Flexible aminoplast-curable film-forming compositions and composite coating

A flexible, curable film-forming composition comprising:

• A) at least three polymeric components each having functional groups selected from the group consisting of, one from each of (i), (ii) and (iii):
• (i) polyether polymer containing a plurality of terminal or pendant carbamate groups of the structure:
• ##STR5## present in the film-forming composition in amounts of 5 to 40 percent by weight based on the total weight of resin solids in the film-forming composition;
• (ii) at least one of the polymers selected from the group consisting of:
• polyester polymer, polyurethane polymer, and acrylic polymer, each of these polymers, when present, contains a plurality of carbamate groups of Structure I selected from terminal carbamate groups, pendant carbamate groups, and terminal and pendant carbamate groups, and polyurethane polyol having a plurality of hydroxyl groups selected from terminal, pendant, and terminal and pendant hydroxyl groups and which, optionally, has a plurality of carbamate groups of Structure I selected from the group consisting of terminal and pendant carbamate groups and mixtures thereof, and mixtures of these polymers;
• (iii) a polymeric material selected from the group consisting of urethane oligomers having groups selected from carbamate group of Structure I that are pendant, terminal, and pendant and terminal, and an acrylic polymer containing a plurality of amide groups and, optionally, a plurality of terminal, pendant, or terminal and pendant carbamate groups of Structure I and mixtures thereof and
• (B) an aminoplast crosslinking agent containing methylol groups, methylol ether groups, or mixtures thereof.

A multi-component coating composition comprising the following components:

• (I) a pigmented film-forming composition and, as a separate component,
• (II) a clear film-forming composition wherein the clear film-forming composition is a flexible, curable film-forming composition comprising:
• (Ai) a polyether polymer containing a plurality of carbamate groups selected from the group consisting of terminal, pendant, and terminal and pendant of the structure:
• ##STR6## present in the film-forming composition in amounts of about 5 to about 40 percent by weight based on the total weight of resin solids in the clear film-forming composition, where said polyether polymer has on average up to two of said terminal and/or pendant carbamate groups per molecule and has an equivalent weight of from about 140 to about 2500 based on equivalents of said terminal and pendant carbamate groups;
• (Aii) at least one of the polymeric materials selected from the group consisting of:
• (1) polyurethane polyol having a plurality of hydroxyl groups selected from terminal, pendant, and terminal and pendant hydroxyl groups and which optionally has a plurality of carbamate groups of Structure I selected from the group consisting of terminal, pendant, and terminal and pendant carbamate groups;
• and optionally with urethane oligomers having carbamate groups of Structure I selected from the group consisting of pendant, terminal, and pendant and terminal groups;
• (2) at least one polymer of polyester polymer, polyurethane polymer, and acrylic polymer, each of these polymers, when present, contains a plurality of carbamate groups of Structure I selected from their group consisting of terminal carbamate groups, pendant carbamate groups, and terminal and pendant carbamate groups, with urethane oligomers having carbamate groups of Structure I selected from the group consisting of pendant, terminal, and pendant and terminal groups;
• and
• (3) any mixtures thereof from (Aii)(1) and (Aii)(2), and
• wherein when the polyester is present in the clear film-forming composition the polyester is present in amounts up to about 60 percent by weight based on the total weight of resin solids in the clear film-forming composition, and wherein when the acrylic polymer is present in the clear film-forming composition the acrylic is present in amounts up to about 20 percent by weight based on the total weight of resin solids in the clear film-forming composition, and wherein when the polyurethane or polyurethane polyol is present it is present in amounts up to about 55 percent by weight based on the total weight of resin solids in the clear film-forming composition;
• and
• (B) an aminoplast crosslinking agent containing methylol groups, methylol ether groups, or mixtures thereof as a condensate of melamine with formaldehyde and, optionally, an alcohol containing from 1 to 6 carbon atoms and which is present in amounts of about 15 to about 50 percent based on the total weight of resin solids in the clear film-forming composition wherein in flexible, curable film-forming composition for the transparent coat the equivalent ratio of carbamate groups to methylol or methylol ether groups is from about 0.5 to 2:1 and is sufficient to form a crosslinked film.

A flexible, curable film-forming composition comprising:

• (i) a polyether polymer containing a plurality of terminal, pendant or terminal and pendant carbamate groups of the structure:
• ##STR8## present in the film-forming composition in amounts of 5 to 40 percent by weight based on the total weight of resin solids in the film-forming composition;
• (ii) a polymer selected from the group consisting of a polyester polymer, a polyurethane polymer, an acrylic polymer and mixtures thereof wherein each polymer contains a plurality of terminal, pendant or terminal and pendant carbamate groups of Structure I;
• (iii) acrylic polymer containing a plurality of amide groups and optionally a plurality of terminal, pendant, or terminal and pendant carbamate groups of Structure I;
• and
• (iv) an aminoplast crosslinking agent containing methylol groups, methylol ether groups, or mixtures thereof.

A flexible, curable film-forming composition comprising:

• A) polyether polymer containing a plurality of carbamate groups of the structure:
• ##STR9## selected from the group consisting of terminal, pendant, and terminal and pendant present in the film-forming composition in amounts of 5 to 40 percent by weight based on the total weight of resin solids in the film-forming composition;
• (B) polyester polymer derived from a cycloaliphatic acid or anhydride selected from the group consisting of hexahydrophthalic acid, hexahydrophthalic anhydride, methylhexahydrophthalic acid and methylhexahydrophthalic anhydride, wherein the polyester polymer has a plurality of carbamate groups of Structure I selected from the group consisting of terminal carbamate groups, pendant carbamate groups, and terminal and pendant carbamate groups, and
• (C) urethane oligomers having carbamate groups of Structure I selected from the group consisting of pendant, terminal, and pendant and terminal groups;
• and
• (D) an crosslinking agent consisting essentially of aminoplast containing methylol groups, methylol ether groups, or mixtures thereof selected from the group consisting of:
• 1) the reaction product of formaldehyde, acetaldehyde, crotonaldehyde and benzaldehyde with an amine, amide, carbamate, urea or benzoguanamine;
• and 2) aldehyde condensates of glycoluril.