THERMALLY FOAMABLE MICROSPHERE, METHOD OF PRODUCING THE SAME, AND USE THEREOF

摘要

This invention aims to provide a thermally foamable microsphere which is excellent in heat resistance, has a high expansion ratio, and shows stable foaming behavior; a method of producing the thermally foamable microsphere; and suitable use thereof.;This invention provides a thermally foamable microsphere in which an outer shell encapsulating a foaming agent is formed of a copolymer having a polymethacrylimide structure. In particular, this invention provides a thermally foamable microsphere in which monomers capable of forming the polymethacrylimide structure by a copolymerization reaction are methacrylonitrile and methacrylic acid. Moreover, this invention provides a method of producing the thermally foamable microsphere and use of the thermally foamable microsphere as an additive.

主权项

1. A thermally foamable microsphere, comprising:
a foaming agent; and an outer shell encapsulating the foaming agent and capable of being formed by a copolymer having a polymethacrylimide structure from a mixture of polymerizable monomers; wherein the mixture of the polymerizable monomers comprises a substance comprising methacrylonitrile and methacrylic acid in a total weight of 90 to 100% by weight, in which a molar ratio of methacrylonitrile to methacrylic acid is 1:9 to 9:1.