摘要:
The invention relates to a process for the purification of p,p-bisphenolate solutions such as are obtained in the production of bisphenolates from soda lye and bisphenols by extraction.
摘要:
A process for preparing bisphenol A which has a purity of at least 99.95 wt. % of p,p-bisphenol A (BPA). Thermally stable and colour-stable BPA purified in accordance with the invention produces improved thermal and colour stability and improved optical transparency in polymers such as e.g. polycarbonates prepared therefrom.
摘要:
The invention relates to the preparation of a transparent crystalline adduct consisting of bisphenol A (75 parts) and bisphenol TMC (25 parts), which has a melting point of 144.degree. C. which is below the melting points of the pure starting compounds bisphenol A (157.degree. C.) and bisphenol TMC (208.degree. C.).
摘要:
The invention relates to a method for the purification by distillation of p,p-bisphenol A from the melt. The p,p-bisphenol A melt thus obtained is highly heat-stable, stable in storage and colour-stable, is free from high-boiling components and no longer contains any surface-active or non-distillable metal, salt, acid or polymer components and no sulphur-containing components; o,p-BPA and phenol are removed and the low-boiling components are scarcely detectable.
摘要:
This invention relates to an ionic exchanger modified with thiazolines, to its preparation and to its use for the preparation of condensation products, particularly bisphenols.
摘要:
The invention relates to a process for the recovery of thermoplastic polymers from aqueous dispersions by spray-drying after treatment with carboxylic acid of formula I ##STR1## wherein X is a single bond, --CH.sub.2 -- or --C.sub.2 H.sub.4 --, andR is --H, --OH or ##STR2##
摘要翻译:本发明涉及一种通过喷雾干燥从水分散体中回收热塑性聚合物的方法,该方法是用式I的羧酸(I)(其中X是单键,-CH 2 - 或-C 2 H 4 - )和R 是-H,-OH或
摘要:
Semipermeable membranes of sulphonated polybenz-1,3-oxazin-2,4-diones for separating or enriching organic sulphonates by the method of inverse osmosis or ultrafiltration.
摘要:
Novel, sulphonated polybenz-1,3-oxazin-2,4-diones are produced by reacting polybenzoxazin diones with chlorosulphonic acid in a molar ratio of from 1:1 to 1:10.
摘要:
The invention relates to an improved process for the production of polymer powders based on graft polymers and optionally rubber-elastic polymers and vinyl monomer polymers.
摘要:
Alkyl sulphonic acid phenyl esters which are substituted by carboxylic acid esters can be obtained by reacting sulphochlorinated paraffins with hydroxy benzoic acid esters. Said compounds can be used as plasticizers for polymers.