Process for the preparation of 4-hydroxyphenyl 4-hydroxybenzoate and the
use thereof
    4.
    发明授权
    Process for the preparation of 4-hydroxyphenyl 4-hydroxybenzoate and the use thereof 失效
    4-羟基苯甲酸4-羟基苯酯的制备方法及其用途

    公开(公告)号:US4855484A

    公开(公告)日:1989-08-08

    申请号:US64679

    申请日:1987-06-22

    CPC分类号: C07C67/08 C07C69/88

    摘要: A process for the preparation of 4-hydroxyphenyl 4-hydroxy-benzoate by esterification of hydroquinone and p-hydroxybenzoic acid is described, wherein an esterification catalyst is used and wherein the reaction is carried out in a reaction medium in which the reactants are substantially dispersed. The use of the compound, accessible by the above process in high yield and good industrial purity, for the preparation of linear polycarbonates or copolycarbonates is furthermore claimed.

    摘要翻译: 描述了通过对苯二酚和对羟基苯甲酸的酯化制备4-羟基苯甲酸4-羟基苯酯的方法,其中使用酯化催化剂,其中反应在其中反应物基本上分散的反应介质中进行 。 还要求使用通过上述方法可获得的高产率和良好工业纯度的化合物用于线性聚碳酸酯或共聚碳酸酯的制备。

    Process for preparing polyurethanes from an organic diisocyanate ester
    8.
    发明授权
    Process for preparing polyurethanes from an organic diisocyanate ester 失效
    从有机二异氰酸酯制备聚氨酯的方法

    公开(公告)号:US4868268A

    公开(公告)日:1989-09-19

    申请号:US266557

    申请日:1988-11-03

    摘要: Novel polyurethanes are prepared by reacting(a) an organic diisocyanate of formula ##STR1## wherein M represents --CH.dbd.CH--; --N.dbd.N--; --CH.dbd.N--; ##STR2## or and where R.sub.1 through R.sub.4 may be the same or different and represent hydrogen, halogen, CN, CF.sub.3 or saturated aliphatic C.sub.1 -C.sub.12 alkyl residues which may be interrupted by ether hydrogen atoms with(b) compounds of molecular weights of from between 400 and 10,000 and which contain at least two active hydrogen atoms reactive toward isocyanate groups.

    摘要翻译: 通过使(a)式(IMAGE)的有机二异氰酸酯(其中M表示-CH = CH-)反应制备新的聚氨酯; -N = N- -CH = N- 或者其中R 1至R 4可以相同或不同,并且表示氢,卤素,CN,CF 3或可被醚氢原子间隔的饱和脂族C 1 -C 12烷基残基,(b)分子量为 在400和10,000之间,并且其含有至少两个对异氰酸酯基团反应的活性氢原子。