申请人:GENCORP INC.
公开号:EP0612786A1
公开(公告)日:1994-08-31
A block copolymer of generally an AB, ABA, or A(BA)n structure, or mixtures thereof where the A block is an unsaturated polyester, the B block is a flexible polymer having a Tg of 0oC or lower, and n is 2 to 5. The various block components are generally first separately prepared as polymers with the flexible polymer generally having 1 or 2 functional end groups such as an amine group, a carboxyl group, or a hydroxyl group with the later being preferred. Alternatively, for low molecular weight unsaturated polyester blocks, the block can be made in situ. The preferred reaction route is to react a mono or dihydroxy terminated flexible polymer with a diisocyanate which subsequently can be readily reacted with the polyester. The block copolymers can be utilized as toughening agents. They furthermore can be utilized to coat a fiber structure such as individual fibers, a woven structure, or a nonwoven structure such as mats, rovings, bundles, and the like, with the coated fiber structures subsequently incorporated into a polymeric matrix such as polyester.
一般为 AB、ABA 或 A(BA)n 结构的嵌段共聚物或其混合物,其中 A 嵌段为不饱和聚酯,B 嵌段为 Tg 为 0oC 或更低的柔性聚合物,n 为 2 至 5。各种嵌段组分一般首先分别制备成聚合物,柔性聚合物一般具有 1 或 2 个官能团,如胺基、羧基或羟基,以羟基为佳。另外,对于低分子量的不饱和聚酯嵌段,也可以就地制造。首选的反应路线是将单羟基或二羟基端基柔性聚合物与二异氰酸酯反应,二异氰酸酯随后很容易与聚酯反应。嵌段共聚物可用作增韧剂。此外,它们还可用于涂覆纤维结构,如单根纤维、编织结构或非编织结构,如毡、粗纱、纤维束等,涂覆的纤维结构随后可与聚酯等聚合物基体结合。