Method of preparing chloroformate compounds
    1.
    发明授权
    Method of preparing chloroformate compounds 失效
    氯甲酸酯化合物的制备方法

    公开(公告)号:US5399657A

    公开(公告)日:1995-03-21

    申请号:US142737

    申请日:1993-10-26

    CPC分类号: C08G64/14 C07C68/02

    摘要: The invention relates to a method of preparing a compound of formula 1 ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 correspond to H, a branched or non-branched, optionally substituted alkyl group, or an optionally substituted aryl group, suitable as a chain stopper in the preparation of an aromatic polycarbonate, by reaction of a compound of formula 2 ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 have the meanings described hereinbefore, with phosgene, comprising the continuous supply of the compound of formula 2 and phosgene to a solution of phosgene in a solvent, the temperature being kept at a value between 0.degree. and 15.degree. C. and the pH being kept at a value between 1 and 6.

    摘要翻译: 本发明涉及制备式1化合物的方法(1)其中R 1,R 2和R 3对应于H,支链或非支链的任选取代的烷基或任选取代的芳基,其适于 通过将上述式2的化合物与光气反应制备芳族聚碳酸酯的链终止剂,包括连续供给式2化合物和光气至光气在溶剂中的溶液,温度为 保持在0℃和15℃之间的值,并且pH保持在1和6之间的值。

    Benzoxazolyl optical brightners in and for thermoplastic compositions
    7.
    发明授权
    Benzoxazolyl optical brightners in and for thermoplastic compositions 失效
    用于热塑性组合物的苯并恶唑光学增亮剂

    公开(公告)号:US5512620A

    公开(公告)日:1996-04-30

    申请号:US238288

    申请日:1994-05-05

    CPC分类号: C08K5/45 Y10S430/134

    摘要: Benzoxazolyl brightner compounds and thermoplastic combinations containing such are provided herein. The thermoplastic compositions comprise a thermoplastic resin, a phosphite heat stabilizer present in reduced levels, a brightner present in reduced levels and a pigment. Preferably the thermoplastic resin composition is transparent in nature. The compositions are useful for making molded and blow molded articles which require high levels of transparency, for example, glazing materials such thermoplastic windows. The composition exhibits enhanced appearance, namely a bright natural color in combination with low levels of yellowness by utilizing in combination reduced levels of phosphite and reduced levels of brightner, with moderate levels of pigment.

    摘要翻译: 本文提供了苯并恶唑基光亮剂化合物和含有这些化合物的热塑性组合物。 热塑性组合物包括热塑性树脂,以降低的水平存在的亚磷酸酯热稳定剂,以降低的水平存在的增白剂和颜料。 优选地,热塑性树脂组合物在本质上是透明的。 该组合物可用于制造需要高水平透明度的模制和吹塑制品,例如玻璃材料如热塑性窗。 组合物表现出增强的外观,即通过以中等水平的颜料组合降低亚磷酸盐水平和降低水平的光亮剂,结合低水平黄色而具有明亮的天然色彩。

    Catalytic, interfacial preparation of aromatic polycarbonates with
continuous dosing of carbonate precursor
    8.
    发明授权
    Catalytic, interfacial preparation of aromatic polycarbonates with continuous dosing of carbonate precursor 失效
    碳酸酯前驱体连续处理的芳族聚碳酸酯的催化,界面制备

    公开(公告)号:US5210173A

    公开(公告)日:1993-05-11

    申请号:US878788

    申请日:1992-05-05

    IPC分类号: C08G64/22 C08G64/24

    CPC分类号: C08G64/24

    摘要: The invention relates to a method of preparing aromatic polycarbonates by catalytic interface polymerization of at least one bivalent phenol and a carbonyl halide in the presence of a polycondensation catalyst, which method is characterized in that the conversion is carried out in a two-phase system with continuous dosing of the carbonyl halide, which two-phase system is based on water and an organic solvent, in which the quantity of organic solvent at the beginning of the polycondensation lies between 10% and 75% of the quantity of organic solvent which is required at the polymerization temperature for dissolving the quantity of polycarbonate which may be formed from the quantity of bivalent phenol which is present at the beginning of the polycondensation, in that after dosing at least 20% of the carbonyl halide a remaining quantity of organic solvent is added which is at least sufficient to keep the formed polycarbonate in solution.