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    • 6. 发明授权
    • Three-layered polypropylene films
    • 三层聚丙烯薄膜
    • US4235365A
    • 1980-11-25
    • US80300
    • 1979-10-01
    • Toshiya YoshiiToshihiro YamaneYasuo Saito
    • Toshiya YoshiiToshihiro YamaneYasuo Saito
    • B32B7/02B32B27/32
    • B32B27/32Y10S383/908Y10T428/1334Y10T428/24967Y10T428/31913
    • This invention relates to a three-layered polypropylene film consisting of a core layer of biaxially oriented polypropylene sandwiched between ethylene-propylene copolymer layers having a different degree of molecular orientation, shown by birefringence, i.e., birefringence of one copolymer layer is different from that of the other copolymer layer. The film thus prepared has not only a good heat sealing property but also a good resistance against "hot-tack", "blocking", and "scratches". The film can be provided by a process wherein one copolymer layer is biaxially stretched, while the other copolymer layer is uniaxially stretched. Three-layered films of this invention are particularly suited for making bags with lap sealed parts, where lap sealing is a heat sealing method characterized by heat sealing one side of a film with the other side of the film.
    • 本发明涉及一种三层聚丙烯薄膜,其由夹层在具有不同分子取向度的乙烯 - 丙烯共聚物层之间的双轴取向聚丙烯芯层组成,双折射显示,即一个共聚物层的双折射不同于 另一共聚物层。 由此制备的膜不仅具有良好的热封性,而且具有良好的“热粘性”,“粘结”和“划痕”的抵抗性。 膜可以通过其中一个共聚物层被双轴拉伸的方法提供,而另一个共聚物层是单轴拉伸的。 本发明的三层膜特别适用于制造具有搭接密封部件的袋子,其中搭接密封是以膜的另一侧热封薄膜的一侧为特征的热封方法。
    • 9. 发明授权
    • Polyester film and magnetic recording medium therefrom
    • 聚酯薄膜和磁记录介质
    • US4590119A
    • 1986-05-20
    • US622771
    • 1984-06-20
    • Ken-ichi KawakamiToshiya YoshiiMasaru SuzukiHotsuma Okasaka
    • Ken-ichi KawakamiToshiya YoshiiMasaru SuzukiHotsuma Okasaka
    • G11B5/73G11B5/64G11B5/66
    • G11B5/7305Y10S428/90Y10T428/24967Y10T428/24975Y10T428/25Y10T428/254Y10T428/256Y10T428/257Y10T428/265Y10T428/31544Y10T428/31786
    • An oriented polyester film is provided according to the present invention which contains, per 100 parts by weight of a polyester,(A) 0.005-2 parts by weight of fine particles having average size of 0.05-3 .mu.m, and(B) 0.005-2 parts by weight of at least one compound selected from the group consisting of high aliphatic monocarboxylic acids having 10-33 carbon atoms and esters thereof.Herein also disclosed is a composite polyester film which comprises a resin layer of copolyester or copolyester ether containing an ester-forming alkali metal salt of sulfonic acid compound, the layer being laminated on at least one side of the oriented polyester film as a substrate. The present invention further provides a magnetic recording medium comprising the oriented polyester film or the composite polyester film as a base.The novel films of the present invention have a surface satisfying three properties: flatness, slipperiness and adhesion, which are considered unable to be attained with a conventional polyester film. Furthermore, a magnetic recording medium having good electromagnetic conversion and running properties can be obtained from the films in the invention.
    • 本发明提供一种取向聚酯膜,其含有100重量份的聚酯,(A)0.005-2重量份的平均粒径为0.05-3μm的微粒,(B)0.005 -2重量份的至少一种选自具有10-33个碳原子的高脂肪族单羧酸和其酯的化合物。 本文还公开了一种复合聚酯膜,其包含含有磺酸化合物的酯形成碱金属盐的共聚酯或共聚酯醚的树脂层,该层被层压在作为基材的取向聚酯膜的至少一面上。 本发明还提供一种包含定向聚酯膜或复合聚酯膜作为基底的磁记录介质。 本发明的新型薄膜具有满足以往的聚酯薄膜不能达到的三个特性:平坦性,滑溜性和粘着性的表面。 此外,可以从本发明的膜获得具有良好的电磁转换和运行特性的磁记录介质。