Sumitomo Seika Chemicals Co., Ltd.

Advanced Softmaterials Inc.

Yusaku Masuhara

Naoyuki Hashimoto

Katsumasa Yamamoto

Seiji Bando

Seiya Ashibe

Hidehiko Myoken

Naoki Sainou

Provided is a novel production method capable of easily producing a methylene disulfonate compound. The method for producing a methylene disulfonate compound comprises reacting a specific sulfonic acid compound with a formaldehyde compound in the presence of sulfur trioxide.

Method for producing methylene disulfonate compound

The present invention aims to provide a polyrotaxane-containing composition having excellent transparency. The present invention relates to a polyrotaxane-containing composition including: a polyrotaxane that has a cyclic molecule, a linear molecule threading through a cavity of the cyclic molecule in a skewered manner, and capping groups capping both ends of the linear molecule; and an alkyl (meth) acrylate that has a C4-C18 alkyl group, the polyrotaxane having at least one cyclic molecule that has a C4-C18 alkyl group.

Polyrotaxane-containing composition

The present invention aims to provide a composition for soft materials, which enables production of a soft material excellent in transparency, a stress relaxation property, and strength and having an elongation property that is not so much lowered even at high temperatures. The present invention also aims to provide a soft material produced using the composition for soft materials of the present invention. The present invention relates to a composition for soft materials including polyrotaxane and a radical polymerizable monomer, the polyrotaxane including a cyclic molecule, a linear molecule threading through a cavity of the cyclic molecule in a skewered manner, and capping groups that cap both ends of the linear molecule, the polyrotaxane having at least one cyclic molecule with a radical polymerizable group, the polyrotaxane having at least two radical polymerizable groups.

Composition for soft materials, and soft material

An ultraviolet absorbent substance includes a metal complex and a matrix, formed with at least one matrix material and/or polymerizable monomer as a precursor of a matrix material and containing said metal complex therein. One exemplary function of the ultraviolet absorbent substance is allowing visible light rays transmitted through satisfactorily while selectively blocking ultraviolet rays.

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Hyogo, Japan

Yusaku Masuhara