Process for the production and purification of SH-terminated prepolymers and use thereof

US4861863A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Rene-Andres A. Gonzalez · Goldkronach, DE
• Winfried Emmerling · Neuss, DE
• Werner Krause · Plantsville, US
• Tore Podola · Monheim, DE
• Klaus Neitzer · Goldkronach, DE

Key dates

• Filing date: Oct 30, 1987
• Grant date: Aug 29, 1989
• Expiry date: Oct 30, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/30
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Process for the production and purification of SH-terminated prepolymers by reaction of polyhydroxy compounds with thioalkane carboxylic acids, wherein one or more adducts of ethylene oxide and/or propylene oxide with triols or tetraols corresponding to the following general formula ##STR1## in which m=1, 2 or 3, PA1 n=0, 1 or 2 and PA1 p=0 or 1, and having a molecular weight of from 400 to 10,000 are reacted with one or more thioalkane carboxylic acids corresponding to the following general formula EQU HS--R--COOH (II) in which R is a straight-chain or branched C.sub.1 -C.sub.8 alkylene radical, in such a molar ratio that, for every mole of thioalkane carboxylic acid (II), there is an equivalent of the OH groups in compound (I), a neutralizing agent is added to the reaction mixture in a quantity sufficient to neutralize the unreacted quantity of thioalkane carboxylic acid (II), one or more compounds which bind the water of neutralization and a precipitant in excess are added at the same time as or immediately after the neutralizing agent, the reaction mixture is freed in known manner from the precipitated solids and, if desired, the prepolymer is isolated.