Asahi Glass Company, Limited

Agc Inc.

Noriharu Tate

Jun Hoshikawa

Masumi Nomura

Hitoshi Susa

To provide a powder primer composition excellent in adhesion properties and a laminate obtained by using it. The power primer composition comprises a powder made of a reactive ethylene/tetrafluoroethylene copolymer containing repeating units (A) based on tetrafluoroethylene, repeating units (B) based on ethylene, and repeating units (C) based on a monomer having an acid anhydride residue and a polymerizable unsaturated bond, wherein (C)/((A)+(B)) is from 1/10,000 to 5/100 by molar ratio; and a powder made of an epoxy resin having an epoxy equivalent of from 500 to 2,700 and a softening point of at least 70&#xb0; C.; wherein the mass ratio of the powder made of a reactive ethylene/tetrafluoroethylene copolymer to the powder made of an epoxy resin is from 99/1 to 80/20.

Powder primer composition and laminate using it

A process for producing filler-containing polytetrafluoroethylene granules by an underwater agitation granulation method, whereby filler-containing polytetrafluoroethylene granules excellent in flowability can be obtained with little detachment of the filler and it is possible to prevent discharge of a polytetrafluoroethylene emulsion into waste liquid, the process characterized in that in a stage of granulating a mixture of polytetrafluoroethylene powder and a filler by agitation in water in the presence of a liquid organic substance hardly soluble in water, a polytetrafluoroethylene emulsion and a coagulant are added to coagulate the polytetrafluoroethylene emulsion as a surface layer of the filler-containing polytetrafluoroethylene granules.

Growing community of inventors

Chiyoda-ku, Japan

Noriharu Tate