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    • 12. 发明授权
    • Degradable monofilament and preparation process thereof
    • 可降解单丝及其制备方法
    • US6090910A
    • 2000-07-18
    • US984538
    • 1997-12-03
    • Hosei ShinodaMasanobu Ajioka
    • Hosei ShinodaMasanobu Ajioka
    • A61L17/12D01F6/84C08G63/08A61L17/00C08G63/88D02J1/22
    • D01F6/84A61L17/12
    • A degradable copolymer filament comprising an internal structure having the following separate phases: (a) a matrix phase comprised as a primary component of a polymer segment which exhibits a tensile Young's modulus of 2 GPa or less and a strength retention of 50% or more after two weeks in water at 37.degree. C., pH 7.3, and (b) a micro-dispersed phase comprised as a primary component of a polymer segment which exhibits a tensile strength of 200 MPa or more and a strength reduction greater than the matrix phase in water at 37.degree. C., pH 7.3. The weight ratio of each component in the matrix phase and dispersed phase is 50:50 to 95:5, respectively, and the dispersed phase a needle structure oriented by stretching in the fiber direction. A degradable monofilament having an excellent mechanical strength and flexibility, moderate hydrolyzability, high ligature stability and being suitable as a material of surgical absorbable suture can be obtained. A preparation process is also provided.
    • 一种可降解共聚物长丝,其包含具有以下分离相的内部结构:(a)基质相,其包含作为聚合物链段的主要组分,其显示出2GPa或更小的拉伸杨氏模量和50%以上的强度保持率 在37℃,pH7.3的水中两周,和(b)包含作为聚合物链段的主要组分的微分散相,其表现出200MPa或更大的拉伸强度,并且强度降低大于基体相 在37℃,pH 7.3的水中。 基体相和分散相中各成分的重量比分别为50:50〜95:5,分散相为沿纤维方向拉伸取向的针状结构。 可以获得具有优异的机械强度和柔韧性,适度的水解性,高韧带稳定性并且适合作为手术可吸收缝合材料的可降解单丝。 还提供了一个准备过程。
    • 19. 发明授权
    • Breathable, hydrolyzable porous film
    • 透气,可水解多孔膜
    • US5340646A
    • 1994-08-23
    • US871651
    • 1992-04-21
    • Kenji MoritaKohichi UchikiHosei Shinoda
    • Kenji MoritaKohichi UchikiHosei Shinoda
    • C08J5/18B32B3/06C08G63/08
    • C08J5/18C08J2367/04Y10S428/91Y10T428/249956Y10T428/25Y10T428/258
    • A breathable, hydrolyzable, porous film which is obtained by the process comprising adding from 40 to 250 parts by weight of a finely-powdered filler having an average particle size of from 0.3 to 4 .mu.m to 100 parts by weight of a polylactic acid-based resin composition comprising from 80 to 100% by weight of polylactic acid or a lactic acid-hydroxycarboxylic acid copolymer and from 0 to 20% by weight of a plasticizer, melting and film-forming the resultant mixture, and successively stretching the thus-obtained film 1.1 times or more at least in the direction of the axis; and which is consequently useful as a material for leakproof films of sanitary materials such as a paper diaper and packaging materials, and does not accumulate as wastes because of hydrolyzability in the natural environment in the case of being abandoned after use.
    • 一种透气的,可水解的多孔膜,其通过该方法获得,包括将40至250重量份的平均粒度为0.3至4μm的细粉末填料加入到100重量份的聚乳酸 - 包含80-100重量%的聚乳酸或乳酸 - 羟基羧酸共聚物和0-20重量%的增塑剂,熔融和成膜所得混合物,并依次拉伸由此获得的 至少在轴的方向上为1.1倍以上的膜; 因此可用作纸尿布和包装材料等卫生材料的防漏膜的材料,并且由于在使用后放弃的情况下由于自然环境中的水解性而不会作为废物积聚。