Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1979-09-18
1981-02-17
Welsh, Maurice J.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
4273935, 528 48, 528 57, 528 67, 528 76, 528 77, 528 81, 528 83, 528 84, 528 85, 525457, C08L 7504
Patent
active
042514274
ABSTRACT:
A substantially solvent-free fast low temperature curing polyurethane coating composition is disclosed as well as a procedure for synthesizing it and a procedure for applying it to a flexible substrate. It has a long shelf-life yet cures in about 1 to 5 minutes at temperatures of between about 80.degree. and 180.degree. C. to give a flexible coating. The composition is a mixture of a polyisocyanate melting at more than about 100.degree. C. and a hydroxyl bearing polyurethane prepolymer based upon branched polyethers, monomeric glycols, and polyamines made with a deficit of polyisocyanate. The composition includes an isocyanate addition catalyst and a sodium aluminum silicate type molecular sieve and may include a polyester polyol as an additive or a reactant in forming the prepolymer.
REFERENCES:
patent: 3326844 (1967-06-01), Gruber
patent: 3475200 (1969-10-01), Kallert et al.
patent: 4066397 (1978-01-01), Carroll
patent: 4094842 (1978-06-01), Wenzel et al.
patent: 4154716 (1979-05-01), Olstowski et al.
Recker Klaus
Reinecke Gerd
Bayer Aktiengesellschaft
Harsh Gene
Pope Lawrence S.
Welsh Maurice J.
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