Patent ID: 7754778
Filing Date: 2010-07-13
Classification: C08G

Abstract:
1. Linear polydimethylsiloxane-polyoxyalkylene block copolymers containing Si—C groups and carboxylic ester groups and having repeating (A 1 BA 2 B) units where A 1 and A 2 are two different polydimethyl-siloxane units of the general formula (I) with a number of Si atoms N=(n+2) of 15≦N≦30 and N and B is a unit of the formula (II) where R independently at each occurrence is H, —CH a and b independently of one another are 0 to 20, c and d independently of one another are values≧1, e is 0 or 1, D is a hydrocarbon radical having 2 to 10 carbon atoms, the overall molar weight of the unit of the formula II being from 600 to 10000 g/mol, with the proviso that the average mixed molar weight of the polydimethylsiloxane units (A