Process for production of polyurethane
AssigneeKuraray Co., Ltd.
InventorsMitsuo Matsumoto, Koji Hirai, Noriaki Yoshimura, Takayuki Okamura
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Abstract
A novel process for production of polyurethane having excellent hydrolysis resistance, heat resistance, low-temperature characteristics and no tendency of crystallization and capability of making high solid content solution, which is obtained from a polymerized polyol having two or more hydroxy groups in the molecule and a polyisocyanate, and optionally a chain extender, characterized in that the polymerized polyol component is a polymerized polyol having ##STR1## groups in the molecule.
Claims5
A process for production of polyurethane having excellent hydrolysis resistance which is obtained from a polymerized polyol having two or more hydroxyl groups in the molecule and a polyisocyanate, and optionally a chain extender, characterized in that the polymerized polyol component is a polymerized polyol having ##STR11## groups in the molecule, and the amount of the reactants is such that the ratio of the number of groups of NCO in the polyisocyanate to the number of active hydrogen atoms in the polymerized polyol and the chain extender ranges from 0.8/1 to 3.0/1.0.
Dependencies are inferred from the claim text.