Polyurethane elastomers based on heterocyclic polyester diols

A polyurethane elastomer comprising the reaction product of (a) a polyester diol having a molecular weight of 3000 to 30,000 of the formula:

• ##STR5## wherein A is D, --(CH.sub.2).sub.m O--.sub.n or ##STR6## B is --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.7 --, --(CH.sub.2).sub.8 --, --CH.dbd.CH--, o-phenylene, m-phenylene or p-phenylene;
• D is a bivalent radical formed by removing the hydroxyl group from one of the following heterocyclic diols:
• Bis-[5,5-dimethyl-3-(2-hydroxyethyl)-hydantoinyl]-methane,
• 1. 3-di-(2-hydroxyethyl)-5,5-dimethyl hydantoin,
• 1,3-di-(2-hydroxyethyl)-benzimidazolone,
• 1. 3-di-(2-hydroxyethyl)-4,5,6,7-tetrabromo benzimidazolone,
• 1,3-di-(2-hydroxyethyl)-4,5,6,7-tetrahydro benzimidazolone,
• Bis-[5,5-dimethyl-3-(2-hydroxypropyl)-hydantoinyl]-methane,
• 1,3-di-(2-hydroxypropyl)-5,5-dimethyl hydantoin, or
• 1,3-di-(2-hydroxypropyl)-benzimidazolone;
• and
• e,m and n are whole numbers;
• and
• wherein the polyester diol is the reaction product of a dicarboxylic acid selected from the group consisting of adipic acid, azelaic acid, sebacic acid, maleic acid, phthalic acid, isophthalic acid, and terephthalic acid;
• and aliphatic diol selected from the group consisting of ethylene glycol, 1,4-butanediol, and 1,2-propanediol and the heterocyclic diol wherein the molar ratio of the dicarboxylic acid, the aliphatic diol and the heterocyclic diol is respectively about 2.8 to 2 to 1;
• and
• (b) maximally up to 20% by weight of a diisocyanate.