Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1975-07-24
1977-02-22
Jacobs, Lewis T.
Coating processes
With post-treatment of coating or coating material
Heating or drying
260 775AM, 260 775CH, 427388R, 427393, B05D 302
Patent
active
040093077
ABSTRACT:
Coating compositions which form polyurea-urethane coatings having excellent chemical and physical properties are prepared by blending (a) from about 2 percent to about 80 percent by weight of resin solids of an isocyanate-terminated polyurethane prepolymer consisting essentially of the reaction product of an organic diisocyanate and an organic diol, wherein said prepolymer is prepared at an NCO/OH ratio of from 2:1 to about 4:3, (b) from about 2 percent to about 60 percent by weight resin solids of an isocyanate-terminated polyurethane prepolymer consisting essentially of the reaction product of 1-isocyanato-3-isocyanatomethyl-3,5,5-trimethylcyclohexane and a mixture of aliphatic polyols wherein at least about 30 mole percent of the total hydroxyl groups supplied by said mixture of polyols is supplied by an aliphatic polyol having at least three hydroxyl groups and wherein said prepolymer is prepared at an NCO/OH ratio of at least 1.2:1; and (c) from about 20 percent to about 50 percent by weight of resin solids of a polyketimine material consisting essentially of the reaction product of a diketimine compound having the general formula: ##STR1## wherein R is an alkylene group of 2 to 6 carbon atoms and R.sub.1 and R.sub.2 are hydrogen or organic radicals having from 1 to 8 carbon atoms, and a polyisocyanate material selected from the group consisting of an isocyanate-terminated polyurethane prepolymer formed by reacting an organic diisocyanate and an organic diol at an NCO/OH ratio of from about 2:1 to about 4:3 or mixtures of isocyanate-terminated prepolymers and unreacted diisocyanate formed by reacting an organic diisocyanate and an organic diol at an NCO/OH ratio of from about 3:1 to about 5:1, wherein a sufficient amount of said diketimine is reacted with said polyisocyanate compound to produce a polyketimine compound containing essentially no free NCO groups.
The polyurea-urethane coatings formed from the compositions of the invention have excellent chemical and physical properties and are particularly useful as coatings for wood.
REFERENCES:
patent: 3539424 (1970-11-01), Tashlick
patent: 3560246 (1971-02-01), Payne et al.
patent: 3793417 (1974-02-01), Erikson et al.
Erikson J. Alden
Niederst Ken W.
Jacobs Lewis T.
PPG Industries Inc.
Troy Frank J.
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