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AssigneeBayer Aktiengesellschaft
InventorsDouglas A. Wicks, Lyuba K. Gindin, Philip E. Yeske, E. Haakan Jonsson
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The present invention relates to aspartate-functional hydantoin prepolymers prepared by reacting a polyisocyanate having a functionality of at least 1.8 with a polyaspartate corresponding to the formula ##STR1## wherein X represents an organic group which has a valency of n and is inert towards isocyanate groups at a temperature of 100.degree. C. or less, and R.sub.1 and R.sub.2 may be the same or different and represent optionally substituted hydrocarbon radicals, R.sub.3 and R.sub.4 may be identical or different and represent hydrogen or organic groups which are inert towards isocyanate groups at a temperature of 100.degree. C. or less and n has a value of 2 to 6, preferably 2 to 4 and more preferably 2. The present invention is also directed to compositions suitable for the production of coatings, adhesives, elastomers, potting compounds or composite matrices containing these polyhydantoin prepolymers in combination with optionally blocked polyisocyanates.
An aspartate-functional hydantoin prepolymer prepared by reacting, at an equivalent ratio of aspartate groups to isocyanate groups of 1.05:1 to 10:1, a polyisocyanate having a functionality of at least 1.8 with a polyaspartate corresponding to the formula ##STR5## wherein X represents an organic group which has a valency of n and is inert towards isocyanate groups at a temperature of 100.degree. C. or less, and
An aspartate-functional hydantoin prepolymer corresponding to the formula ##STR6## wherein X represents an organic group which has a valency of 2 and is inert towards isocyanate groups at a temperature of 100.degree. C. or less, and
Dependencies are inferred from the claim text.