Polymerizing bis-maleimides

Details Polymerizing bis-maleimides Polymerizing bis-maleimides

1974-08-14

1978-10-03

Lee, Lester L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526258, 526270, 526 89, 526234, 526256, 526262, C08G 7312

Patent

active

041183770

ABSTRACT:
Processes for increasing the molecular weight of bis-maleimides are provided. The bis-maleimides are reacted with certain cyclic dienes to form reversible adducts. These adducts, upon elimination of the cyclic diene, yield an extension of the bis-maleimides to higher molecular weight polymers, ultimately to thermally stable, infusible polymers. The process can be interrupted to yield tractable polymers which are also convertible to cross-linked, infusible products. Modifications of the process include preparing the adducts in the presence of aprotic solvents as well as Bronsted acid salt catalysts, and the isolation of intermediate solid products.

REFERENCES:
patent: 3576691 (1971-04-01), Meyers
patent: 3671490 (1972-06-01), Bargain
patent: 3708459 (1973-01-01), Lubowitz
patent: 3748310 (1973-07-01), Burns et al.
patent: 3748311 (1973-07-01), Burns et al.
patent: 3748312 (1973-07-01), Burns et al.
patent: 3803081 (1974-04-01), Lubowitz
Lubowitz, New Polyimides Polymers and Composites Conference on High Temperature Polymers, Reinforcements and Composites, University of Utah, Jun. 8 to 13, 1970.

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