Coating processes – Mold coating
Patent
1994-06-13
1995-11-28
Beck, Shrive
Coating processes
Mold coating
427307, 4274071, 4284242, B05D 310, B05D 136, B32B 2740
Patent
active
054706084
ABSTRACT:
A surface coating agent to be coated on the surface of an elastic molding die, which is a solvent solution of a polyurethane obtained by reacting a polyol with an aromatic polyisocyanate. The surface coating agent can be coated on the inside surface of the elastic molding die to form a coating layer, thereby obtaining a molding with surface gloss. Further, the surface coating agent can be incorporated with silicone and/or a fluorine compound to improve oil resistance of the elastic molding die, preventing the elastic molding die from being swollen by oil components of a molding material and improving durability. When a polyether type polyol is used as the polyol, water resistance of the elastic molding die can be even further improved. The surface coating agent using polycarbonatepolyol as the polyol has improved adhesion to the elastic molding die, thereby improving the durability. Further, the surface coating layer can be even more securely bonded to the surface of the elastic molding die by coating the surface coating agent after primer coating, or after acid treatment, or after acid treatment and primer coating.
REFERENCES:
patent: Re33290 (1990-08-01), Naka et al.
patent: 3837969 (1974-09-01), Mezynski
patent: 4024317 (1977-05-01), Stoye et al.
patent: 5004627 (1991-04-01), Presswood et al.
patent: 5332190 (1994-07-01), Watanabe et al.
Database WPI Section Ch, Week 9121, Derwent Publications, Ltd., London, GB, Abstract of JP-A-03-087205 (Apr. 12, 1991).
Horiguchi Itaru
Ikeda Kenji
Iwasaki Yujiro
Kohno Hiroshige
Sato Atsushi
Asahi Denka Kogyo Kabushikikaisya
Beck Shrive
Okamoto Industries Inc.
Parker Fred J.
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