Carbamate-functional polymer, curable coating composition thereof, and method of preparing the polymer

A carbamate-functional polymer comprising the reaction product of:

• a first compound having at least one hydroxyl group and at least one carbamate group;
• a carboxylic acid anhydride;
• and
• a second compound having at least one epoxy group.

A curable coating composition comprising:

• (A) a carbamate-functional polymer comprising the reaction product of;
• (i) a first compound having at least one hydroxyl group and at least one carbamate group,
• (ii) a carboxylic acid anhydride reactive with said hydroxyl group of said first compound to form an intermediate compound having at least one carboxylic acid group and said carbamate group, and
• (iii) a second compound having at least one epoxy group reactive with said carboxylic acid group of said intermediate compound for preparing said carbamate-functional polymer, and
• (B) a cross-linking agent reactive with said carbamate group of said carbamate-functional polymer.

A method of preparing a carbamate-functional polymer comprising the steps of:

• (A) providing a first compound having at least one hydroxyl group and at least one carbamate group;
• (B) reacting a carboxylic acid anhydride with the hydroxyl group of the first compound to form an intermediate compound having at least one carboxylic acid group and the carbamate group;
• and
• (C) reacting a second compound having at least one epoxy group with the carboxylic acid group of the intermediate compound to prepare the carbamate-functional polymer.

A method of coating an article, said method comprising the steps of:

• (A) applying, onto the article, a curable coating composition comprising a carbamate-functional polymer and a cross-linking agent reactive with the carbamate-functional polymer, wherein the carbamate-functional polymer is the reaction product of;
• (i) a first compound having at least one hydroxyl group and at least one carbamate group,
• (ii) a carboxylic acid anhydride reactive with the hydroxyl group of the first compound to form an intermediate compound having at least one carboxylic acid group and the carbamate group, and
• (iii) a second compound having at least one epoxy group reactive with the carboxylic acid group of the intermediate compound for preparing the carbamate-functional polymer;
• and
• (B) curing the curable coating composition to form a coated article.