Somar Corporation

Mikio Osa

Kazuya Ono

Katsuji Kitagawa

Masao Kubo

Seitaro Iwamoto

Takeshi Watanabe

Kunimitsu Matsuzaki

Tetsuo Miyake

Katuji Kitagawa

A powder coating composition useful for fixation of rotor and stator windings is disclosed, which includes

Powder epoxy resin coating composition

A powder coating composition includes one or more crystalline substances the lowest melting point of which is Mp and one or more non-crystalline substances the lowest glass transition point of which is Tg and is lower than Mp, wherein the crystalline and non-crystalline substances are selected from epoxy resins and curing agents and bonded to each other. The bonding is effected by maintaining a powdery mixture containing the crystalline and non-crystalline substances at a temperature higher than Tg but lower than Mp and the softening point of any of the the non-crystalline substances, optionally under a pressure, and cooling and pulverizing the resulting mixture.

Powder coating composition comprising conventional epoxides with

A powder coating composition in which epoxy resin particles and curing agent particles are uniformly distributed is prepared by heating a specific powdery blend of (a) at least one crystalline epoxy resin, (b) at least one crystalline curing agent and (c) at least one non-crystalline epoxy resin and/or at least one non-crystalline curing agent at a specific temperature so that the crystalline particles are bonded with each other with the non-crystalline substance serving as a binder.

Process for preparing powder coating composition

A composite material having a substrate and an expanded, cured layer of an epoxy resin composition which is provided over a surface of the substrate and in which a major portion of the cells are present in a location adjacent to the interface between the substrate and the expanded layer and substantially no cells are present on the top surface portion of the expanded layer. The epoxy resin composition includes an acid anhydride curing agent and an alkali metal carbonate blowing agent. The composition is coated over the substrate and the coating is heated to sure and expand the composition while maintaining the top surface of the coating below the expansion temperature.

Growing community of inventors

Saitama, Japan

Mikio Osa