Process for the preparation of an organopolysiloxane resin
    16.
    发明授权
    Process for the preparation of an organopolysiloxane resin 失效
    制备有机聚硅氧烷树脂的方法

    公开(公告)号:US5401821A

    公开(公告)日:1995-03-28

    申请号:US165788

    申请日:1993-12-13

    摘要: Process for the preparation of an organopolysiloxane resin, which comprisesin a first stage reacting at least one silane of the formulaR.sub.a Si(OR.sup.1).sub.4-a (I)in which a has a value of 0, 1, 2 or 3, R and R.sup.1 are monovalent organic radicals which may be the same or different and/or a partial hydrolyzate thereof, with the proviso that at least one silane of formula (I), where a is 0 or 1 and/or a partial hydrolyzate thereof is employed, and optionally an organo(poly)siloxane with water in the presence of a poly-protic acid and optionally other substances, subsequently partly neutralizing the acid by addition of a base and then distilling off at least some of the compound R.sup.1 OH formed,in a second stage reacting the homogeneous reaction mass resulting from the first stage in the presence of a base and a water-insoluble organic solvent and distilling off the water and the compound R.sup.1 OH,in a third stage, bringing the homogeneous reaction mass resulting from the second stage to a pH of between 6 and 8 by buffering with a poly-protic acid and/or salts thereof, distilling off the water and any compound R.sup.1 OH still present and filtering off the salt which has precipitated, andoptionally, in a fourth stage separating the homogeneous reaction mass resulting from the third stage from the water-insoluble organic solvent.

    摘要翻译: 一种制备有机聚硅氧烷树脂的方法,该方法包括在第一阶段使至少一种式RaSi(OR1)4-a(I)的硅烷反应其中a值为0,1,2或3,R和 R 1是可以相同或不同的一价有机基团和/或其部分水解产物,条件是使用至少一种式(I)的硅烷,其中a为0或1,和/或其部分水解产物, 和任选的有机(聚)硅氧烷与水在多质子酸和任选的其它物质的存在下,随后通过加入碱部分中和酸,然后在第二次蒸馏出至少一些所形成的化合物R 1 OH 在碱的存在和水不溶性有机溶剂的存在下使由第一阶段产生的均相反应物质反应,并在第三阶段中蒸馏除去水和化合物R1OH,使由第二阶段产生的均匀反应物质 pH在6 a之间 通过用聚 - 质子酸和/或其盐缓冲,蒸出水和仍存在的任何化合物R1OH,并过滤沉淀的盐,并且任选地在第四阶段中分离由 第三阶段来自水不溶性有机溶剂。