Electrodepositable coating compositions including ungelled reaction products of epoxy functional polyesters and amines coated substrates and methods of electrocoating using the same
First Claim
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1. A curable coating composition comprising a curing agent and a substantially ungelled reaction product prepared from reactants comprising:
- (a) an epoxy functional polyester; and
(b) a polyoxyalkylene polyamine, wherein the epoxy functional polyester comprises a polyester having a formula selected from the group consisting of formula I;
where n is an integer ranging from about 1 to about 15, and formula II;
where R′ and
R″
represent independently selected alkyl groups, and where n is an integer ranging from about 1 to about 15.
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Abstract
The present invention is directed to electrodepositable coating compositions providing improved film flexibility and humidity resistance. The compositions contain a substantially ungelled resin or reaction product formed from reacting (i) an epoxy functional polyester with (ii) an amine. The present invention also includes a method for electrocoating a conductive substrate with the described electrodepositable coating compositions. Additionally, the present invention is directed to a conductive substrate coated according to the described method.
39 Citations
20 Claims
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1. A curable coating composition comprising a curing agent and a substantially ungelled reaction product prepared from reactants comprising:
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(a) an epoxy functional polyester; and
(b) a polyoxyalkylene polyamine, wherein the epoxy functional polyester comprises a polyester having a formula selected from the group consisting of formula I;
where n is an integer ranging from about 1 to about 15,and formula II;
where R′ and
R″
represent independently selected alkyl groups, and where n is an integer ranging from about 1 to about 15.- View Dependent Claims (2, 3, 4, 5, 6, 7, 12, 13, 14, 15, 16, 17, 18, 19, 20)
(1) the reaction product of a polyol and a polycarboxylic acid or anhydrides thereof; and
(2) an epoxy functional material.
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4. The curable coating composition of claim 3, wherein the polyol is saturated bisphenol A.
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5. The curable coating composition of claim 3, wherein the anhydride of the polycarboxylic acid is methyl hexahydrophthalic anhydride.
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6. The curable coating composition of claim 3, wherein the reaction product (1) is formed prior to reaction with the epoxy functional material (2).
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7. The curable coating composition of claim 3, wherein the epoxy functional material (2) is epichlorohydrin.
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12. The curable coating composition of claim 1, wherein the polyoxyalkylene polyamine is a diamine.
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13. The curable coating composition of claim 1, wherein the polyoxyalkylene polyamine is a primary amine.
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14. The curable coating composition of claim 1, wherein the polyoxyalkylene polyamine is represented by the formula:
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where R, R′ and
R″
are selected from the group consisting of hydrogen and alkyl-groups having about 1 to about 6 carbon atoms, where m is a number ranging from 0 to about 6, and where n is a number ranging from about 4 to about 40.
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15. The curable coating composition of claim 1, wherein a ratio of the amine groups of the polyoxyalkylene polyamine to epoxy functional groups of the functional polyester ranges from about 1.01:
- 1 to about 2;
1.
- 1 to about 2;
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16. The curable coating composition of claim 15, wherein the ratio is about 1.2:
- 1.
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17. The curable coating of claim 1, wherein the epoxy functional polyester (a) is essentially free of hydroxyl functionality.
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18. The curable coating composition of claim 1, wherein the percentage by weight of the reaction product ranges from about 0.1% to about 80% on a basis of total resin solids.
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19. The curable coating composition of claim 1, wherein the curing agent is selected from the group consisting of polyisocyanates, blocked isocyanates, aminoplasts, tricarbamoyl triazines and mixtures thereof.
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20. The curable coating composition of claim 1, further comprising a carrier material.
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8. A curable coating composition comprising a curing agent and a substantially ungelled reaction product prepared from reactants comprising:
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(a) an epoxy functional polyester; and
(b) a polyoxyalkylene polyamine, wherein the epoxy functional polyester (a) is prepared from reactants comprising;
(1) the reaction product of a polyol and a polycarboxylic acid or anhydrides thereof; and
(2) an epoxy functional material, and wherein the epoxy functional polyester (a) is represented by the following formula (I);
where n is an integer ranging from about 1 to about 15.
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9. A curable coating composition comprising a curing agent and a substantially ungelled reaction product prepared from reactants comprising:
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(a) an epoxy functional polyester; and
(b) a polyoxyalkylene polyamine, wherein the epoxy functional polyester (a) is prepared from reactants comprising;
(1) the reaction product of a polyol and a polycarboxylic acid or anhydrides thereof; and
(2) an epoxy functional material, and wherein the epoxy functional polyester (a) is represented by the following formula II;
where R′ and
R″
represent independently selected alkyl groups, and where n is an integer ranging from about 1 to about 15.- View Dependent Claims (10, 11)
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Specification
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Current AssigneePPG Industries Ohio Incorporated (Nouryon BV)
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Original AssigneePPG Industries Ohio Incorporated (Nouryon BV)
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InventorsRitter, Keith S., Moriarity, Thomas C., Eswarakrishnan, Venkatachalam
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Primary Examiner(s)Short, Patricia A.
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Application NumberUS09/545,059Time in Patent Office823 DaysField of Search525/437, 525/440, 525/443, 525/438, 204/499, 204/505, 204/504US Class Current525/440.02CPC Class CodesC08L 2666/22 Macromolecular compounds no...C09D 163/00 Coating compositions based ...C09D 5/4434 characterised by the nature...
