The Nippon Synthetic Chemical Industry Co., Ltd.

Hanako Katou

Shusaku Mandai

Shoya Yoda

Takumi Watanabe

Shouhei Hirase

An object of the present invention is to improve the water dispersibility of the PVA-based resin and also to suppress the swelling of the PVA-based resin. The object is achieved by organic-inorganic composite particles, which have an average particle size of preferably 1 &#x3bc;m to 3,000 &#x3bc;m, including a polyvinyl alcohol-based resin and a component having a three-dimensional siloxane crosslinked structure that is derived from a hydrolysis-polycondensation product of an alkoxysilane and/or a low condensate thereof, wherein the alkoxysilane includes a T unit and/or a Q unit as a structural unit (s), and a Si content with respect to a total weight of the composite particles is 0.1 wt % or more and 23 wt % or less in terms of SiO.

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Tokyo, Japan

Hanako Katou