THERMALLY EXPANDABLE MICROCAPSULE METHOD FOR PRODUCING THERMALLY EXPANDABLE MICROCAPSULE FOAMABLE MASTERBATCH AND FOAM MOLDED ARTICLE

摘要

An object of the present invention is to provide heat-expandable microcapsules which are excellent in heat resistance and durability and exhibit excellent foamability in a wide temperature range from a low temperature to a high temperature.The present invention relates to a heat-expandable microcapsule containing a volatile liquid as a core agent in a shell containing a copolymer, wherein the copolymer is a monomer having at least one monomer selected from the group consisting of a nitrile group-containing acrylic monomer and an amide group-A and a monomer B containing at least one monomer B selected from the group consisting of a carboxyl group-containing acrylic monomer and an ester group-containing acrylic monomer, wherein the total content of the monomer A and the monomer B is not less than the monomer mixture Wherein the weight ratio of the monomer A to the monomer B is 5: 5 to 9: 1.