Liquid organopolysiloxane resins, a process for their preparation, low
viscosity polydiorganosiloxane compositions containing liquid
organopolysiloxane resins and their use
    12.
    发明授权
    Liquid organopolysiloxane resins, a process for their preparation, low viscosity polydiorganosiloxane compositions containing liquid organopolysiloxane resins and their use 失效
    液体有机聚硅氧烷树脂,其制备方法,含有液体有机聚硅氧烷树脂的低粘度聚二有机硅氧烷组合物及其用途

    公开(公告)号:US5932668A

    公开(公告)日:1999-08-03

    申请号:US700896

    申请日:1996-08-21

    摘要: Novel liquid organopolysiloxane resins of the average composition �R.sup.1 Si(CH.sub.3).sub.2 O.sub.1/2 !.sub.a �(CH.sub.3).sub.3 SiO.sub.1/2 !.sub.b �R.sup.2 O.sub.1/2 !.sub.c �R.sup.1 Si(CH.sub.3)O!.sub.d �(CH.sub.3).sub.2 SiO!.sub.e �SiO.sub.2 !,whereinR.sup.1 is a C.sub.2 -C.sub.8 -alkenyl group,R.sup.2 is an optionally substituted, linear or branched C.sub.1 -C.sub.8 -alkyl group or a mixture thereof,a+b+c+d+e is about 1 to 6,d+e is about 0 to 3,the resin has a viscosity of 0.1 to 1000 Pas at 25.degree. C., andthe alkenyl or vinyl content of the resin is in the range of 0.4 to 4 mmol/g,and their preparation by reacting at least one of tetraalkoxysilane and its partial hydrolyzate with at least one organosiloxane and a strong acid as catalyst in the presence of water and optionally an organic solvent at a temperature of about >40.degree. C. They are formulated into novel low viscosity polydiorganosiloxane compositions.

    摘要翻译: 具有平均组成[R1Si(CH3)2O + E,fra1 / 2 + EE] a [(CH3)3SiO + E,fra1 / 2 + EE] b [R2O + E,fra 1/2]的新型液体有机聚硅氧烷树脂 + EE] c [R 1 Si(CH 3)O] d [(CH 3)2 SiO] e [SiO 2],其中R 1是C 2 -C 8 - 烯基,R 2是任选取代的直链或支链C 1 -C 8烷基或 其混合物,+ b + c + d + e为约1〜6,d + e约为0〜3,树脂在25℃下的粘度为0.1〜1000Pa·s,烯基或乙烯基含量 的树脂在0.4〜4mmol / g的范围内,并且通过使四烷氧基硅烷及其部分水解产物中的至少一种与至少一种有机硅氧烷和强酸作为催化剂在水和任选的有机溶剂的存在下反应而制备 在约> 40℃的温度下,将它们配制成新的低粘度聚二有机硅氧烷组合物。