| 摘要 |
PURPOSE:To obtain a strippable compsn. which has good long-term stability and can form a strippable film which requires only a low peeling force, by blending two specific polyorganosiloxanes with a platinum catalyst. CONSTITUTION:A strippable compsn. contains the following components A, B and C. The component A is a polyorganosiloxane having viscosity not lower than 20cp at 25 deg.C, composed of a unit of formula I, a unit of R2SiO and 0.5-20mol.% of a unit of formula II (wherein x is an alkenyl; R g roups of each unit are the same or different and each is a monovalent hydrocarbon group and at least 80% of the sum of the R groups are methyl; a is 0-3; at least one alkenyl group is present in the molecule). The component B is a polyorganosiloxane having H reactive with the alkenyl group in the component A. The components A and B are used in a molar ratio of the reactive H to the alkenyl group of 0.5-5.0. The component C is a platinum catalyst for accelerating the reaction between the components A and B. |
