Fire-resistant composition

Claim 2

A composition which is initially plastic and sticky and at least when hardened resistant to fire, comprising: a binder comprising a flexible film-forming adhesive polymer in a non-flammable volatile solvent, the binder having dispersed therein aluminum trihydrate as a fire retardant and an exfoliatable mineral.

Claim 3

A composition according to claim 1, wherein the binder also has dispersed therein a thioxotropic agent.

Claim 4

A composition according to claim 1, wherein the adhesive polymer is polyvinyl butyral.

Claim 5

A composition according to claim 1, wherein the volatile solvent is trichloroethane.

Claim 6

A composition according to claim 2, wherein the thioxotropic agent is precipitated silica.

Claim 7

A composition according to claim 1, wherein the exfoliatable mineral is vermiculite.

Claim 8

A composition according to claim 1, wherein the binder comprises, dispersed therein a carbonific.

Claim 9

A composition according to claim 1, wherein the binder contains dispersed therein a formaldehyde resin.

Claim 10

A composition according to claim 8, wherein the binder contains dispersed therein a cross-linking agent for the resin.

Claim 11

A composition according to claim 8, wherein the binder contains dispersed therein an activator which promotes the decomposition of the resin.

Claim 12

A composition according to claim 1, wherein the binder contains dispersed therein a water-hardenable setting agent.

Claim 13

A composition according to claim 1, wherein the binder contains dispersed therein a potassium, sodium aluminosilicate.

Claim 14

A composition according to claim 1, wherein the binder includes castor oil.

Claim 15

A composition according to claim 1, including at least one inorganic filler.

Claim 16

A composition according to claim 1, comprising dispersed in the binder expandable graphite as a filler.

Claim 17

A composition according to claim 1, formulated to be of the consistency of a conventional mastic and to be extrudable from a conventional mastic extrusion gun.

Claim 18

A composition according to claim 1, comprising the following ingredients in the stated proportions by weight based on a total of 100 parts by weight of said ingredients: ______________________________________ Ingredient Proportions ______________________________________ Monoammonium phosphate 8-20 Dicyandiamide 3-12 Melamine formaldehyde 7-16 resin (uncured) Plaster of Paris 2-6 Pentaerythritol 1.5-4 K, Na alumino-silicate 3-8 Vermiculite (exfoliating) 4-12 Aluminium trihydrate 4-12 Polyvinyl butyral 3-8 Trichloroethane 20-40 Castor oil 1.5-4 Precipitated silica 0.5-2 ______________________________________

Claim 19

A composition according to claim 1, when hardened by exposure to air.

Claim 20

A plastic composition for use as a sealant and which at least when hardened is resistant to fire, comprising polyvinyl butyral as a flexible film-forming adhesive polymer, a volatile non-flammable solvent, aluminum trihydrate as a fire retardant, exfoliatable vermiculite to act as a heat-insulating material when exfoliated, and silica as a thixotropic agent.

Claim 21

A plastic composition for use as a sealant and which at least when hardened is resistant to fire, comprising polyvinyl butyral as a flexible film-forming adhesive polymer, a volatile non-flammable solvent, aluminum trihydrate as a fire retardant, exfoliatable vermiculite to act as a heat-insulating material when exfoliated, and silica as a thixotropic agent.

Claim 22

A plastic composition according to claim 19, comprising 3-8 parts by weight of polyvinyl butyral; 4-12 parts by weight of aluminum trihydrate; 4-12 parts by weight of vermiculite; 0.5-2 parts by weight of silica and a volatile non-flammable solvent in an amount sufficient to make the composition plastic.