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    • 3. 发明授权
    • Pure, in particular catalyst-free polyurethanes
    • 纯的,特别是无催化剂的聚氨酯
    • US5374704A
    • 1994-12-20
    • US166760
    • 1993-12-14
    • Hanns-Peter MullerRolf DheinHerbert HuglHeinz Pudleiner
    • Hanns-Peter MullerRolf DheinHerbert HuglHeinz Pudleiner
    • A61L24/00A61L27/00A61L27/18A61L29/00A61L29/06A61L31/06B65D65/38C08G18/08C08G18/10C08G18/44C08G18/73C08G18/75C08G18/77C08J5/18
    • C08G18/773A61L27/18A61L29/06A61L31/06C08G18/10C08G18/44C08G18/75
    • 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.
    • 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。
    • 8. 发明授权
    • Stabilization of highly heat distortion resistant polycarbonates
    • 高耐热变形聚碳酸酯的稳定化
    • US5194467A
    • 1993-03-16
    • US816918
    • 1992-01-03
    • Helmut-Martin MeierUwe WesteppeRolf DheinDieter FreitagMartin WandelAxel Sandquist
    • Helmut-Martin MeierUwe WesteppeRolf DheinDieter FreitagMartin WandelAxel Sandquist
    • C08K5/5435
    • C08K5/5435
    • Highly heat distortion resistant moulding compositions are disclosed comprising an aromatic polycarbonate having molecular weights Mw (weight average) of a least 10,000, containing bifunctional carbonate structural units corresponding to formula (Ia) ##STR1## wherein R.sup.1 and R.sup.2 denote, independently of one another, hydrogen, halogen, C.sub.1 -C.sub.8 -alkyl, C.sub.5 -C.sub.6 -cycloalkyl, C.sub.6 -C.sub.10 -aryl or C.sub.7 -C.sub.12 -aralkyl,m stands for an integer from 4 to 7,R.sup.3 and R.sup.4, which are selected individually for each X, denote, independently of one another, hydrogen or C.sub.1 -C.sub.6 -alkyl, andX denotes carbonunder the condition that R.sup.3 and R.sup.4 are both alkyl on at least one X atom andas the only thermo stabilizer, from 0.001 to 1% by weight of a siloxane corresponding to formula (II) ##STR2## wherein R and R' denote, independently of one another, C.sub.1 -C.sub.4 -alkyl or -aryl andx and y stand for the numbers 1,2 or 3 and x+y always add up to 4.
    • 公开了耐热变形性模塑组合物,其包含具有至少10,000的分子量Mw(重均分子)的芳族聚碳酸酯,其含有对应于式(Ia)的双官能碳酸酯结构单元,其中R1和R2独立地表示 另一个是氢,卤素,C 1 -C 8 - 烷基,C 5 -C 6 - 环烷基,C 6 -C 10 - 芳基或C 7 -C 12 - 芳烷基,m代表4-7的整数,R3和R4分别为 每个X彼此独立地表示氢或C 1 -C 6 - 烷基,X表示碳,在R 3和R 4均为至少一个X原子上为烷基且仅为热稳定剂的情况下,为0.001至1% 重量的对应于式(II)的硅氧烷(II)其中R和R'彼此独立地表示C 1 -C 4 - 烷基或 - 芳基,x和y表示数字1,2或3 并且x + y总是最多为4。