Sumitomo Seika Chemicals Co., Ltd.

Hirofumi Fujita

Norihiro Sugihara

Jun Sakata

Yuhei Funabiki

Toshiaki Fujiwara

An aqueous dispersion of polyamide rubber elastic body, which contains an aqueous medium and a polyamide rubber elastic body emulsified and dispersed in the aqueous medium in the presence of a surfactant. The surfactant is used in an amount of 1 to 20 parts by weight based on 100 parts by weight of the polyamide rubber elastic body, and is for example at least one member selected from the group consisting of a polyoxyalkylene alkyl ether sulfate, a dialkyl sulfosuccinate, a fatty acid salt and an ethylene oxide/propylene oxide copolymer. This aqueous dispersion can produce a molded article having the characteristics of the polyamide rubber elastic body, particularly a molded article which hardly suffers from bleeding of the surfactant and is excellent in transparency.

Aqueous dispersion of polyamide rubber elastic body and method of producing the same

The present invention provides a polyolefin-based composite resin spherical particle that gives a coating film having a matte appearance, a soft feeling, and excellent scratch resistance by being used for a coating material. The present invention also provides a coating composition containing the polyolefin-based composite resin spherical particle and a coating resin, and a coated article obtained by applying the coating composition to a substrate. The invention relates to a polyolefin-based composite resin spherical particle, which is a spherical particle obtained by mixing 100 parts by mass of a polyolefin-based resin, 40 to 1,500 parts by mass of water, and 3 to 30 parts by mass of an ethylene oxide/propylene oxide copolymer having a weight average molecular weight of 4,000 to 30,000 to prepare a mixture, emulsifying the mixture at a temperature of the highest melting point of the polyolefin-based resin or higher, and cooling the mixture from a temperature at least 25&#xb0; C. higher than the highest crystallization temperature of the polyolefin-based resin to a temperature at least 25&#xb0; C. lower than the lowest crystallization temperature of the polyolefin-based resin at a cooling speed of 0.2&#xb0; C./min or more, wherein the polyolefin-based resin is a composite resin containing 5 to 70% by mass of a partially saponified ethylene/vinyl acetate copolymer.

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Himeji, Japan

Hirofumi Fujita