Rigid foams prepared from treated toluene diisocyanate residue
AssigneeThe Dow Chemical Company
InventorsJohn L. Nafziger, Steven B. Lowenkron, Charles E. Koehler, Debkumar Bhattacharjee
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Abstract
A method of treating toluene diisocyanate distillation residues comprising reacting the residues with at least about 0.5 equivalents, based on hydrolyzable chloride concentration of the residues, of an epoxy compound at a temperature of from about 155 to about 220.degree. C. to produce a treated distillation residue having a hydrolyzable chloride level of less than about 800 parts per million (ppm) is taught. The product of the method is useful, for instance, in producing rigid foams with low K Factors.
Claims46
A method of treating toluene diisocyanate distillation residues comprising reacting the residues with at least about 0.5 equivalents, based on hydrolyzable chloride concentration in the residues, of an epoxy compound at a temperature of from about 155.degree. C. to about 220.degree. C. to produce a treated distillaton residue having a hydrolyzable chloride concentration of less than about 800 parts per million (ppm).
A treated toluene diisocyanate distillation residue which is the product of reacting the residue with an epoxy compound at a temperature of from about 155.degree. C. to about 220.degree. C., said treated toluene diisocyanate distillation residues having a hydrolyzable chloride concentration of less than about 800 parts per million (ppm).
A polymer prepared by reacting a reaction mixture containing components:
- (a) an active hydrogen compound or mixture thereof;
- and
- (b) a polyisocyanate component containing
- (1) from about 1 to about 100 weight percent based on total weight of polyisocyanate component (b) of a treated toluene diisocyanate distillation residue which is the product of reacting the residue with an epoxy compound at a temperature of from about 155.degree. C. to about 220.degree. C., said treated toluene diisocyanate distillation residue having a hydrolyzable chloride level of less than about 800 parts per million (ppm).
A process for preparing a polymer by reacting a reaction mixture containing components:
- (a) an active hydrogen compound or mixture thereof;
- and
- (b) a polyisocyanate component containing
- (1) from about 1 to about 100 weight percent based on total weight of polyisocyanate component (b) of a treated toluene diisocyanate distillation residue which is the product of reacting the residue with an epoxy compound at a temperature of from about 155.degree. C. to about 220.degree. C., said treated toluene diisocyanate distillation residue having a hydrolyzable chloride level of less than about 800 parts per million (ppm).
Dependencies are inferred from the claim text.