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    • 7. 发明授权
    • High glass transition temperature copolycarbonates, methods of manufacture, and uses thereof
    • 高玻璃化转变温度共聚碳酸酯,其制造方法及其应用
    • US07358321B2
    • 2008-04-15
    • US11289063
    • 2005-11-29
    • James A. MahoodEmine Elif Gurel
    • James A. MahoodEmine Elif Gurel
    • C08G64/00
    • C08G64/12C08J5/18C08J2369/00
    • A copolycarbonate is discloses, comprising units of the formula (1) wherein 70 to 99.5 mole percent of the total number of R1 groups are derived from a dihydroxy compound of formula (2) wherein R2 and R3 are each independently a halogen or a C1-6 alkyl group, R4 is a methyl or a phenyl group, and c is independently 0 to 4; and 0.5 to 30 mole percent of the total number of R1 groups are derived from a dihydroxy compound of formula (3) HO—R5—OH  (3) wherein at least 60% of the R5 groups are aromatic, and the dihydroxy compound of formula (3) is not the same as the dihydroxy compound of formula (2), and wherein the copolycarbonate has a glass transition temperature of 250° C. or higher.
    • 公开了一种共聚碳酸酯,其包含式(1)的单元,其中R 1〜12的总数的70-99.5摩尔%衍生自式(2)的二羟基化合物,其中R 1, 2和R 3各自独立地为卤素或C 1-6烷基,R 4为甲基或 苯基,c独立地为0〜4; 并且R 1〜12个基团的总数的0.5〜30摩尔%来源于式(3)的二羟基化合物<?in-line-formula description =“In-line Formulas”end =“ 铅“→HO-R 5 -OH(3)<?in-line-formula description =”In-line Formulas“end =”tail“?>其中至少60%的R 式(3)的二羟基化合物与式(2)的二羟基化合物不同,其中共聚碳酸酯的玻璃化转变温度为250℃,或 更高。
    • 10. 发明授权
    • Branched polycarbonates and processes for producing the same
    • 支链聚碳酸酯及其制备方法
    • US07696297B2
    • 2010-04-13
    • US12164922
    • 2008-06-30
    • Laura G. SchultzJames A. MahoodBrian D. Mullen
    • Laura G. SchultzJames A. MahoodBrian D. Mullen
    • C08G64/00
    • C08G64/24C08G64/14
    • Methods for making a branched polycarbonate are disclosed. An interfacial mixture comprising water, a substantially water-immiscible organic solvent, a dihydroxy compound, a polyhydric branching agent, an endcapping agent, a catalyst, and a base is formed. The base and the branching agent are dissolved in the mixture before the dihydroxy compound is added, and the interfacial mixture has a basic pH. The mixture is reacted by adding a carbonate precursor to the mixture while maintaining the pH between about 8 and about 10 to form the branched polycarbonate. The resulting branched polycarbonates may contain more than 1.5 mole % of the THPE; have residual chloride content of 20 ppm or less; and a weight average molecular weight of about 55,000 or less. They may also be highly transparent.
    • 公开了制造支化聚碳酸酯的方法。 形成包含水,基本上与水不混溶的有机溶剂,二羟基化合物,多元支化剂,封端剂,催化剂和碱的界面混合物。 在加入二羟基化合物之前,将碱和支化剂溶解在混合物中,并且界面混合物具有碱性pH。 通过向混合物中加入碳酸酯前体,同时保持pH在约8至约10之间,使混合物反应以形成支化聚碳酸酯。 得到的支化聚碳酸酯可含有大于1.5摩尔%的THPE; 残留氯含量为20ppm以下; 重均分子量约为55,000以下。 他们也可能是高度透明的。