Polyurethane powder coatings
First Claim
Patent Images
1. A powder coating composition in the form of an intimate blend, in a finely divided form, comprisingA. a blend of resins comprisingabout 10 to 40 percent by weight of a polyester resin having a glass temperature of at least 55°
- C., a hydroxyl number of about 190 to 320, and an inherent viscosity of about 0.1 to 0.5 dL/g determined at 25°
C. in a (60/40 by weight) mixture of phenol/tetra-chloroethane at a concentration of 0.5 g/100 ml;
said polyester comprised ofa. diacid residues comprised of at least 50 mole percent of isophthalic acid residues; and
b. diol residues comprised of from about 50 to 100 mole percent of residues of tris(hydroxyethyl)isocyanurate; and
2. about 60 to 90 percent by weight of a polyester resin comprised of at least 70 mole percent of residues of terephthalic acid and 2,2-dimethyl-1,3-propanediol and having a Tg of 55°
to 85°
C., a hydroxyl number of 30 to 80, and an inherent viscosity of about 0.1 to 0.3 dL/g; and
B. a cross-linking effective amount of a blocked polyisocyanate.
2 Assignments
0 Petitions
Accused Products
Abstract
This invention relates to thermosetting powder coatings formulated with a polyisocyanate and a blend of a hydroxylated polyester resin having a low hydroxyl number and a hydroxylated resin based on tris(hydroxyethyl)isocyanurate having a high hydroxyl number. Powder coatings from this blend exhibit high hardness and good caking stability.
11 Citations
16 Claims
-
1. A powder coating composition in the form of an intimate blend, in a finely divided form, comprising
A. a blend of resins comprisingabout 10 to 40 percent by weight of a polyester resin having a glass temperature of at least 55° - C., a hydroxyl number of about 190 to 320, and an inherent viscosity of about 0.1 to 0.5 dL/g determined at 25°
C. in a (60/40 by weight) mixture of phenol/tetra-chloroethane at a concentration of 0.5 g/100 ml;
said polyester comprised ofa. diacid residues comprised of at least 50 mole percent of isophthalic acid residues; and b. diol residues comprised of from about 50 to 100 mole percent of residues of tris(hydroxyethyl)isocyanurate; and 2. about 60 to 90 percent by weight of a polyester resin comprised of at least 70 mole percent of residues of terephthalic acid and 2,2-dimethyl-1,3-propanediol and having a Tg of 55°
to 85°
C., a hydroxyl number of 30 to 80, and an inherent viscosity of about 0.1 to 0.3 dL/g; andB. a cross-linking effective amount of a blocked polyisocyanate. - View Dependent Claims (2, 3, 4, 14)
- C., a hydroxyl number of about 190 to 320, and an inherent viscosity of about 0.1 to 0.5 dL/g determined at 25°
-
5. A powder coating composition in the form of an intimate blend, in a finely divided form, comprising
A. a blend of resins comprisingabout 10 to 40 percent by weight of a polyester resin having a glass temperature of at least 55° - C., a hydroxyl number of about 190 to 320, and an inherent viscosity of about 0.1 to 0.5 dL/g determined at 25°
C. in a (60/40 by weight) mixture of phenol/tetra-chloroethane at a concentration of 0.5 g/100 ml;
said polyester comprised ofa. diacid residues comprised of at least 75 mole percent of isophthalic acid residues; and b. diol residues comprised of from about 75 to 100 mole percent of residues of tris(hydroxyethyl)isocyanurate; and 2. about 60 to 90 percent by weight of a polyester resin comprised of at least 70 mole percent of residues of terephthalic acid and 2,2-dimethyl-1,3-propanediol and having a Tg of 55°
to 85°
C., a hydroxyl number of 30 to 80, and an inherent viscosity of about 0.1 to 0.3 dL/g; andB. a cross-linking effective amount of a blocked polyisocyanate. - View Dependent Claims (6, 7, 8, 15)
- C., a hydroxyl number of about 190 to 320, and an inherent viscosity of about 0.1 to 0.5 dL/g determined at 25°
-
9. A powder coating composition in the form of an intimate blend, in a finely divided form, comprising
A. a blend of resins comprising
-
10. about 15 to 25 percent by weight of a polyester resin having a glass temperature of at least 55°
- C., a hydroxyl number of about 190 to 320, and an inherent viscosity of about 0.1 to 0.5 dL/g determined at 25°
C. in a (60/40 by weight) mixture of phenol/tetra-chloroethane at a concentration of 0.5 g/100 ml;
said polyester comprised ofa. diacid residues comprised of at least 90 mole percent of isophthalic acid residues; and b. diol residues comprised of from about 80 to 100 mole percent of residues of tris(hydroxyethyl)isocyanurate; and 2. about 75 to 85 percent by weight of a polyester resin comprised of at least 70 mole percent of residues of terephthalic acid and 2,2-dimethyl-1,3-propanediol and having a Tg of 55°
to 85°
C., a hydroxyl number of 30 to 80, and an inherent viscosity of about 0.1 to 0.3 dL/g; andB. a cross-linking effective amount of a blocked polyisocyanate.
- C., a hydroxyl number of about 190 to 320, and an inherent viscosity of about 0.1 to 0.5 dL/g determined at 25°
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneePPG Industries Incorporated (Nouryon BV)
-
Original AssigneeEastman Chemical Company
-
InventorsPhillips, Brian S., Barbee, Robert B.
-
Primary Examiner(s)Short, Patricia A.
-
Application NumberUS08/291,077Time in Patent Office246 DaysField of Search525/440, 525/934US Class Current525/440.02CPC Class CodesC08G 18/4202 Two or more polyesters of d...C08G 18/4661 containing three nitrogen a...C08G 18/798 containing urethdione groupsC08G 18/8067 phenolic compoundsC08G 18/8074 LactamsC08G 2150/20 Compositions for powder coa...C08L 2666/28 Non-macromolecular organic ...C08L 67/02 Polyesters derived from dic...C09D 167/02 Polyesters derived from dic...Y10S 525/934 Powdered coating compositionY10T 428/31551 Of polyamidoester [polyuret...Y10T 428/31605 Next to free metal
