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US 2006/0223967 A1Published application
Novel polyurea isocyanates
OwnerMark Connerinventor
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Abstract
The present invention provides novel prepolymers comprising a blend of a toluene diisocyanate prepolymer, formed from a toluene diisocyanate and a polyol, and a diphenylmethane diisocyanate or a diphenylmethane diisocyanate quasi-prepolymer. The present invention also provides polyurea elastomers comprising the novel prepolymer blends reacted with an amine-terminated chain extender or cross-linker to form the polyurea elastomer. The present invention further provides methods for preparing the novel prepolymers and the polyurea elastomers. The novel polyurea elastomers have improved modulus, tensile properties, adhesion, and surface characteristics and may be applied by spraying, troweling, casting, or caulking.
Claims24
A prepolymer blend comprising:
- a) from about 10% to about 90% of a toluene diisocyanate prepolymer, by weight of the prepolymer blend, comprising:
- i) from about 10% to about 85% of a toluene diisocyanate, by weight of the toluene diisocyanate prepolymer;
- and
- ii) from about 15% to about 90% of a polyol, by weight of the toluene diisocyanate prepolymer;
- wherein the functionality of the polyol is from about 2 to about 3 and is selected such that the toluene diisocyanate prepolymer has an % NCO content from about 1.5% to about 14%, a viscosity from about 50 cps to about 5,000 cps at 70° C., a residual free monomeric toluene diisocyanate content of less than about 0.5%, and an oligomer content less than about 40%;
- and
- b) from about 10% to about 90% of a diphenylmethane diisocyanate or a diphenylmethane diisocyanate quasi-prepolymer, by weight of the prepolymer blend;
- wherein the prepolymer blend has an % NCO content from about 5% to about 25%.
5 more elements
A polyurea elastomer comprising:
- A) from about 10% to about 90% of a premixture blend, by weight of the polyurea elastomer, of:
- a) from about 10% to about 90% of a toluene diisocyanate prepolymer, by weight of the prepolymer blend, comprising:
- i) from about 10% to about 85% of a toluene diisocyanate, by weight of the toluene diisocyanate prepolymer;
- and
- ii) from about 15% to about 90% of a polyol, by weight of the toluene diisocyanate prepolymer;
- wherein the functionality of the polyol is. from about 2 to about 3 and is selected such that the toluene diisocyanate prepolymer has an % NCO content from about 1.5% to about 14%, a viscosity from about 50 cps to about 5,000 cps at 70° C., a residual free monomeric toluene diisocyanate content of less than about 0.5%, and an oligomer content less than about 40%;
- and
- b) from about 10% to about 90% of a diphenylmethane diisocyanate or a diphenylmethane diisocyanate quasi-prepolymer, by weight of the prepolymer blend;
- wherein the prepolymer blend has an % NCO content from about 5% to about 25%;
- and
- B) from about 10% to about 90% of an amine-terminated chain extender or cross-linker, by weight of the polyurea elastomer.
8 more elements
A method for preparing a prepolymer blend comprising:
- a) providing a toluene diisocyanate prepolymer prepared by reacting:
- i) from about 10% to about 85% of a toluene diisocyanate, by weight of the toluene diisocyanate prepolymer;
- and
- ii) from about 15% to about 90% of a polyol, by weight of the toluene diisocyanate prepolymer;
- and
- iii) removing monomeric toluene diisocyanate from the toluene diisocyanate prepolymer formed in i) and ii);
- wherein the functionality of the polyol is from about 2 to about 3 and is selected such that the toluene diisocyanate prepolymer has an % NCO content from about 1.5% to about 14%, a viscosity from about 50 cps to about 5,000 cps at 70° C., a residual free monomeric toluene diisocyanate content of less than about 0.5%, and an oligomer content less than about 40%;
- and
- b) blending from about 10% to about 90% of the toluene diisocyanate prepolymer from a) with from about 10% to about 90% of a diphenylmethane diisocyanate or a diphenylmethane diisocyanate quasi-prepolymer, by weight of the prepolymer blend;
- wherein the prepolymer blend has an % NCO content from about 5% to about 25%.
7 more elements
A method for preparing a polyurea elastomer comprising the steps of:
- A) providing a premixture blend of:
- a) a toluene diisocyanate prepolymer prepared by reacting:
- i) from about 10% to about 85% of a toluene diisocyanate, by weight of the toluene diisocyanate prepolymer;
- and
- ii) from about 15% to about 90% of a polyol, by weight of the toluene diisocyanate prepolymer;
- and
- iii) removing monomeric toluene diisocyanate from the toluene diisocyanate prepolymer formed in i) and ii);
- wherein the functionality of the polyol is from about 2 to about 3 and is selected such that the toluene diisocyanate prepolymer has an % NCO content from about 1.5% to about 14%, a viscosity from about 50 cps to about 5,000 cps at 70° C., a residual free monomeric toluene diisocyanate content of less than about 0.5%, and an oligomer content less than about 40%;
- and
- b) blending from about 10% to about 90% of the toluene diisocyanate prepolymer from a) with from about 10% to about 90% of a diphenylmethane diisocyanate or a diphenylmethane diisocyanate quasi-prepolymer, by weight of the prepolymer blend;
- wherein the prepolymer blend has an % NCO content from about 5% to about 25%;
- and
- B) reacting from about 10% to about 90% of the premixture blend from A) with from about 10% to about 90% of an amine-terminated chain extender or cross-linker, by weight of the polyurea elastomer, to form the polyurea elastomer.
10 more elements
Dependencies are inferred from the claim text.