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US 4,785,031 AGranted
Stabilized and carried red phosphorus as flame-retardant agent for polymers
AssigneeSaffa S.p.A.
InventorLuciano Scarso
Life of this patent
Estimating the term…
Abstract
Stabilized and carried red phosphorus as anti-flame agent for polymers, having its individual particles encapsulated into a synthetic resin, said particles being moreover aggregated to one another to form a plurality of pellets, each one of said pellets being constituted by a plurality of said particles bonded to one another by means of polyethylene with a density of 0.910-0.925 g/ml, and a melt index of 55-150, as expressed as g/10 minutes.
Claims8
A granular flame-retardant agent for plastic materials, comprising:
- 50-90% by weight of particulate red phosphorus having individual particles encapsulated with a synthetic resin;
- and
- 10-50% by weight of a binder-carrier for said red phosphorus, wherein said binder-carrier is an ethylene polymer selected from the group consisting of polyethylene and ethylene copolymers containing at least 70% by weight of ethylene having a density (g/ml) of 0.910-0.925, and melt-index (expressed as g/10 minutes, according to ASTM-D 1238/ Condition E) within the range of approximately from 55 to 150 wherein said granular flame-retardant agent comprises pellets prepared by granulating the aggregate formed by the mixture of said ethylene polymer binder-carrier and said encapsulated red phosphorus particles.
Dependencies are inferred from the claim text.