公开(公告)号：US4230654A

公开(公告)日：1980-10-28

申请号：US008106

申请日：1979-01-31

申请人： Mutsuo Kuga ,  Kiyoshi Kitagawa ,  Motoo Kawasaki ,  Junkichi Watanabe

发明人： Mutsuo Kuga ,  Kiyoshi Kitagawa ,  Motoo Kawasaki ,  Junkichi Watanabe

IPC分类号： B29C49/00 ,  B29C55/00 ,  B29C55/16 ,  B32B27/30 ,  C08J7/04 ,  B29C17/02 ,  B29D7/02

CPC分类号： C08J7/047 ,  C08J2329/04

摘要： A concurrent-biaxially drawn polyvinyl alcohol film is prepared by fabricating a molten hydrate polyvinyl alcohol into a film; drying it under preventing an orientation thereof to form a substantially non-orientated substrate film having a water content of 3 to 20 wt. %; coating an aqueous dispersion of a macromolecular compound on at least one surface of the substrate film to form a coated film having an average water content of 5 to 30 wt. % with an increased water content of 2 to 10 wt. %; concurrent-biaxially drawing the coated film at an area elongation percent of 600 to 1300% to form a drawn film; drying the drawn film under releasing stress at a water content of less than 3 wt. % to form a dried film; and heat-treating continuously the dried film at higher than 160.degree. C. and lower than a decomposition temperature for a short time.

摘要翻译： 通过将熔融水合物聚乙烯醇制成薄膜来制备同时双轴拉伸的聚乙烯醇薄膜; 在防止其取向以形成水含量为3至20重量％的基本上未取向的基底膜的情况下进行干燥。 ％; 在基材膜的至少一个表面上涂布高分子化合物的水性分散体，形成平均含水量为5〜30重量％的涂膜。 ％，水含量增加2至10wt。 ％; 以600〜1300％的面积伸长率同时双轴拉伸涂膜，形成拉伸膜; 在低于3重量％的含水量下在释放应力下干燥拉伸膜。 ％形成干膜; 并在短时间内将干燥膜连续热处理，温度高于160℃，分解温度低。