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    • 9. 发明授权
    • Film having fine voids and manufacture thereof
    • 薄膜具有细小的空隙及其制造
    • US6004664A
    • 1999-12-21
    • US110825
    • 1998-07-06
    • Yasushi SasakiKen-ichi MoriKatsuya ItoToshitake Suzuki
    • Yasushi SasakiKen-ichi MoriKatsuya ItoToshitake Suzuki
    • C08J5/18C08L23/02C08L25/08C08L67/02B32B27/06
    • C08J5/18C08L67/02C08J2367/02C08L23/02C08L25/08Y10S428/91Y10T428/249975Y10T428/249978Y10T428/249979
    • A polyester film having fine voids, which comprises a polymer mixture comprising a polyester resin and a thermoplastic resin (B) incompatible with said polyester resin, and which has an apparent specific gravity of 0.6-1.3 and an inplane birefringence as determined from the equation:inplane birefringence=refractive index along lengthwise principal axis-refractive index along crosswise principal axis,of from -0.02 to +0.04, and manufacture thereof. A thermoplastic resin film having fine voids, which comprises a polymer mixture comprising a thermoplastic resin (A) and a thermoplastic resin (B) incompatible with said thermoplastic resin (A), and which has a ratio (L1/L2) of an average length (L1) of the voids at a cross section in the lengthwise direction of the film, to an average length (L2) of the voids at a cross section in the direction forming a right angle with said lengthwise direction, i.e., crosswise direction of the film, of 2/3-3/2, a thickness variation of the film of not more than 5%, and a void content of 5-50% by volume, and manufacture thereof. The polyester film having fine voids of the present invention has an extremely superior isotropy, excellent tear resistance, extremely superior water resistance, moisture absorption, dimensional stability, surface stability, gloss and vividness of printed matters, and mechanical strength, which have been particularly achieved by making apparent specific gravity and inplane birefringence fall within a specific range mentioned above. The thermoplastic resin film having fine voids of the present invention suffers less from curling by heat, which has been achieved by making (L1/L2), thickness variation and void content fall within a specific range mentioned above.
    • 一种具有微细空隙的聚酯膜,其包含聚酯混合物,其包含聚酯树脂和与所述聚酯树脂不相容的热塑性树脂(B),并且其表观比重为0.6-1.3,并且由下式确定的面内双折射: 平面双折射率=沿着横向主轴的纵向主轴折射率的折射率为-0.02至+0.04,并且其制造。 一种具有微细空隙的热塑性树脂膜,其包含含有热塑性树脂(A)和与所述热塑性树脂(A)不相容的热塑性树脂(B))的聚合物混合物,其具有平均长度(L1 / L2) (L1)在膜的长度方向上的截面处的空隙的长度方向,与沿着所述长度方向成直角的方向的截面的空隙的平均长度(L2),即 膜的2 / 3-3 / 2,膜的厚度变化不大于5%,空隙含量为5-50体积%,并且其制造。 具有本发明的微细空隙的聚酯膜具有非常优异的各向同性,优异的抗撕裂性,特别优异的耐水性,吸湿性,尺寸稳定性,表面稳定性,印刷物的光泽和鲜艳度以及机械强度。 通过使表观比重和面内双折射落入上述特定范围内。 本发明的具有微细空隙的热塑性树脂薄膜通过使(L1 / L2),厚度变化和空隙率落在上述特定范围内而实现的热量卷曲不足。