TWO-PART NON-ISOCYANATE PRIMER COMPOSITIONS

1 . A two-part (2 k) isocyanate-free primer composition comprising:

a first part comprising a polyester and a melamine formaldehyde resin; and

a second part comprising an unblocked acid catalyst.

2 . The primer composition of claim 1 wherein the first part comprises a first portion of the polyester and the second part comprises a second portion of the polyester.

3 . The primer composition of claim 1 wherein the first part comprises a first portion of the polyester, wherein the second part comprises a second portion of the polyester, and wherein the second part consists essentially of the unblocked acid catalyst and the second portion of the polyester.

4 . The primer composition of claim 1 wherein the unblocked acid catalyst of the second part is aromatic sulfonic acid.

5 . The primer composition of claim 1 wherein the unblocked acid catalyst of the second part is dodecylbenzenesulfonic acid (DDBSA).

6 . The primer composition of claim 1 wherein the primer composition is curable at a temperature of from about 100 to about 110° C.

7 . The primer composition of claim 1 wherein the first part is substantially free of acid catalyst.

8 . The primer composition of claim 1 wherein the first part further comprises hydrocarbon solvent and alcohol solvent.

9 . The primer composition of claim 8 wherein the first part further comprises at least one pigment and at least one organic solvent.

10 . The primer composition of claim 1 wherein the first part comprises melamine formaldehyde resin and butylated melamine formaldehyde resin, alcohol solvent, aromatic hydrocarbon solvent, flow additive, and pigment.

11 . A two-part (2 k) low temperature curable primer composition comprising:

a first part comprising a first portion of a crosslinkable component and a crosslinking component (melamine); and

a second part comprising a second portion of the crosslinkable component and an unblocked acid catalyst, wherein the composition is curable at a temperature of less than about 120° C.

12 . The primer composition of claim 11 wherein the crosslinking component is a melamine formaldehyde resin comprising a monomeric melamine, a polymeric melamine, or any mixture thereof.

13 . The primer composition of claim 11 wherein the crosslinking component comprises a melamine formaldehyde resin and a butylated melamine formaldehyde resin.

14 . The primer composition of claim 11 wherein the crosslinking component comprises from about 15 to about 20 percent by weight of the primer composition, based on the total weight of the primer composition.

15 . The primer composition of claim 11 wherein the crosslinkable component is polyester.

16 . The primer composition of claim 15 wherein the polyester comprises from about 25 to about 50 percent by weight of the primer composition, based on the total weight of the primer composition.

17 . The primer composition of claim 15 wherein the polyester comprises from about 30 to about 40 percent by weight of the primer composition, based on the total weight of the primer composition.

18 . The primer composition of claim 11 wherein the crosslinking component is melamine, wherein the crosslinkable component is polyester, and wherein the polyester and melamine are provided in a polyester:melamine weight ratio of from about 1.5:1 to about 2:1.

19 . The primer composition of claim 11 wherein the unblocked acid catalyst comprises from about 0.2 to about 2 percent by weight of the primer composition, based on the total weight of the primer composition.

20 . A method for providing a primer coating on an automotive body component, the method comprising:

mixing a first part comprising polyester and melamine with a second part comprising an unblocked acid catalyst to form a mixed composition;

applying the mixed composition to the automotive body component; and

curing the mixed composition on the automotive body component at a temperature of less than about 120° C.