The invention relates to methods for producing crosslinked polyvinyl acetals, according to which a polyvinyl alcohol (A1) containing carboxyl groups is crosslinked by (i) reacting the polymer (A1) with at least one polyaldehyde of formula R
9
(CHO)
n
, and (ii) at least partly esterifying groups of formula (1) and formula (4a) with each other, said steps being performed in any order. The invention further relates to methods for producing crosslinked polyvinyl acetals, according to which a polyvinyl alcohol (A2) is crosslinked by (i) reacting the polymer (A2) with at least one compound of formula (6), (ii) adding at least one compound of formula (4b), (iii) adding a polyaldehyde of formula (5), and (iv) at least partly esterifying groups of formula (1) and structural units derived from the compound of formula (4b) with each other, the radicals R
7
, R
8
, R
9
, R
10
, and R
11
, and the index n being defined as indicated in the description. Also disclosed are the crosslinked polyvinyl acetals obtained by means of the inventive method and particularly appropriate areas of application of said polymers.
本发明涉及生产交联聚
乙烯醇的方法,根据该方法,含有羧基的聚
乙烯醇 (A1) 通过以下方式交联:(i) 使
聚合物 (A1) 与至少一种式 R 的聚醛反应;(ii) 使
聚合物 (A1) 与至少一种式 R 的聚醛反应;(iii) 使
聚合物 (A1) 与至少一种式 R 的聚醛反应。
9
(CHO)
n
和 (ii) 至少部分地将式 (1) 和式 (4a) 的基团相互
酯化,上述步骤可以任意顺序进行。本发明还涉及生产交联聚
乙烯醇的方法,根据该方法,聚
乙烯醇 (A2) 通过以下步骤交联:(i) 使
聚合物 (A2) 与至少一种式 (6) 的化合物反应;(ii) 加入至少一种式 (4b) 的化合物;(iii) 加入一种式 (5) 的聚醛;(iv) 至少部分地使式 (1) 的基团和源自式 (4b) 的化合物的结构单元相互
酯化,自由基 R
7
, R
8
, R
9
, R
10
和 R
11
指数 n 的定义如说明所示。此外,还公开了通过本发明方法获得的交联聚
乙烯醇缩醛,以及上述
聚合物的适当应用领域。