公开(公告)号：WO2017174682A1

公开(公告)日：2017-10-12

申请号：PCT/EP2017/058160

申请日：2017-04-05

Applicant: KURARAY EUROPE GMBH

Inventor： STEUER, Martin Dr. ,  WENZLIK, Daniel Dr.

IPC: B32B27/22 ,  B32B27/30 ,  B32B17/10 ,  C08F8/00

Abstract: The invention is directed to a multilayer film comprising at least one first and one second layer of plasticized polyvinyl acetal characterised in that the first layer comprises a first plasticizer and a first polyvinyl acetal with a degree of acetalization of 75.1- 84.0 mol % and a molar ratio of the amount of continuous sequences of vinyl alcohol groups with 5 members with a stereochemical sequence of rrrr of more than 0,23 based on the total amount of continuous syndiotactic sequences of vinyl alcohol groups with 3 members in the polyvinyl acetal and the second layer comprises a second plasticizer and a second polyvinyl acetal with a degree of acetalization of 60 - 84 mol %.

Abstract translation: 本发明涉及包含至少一个第一和第二增塑聚乙烯醇缩醛层的多层膜，其特征在于第一层包含第一增塑剂和第一聚乙烯醇缩醛，其缩醛化程度为 75.1-84.0摩尔％，连续顺序乙烯醇基团与具有立构化学顺序rrrr大于0.25的5个成员的连续顺序的量的摩尔比，基于3个成员的乙烯醇基团的连续间同立构序列的总量 在聚乙烯醇缩醛中，第二层包含第二增塑剂和缩醛化度为60-84摩尔％的第二聚乙烯醇缩醛。