Cellular intumescent materials

Details Cellular intumescent materials Cellular intumescent materials

1980-04-24

1982-04-13

Van Balen, William J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

428921, 4283055, 4283084, B32B 302, B32B 520, B32B 702

Patent

active

043248357

ABSTRACT:
A cellular intumescent material comprising a substantially open-called substrate impregnated with a flexible intumescent polymer. The open-celled nature of the substrate is retained. The substrate may be a latex or urethane-based foam, a natural rubber or a synthetic rubber. The impregnant comprises at least a binder (A) and an intumescent component (B).
The binder (A) can be a polyester, a liquid polymer system, a resin, a latex or an elastomer solution.
The intumescent component (B) consists of a carbonific element (e.g. starch, sugar, sorbitol or pentaerythritol, or a compound which can polymerize to a "ladder" structure) and a spumific element (e.g. an inorganic acid or a precursor therefor).
On exposure to a flame the materials flame initially but form a protective char and subsequently extinguish. The char prevents further burning of the treated material.

REFERENCES:
patent: 3312565 (1967-04-01), Rayner et al.
patent: 3320087 (1967-05-01), Erickson
patent: 3663463 (1972-05-01), Wren
patent: 3843526 (1974-10-01), Roth et al.
patent: 3914513 (1975-10-01), Brown et al.
patent: 3934066 (1976-01-01), Murch
patent: 4224374 (1980-09-01), Priest

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