Digestion products of polyalkylene terephthalate polymers and polycarboxylic acid-containing polyols and polymeric foams obtained therefrom
AssigneeJim Walter Resources, Inc.
InventorsRichard K. Hallmark, Michael J. Skowronski, William D. Stephens
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Abstract
A storage stable polyester polyol mixture is prepared by digesting polyalkylene terephthalate, particularly polyethylene terephthalate, with a digesting medium comprising a polycarboxylic acid component-containing polyol, wherein the polycarboxylic acid component has ring units with two ##STR1## groups on adjacent or alternate ring positions, the ring unit content of the polycarboxylic acid component being sufficient for improved storage stability of the digestion product. The polyester polyol mixture is useful in the preparation of cellular foam materials, particularly polyisocyanurate and polyurethane foams.
Claims52
A polyisocyanurate foam comprising the reaction product of an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol, wherein from about 5 to 100 weight percent of the Polyol comprises the reaction product obtained by digesting polyalkylene terephthalate with a digesting medium comprising a polycatboxylic acid component-containing polyol derived from the polycarboxylic acid component and a digesting polyol component, wherein the polycarboxylic acid component has ring units with two ##STR10## groups on adjacent of alternate ring positions, the ring unit content of the polycarboxylic acid component being sufficient for improved storage stability of the digestion product.
A polyurethane foam comprising the reaction product of an organic polyisocyanate, a blowing agent, a catalyst and a polyol, wherein from about 5 to 100 weight percent of the polyol comprises the reaction product obtained by digesting polyalkylene terephthalate with a digesting medium comprising a polycarboxylic acid component-containing polyol derived from the polycarboxylic acid component and a digesting polyol component, wherein the polycarboxylic acid component has ring units with two ##STR12## groups on adjacent or alternate ring positions, the ring unit content of the polycarboxylic acid component being sufficient for improved storage stability of the digestion product.
Dependencies are inferred from the claim text.