Patent ID: 6984347
Filing Date: 2006-01-10
Classification: B01J,Y10T

Abstract:
1. Thermo-expansive microcapsules comprising a shell of a polymer produced by polymerizing a mixture of monomers, which comprises 40 to 95 weight percent of (I) a nitrile monomer, 7 to 50 weight percent of (II) a monomer having an unsaturated double bond and a carboxyl group in a molecule, 0.01 to 5 weight percent of (III) a monomer having two or more of polymerizable double bonds in a molecule, and optionally, 0 to 15 weight percent of (IV) a monomer different from and copolymerizable with the monomers (I), (II) and (III) and a blowing agent encapsulated in the shell, wherein the mixture of monomers does not substantially contain a monomer having a functional group reactive with the carboxyl group contained in the (II) monomer.