| 摘要 |
The invention relates to a composition containing the following components in a physiologically acceptable medium, namely: a) a siloxane resin comprising at least 80 mole % of units (i) (R'3Si01/2)a and (ii) (SiO4/2)b, wherein R' represents independently an alkyl group having between 1 and 8 carbon atoms, an aryl group, a carbinol group or an amino group, provided that at least 95 mole % of the R' groups are alkyl groups, a and b have values strictly greater than 0 and the a/b ratio is between 0.5 and 1.5; b) a propyl silsesquioxane resin comprising at least 80 mole % of (R"SiO3/2) units, wherein R" represents independently an alkyl group having between 1 and 8 carbon atoms, an aryl group, a carbinol group or an amino group, provided that at least 80 mole % of the R" groups are propyl groups, whereby the weight ratio between resins (a) and (b) is between 1/99 and 99/1, in particular between 85/15 and 15/85, resins (a) and (b) are not linked by covalent bonds and the number of units M in the final mixture is strictly less than the number of units (T+Q); and c) at least one polycondensate which can be obtained by reacting: between 10 and 30 wt.-%, in relation to the total weight of the polycondensate, of at least one polyol having 3 to 6 hydroxyl groups; between 30 and 80 wt.-%, in relation to the total weight of the polycondensate, of at least one linear, branched and/or cyclic, saturated or unsaturated non-aromatic monocarboxylic acid having 6 to 32 carbon atoms; between 0.1 and 10 wt.-%, in relation to the total weight of the polycondensate, of at least one aromatic monocarboxylic acid having 7 to 11 carbon atoms, which may also be optionally substituted by 1 to 3 linear, branched and/or cyclic, saturated or unsaturated alkyl radicals having 1 to 32 carbon atoms; between 5 and 40 wt.-%, in relation to the total weight of the polycondensate, of at least one linear, branched and/or cyclic, saturated or unsaturated aromatic polycarboxylic acid having at least 2 COOH carboxylic groups, in particular 2 to 4 COOH groups; and/or a cyclic anhydride such as a polycarboxylic acid. |
