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US 6,583,314 B2Granted
Stable isocyanate formulations
AssigneeBayer Aktiengesellschaft
InventorsRick L. Adkins, William E. Slack, Edward P. Squiller
Life of this patent
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Abstract
The pot life of an isocyanate formulation is controlled by including a chain extender having (a) at least two secondary amine groups, (b) no primary amine groups, and (c) a reactivity low enough that the chain extender will not react sufficiently with isocyanate groups present in the isocyanate formulation to increase the viscosity of the isocyanate formulation to more than 2000 mPa·s within 5 seconds in the isocyanate formulation.
Claims10
A stable isocyanate formulation comprising
- a) a diisocyanate or polyisocyanate and
- b) a chain extender having
- (i) at least two secondary amine groups,
- (ii) no primary amine groups, and
- (iii) a reactivity low enough that the chain extender will not react with the diisocyanate or polyisocyanate a) sufficiently to increase the viscosity of the diisocyanate or polyisocyanate to 2,000 mPa·s within 5 seconds.
2 more elements
Dependencies are inferred from the claim text.