ethylenically unsaturated groups, discontinuing the partial copolymerization before gelation of said mixture has occurred, impregnating glass fibers with the resultant partially polymerized mixture and then curing the impregnated mixture.

    摘要翻译: 通过将(A)35-95重量%甲基丙烯酸甲酯,(B)65-5重量%的乙烯基芳烃和0.2-5.0重量%的乙烯基芳族烃的混合物部分共聚合制备玻璃纤维增​​强塑料的方法, 重量,基于含有两个或更多个烯键式不饱和基团的可聚合化合物的(A)和(B)之和,在凝胶化之前停止所述混合物的部分共聚之后,用得到的部分聚合的混合物浸渍玻璃纤维,然后固化 浸渍混合物。