Low melting phosphate-sulfate glasses as intumescent flame and/or smoke retardants for polymers
AssigneeThe B. F. Goodrich Company
InventorRonald E. Myers
Life of this patent
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Abstract
A polymeric flame retardant composition comprises low melting temperature phosphate-sulfate glass compositions in an amount of from about 10 to about 100 parts by weight per 100 parts by weight of said polymer. Desirably, the polymer is a halogen-containing polymer. The phosphate-sulfate combination has been found to produce synergistic results.
Claims12
A flame and/or smoke retardant polymeric composition, comprising:
- (a) a polymer selected from the group consisting of a rigid or plasticized polyvinylchloride, a polyvinylidene chloride, a polyolefin wherein said olefin is made from monomers having from 2 to 12 carbon atoms, a polychloroprene, a polyamide, a polyester, a polyurethane, polymers of acrylonitrile alone or with styrene, and combinations thereof, and
- (b) from about 10 parts to about 100 parts by weight per 100 parts by weight of said polymer of a phosphate-sulfate low melting temperature glass composition having an average particle size of from about 0.1 micron to about 250 microns, the amount of phosphate glass component based upon the total amount of phosphate glass component and sulfate glass component in said glass composition being from about 18 to about 60 mole present and the amount of said sulfate glass component in said glass composition is from about 82 to about 40 mole percent of the total amount of phosphate glass component and sulfate glass component in said glass composition.
A phosphate-sulfate glass composition for imparting improved flame and/or smoke retardant properties to a polymer selected from the group consisting of a rigid or plasticized polyvinylchloride, a polyvinylidene chloride, a polyolefin wherein said olefin is made from monomers having from 2 to 12 carbon atoms, a polychloroprene, a polyamide, a polyester, a polyurethane, polymers of acrylonitrile alone or with styrene, and combinations thereof, said composition comprising from about 18 to about 60 mole percent of phosphate glass components and from about 82 to about 40 mole percent of sulfate glass components, said glass composition having an average particle size of from about 0.1 to about 250 microns.
Dependencies are inferred from the claim text.