Patent ID: 9504980
Filing Date: 2016-11-29
CPC Classification: B01J,C08F,C08J

Claim Text:
1. A thermally expandable microcapsule comprising a volatile expansion agent included in a shell as a core agent and the shell formed of a polymer, wherein the shell contains a thermosetting resin and a polymer obtained by polymerization of a monomer composition containing a nitrile-type monomer and a monomer having a carboxyl group, the thermosetting resin has no radical-polymerizable double bond and at least two functional groups reactive with a carboxyl group per molecule, an amount of the thermosetting resin is 0.01 to 30% by weight relative to entire polymers constituting the shell, an amount of the monomer having a carboxyl group is 1 to 50 parts by weight relative to 100 parts by weight of the monomer composition, and the thermosetting resin has a gel fraction of less than 5% at T1.0 and a gel fraction of not less than 5% at T1.5, wherein T1.0 indicates a temperature when the core agent shows a vapor pressure of 1.0 MPa and T1.5 indicates a temperature when the core agent shows a vapor pressure of 1.5 MPa.