REACTION INJECTION MOLDING

PURPOSE:To improve the heat resistance of a polyurethane elastomer without detriment to its elongation properties by using a high-MW polyoxyalkylene polyol having a low degree of unsaturation and a specified hydroxyl value and a chain extender which comprises a polyamine whose amino groups are direc...

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Bibliographic Details
Main Authors SAITO JOICHI, WADA HIROSHI, SHIMADA TADASHI, TANABE KIYOSHI
Format Patent
LanguageEnglish
Published 07.12.1990
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:PURPOSE:To improve the heat resistance of a polyurethane elastomer without detriment to its elongation properties by using a high-MW polyoxyalkylene polyol having a low degree of unsaturation and a specified hydroxyl value and a chain extender which comprises a polyamine whose amino groups are directly bonded to an aromatic ring. CONSTITUTION:A polyurethane elastomer molding is obtained by the reaction injection molding of a starting component essentially consisting of a polyoxyalkylenediol of a degree of unsaturation <=0.05meq/g, most desirably >=0.025meq/g, a hydroxyl value of 5-60, most desirably <10 (MW/OH >=2900), the number of hydroxyls per molecule of 2-8, desirably 2-6 and a chain extender comprising a polyamine whose primary and/or secondary aminos are directly bonded to an aromatic ring (e.g. diethyltoluenediamine) with a starting component essentially consisting of a polyisocyanate compound.
Bibliography:Application Number: JP19890117514