Agc Inc.

Yukiko Yoshimoto

Hiroyuki Hara

Sho Masuda

Yuuichi Oomori

To provide a water/oil repellent composition whereby it is possible to obtain an article which is excellent in each of water-repellency, oil-repellency, washing durability, heavy rain durability and texture, a method for producing said composition, and an article which is excellent in each of water-repellency, oil-repellency, washing durability, heavy rain durability and texture. The water/oil repellent composition comprises a copolymer having units based on a monomer (a), units based on a monomer (b) and units based on a monomer (c), and a liquid medium. Monomer (a): a compound represented by (Z&#x2014;Y)X (Z: a Cperfluoroalkyl group, etc.; Y: a divalent organic group, etc.; n: 1 or 2; X: a polymerizable unsaturated group). Monomer (b): a (meth)acrylate having no polyfluoroalkyl group and having an alkyl group with at least 20 carbon atoms. Monomer (c): a compound represented by CH&#x2550;CRC(O)O&#x2014;[(CHO)(CHO)]&#x2014;H (R: a hydrogen atom or a methyl group, and a/b=1 to 3).

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Chiyoda-ku, Japan

Yukiko Yoshimoto