Process for the production of oligoesters containing hydroxy groups and their use

US4757097A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Manfred Dietrich · Leverkusen, DE
• Manfred Kapps · Bensberg, DE
• Klaus Konig · Leverkusen, DE
• Roland Nast

Key dates

• Filing date: Jun 23, 1987
• Grant date: Jul 12, 1988
• Expiry date: Jun 23, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C69/657
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Oligoesters having hydroxyl groups and an OH number of from 200 to 600 mg KOH/g are made by reacting a cyclic dicarboxylic acid anhydride in which no halogen is present with a polyfunctional alcohol or dialkanolamine in a molar ratio of from 1:0.5 to 1:1.5 at a temperature of from 50.degree. to 150.degree. C. to form the corresponding dicarboxylic acid semiester and/or semiamide. This semiester and/or semiamide is then alkoxylated with ethylene oxide and/or propylene oxide in the presence of a catalyst at 80.degree. to 150.degree. C. The equivalent ratio of acid groups to alkylene oxide groups is from 1:0.8 to 1:1.7. The catalysts are reaction products of alkoxides with at least 3 C-atoms with ammonia, piperidine, piperazine and/or C.sub.2 -C.sub.6 aliphatic, polyamines, preferably diamines in which all of the NH-functional groups have been alkoxylated. The resultant oligoester may then be reacted with a polyisocyanate optionally in the presence of known additives, such as blowing agents and catalysts.