The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 13, 2010
Filed:
Jul. 25, 2008
Wilfried Knott, Essen, DE;
Oliver Thum, Ratingen, DE;
Klaus-dieter Klein, Muelheim, DE;
Dagmar Windbiel, Essen, DE;
Claudia Hierath, Essen, DE;
Wilfried Knott, Essen, DE;
Oliver Thum, Ratingen, DE;
Klaus-Dieter Klein, Muelheim, DE;
Dagmar Windbiel, Essen, DE;
Claudia Hierath, Essen, DE;
Evonik Goldschmidt GmbH, Essen, DE;
Abstract
The invention provides linear polydimethylsiloxane-polyoxyalkylene block copolymers containing Si—C groups and carboxylic ester groups and having repeating (ABAB) units where Aand Aare two different polydimethylsiloxane units of the general formula (I) with a number of Si atoms N=(n+2) of 15≦N≦30 and N≠Nand B is a unit of the formula (II) —CH—CH—(CH)—CO[O—CH—CH(R)]—O-[D-O]—[—CH—CH(R)—O]—OC—(CH)—CH—CH— (II) where R independently at each occurrence is H, —CHor —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 and D is a hydrocarbon radical having 2 to 10 C atoms, the overall molar weight of the unit of the formula II being from 600 to 10 000 g/mol, with the proviso that the average mixed molar weight of the polydimethylsiloxane units (A+A) is from >1665 to <1998 g/mol and the fraction of [O—CH—CH(R)] with R═H is >0% to ≦50% by weight, based on the overall weight of [O—CH—CH(R)] in B, a process for preparing them and their use.