초록 ▼

Polyurethane resins having high rigidity and improved physical properties, such as mechanical strengths and heat resistance are obtained by reacting a polyisocyanate with a polyol component comprising a pendant hydroxyl-containing polymer polyol, of high polymer content, derived from a polyol and a

Polyurethane resins having high rigidity and improved physical properties, such as mechanical strengths and heat resistance are obtained by reacting a polyisocyanate with a polyol component comprising a pendant hydroxyl-containing polymer polyol, of high polymer content, derived from a polyol and a mixture comprising a hydroxyl-containing monomer and an unsaturated nitrile, or a combination of said polymer polyol with an epoxy-containing polymer polyol.

대표청구항 ▼

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, at least a part of the polyol component being a pendant hydroxyl radical-containing polymer polyol having

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, at least a part of the polyol component being a pendant hydroxyl radical-containing polymer polyol having a polymer content of at least 30% by weight, said polymer polyol being derived from at least one polyol having an equivalent weight of 200-4,000 and unsaturated monomers, the polymer portion of said polymer polyol comprisng monomer units of (a) 5-90% of at least one hydroxyl radical-containing monomer, selected from the group consisting of (1) esters of an ethylenically unsaturated carboxylic acid with a glycol, (2) polymerizable unsaturated aliphatic alcohols, (3) furfuryl alcohol, and (4) N-alkylol acrylamides; (b) 5-90% of at least one unsaturated nitrile; (c) 0-60% of at least one epoxy radical-containing monomer; and (d) 0-60% of at least one other monomer, based on the total weight of monomers, wherein the total amount of said epoxy radical-containing monomer and said other monomer is 0-60%.