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    • 3. 发明授权
    • Copolymers of tyrosine-based polycarbonate and poly(alkylene oxide)
    • 酪氨酸基聚碳酸酯和聚(环氧烷)的共聚物
    • US5658995A
    • 1997-08-19
    • US562842
    • 1995-11-27
    • Joachim B. KohnChun Yu
    • Joachim B. KohnChun Yu
    • A61K47/34A61K47/48A61L27/00C08G63/672C08G63/685C08G64/16C08G64/18C08G69/40C08L69/00C08L77/00
    • A61K47/48215A61K47/48192A61K47/48246C08G63/6856C08G64/1641C08G64/183
    • Random block copolymers having the formula: ##STR1## wherein R.sub.1 is --CH.dbd.CH-- or (--CH.sub.2 --).sub.j, in which j is zero or an integer from one to eight; R.sub.2 is selected from hydrogen, straight and branched alkyl and alkylaryl groups containing up to 18 carbon atoms and derivatives or biologically and pharmaceutically active compounds covalently bonded to said copolymer; each R.sub.3 is independently an alkylene group containing up to 4 carbon atoms; y is an integer between about 5 and about 3000; and f is the percent molar fraction of alkylene oxide in the copolymer and ranges between about 1 and about 99 mole percent. Implantable medical devices and drug delivery implants containing the random block copolymers are also disclosed, along with methods for drug delivery and for preventing the formation of adhesions between injured tissues employing the random block copolymers. Polyarylate random block copolymers are also described.
    • 其中R 1为-CH = CH-或(-CH 2 - )j,其中j为0或1至8的整数; R2选自含有至多18个碳原子的氢,直链和支链烷基和烷基芳基以及与所述共聚物共价结合的衍生物或生物和药学活性化合物; 每个R 3独立地是含有至多4个碳原子的亚烷基; y为约5至约3000之间的整数; f是共聚物中环氧烷的摩尔百分比,在约1至约99摩尔%之间。 还公开了含有无规嵌段共聚物的植入式医疗装置和药物递送植入物,以及用于药物递送和用于使用无规嵌段共聚物的损伤组织之间形成粘连的方法。 还描述了聚芳酯无规嵌段共聚物。
    • 10. 发明授权
    • Biphasic polymerization process
    • 双相聚合工艺
    • US06359102B1
    • 2002-03-19
    • US09107753
    • 1998-06-29
    • John E. KemnitzerGeorge L. BrodeJoachim B. Kohn
    • John E. KemnitzerGeorge L. BrodeJoachim B. Kohn
    • C08G6424
    • C08G64/24C08G63/6856C08G63/79C08G63/87C08G64/12
    • Improvements are disclosed for biphasic polymerization processes in which an aqueous solution of a first monomer that is hydrolytically unstable below a pH of about six or above a pH of about eight is admixed with a water-immiscible organic solvent and there is added to the admixture a catalyst selected from tertiary amine, quaternary amine and phosphonium catalysts, an acid-forming co-monomer for the first monomer, an acid scavenger, after which the resulting polymer is recovered, wherein the improvement includes providing the aqueous solution at a pH between about si and about eight, and adding to the admixture the acid-forming co-monomer and the acid scavenger at relative rates effective to maintain the pH of the admixture between about six and about eight. The catalyst may be added in a molar ratio to the first monomer effective to provide a predetermined weight-average or number-average molecular weight for the resulting polymer. Biphasic polymerization processes for monomers that are not pH sensitive are also disclosed.
    • 对于双相聚合方法公开了改进,其中将水解稳定性低于约6或大于约pH 8的水解不稳定的第一单体的水溶液与水不混溶的有机溶剂混合并加入到混合物a 选自叔胺,季胺和鏻催化剂的催化剂,用于第一单体的酸形成共聚单体,酸清除剂,之后回收所得聚合物,其中改进包括将水溶液提供在约si 和约8,并且以相对速率加入酸形成共聚单体和酸清除剂,以有效地将混合物的pH保持在约6至约8之间。 催化剂可以与第一单体的摩尔比加入,有效地为所得聚合物提供预定的重均分子量或数均分子量。 还公开了对不敏感的单体的双相聚合方法。