Patent ID: 6074588
Filing Date: 2000-06-13
Classification: B29C,C10M,C10N

Abstract:
A method of improving mold releasability, which comprises a step of applying a mold releasing agent to a mold, wherein the mold releasing agent consists of(A) a silicon-containing compound represented by the formula (I):R.sup.1.sub.n SiR.sup.2.sub.4-n (I)wherein each R.sup.1 is the same and is ##STR83## where R.sup.3 and R.sup.4 are a hydrocarbon group having 1 to 4 carbon atoms, respectively, R.sup.2 is a hydrocarbon group having 1 to 4 carbon atoms or a halogenated hydrocarbon group having 1 to 4 carbon atoms, n is 3 or 4,(B) is a fluorine-containing compound which has at least two hydroxyl groups or alkoxyl groups in one molecule and is at least one selected from the group consisting ofa copolymer having a number average molecular weight of not less than 1,000 and containing, as copolymerizing components,a compound represented by the formula (III):RfA.sup.4 A.sup.5wherein Rf is a perfluoroalkyl group having 6 to 21 carbon atoms, A.sup.4 is an alkylene group having 1 to 6 carbon atoms, A.sup.5 is represented by ##STR84## in an amount of not less than 20% by weight and a compound represented by the formula (IV):A.sup.6 OA.sup.7 A.sup.8 (IV)wherein A.sup.6 is a hydrogen atom, A.sup.7 is an alkylene group having 1 to 6 carbon atoms, A.sup.8 is represented by ##STR85## in an amount of not less than 2% by weight, a compound represented by the formula (VI):Y.sup.1 OCH.sub.2 R.sup.16 O--R.sup.18 --R.sup.17 CH.sub.2 OY.sup.2(VI)wherein Y.sup.1 and Y.sup.2 are hydrogen atoms, R.sup.16 is--CF.sub.2 --, --CF.sub.2 CF.sub.2 --, or ##STR86## R.sup.17 is --CF.sub.2 --, --CF.sub.2 CF.sub.2 --, or ##STR87## R.sup.18 is at least one structural unit selected from the group consisting of .paren open-st.CF.sub.2 O.paren close-st..sub.s.spsb.1, .paren open-st.CF.sub.2 CF.sub.2 O.paren close-st..sub.s.spsb.2 and .paren open-st.R.sup.19 O.paren close-st..sub.s.spsb.3,R.sup.19 is ##STR88## or --CF.sub.2 CF.sub.2 CF.sub.2 --, s.sup.1 +s.sup.2 +s.sup.3 is not less than 5 in average, and a compound represented by the formula (VII):RfA.sup.1 Si(OA.sup.2).sub.s.spsb.6 A.sup.3.sub.3-s.spsb.6 (VII)wherein Rf is a perflouroallyl group having 6 to 21 carbon atoms, A.sup.1 is an alkylene group having 2 to 6 carbon atoms, A.sup.2 is hydrogen atom or an alkyl group having 1 to 4 carbon atoms, A.sup.3 is an alkyl group having 1 to 4 carbon atoms, s.sup.6 is 2 or 3,(C) a solvent and(D) a curing accelerator,and a weight ratio of the silicon-containing compound (A) to the fluorine-containing compound (B) is 1/99 to 80/20.