Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1984-08-16
1985-08-20
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528168, 528229, 528353, C08G 7310
Patent
active
045365652
ABSTRACT:
Phosphorus-containing polyimides and copolyimides are synthesized in a two-step polycondensation reaction from 1-[(diorganooxyphosphonyl)methyl]-2,4- and -2,6-diaminobenzenes and tetracarboxylic anhydride. The diorgano position of the diorganooxyphosphonyl group includes alkyl, such as ethyl, substituted alkyl, such as 2-chloroethyl, and aryl such as phenyl. The tetracarboxylic anhydrides include compounds such as pyromellitic dianhydride and benzophenone tetracarboxylic dianhydride. The glass transition temperature (Tg) of the polyimides is reduced by incorporation of the (dialkoxyphosphonyl)methyl groups. Both the molecular weight and the thermal stability of the polymers are reduced with increasing concentration of the phosphorus moieties. The phosphorus-containing copolyimides show a considerably higher degree of fire-resistance as compared to that of the corresponding common polyimides, and can be used in matrix composites in very thermally stable high temperature graphite composites for aircraft applications.
REFERENCES:
patent: 3531437 (1970-09-01), Rio
patent: 4082768 (1978-04-01), Renner et al.
patent: 4175174 (1979-11-01), Hermans
Brekke Darrell G.
Lee Lester L.
Manning John R.
Marchant Robert D.
The United States of America as represented by the Administrator
LandOfFree
Fire-resistant phosphorus containing polyimides and copolyimides does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fire-resistant phosphorus containing polyimides and copolyimides, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fire-resistant phosphorus containing polyimides and copolyimides will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-561936