Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1999-06-29
2000-10-17
Hampton-Hightower, P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528125, 528128, 528172, 528173, 528179, 528183, 528185, 528188, 528220, 528229, 528350, 528353, 525935, 524600, 524602, 524608, 4284111, 428425, 4284735, C08G 7310
Patent
active
061334014
ABSTRACT:
Polyimide copolymers were obtained containing 1,3-bis(3-aminophenoxy)benzene (APB) and other diamines and dianhydrides and terminating with the appropriate amount of reactive endcapper. The reactive endcappers studied include but should not be limited to 4-phenylethynyl phthalic anhydride (PEPA), 3-aminophenoxy-4'-phenylethynylbenzophenone (3-APEB), maleic anhydride (MA) and nadic anhydride (5-norbornene-2,3-dicarboxylic anhydride, NA). Homopolymers containing only other diamines and dianhydrides which are not processable under conditions described previously can be made processable by incorporating various amounts of APB, depending on the chemical structures of the diamines and dianhydrides used. By simply changing the ratio of APB to the other diamine in the polyimide backbone, a material with a unique combination of solubility, Tg, Tm, melt viscosity, toughness and elevated temperature mechanical properties can be prepared. The copolymers that result from using APB to enhance processability have a unique combination of properties that include low pressure processing (200 psi and below), long term melt stability (several hours at 300.degree. C. for the phenylethynyl terminated polymers), high toughness, improved solvent resistance, improved adhesive properties, and improved composite mechanical properties. These copolyimides are eminently suitable as adhesives, composite matrices, moldings, films and coatings.
REFERENCES:
patent: 5567800 (1996-10-01), Hergenrother et al.
patent: 5644022 (1997-07-01), Jensen
patent: 5866676 (1999-02-01), Jensen
Hampton-Hightower P.
Hawkins Hillary W.
The United States of America as represented by the Administrator
LandOfFree
Method to prepare processable polyimides with reactive endgroups does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method to prepare processable polyimides with reactive endgroups, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method to prepare processable polyimides with reactive endgroups will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-470127