Patent ID: 6309577
Filing Date: 2001-10-30
Classification: B28B,C04B

Abstract:
A process for simultaneously moulding in a mould having an interior and rendering water-repellent moulded components made of concrete, mortar, or cement comprising the steps of:covering the interior of the mould before pouring the concrete, mortar, or cement, with a composition comprising a resin which is a silicone copolymer of following formula (I):M.sub..alpha. D.sub..beta. T.sub..gamma. Q.sub..delta. (OR).sub..epsilon. (I)whereinM=R.sup.1 R.sup.2 R.sup.3 SiO.sub.1/2D=R.sup.4 R.sup.5 SiO.sub.2/2T=R.sup.6 SiO.sub.3/2Q=SiO.sub.4/2R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6, which are identical to or different from one another, each represent a C.sub.1 -C.sub.12 hydrocarbon-comprising residue;R is a hydrogen atom or a linear or branched C.sub.1 -C.sub.4 alkyl radical;the .alpha., .beta., .gamma. and .delta. symbols represent the molar fractions (or the proportion by number) of the silicon atoms respectively of M, D, T and Q types for one silicon atom; the .epsilon. symbol represents the molar fraction (or the proportion by number) of the (-).sub.3 SiOR ends per silicon atom; these symbols varying within the following ranges:.alpha.: 0-0.5.beta.: 0-0.95.gamma.: 0-0.9.delta.: 0-0.8.epsilon.: 0.05-2with the proviso that .alpha.+.beta.+.gamma.+.delta.=1, and that the copolymer exhibits, in its structure, at least one T or Q unit; andin the absence of crosslinking agent of hydrolysable silane and of curing catalyst in the composition.