Patent ID: 8695752
Filing Date: 2014-04-15
Classification: C08G,C08J,H04R

Abstract:
1. A deep-drawn membrane formed of a polyester or polycarbonate film, wherein the polyester comprises a structural unit of the formula (I), and a structural unit of the formula (II) wherein R 1 and R 2 independently of each other represent halogen, C1-C8 alkyl, C5-C6 cycloalkyl, C6-C10 aryl, C7-C12 aralkyl or hydrogen and R 3 corresponds to the following formula (A) or wherein the polycarbonate comprises a structural unit of the formula (I), and a structural unit of the formula (II) wherein R 1 and R 2 independently of each other represent halogen, C1-C8 alkyl, C5-C6 cycloalkyl, C6-C10 aryl, C7-C12 aralkyl or hydrogen and R 3 corresponds to a carbonyl group and the deep-drawn membrane is used for acoustic signal converters.