Polyimides for mold release

Details Polyimides for mold release Polyimides for mold release

1989-10-10

1991-04-02

Lusignan, Michael

Coating processes

Mold coating

427135, 427379, 4273855, 4284735, 528125, 528128, 528176, 528353, B05D 302

Patent

active

050046276

ABSTRACT:
A method of treating the surface of a mold to improve its release characteristics is disclosed. A coating of a polyamic acid solution comprising the reaction product of 2,2-bis[4-(aminophenoxy)phenyl]hexafluoropropane and an aromatic tetracarboxylic acid or dianhydride or ester derivative thereof is applied to the mold surface. The coating is cured at elevated temperatures to remove the solvent and form the corresponding polyimide.

REFERENCES:
patent: 3188226 (1965-06-01), Jense
patent: 4293684 (1981-10-01), Takekoshi
patent: 4603061 (1986-07-01), St. Clair et al.
patent: 4816516 (1989-03-01), Yamaya et al.
patent: 4831977 (1989-05-01), Presswood
patent: 4879182 (1989-11-01), Presswood et al.

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