Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1988-04-20
1993-11-09
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528125, 528126, 528128, 528172, 528322, 528350, 528351, 528352, 528375, 528376, 528387, 525348, 525422, C08G 6926, C08G 7500, C08G 7514
Patent
active
052604110
ABSTRACT:
A method for the preparation of a polyimide containing reversible crosslinks comprising the step of curing a monomer having the formula ##STR1## wherein R and R' may be the same or different and each is H or lower alkyl having 1-5 carbon atoms under conditions conducive to the formation of a polyimide and thereby forming a polyimide having the formula ##STR2## R and R' are as defined above and n is an integer from 10 to 100. The polyimide may be converted to a soluble polymer by cleaving the disulfide bond in the presence of a solvent and a reducing agent. The reduced polymer may be reformed into the polymer in an oxidation step or into a modified polyimide in other reaction steps. Copolymerization processes are also disclosed.
REFERENCES:
patent: 2444536 (1948-07-01), Searle
patent: 2466963 (1949-04-01), Patrick et al.
patent: 3051695 (1962-08-01), Warner et al.
patent: 3297713 (1967-01-01), Ladd
patent: 3766138 (1973-10-01), Crivello
patent: 4323662 (1982-04-01), Oba et al.
patent: 4413107 (1983-11-01), Locatelli
patent: 4680378 (1987-07-01), Hefner, Jr.
patent: 4754016 (1988-06-01), Ai et al.
patent: 4882399 (1989-11-01), Tesoro et al.
CA 110:213999; "Recoverable Polyimide Resins", Sastri, et al.
King, Modern Plastics Encyclopedia, p. 18, 1986-1987.
Sastri Vinod R.
Tesoro Giuliana C.
Hampton-Hightower P.
Kight III John
Polytechnic University
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