Phosphorus-containing bisimide resins

Details Phosphorus-containing bisimide resins Phosphorus-containing bisimide resins

1980-08-05

1981-06-30

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428367, 428408, 428902, 428920, 526262, 528228, 528322, B32B 700

Patent

active

042763444

ABSTRACT:
Fire-resistant resins particularly useful for making laminates with inorganic fibers such as graphite fibers, are made by (1) condensation of an ethylenically unsaturated cyclic anhydride with a bis(diaminophenyl)phosphine oxide, and (2) by addition polymerization of the bisimide so obtained. Up to about 50%, on a molar basis, of benzophenonetetracarboxylic acid anhydride can be substituted for some of the cyclic anhydride to alter the properties of the products. Graphite cloth laminates made with these resins have shown 800.degree. C. char yields greater than 70% by weight in nitrogen. Limiting oxygen indexes (LOI) of more than 100% have been determined for these resins, as per ASTM D 2863-4.

REFERENCES:
patent: 2444536 (1948-07-01), Searle

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