Patent ID: 8906461

Claim:
A lacquer coating composition comprising an ABA′-block copolymer and a volatile organic liquid carrier, wherein the block copolymer has a weight average molecular weight of about 5,000 to 200,000 and contains a polymeric A block, a polymeric B block, and a polymeric A′ block: wherein (a) the polymeric A block is of polymerized ethylenically unsaturated monomer(s) comprising one or more monomers having one or more interactive functional groups; (b) the polymeric B block is of a polymerized ethylenically unsaturated monomer(s); and (c) the polymeric A′ block is of polymerized ethylenically unsaturated monomer(s) comprising one or more monomers having one or more interactive functional groups; and further wherein the A and A′ blocks have the same or similar composition and the B block has a different composition from the A and A′ blocks; the A and A′ blocks differ from the B block by the presence of one or more of said interactive functional groups from said one or more monomers that are capable of interacting with each other for the formation of a reversible network and the B-block is a non-functional block and essentially free of said interactive functional groups; and the volatile organic liquid carrier consists of a solvent or solvent blends selected from the group consisting of aromatic hydrocarbons, esters, glycol ether esters, methyl n-amyl ketone, methyl isobutyl ketone, methyl ethyl ketone, and a combination thereof; wherein the A block contains at least three different interactive functional groups selected from the group consisting of carboxylic acid, hydroxyl, urea, amide, ethylene oxide groups, and any mixtures thereof, with the proviso that at least one of the at least three different interactive functional groups is urea or amide, or any mixture thereof; wherein the A′ block contains at least two different interactive functional groups selected from the group consisting of carboxylic acid, hydroxyl, ethylene oxide groups, and any mixtures thereof; each of said A, B and A′ block contains at least 70 mole percent of a methacrylate monomer or methacrylate monomer mixtures, and said lacquer coating composition comprises 0% to 5% of water.