Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1988-09-06
1996-06-25
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
525421, 525436, 528 26, 528 27, 528 28, 528 38, 528 41, 528125, 528128, 528170, 528183, 528211, 528220, 528226, 528229, 528322, 528351, 528352, 528353, C08G 7310
Patent
active
055300898
ABSTRACT:
Polysulfoneimide oligomers having crosslinking end cap moleties which provide improved solvent-resistance to cured composites are generally represented by backbones of the formula: ##STR1## wherein ##STR2## n=1 or 2; R and R' are divalent aromatic organic radicals having from 2-20 carbon atoms; ##STR3## E=allyl or methallyl; R=a trivalent C.sub.(6-13) aromatic organic radical;
R.sub.1 =any of lower alkyl, lower alkoxy, aryl, or substituted aryl;
R'=a divalent C.sub.(6-30) aromatic organic radical;
j=0, 1, or 2; and
G=--CH.sub.2 --, --O--, --S--, or --SO.sub.2 --
The crosslinkable oligomers are made by reacting substituted phthalic anhydrides with hydroxyaryl amines and suitable crosslinking end cap reactants, or by self-condensation of phthalimide salts followed by capping the polymers. Related polyetherimides of the present invention can be prepared by the condensation of nitrophthalic anhydride, diamines, dialcohols (dihydricphenols), and phenolic, crosslinking end caps (A-OH), or the condensation of bis(phenates) or dialcohols (hisphenols), diamines, nitrophthalic anhydride, and amine-terminated end caps (A-NH.sub.2) or nitro-terminated end caps (A-NO.sub.2).
REFERENCES:
patent: 4075171 (1978-02-01), D'Alelio
patent: 4107147 (1978-08-01), Williams et al.
patent: 4418181 (1983-11-01), Monacelli
patent: 4536559 (1985-08-01), Lubowitz et al.
patent: 4684714 (1987-08-01), Lubowitz et al.
Lubowitz Hyman R.
Sheppard Clyde H.
Anderson Harold D.
Hammar John C.
The Boeing Company
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