Thermosetting high solids solvent-based polyester-urethane one-component coating compositions
AssigneePPG Industries, Inc.
InventorsWen-Hsuan Chang, Ronald R. Ambrose, David T. McKeough, Samuel Porter, Jr., Delano R. Eslinger
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Abstract
This invention encompasses a high solids, solvent-based, thermosetting composition having the necessary hardness and flexibility that make it an effective coating for both elastomeric and hard metal substrates. The composition comprises a polyester-urethane polyol and a curing agent such as an aminoplast.
Claims25
A high solids, solvent-based, thermosetting, one-component coating composition having a sprayability of at least 40 percent, which when cured is flexible and hard in that when the coating composition is deposited on an elastomeric substrate and cured, the coated substrate can be bent around a 1/2-inch mandrel with the coating facing outwardly and the coating exhibits substantially no breaks or cracks when tested at 35.degree. F.;
- and in that when the coating composition is deposited on a metallic substrate and cured, the coated substrate has a Sward hardness of at least 14;
- said coating composition contains a film-former comprising a polyester-urethane polyol and a curing agent;
- the polyester-urethane polyol has a hydroxyl value of at least 50 and comprises:
- (A) about 60 to 95 percent by weight acyclic moieties, and optionally
- (B) up to about 30 percent by weight cyclic moieties;
- the sum of the weight percentage of cyclic moieties and the weight percentage of urethane moieties multiplied by 3 is from about 15 to 65.
A high solids, solvent-based, thermosetting, one-component coating composition having a sprayability of at least 40 percent, which when cured is weather-durable, and flexible and hard in that when the coating composition is deposited on an elastomeric substrate and cured, the coated substrate can be bent around a 1/2-inch mandrel with the coating facing outwardly and the coating exhibits substantially no breaks or cracks when tested at 20.degree. F.;
- and in that when the coating composition is deposited on a metallic substrate and cured, the coated substrate has a Sward hardness of at least 18;
- said coating composition contains a film-former comprising a polyester-urethane polyol and a curing agent;
- the polyester-urethane polyol has a hydroxyl value of at least 80 and is prepared by reacting:
- (1) an aliphatic diisocyanate containing alkyl branching with
- (2) a polyester polyol formed from reacting:
- (a) hexahydrophthalic acid or alkyl-substituted hexahydrophthalic acid with
- (b) a mixed diol comprising:
- (i) a straight chain aliphatic diol containing from 2 to 20 carbon atoms,
- (ii) an aliphatic diol containing neopentyl group branching;
- said polyester-urethane polyol containing 70 to 95 percent by weight acyclic moieties and the sum of the weight percentage of cyclic moieties and the weight percentage of urethane moieties multiplied by 3 is from 15 to 65.
Dependencies are inferred from the claim text.