Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1980-06-30
1984-12-11
Schain, Howard E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
428458, 524104, 528126, 528128, 528224, 528229, 528351, 528353, C08G 6932, C08G 7310, C08G 7312, C08G 7314
Patent
active
044879113
ABSTRACT:
A stable solution of an aromatic polyamic acid of controlled molecular weight, of the type capable of being converted to polyimides, which undergoes relatively little change in viscosity or gelling over extended periods of time at room temperature. Such solution may be prepared by reacting impure aromatic dianhydride with aromatic diamine in a suitable solvent where the ratio of active aromatic diamines is approximately equimolar. Such solution may also be prepared by a two step process which comprises:
REFERENCES:
patent: 3179614 (1965-04-01), Edwards
patent: 3179631 (1965-04-01), Endrey
patent: 3179632 (1965-04-01), Hendrik
patent: 3179633 (1965-04-01), Endrey
patent: 3179634 (1965-04-01), Edwards
patent: 3629180 (1971-12-01), Yoda et al.
patent: 3652500 (1972-03-01), Peterson
patent: 3663492 (1972-05-01), Behr
patent: 3663510 (1972-05-01), Peterson
patent: 3770686 (1973-11-01), Torelli
patent: 3891601 (1975-06-01), Peterson et al.
Lange Daniel J.
Marquardt Daniel J.
Glass Hyman F.
Ring Sidney B.
Schain Howard E.
The P. D. George Company
Zitven Leon
LandOfFree
Stable polyamic acids does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stable polyamic acids, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stable polyamic acids will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1464072