Process for dissolving or removing rigid polyurethane foam by contacting with 1,2-dimethyl imidazole
AssigneeTexaco Chemical Company
InventorsEdward T. Marquis, George P. Speranza, Wei-Yang Su
Life of this patent
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Abstract
A process for the dissolution of polyurethane foams is disclosed. A polyurethane foam may be dissolved, or removed from a substrate, by contacting the polyurethane foam with 1,2-dialkyl imidazole, alone or as a co-solvent.
Claims10
A process for dissolve rigid polyurethane foam, comprising the step of contacting rigid polyurethane foam with 1,2-dimethyl imidazole for a period of time sufficient to dissolve substantially all of the rigid polyurethane foam.
A process for remove rigid polyurethane foam from a substrate, comprising the step of contacting said rigid polyurethane foam with a solvent formulation containing 1,2-dimethyl imidazole for a period of time sufficient to removes substantially all of the rigid polyurethane foam from said substrate.
In a process for removing rigid polyurethane foam from a substrate by contacting said rigid polyurethane foam with a solvent in which said rigid polyurethane foam is at least partially soluble, the improvement comprising substituting 1,2-dimethyl imidazole for a portion of said solvent and contacting said foam with said solvent and 1,2-dimethyl imidazole for a period of time sufficient to remove substantially all of the rigid polyurethane foam from said substrate.
Dependencies are inferred from the claim text.