Smoke suppressants
AssigneeThe Sherwin-Williams Company
InventorsWai-Kwong Ho, Joseph K. Walker
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Abstract
The present invention is directed to smoke suppressants based on ammonium octamolybdate chemistry. According to this invention, the precipitation of ammonium octamolybdate in the presence of an inert mineral core produce a novel high surface area ammonium octamolybdate smoke suppressant. The high surface area significantly increases the smoke suppression performance over a standard ammonium octamolybdate. This invention is also directed to a process for making the high surface area ammonium octamolybdate smoke suppressant. The smoke suppressant of this invention is particularly suitable for smoke suppression in polyvinyl chloride (PVC) applications.
Claims17
A smoke suppressant comprising:
- a) from about 15% to about 80% by weight of an inert core material;
- b) from about 20% to about 85% by weight of ammonium octamolybdate;
- wherein the ammonium octamolybdate is obtained from an in situ reaction of ammonium dimolybdate and molybdenum trioxide;
- and wherein the in situ reaction occurs in the presence of the inert core material.
- wherein the ammonium octamolybdate particles obtained from the in situ reaction have substantially rod-shaped morphology
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A thermoplastic polymer composition comprising:
- a) a chlorine-containing polymer;
- and
- b) a smoke suppressant compound comprising:
- (a) from about 15% to about 80% by weight of an inert core material;
- (b) from about 20% to about 85% by weight of an ammonium octamolybdate;
- wherein the ammonium octamolybdate is obtained from an in situ reaction of ammonium dimolybdate and molybdenum trioxide;
- and wherein the in situ reaction occurs in the presence of the inert core material;
- and
- wherein the ammonium octamolybdate particles have substantially rod-like morphology.
A method of improving the smoke suppressant characteristics of a polymeric composition, comprising:
- (a) preparing a smoke suppressant material comprising:
- 1. from about 15% to about 80% by weight, based on the weight of the smoke suppressant material, of an inert core material;
- and
- 2. from about 20% to about 85% by weight, based on the weight of the smoke suppressant material, of an ammonium octamolybdate;
- wherein the ammonium octamolybdate is obtained from an in situ reaction of ammonium dimolybdate and molybdenum trioxide;
- and wherein the in situ reaction occurs in the presence of the inert core material, and wherein the ammonium octamolybdate particles have substantially rod-like morphology,
- (b) compounding the smoke suppressant material with a polymeric formulation.
Dependencies are inferred from the claim text.