| 摘要 |
PURPOSE:To form dust protective film excellent in protection for contamination and capable of being painted with organic paint or ink, by coating the surface of silicon elastomer with the composition consisting mainly of specifically designed poly(metha)acrylate and volatile organic silicon compound. CONSTITUTION:Polymer A is the solution polymer of (metha)acrylate shown by formula I (R<1> is alkyl radical higher than C4; R<2> is H or CH3) and has molecular weight of 500-500,000. Volatile organic silicon compound B is shown by formulas II, III or IV (R<3>-R<8> is H or alkyl radical, n is zero or a positive integer, n is an integer 3 or more) and has boiling point within the range of 70-250 deg.C under normal pressure. The objective compound substantially consists of the solution of the polymer A and the silicon compound B, and the sum of the weight WA of the polymer A and the weight WB of the compound B is defined to be 0.1-80wt% of total material and the ratio of WB to (WA+WB) is 5wt% or more. The surface of silicon elastomer is coated with said composition and dried. |
