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US 5,160,792 AGranted
Thermosetting powder coating compositions
AssigneeEastman Kodak Company
InventorsRobert B. Barbee, Brian S. Phillips
Life of this patent
Estimating the term…
Abstract
Provided are novel thermosetting powder coating compositions comprised of blends of certain amorphous polyesters, polyesters containing 1,4- and 1,3-bis(2-hydroxyethoxy)-benzene, and cross-linking agents. Coatings provided therefrom possess good gloss, impact strength, and flexibility.
Claims12
A thermosetting powder coating composition which comprises an intimate blend comprising
- (1) a blend of polymers having free hydroxy groups comprised of
- (a) about 10 to 70 weight percent of an amorphous polyester having a glass transition temperature (Tg) of greater than 40.degree. C., a hydroxyl number of about 20 to 200 and an inherent viscosity of about 0.1 to 0.5;
- said amorphous polyester comprised of diol and dicarboxylic acid residues, said diol residues selected from a group consisting of residues of ethylene glycol, propylene glycol, 1,3-propanediol, 2,4-dimethyl-2-ethylhexane-1,3-diol, 2,2-dimethyl-1,3-propanediol, 2-ethyl-2-butyl-1,3-propanediol, 2-ethyl-2-isobutyl-1,3-propanediol, 1,3-butanediol, 1,3-butanediol, 1,5-pentanediol, thiodiethanol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, and 1,4-xylylenediol;
- and
- (b) about 90 to 30 weight percent of an amorphous polyester having a Tg of at least 50.degree. C., a hydroxyl number of about 20 to 200, and an inherent viscosity of about 0.1 to 0.5 which comprises
- (i) diacid residues comprising at least 50 mole percent terephthalic acid residues;
- and
- (ii) diol residues comprising at least 90 mole percent of 2,2-dimethyl-1,3-propanediol and 1,4-bis(2-hydroxyethoxy)benzene residues wherein the mole ratio of 2,2-dimethyl-1,3-propanediol residues to 1,4-bis(2-hydroxyethoxy)benzene residues is about 4:1 to 0.7:1;
- or
- (iii) diol residues comprising at least 90 mole percent of 2,2-dimethyl-1,2-propanediol and 1,3-bis(2-hydroxyethoxy)benzene residues wherein the mole ratio of 2,2-dimethyl-1,3-propanediol residues to 1,3-bis(2-hydroxyethoxy)benzene residues is about 4:1 to 0.7:1;
- or a mixture of (ii) and (iii);
- and
- (2) a cross-linking effective amount of a cross-linking agent.
10 more elements
A thermosetting powder coating composition which comprises an intimate blend comprising
- (1) a blend of polymers having free hydroxy groups comprised of
- (a) about 20 to 60 weight percent of an amorphous polyester having a glass transition temperature (Tg) of greater than 40.degree. C., a hydroxyl number of about 20 to 200 and an inherent viscosity of about 0.1 to 0.5;
- said amorphous polyester comprised of diol and dicarboxylic acid residues, said diol residues selected from a group consisting of residues of ethylene glycol, propylene glycol, 1,3-propanediol, 2,4-dimethyl-2-ethylhexane-1,3-diol, 2,2-dimethyl-1,3-propanediol, 2-ethyl-2-butyl-1,3-propanediol, 2-ethyl-2-isobutyl-1,3-propanediol, 1,3-butanediol, 1,3-butanediol, 1,5-pentanediol, thiodiethanol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, and 1,4-xylylenediol;
- and
- (b) about 80 to 40 weight percent of an amorphous polyester having a Tg of at least 50.degree. C., a hydroxyl number of about 20 to 200, and an inherent viscosity of about 0.1 to 0.5 which comprises
- (i) diacid residues comprising at least 50 mole percent terephthalic acid residues;
- and
- (ii) diol residues comprising at least 90 mole percent of 2,2-dimethyl-1,3-propanediol and 1,4-bis(2-hydroxyethoxy)benzene residues wherein the mole ratio of 2,2-dimethyl-1,3-propanediol residues to 1,4-bis(2-hydroxyethoxy)benzene residues is about 4,1to 0.7:1;
- or
- (iii) diol residues comprising at least 90 mole percent of 2,2-dimethyl-1,3-propanediol and 1,3-bis(2-hydroxyethoxy)benzene residues wherein the mole ratio of 2,2-dimethyl-1,3-propanediol residues to 1,3-bis(2-hydroxyethoxy)benzene residues is about 4:1 to 0.7:1;
- or a mixture of (ii) and (iii);
- and
- (2) a cross-linking effective amount of cross-linking agent.
10 more elements
Dependencies are inferred from the claim text.