Coating processes – Removable protective coating applied
Patent
1994-11-14
1996-03-05
Silbaugh, Jan H.
Coating processes
Removable protective coating applied
134 1, 134 26, 134 29, 430294, 430329, B05D 100, B08B 304
Patent
active
054965845
ABSTRACT:
A method for removing a liquid crystal alignment film from a liquid crystal cell substrate having the alignment film formed by coating a solution containing, as the main component, a polyamic acid having, as the main repeating units, a chemical structure of the following formula (1): ##STR1## wherein each of R.sub.1 and R.sub.2 is a hydrogen atom or a methyl group, R.sub.3 is a bivalent organic group constituting a diamine, and n is from 10 to 1,000, followed by baking, which method comprises irradiating said liquid crystal cell substrate with ultraviolet rays having wavelengths within a range of from 230 to 300 nm and then treating it with an aprotic highly polar organic solvent or an alkaline solvent.
REFERENCES:
patent: 4358579 (1982-11-01), Nimry et al.
patent: 4877718 (1989-10-01), Moore et al.
patent: 4886734 (1989-12-01), Moore et al.
patent: 5053480 (1991-10-01), Koto et al.
Harunari Takashi
Konno Akihiro
Okamura Toshiyasu
Yanagimoto Akira
Chaudhry Saeed
Nissan Chemical Industries Ltd.
Silbaugh Jan H.
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