Flame-resistant polymethacrylimide foams

Details Flame-resistant polymethacrylimide foams Flame-resistant polymethacrylimide foams

1997-02-24

1997-12-16

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521135, 521149, 521183, C08J 900

Patent

active

056986050

ABSTRACT:
A composition includes a polymethacrylimide polymer which is polymerized in the presence of an epoxy resin and a flame-inhibiting agent. Further, a process is described for making flame-resistant polymethacrylimide, which includes mixing an epoxy resin and a flame-inhibiting agent with a methacrylic acid and methacrylonitrile, and polymerizing. A polymethacrylimide foam so prepared has an LOI value of at least 25 and retains the good mechanical properties that are associated with polymethacrylimide foams.

REFERENCES:
patent: 3627711 (1971-12-01), Schroeder et al.
patent: 3888945 (1975-06-01), Arndt et al.
patent: 4576971 (1986-03-01), Baumgartner et al.
patent: 4885317 (1989-12-01), Thein et al.
patent: 5225449 (1993-07-01), Tada et al.

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