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公开(公告)号：US4434252A
公开(公告)日：1984-02-28
申请号：US449647
申请日：1982-12-14
CPC分类号： C08J9/0061 , C08J9/147 , C08J2327/06 , C08J2433/00 , Y10S264/13
摘要： New rigid polyvinyl chloride foam having a density of less than 200 kg/m.sup.3 and having a uniform, fine-celled cell-structure consisting of a rigid vinyl chloride homopolymer containing per 100 parts by weight of polyvinyl chloride 0.1-15 parts by weight of a homo- or copolymer of an alkyl methacrylate having an alkylgroup of 1-10 carbon atoms having a viscosity of the solution .eta..sub.0.1 of between 1.times.10.sup.-6 and 4.times.10.sup.-6 m.sup.2 /s measured at 293 K in 1,2 dichloro ethylene and a method for the preparation of such a new rigid polyvinyl chloride foam.
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公开(公告)号：US4427795A
公开(公告)日：1984-01-24
申请号：US449648
申请日：1982-12-14
CPC分类号： C08J9/0061 , C08J9/147 , C08J2327/06 , C08J2433/00 , Y10S264/13
摘要： New rigid polyvinyl chloride foam having a density of between 10 and 50 kg/m.sup.3 and having a uniform, fine-celled cell-structure consisting of a rigid vinyl chloride homopolymer containing per 100 parts by weight of polyvinyl chloride 0.1-15 parts by weight of a homo- or copolymer of an alkyl methacrylate having an alkyl group of 1-10 carbon atoms and a method for the preparation of such a rigid polyvinyl chloride foam.
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3.发明授权Process for producing polyethylene articles having a high tensile strength and modulus 失效具有高拉伸强度和模量的聚乙烯制品的生产方法
公开(公告)号：US4888141A
公开(公告)日：1989-12-19
申请号：US106457
申请日：1987-10-09
IPC分类号： B29B9/16 , B29B13/08 , B29C35/08 , B29C55/00 , B29C55/06 , B29C67/24 , B29K23/00 , C08J3/28 , C08J5/18 , C08L23/06 , D01F6/04 , D01F6/46
CPC分类号： C08J3/28 , B29B13/08 , B29B9/16 , B29C55/005 , B29C55/065 , B29C67/24 , C08J5/18 , C08L23/06 , D01F6/04 , B29C2035/0877 , B29K2023/0683 , C08J2323/06
摘要： High strength and modulus articles, such as filaments, fibers, tapes, films, tubes, bars or profiles, are prepared by irradiating a solid, particular, lamellar, disentangled polyethylene with a Mw>4.times.10.sup.5, transforming this polyethylene above the melt temperature into an article, cooling said article to below the melting point and stretching it in several steps at rising temperature but below the melting point of the article.Advantages are i.a. the lower costs compared with the known processes, such as solid state extrusion or thermoreversible gelation.
摘要翻译： 通过照射具有Mw> 4×10 5的固体，特别是层状的解缠结的聚乙烯来制备高强度和模量的制品，例如长丝，纤维，带，膜，管，条或型材，将该聚乙烯转化成熔融温度以上 制品，将制品冷却到低于熔点，并在升高的温度但低于制品的熔点的几个步骤中拉伸。 优点是i.a 与已知方法相比较较低的成本，例如固态挤出或热可逆凝胶化。
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公开(公告)号：US5248461A
公开(公告)日：1993-09-28
申请号：US754158
申请日：1991-09-03
CPC分类号： C08J9/18 , B29C55/005 , C08J3/092 , C08J5/18 , C08J9/28 , B29K2023/0683 , B29K2105/04 , C08J2201/0502 , C08J2323/06
摘要： The invention relates to microporous films of ultrahigh molecular weight polyethylene and to a process for the preparation thereof by forming a solution of UHMWPE in an evaporable solvent into a film and evaporating the solvent from the film at a temperature below the dissolution temperature, the shrinking tendency occurring in the film being prevented in at least one direction in the plane of the film.
摘要翻译： 本发明涉及超高分子量聚乙烯微孔薄膜及其制备方法，通过将UHMWPE在蒸发溶剂中的溶液形成薄膜，并在低于溶解温度的温度下从薄膜中蒸发溶剂，其收缩趋势 在膜的平面中至少一个方向上防止了膜的发生。
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5.发明授权
公开(公告)号：US4948544A
公开(公告)日：1990-08-14
申请号：US223973
申请日：1988-07-25
CPC分类号： C08J5/18 , B29C55/005 , B29K2023/00 , B29K2023/083 , C08J2323/02
摘要： A process is disclosed for producting thin stretched films having a thickness between 0.1 and 20 .mu.m from polyolefins of ultrahigh molecular weight by dissolving the polyolefin in a solvent, shaping the solution at a temperature above the solution temperature of the polyolefin to a tape, cooling the tape to a temperature below the solution temperature to obtain gelation and stretching the gelled tape. In this process the gelled tape is initially subjected to a preliminary orientation in one direction, under solvent removal, and is then stretched in a direction essentially perpendicular to the direction of preliminary orientation, at elevated temperature, followed by final stretching to obtain the finished thin films. This process makes possible the production of films which are free from pores, that is to say transparent and which posses high Young's moduli, high tensile strengths and favorable values for elongation at break.
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