Patent ID: 6730749
Filing Date: 2004-05-04
Classification: C08G

Abstract:
A siloxane block copolymer of the general average formula: wherein:A is independently selected from the group consisting of radical R1, radical E, a radical of the formula IIa â€ƒand a radical of the formula IIb B is radical of the formula IIa or IIb Y is the radical Y1 or the radical Y2 â€ƒwhere Y1 is the radical â€ƒand Y2 is the radical D is a radical of the formula R1 is an alkyl radical having 1 to 30 carbon atoms, a substituted alkyl radical, an optionally substituted aryl radical or an optionally substituted alkaryl radical, where however at least 80% of the radicals R1 are methyl groups, a has a value from 3 to 200, b has a value from 0 to 50, c has a value from 0 to 10, d has a value from 0 to 5 and e has a value from 0 to 4, where the values for a, b, c, d and e in the individual segments Z of the radicals A, B and D may be different, E is a radical which a) is a radical of the general formula â€”Rf2â€”Oâ€”(CmH2mOâ€”)nR3 in which R2 is a divalent alkyl radical which may also be branched and f has a value of 0 or 1, m has a value of, on average, from 2 to 4, n has a value from 0 to 100 and R3 is a hydrogen radical, an optionally substituted alkyl radical having 1 to 6 carbon atoms, an acyl radical or a â€”COâ€”NHâ€”R4 radical in which R4 is an optionally substituted alkyl or aryl radical, and/or b) has the meaning of an epoxy-functionalized alkyl substituent optionally containing hetero atoms, and/or c) has the meaning of a mono-, di- and trihydroxyalkyl substituent which may also be aromatic or branched and partially or completely etherified or esterified, and/or d) has the meaning of a halogen- or pseudohalogen-substituted alkyl, aryl or aralkyl radical which optionally may also be branched, X is a polyvalent organic radical, with the proviso that at least one radical of the formula IIa or IIb is present in the molecule and at least two of the segments Z are different in which the linked siloxane copolymer blocks differ by more than 20% a) in the average number of silicon atoms; b) in their polarities; c) in their hydrophilic/hydrophobic balance; or d) in their proportion of reactive groups, and where the silicone block copolymer has &lE;600 Si atoms.