Inventors:
Eduard Mayer - Dormagen, DE
Thomas Muenzmay - Dormagen, DE
Yuliya Berezkin - Pittsburgh PA, US
Poli Yu - Wexford PA, US
Richard Roesler - Wexford PA, US
Mary Crisci - Aliquippa PA, US
International Classification:
C08G018/00, C08G018/10, C08G018/32
US Classification:
528/059000, 528/076000, 528/068000
Abstract:
Isocyanate-functional polyurethane prepolymers and aqueous dispersions therefrom which are useful for the production of flat materials having excellent resistance to alcoholic solvents are described. The prepolymers are prepared by reacting: A) an isocyanate selected from the group consisting of i) an aliphatic and/or a cycloaliphatic isocyanate, ii) a mixture of an aromatic isocyanate and an aliphatic and/or a cycloaliphatic isocyanate, B) a di- or polyhydroxy compound having a number average molecular weight of from 700 to about 16,000, and C) optionally, a dihydroxy and/or polyhydroxyl compound having a number average molecular weight of less than 700, with the provisos that a) at least one of components A), B or C) has a functionality of more than 2 and b) if both component A) and component B) are difunctional, component C) cannot be a trihydroxy component of the formula: where R is a saturated straight chain or branched chain aliphatic group of from 2 to 8 carbon atoms.