Sheetlike wholly aromatic polyamide shaped article and a method

Details Sheetlike wholly aromatic polyamide shaped article and a method Sheetlike wholly aromatic polyamide shaped article and a method

1993-12-21

1995-02-28

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528331, 528332, 528335, 428265, 428266, 428267, 428391, 428395, 4284111, 4284744, 26433116, 26433119, 1621573, 1621644, C08G 7310, B32B 2728, B32B 2734

Patent

active

053938720

ABSTRACT:
This invention relates to a sheetlike wholly aromatic polyamide shaped article useful as electrical insulating materials excellent in corona resistance (corona durability) and in surface smoothness. The corona durability of said sheetlike shaped article is increased to 150 minutes or above by adding a nonionic polymer flocculant to an aqueous dispersion comprising 10 to 90% by weight of mica particles, preferably treated with a silane coupling agent and 90 to 10% by weight of a wholly aromatic polyamide stock (fibrids and fibers) in obtaining the sheetlike shaped article from the aqueous dispersion by wet shaping.

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