PRODUCTION OF URETHANE FOAM HAVING DIFFERENT HARDNESS

PRODUCTION OF URETHANE FOAM HAVING DIFFERENT HARDNESS

PURPOSE:To obtain an urethane foam, having different hardnesses and suitable as cushioning materials, by impregnating part of a flexible urethane foam with a specific impregnant consisting of an organic polyisocyanate, etc., and curing the above-mentioned part. CONSTITUTION:Part of an open-cell flex...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: YOSHIDA HIROYUKI, SENKE HIDEO, OGAWA YOSHIHIKO
Format: Patent
Sprache:eng
Schlagworte:
AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G
CHEMISTRY
COMPOSITIONS BASED THEREON
GENERAL PROCESSES OF COMPOUNDING
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
WORKING-UP
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Beschreibung
Zusammenfassung:PURPOSE:To obtain an urethane foam, having different hardnesses and suitable as cushioning materials, by impregnating part of a flexible urethane foam with a specific impregnant consisting of an organic polyisocyanate, etc., and curing the above-mentioned part. CONSTITUTION:Part of an open-cell flexible urethane foam is impregnated with an impregnant obtained by blending an organic polyisocyanate, e.g. methylene diisocyanate, etc., and/or terminal isocyanate prepolymer consisting of an organic polyisocyanate and polyhydroxyl compound with 2-pyrrolidone and, as necessary, an organic solvent, e.g. methylene chloride, etc., and the impregnated part is then brought into contact with water or steam and cured.