Process for the preparation of a polyurethane polymer with secondary hydroxyl end groups comprising polyester polyols

US9139685B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Hartmut Nefzger · Pulheim, DE
• Jörg Hofmann · Krefeld, DE
• Bert Klesczewski · Neunburg vorm Wald, DE
• Erika Bauer · Höchst im Odenwald, DE
• Klaus Lorenz · Worms, DE

Key dates

• Filing date: Jun 29, 2010
• Grant date: Sep 22, 2015
• Expiry date: Sep 1, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2110/0083
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the preparation of a polyurethane polymer, comprising the step of reaction ofA) polyester polyols with secondary hydroxyl end groups, which are obtainable from the reaction of a polyester comprising carboxyl end groups with an epoxide of the general formula (1):wherein R1 represents an alkyl radical or an aryl radical and wherein the polyester comprising carboxyl end groups has an acid number of from ≧25 mg of KOH/g to ≦400 mg of KOH/g and a hydroxyl number of ≦5 mg of KOH/g, withB) polyisocyanates which are chosen from the group comprising toluoylene-diisocyanate, diphenylmethane-diisocyanate, polymeric diphenylmethane-diisocyanate, xylylene-diisocyanate, naphthylene-diisocyanate, hexamethylene-diisocyanate, diisocyanatodicyclohexylmethane and/or isophorone-diisocyanate. The invention furthermore relates to polyurethane polymers prepared by such a process.