Nippon Mektron Limited

Tetsuya Mizuno

Takehiro Sonoi

Okimasa Yamada

Toshimasa Sagawa

Koichi Takahashi

Hanghua Pan

Masato Sato

A copolymer, which comprises about 30 to about 70% by weight of perfluoroalkylethyl (meth)acrylate represented by the following general formula:

Copolymer and water- and oil-repellent agent containing the same

Hexafluoroacetone or its hydrate is produced in a higher yield than that of the conventional process (1) by oxidizing a heptafluoroisobutenyl ether with ozone or (2) by thermally decomposing an octafluoroisobutyl ether or a heptafluoroisobutenyl ether in the presence of oxygen and an activated carbon catalyst.

Process for producing hexafluoroacetone or its hydrate

Hexafluoracetone or its hydrate is produced in a higher yield than that of the conventional process (1) by oxidizing a heptafluoroisobutenyl ether with ozone or (2) by thermally decomposing an octafluoroisobutyl ether or a heptafluoroisobutenyl ether in the presence of oxygen and an activated carbon catalyst.

A fluorine-containing elastomer composition which comprises (a) a fluorine-containing elastomer, (b) at least one of divalent metal oxide and hydroxide, (c) a polyhydroxyaromatic compound and (d) a complex compound of 1,8-diazobicyclo[5,4,0]undec-7-ene or diazabicyclo[4,3,0]non-5-ene and a divalent metal chloride, has a good stock storage stability and can produce a vulcanized product with improved vulcanized product properties and compression set.

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Kitaibaraki, Japan

Tetsuya Mizuno