申请人:OJI-YUKA SYNTHETIC PAPER CO., LTD.
公开号:EP0715953A2
公开(公告)日:1996-06-12
A uniaxially stretched multilayered film obtained by uniaxially stretching a laminated film at a stretch ratio of from 3 to 10 to form many closed fine voids in each layer, said laminated film comprising a base layer (A) made of a resin composition comprising resinous ingredients comprising from 50 to 90% by weight crystalline polyolefin (a) and from 50 to 10% by weight thermoplastic resin (b) having a lower melting point than the crystalline polyolefin (a) and an inorganic fine powder (c) in an amount of from 0 to 35% by weight based on the sum of the weight of the resinous ingredients and, formed on at least one side of said base layer (A), a surface layer (B) made of a resin composition comprising from 20 to 80% by weight inorganic fine powder (d) and from 80 to 20% by weight crystalline polyolefin (e), said uniaxially stretching being conducted at a temperature lower than the melting point of said crystalline polyolefin (a) and lower than the melting point of said crystalline polyolefin (e) but at a temperature higher than the melting point of said thermoplastic resin (b).
一种单轴拉伸多层薄膜,通过以 3 至 10 的拉伸比对层压薄膜进行单轴拉伸,在每层中形成许多封闭的细小空隙、所述层压薄膜包括由树脂成分制成的底层 (A),树脂成分包括重量百分比为 50% 至 90% 的结晶聚烯烃 (a)和重量百分比为 50% 至 10% 的热塑性树脂 (b),热塑性树脂 (b) 的熔点低于结晶聚烯烃 (a),以及无机微粉 (c),无机微粉 (c) 的重量百分比为 0% 至 35%,以树脂成分的重量总和为基准,且在所述底层(A)的至少一侧形成表层(B),该表层由一种树脂成分制成,该树脂成分包括 20% 至 80% (按重量计)的无机细粉(d)和 80% 至 20% (按重量计)的结晶聚烯烃(e),所述单轴拉伸是在低于所述结晶聚烯烃(a)熔点和低于所述结晶聚烯烃(e)熔点但高于所述热塑性树脂(b)熔点的温度下进行的。