Polyphenylene ether blends and a process for the preparation thereof
    1.
    发明授权
    Polyphenylene ether blends and a process for the preparation thereof 失效
    聚苯醚共混物及其制备方法

    公开(公告)号:US5929168A

    公开(公告)日:1999-07-27

    申请号:US737497

    申请日:1996-11-19

    摘要: The present invention concerns polymer blends and processes for the preparation thereof. The present blends contain a) 5 to 95 parts by weight of poly(2,6-dimethyl-1,4-phenylene)ether, b) 95 to 5 parts by weight of a second polymer which is immiscible therewith, and c) a component (a compatibilizer) which enhances the compatibility of the polymers. According to the invention the component enhancing the compatibility of the polymers comprises 0.1 to 10%, preferably about 1.5 to 10%, calculated on basis of the total weight of components a and b, of at least one compound C, which has the formulaA.sub.i --B.sub.j IwhereinA stands for a group which contains at least one ring with 3 to 7 members, capable of forming ring-to-ring interactions with the phenyl rings of poly(2,6-dimethyl-1,4-phenylene)ether,B is a polar group,i is an integer 1 to 20, andj is an integer 0 to 20,whereati+j is greater than or equal to 2,the melting point of compound C is above 50.degree. C. and the boiling point thereof above 200.degree. C. (at 760 mmHg) and ccompound C is capable of at least partially dissolving poly(2,6-dimethyl-1,4-phenylene)ether and is preferably a hydroquinone derivative.

    摘要翻译: PCT No.PCT / FI95 / 00275 Sec。 371日期1996年11月19日 102(e)1996年11月19日PCT PCT 1995年5月19日PCT公布。 公开号WO95 / 32243 日期:1995年11月30日本发明涉及聚合物共混物及其制备方法。 本发明共混物包含a)5-95重量份的聚(2,6-二甲基-1,4-亚苯基)醚,b)95-5重量份与其不混溶的第二聚合物,和c)a 组分(增容剂),其增强聚合物的相容性。 根据本发明,提高聚合物相容性的组分包含0.1至10%,优选约1.5至10%,基于组分a和b的总重量计算,至少一种化合物C具有式A1- 其中A代表含有至少一个具有3至7个成员的环的基团,其能够与聚(2,6-二甲基-1,4-亚苯基)醚的苯环形成环 - 环相互作用,B是 极性基,i为1〜20的整数,j为0〜20的整数,i + j大于或等于2,化合物C的熔点在50℃以上,沸点 高于200℃(760mmHg),c化合物C能够至少部分溶解聚(2,6-二甲基-1,4-亚苯基)醚,优选氢醌衍生物。

    Method for the removal and recovery of lactide from polylactide
    2.
    发明授权
    Method for the removal and recovery of lactide from polylactide 失效
    从聚丙交酯去除和回收丙交酯的方法

    公开(公告)号:US06187901B1

    公开(公告)日:2001-02-13

    申请号:US09367381

    申请日:1999-08-13

    IPC分类号: C08G6308

    CPC分类号: C08G63/08 C08G63/90

    摘要: The invention relates to a method for the removal of lactide from polylactide and recovery of lactide from a lactide-containing gas by cooling the hot lactide-containing gas, wherein a polymer melt traveling through a nozzle forms thin threads the surface area of which is so large that in a normal-pressure or vacuum evaporator the lactide evaporates from the polymer rapidly into a hot carrier-gas flow and the polymer settles under gravity onto a collecting device. A hot lactide-containing gas is cooled rapidly to a temperature below 100° C., whereupon the lactide crystallizes from gas, forming lactide crystals, which are separated from the gas.

    摘要翻译: 本发明涉及从聚丙交酯中除去丙交酯并从含丙交酯的气体中回收丙交酯的方法,其中,通过冷却含丙交酯的气体,其中通过喷嘴流动的聚合物熔体形成薄的螺纹,其表面积如此 大的是,在常压或真空蒸发器中,丙交酯从聚合物快速蒸发成热载气流,聚合物在重力作用下沉降到收集装置上。 将含热丙交酯的气体快速冷却至低于100℃的温度,随后丙交酯从气体中结晶,形成与气体分离的丙交酯晶体。