Heat resistant liquid crsytalline polymers

Details Heat resistant liquid crsytalline polymers Heat resistant liquid crsytalline polymers

1993-06-10

1995-03-14

Wu, Shean

Compositions

Liquid crystal compositions

428 1, 524396, 528193, C09K 1952, C09K 1900, C08K 504, C08G 6300

Patent

active

053975022

ABSTRACT:
The heat resistance of polyester liquid crystalline polymers containing repeat units in selected ratios derived from hydroquinone, 4,4'-biphenol, terephthalic acid, 4-hydroxybenzoic acid, and one or both of 4,4'-bibenzoic acid and 2,6-naphthalene dicarboxylic acid is improved by the addition thereto of 15 to 3000 ppm of an alkali metal or 50 to 3000 ppm magnesium or calcium.

REFERENCES:
patent: 4161470 (1979-07-01), Calundann
patent: 4574066 (1986-03-01), Gibbon et al.
patent: 4742149 (1988-05-01), Finestone
patent: 4943606 (1990-07-01), Inoue et al.
patent: 4983688 (1991-01-01), Jennings et al.
patent: 5098940 (1992-03-01), Brooks
patent: 5250654 (1993-10-01), Alms et al.
patent: 5264477 (1993-11-01), Wissbrun et al.

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