Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1999-01-14
2000-08-15
Hampton-Hightower, P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528126, 528128, 528172, 528173, 528174, 528179, 528183, 528188, 528220, 528229, 528288, 528350, 528352, 528125, 428357, 428394, 428395, 428396, 26433119, 26433121, C08G 7310, C08G 6926
Patent
active
061038644
ABSTRACT:
The polyimides are derived from solutions of at least one low-boiling organic solvent, e.g. isopropanol containing a mixture of polyimide-forming monomers. The monomeric solutions have an extended shelf life at ambient (room) temperatures as high as 80.degree. C. and consist essentially of a mixture of monoalkyl ester-acids, alkyl diester-diacids and aromatic polyamines wherein the alkyl radicals of the ester-acids are derived from lower molecular weight aliphatic secondary alcohols having 3 to 5 carbon atoms per molecule such as isopropanol, secondary butanol, 2-methyl-3-butanol, 2 pentanol or 3-pentanol. The solutions of the polyimide-forming monomers have a substantially improved shelf-life and are particularly useful in the aerospace and aeronautical industry for the preparation of polyimide reinforced fiber composites such as the polyimide cured carbon composites used in jet engines, missiles, and for other high temperature applications.
REFERENCES:
patent: 3697345 (1972-10-01), Lubowitz
patent: 3708459 (1973-01-01), Lubowitz
patent: 3745149 (1973-07-01), Serafini et al.
patent: 5041526 (1991-08-01), Riel et al.
patent: 5041527 (1991-08-01), Riel et al.
patent: 5041528 (1991-08-01), Riel et al.
patent: 5091505 (1992-02-01), Serafini et al.
patent: 5171822 (1992-12-01), Pater
patent: 5175241 (1992-12-01), Darrow
patent: 5338827 (1994-08-01), Serafini et al.
patent: 5770676 (1998-06-01), Pater et al.
Alston William B.
Gahn Gloria S.
Hampton-Hightower P.
Stone Kent N.
The United States of America as represented by the Administrator
LandOfFree
Composition and process for retarding the premature aging of PMR does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Composition and process for retarding the premature aging of PMR, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Composition and process for retarding the premature aging of PMR will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2008089