Patent ID: 8921456

Claim:
An intumescent coating composition, comprising: a thermoplastic polymer which comprises as a copolymerized component, an acid (meth)acrylate or a copolymerizable polyfunctional carboxylic acid such that at least one acid carboxylate group is pendant to the carbon-carbon chain of the thermoplastic polymer; at least one ethylenically unsaturated monomer; an azo or organic peroxide initiator; an acid source; a carbon source; and a gas source; wherein the thermoplastic polymer is a (meth)acrylate polymer or a polymer of at least one vinyl monomer selected from the group consisting of styrene, vinyltoluene, vinyl chloride, vinyl acetate, vinylidene chloride and a vinyl ester, and wherein the polymer of the vinyl monomer optionally comprises a diene component.