Polysiloxane urethane compounds and adhesive compositions, and method of making and using the same
申请人:LOCTITE CORPORATION
公开号:EP0239228A2
公开(公告)日:1987-09-30
Silicone urethane compounds, e.g., a polysiloxane urethane (meth)acrylate, obtained as a reaction product of a polysiloxane carbinol, a polyisocyanate, and a polyfunctional compound having at least one functional group which is reactive with an isocyanate group of the polyisocyanate and after reaction therewith provides an ethylenic functional group in the reaction product. The polysiloxane carbinol has a molecular weight of from about 5,000 to about 50,000 and has RʹOH end groups wherein Rʹ is linear C₄-C₂₀ alkylene. Such carbinol may be obtained as a reaction product of the corresponding hydride-terminated polysiloxane and a linear C₄-C₂₀ ω-alkenyl alcohol. The hydride-terminated polysiloxane in turn may be obtained as a reaction product of either (i) the corresponding silanol of molecular weight at least 10,000 and a hydridosilane having one or more hydrolyzable groups attached to the silicon atom, or (ii) a cyclosiloxane and a 1,3-dihydrido disiloxane.
The disclosed compounds may be utilized in adhesive compositions for substrates including bonding surfaces such as glass, and polymers and copolymers of ethylenically unsaturated monomers. The bonding of such substrates may suitably be carried out at least partially under anoxic conditions, e.g., with elevated temperature and/or actinic radiation curing of the bonding composition in a substantially oxygen-free environment. A preferred vacuum degassing/anoxic curing process is disclosed for such bonding compositions, which is particularly advantageous for difficult to bond substrates, such as low density polyethylene.
硅酮聚氨酯化合物,例如聚硅氧烷聚氨酯(甲基)丙烯酸酯,由聚硅氧烷甲醇、多异氰酸酯和多官能团化合物的反应产物获得,多官能团化合物具有至少一个官能团,该官能团与多异氰酸酯的异氰酸酯基反应,并在与之反应后在反应产物中提供乙烯基官能团。聚硅氧烷甲醇的分子量约为 5000 至 50000,具有 RʹOH 末端基团,其中 Rʹ 为线性 C₄-C₂₀ 亚烷基。这种醇可以作为相应的氢化物封端聚硅氧烷和线性 C₄-C₂₀ ω-烯醇的反应产物获得。氢化物封端聚硅氧烷反过来可以作为以下两种物质的反应产物获得:(i) 分子量至少为 10,000 的相应硅烷醇和硅原子上连接有一个或多个可水解基团的氢化物硅烷;或 (ii) 环硅氧烷和 1,3-二氢二硅氧烷。
所公开的化合物可用于基材的粘合剂组合物中,包括玻璃等粘合表面,以及乙烯基不饱和单体的聚合物和共聚物。此类基材的粘合至少可部分地在缺氧条件下进行,例如,在基本无氧的环境中通过升高温度和/或放热辐射固化粘合组合物。对于此类粘合组合物,已公开了一种优选的真空脱气/缺氧固化工艺,该工艺对于难以粘合的基材(如低密度聚乙烯)尤其有利。