Pure, in particular catalyst-free polyurethanes
    2.
    发明授权
    Pure, in particular catalyst-free polyurethanes 失效
    纯的,特别是无催化剂的聚氨酯

    公开(公告)号:US5374704A

    公开(公告)日:1994-12-20

    申请号:US166760

    申请日:1993-12-14

    摘要: The present invention is directed to pure polyurethanes which are biocompatible. These pure polyurethanes comprise the reaction product of:a) a pre-adduct containing NCO groups and comprising the reaction product ofi) a diisocyanate selected from the group consisting of aliphatic diisocyanates, cycloaliphatic diisocyanates, and mixtures thereof, withii) a macrodiol having a molecular weight of from 500 to 10,000 wherein said components i) and ii) reacted at temperatures of from 90.degree.-150.degree. C.; withb) a chain extender having a molecular weight of from 62 to 400 and being selected from the group consisting of aliphatic diols, cycloaliphatic diols, and mixtures thereof, and optionally,c) additional diisocyanate selected from the group consisting of aliphatic diisocyanates, cycloaliphatic diisocyanates, and mixtures thereof,wherein said component c), when added, is added either simultaneously with component b) or separately from component b), the quantities of components a)i), a)ii), and c) being such that the molar ratio of diisocyanate to macrodiol is from 1.5:1 to 22:1, and the reaction of components a) and b) and optionally component c) is conducted at temperatures of from 90.degree. to 230.degree. C., with the proviso that the reaction conditions are maintained until said polyurethane has a melt viscosity of at least 2500 mPa.s at 120.degree. C.

    摘要翻译: 本发明涉及生物相容的纯聚氨酯。 这些纯聚氨酯包括以下物质的反应产物:a)含有NCO基团的预加合物,其包含i)选自脂族二异氰酸酯,脂环族二异氰酸酯及其混合物的二异氰酸酯的反应产物,ii)具有 分子量为500至10,000,其中所述组分i)和ii)在90-150℃的温度下反应; 其中b)分子量为62至400的扩链剂,并且选自脂族二醇,脂环族二醇及其混合物,以及任选地,c)另外的二异氰酸酯,其选自脂族二异氰酸酯,脂环族脂族 二异氰酸酯及其混合物,其中所述组分c)在加入时与组分b)同时加入或与组分b)分开加入,组分a)i),a)ii)和c)的数量使得 二异氰酸酯与大分子二醇的摩尔比为1.5:1至22:1,组分a)和b)和任选组分c)的反应在90℃至230℃的温度下进行,条件是 维持反应条件,直到所述聚氨酯在120℃下的熔体粘度为至少2500mPa.s。

    Cycloaliphatic thermoplastic polyurethane elastomers
    7.
    发明授权
    Cycloaliphatic thermoplastic polyurethane elastomers 失效
    环脂族热塑性聚氨酯弹性体

    公开(公告)号:US5942593A

    公开(公告)日:1999-08-24

    申请号:US805840

    申请日:1997-03-03

    摘要: A process for the preparation of a polyurethane-urea elastomer having a mole ratio of NCO groups to all active hydrogen atoms in the range of 0.9 to 1.2 is disclosed. The process comprise reacting (A), (B) and (C.2) for form an NCO-containing prepolymer and then reacting said prepolymer with (C.1) and (D). Accordingly (A) is 5-isocyanato-1-(isocyanatomethyl)-1,1,3-trimethylcyclohexane or bis-(4-isocyanatocyclohexyl)-methane,(B) is polytetrahydrofuran or hexanediol polycarbonate and (C.2) is a chain extender. (C.1) is 5-amino-3-amino-methyl-1,3,3-trimethylcyclohexane or bis-(4-aminocyclohexyl)-methane and (D) is a molecular weight regulator. The elastomer thus produced is particularly suitable for the preparation of moldings, films, flexible tubing (for medical purposes) and catheters.

    摘要翻译: 公开了一种制备具有NCO基摩尔数与所有活性氢原子在0.9至1.2范围内的聚氨酯 - 脲弹性体的方法。 该方法包括使(A),(B)和(C.2)反应形成含NCO的预聚物,然后使所述预聚物与(C.1)和(D)反应。 因此(A)是5-异氰酸基-1-(异氰酸根合甲基)-1,1,3-三甲基环己烷或双 - (4-异氰酸根合环己基) - 甲烷,(B)是聚四氢呋喃或己二醇聚碳酸酯,(C.2) 延长剂 (C.1)是5-氨基-3-氨基 - 甲基-1,3,3-三甲基环己烷或双 - (4-氨基环己基) - 甲烷,(D)是分子量调节剂。 如此制备的弹性体特别适用于制备模制品,薄膜,柔性管(用于医疗用途)和导管。