Production of copolymers of acrylonitrile and vinyl chloride
    31.
    发明授权
    Production of copolymers of acrylonitrile and vinyl chloride 失效
    生产丙烯腈和氯乙烯的共聚物

    公开(公告)号:US4334046A

    公开(公告)日:1982-06-08

    申请号:US95724

    申请日:1979-11-19

    CPC分类号: C08F214/06 C08F220/44

    摘要: The invention relates to a process for the production of a chemically uniform acrylonitrile vinyl chloride copolymer in an aqueous emulsion in the presence of a redox catalyst and with a fluctuating concentration of at least one iron salt in the reaction medium wherein the polymerization reaction is carried out at a pH value of from 2 to 6 in the presence of a mixture of an iron salt and a complex former, the complex former having certain apparent stability constants of the iron-II-complex and of the iron-III-complex.

    摘要翻译: 本发明涉及一种在氧化还原催化剂存在下在水性乳液中制备化学均匀的丙烯腈氯乙烯共聚物的方法,并且在反应介质中具有波动浓度的至少一种铁盐,其中进行聚合反应 在铁盐和络合物的混合物存在下,在2-6的pH值下,络合物具有铁-II-络合物和铁-III-络合物的一定表观稳定常数。

    Dental varnishes
    32.
    发明授权
    Dental varnishes 失效
    牙科清漆

    公开(公告)号:US4134935A

    公开(公告)日:1979-01-16

    申请号:US702904

    申请日:1976-07-06

    摘要: Graft copolymers or telomerisates made of polyisocyanates and a copolymer of methylmethacrylate bearing isocyanategroups or groups reactive with isocyanates can be employed as dental varnishes. They demonstrate high abrasion resistance, are quick drying and hardening, and possess excellent adhesion properties.

    摘要翻译: 可以使用由多异氰酸酯制成的接枝共聚物或调聚物和甲基丙烯酸甲酯带有异氰酸酯基团或与异氰酸酯反应的基团的共聚物作为牙科清漆。 它们表现出高耐磨性,快速干燥和硬化,并且具有优异的粘合性能。