Process for forming a fire retardant intumescent material having

Details Process for forming a fire retardant intumescent material having Process for forming a fire retardant intumescent material having

1992-01-27

1992-08-11

Lovering, Richard D.

Compositions

Fire retarding

Intumescent

252609, 4283215, 42840221, 428920, 4284022, C09K 2100

Patent

active

051376580

ABSTRACT:
An intumescent material and a process for forming of an intumescent material is disclosed including a two stage intumescent expansion characteristic. The composition includes an intumescent material having a primary expansion ingredient such as expanding graphite in combination with a pre-expansion material adapted to provide intumescent expansion at a temperature less than that of the primary expansion material. The pre-expansion material preferably is a liquid isobutane encapsulated within microspheres of any latex material or polyvinylidene. The pre-expansion step allows for a low density mass having fairly uniform dimensions relative to the original proportions of the specimen. A novel process for forming same allows heating to a temperature greater than the pre-expansion temperature within a closed mold to prevent pre-expansion by containment therein and still allow heat fusing of the fire barrier form.

REFERENCES:
patent: 4444825 (1984-04-01), Vanderstukken et al.
patent: 4599369 (1986-07-01), Malcom-Brown
patent: 4636538 (1987-01-01), Malcom-Brown
patent: 4663226 (1987-05-01), Vajs et al.
patent: 4743625 (1988-05-01), Vajus et al.
patent: 4857364 (1989-04-01), von Bonin et al.
patent: 4992481 (1991-02-01), von Bonin et al.

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