Patent ID: 7838078

Claim:
A curable coating composition comprising a film-forming binder and an organic liquid carrier; wherein the binder comprises: (A) 5 to 60% by weight of a curable film-forming material having a plurality of carbamate groups; (B) 15 to 45% by weight of one or more curing agents for component (A) comprising at least one monomeric alkylated melamine formaldehyde resin; (C) 10 to 50% by weight of a hydroxy functional silane component containing at least one hydrolyzable silane group and having a hydroxyl value of 45 mg KOH/g or above; and (D) a second hydroxy functional silane component containing at least one hydrolyzable silane group and having a hydroxyl value of 44 mg KOH/g or less; wherein the percentages by weight are based on the weight of the binder; and wherein the hydrolyzable silane groups of said (C) hydroxy functional silane component and said (D) second hydroxy functional silane component are derived from monomers that are selected from the group consisting of structures according to (1), (2) and a combination thereof; wherein R is CH 3 , CH 3 CH 2 , CH 3 O, or CH 3 CH 2 O; R 1 and R 2 are independently CH 3 or CH 3 CH 2 ; and R 3 is either H, CH 3 , or CH 3 CH 2 ; and n is 0 or a positive integer from 1 to 10; wherein R is CH 3 , CH 3 CH 2 , CH 3 O, or CH 3 CH 2 O; R 1 and R 2 are independently CH 3 or CH 3 CH 2 ; R 4 is H or CH 3 , R 5 is an alkylene group having 1-8 carbon atoms and n is a positive integer from 1-8 and wherein component D is present and is present at up to a maximum of 15% by weight based on the weight of the binder.