Polyurethane based on epoxy-containing polymer polyol and process for making the same
AssigneeSanyo Chemical Industries, Ltd.
InventorsKoji Kumata, Masao Fukuda
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Abstract
Polyurethane resins having high rigidity and improved physical properties such as mechanical strengths and heat resistance are obtained by reacting a polyisocyanate with a polymer polyol derived from an epoxy-containing monomer, for example, glycidyl esters of unsaturated mono- and dicarboxylic acids, and a polyol, and bringing about ring-opening reaction of epoxy radicals in the presence of an epoxy curing agent, simultaneously with, or before or after the urethane-forming reaction.
Claims33
A process for producing a cellular or noncellular polyurethane having improved rigidity and heat resistance, which comprises:
- reacting at least one organic polyisocyanate with a polyol component in the presence of or in the absence of a blowing agent, at least a part of the polyol component being at least one epoxy-containing polymer polyol derived from at least one polyol having an equivalent weight of 200-4,000 and at least one ethylenically unsaturated monomer comprising an epoxy radical-containing monomer;
- and
- bringing about ring-opening reaction of the epoxy radicals, in the presence of an epoxy curing agent with or without an epoxy curing accelerator, simultaneously with, before or after the urethane-forming reaction.
Dependencies are inferred from the claim text.