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US 8,557,906 B2Granted
Flame resistant polyolefin compositions and methods for making the same
AssigneeExxonMobil Chemical Patents Inc.
InventorRandal Howard Kerstetter, III
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AssigneeExxonMobil Chemical Patents Inc.
InventorRandal Howard Kerstetter, III
Estimating the term…
A flame-retardant composition having (a) a copolymer comprising at least about 50 wt. % of propylene-derived units, and about 5-35 wt. % of units derived from at least one of ethylene or a C4-10 alpha-olefin, wherein the copolymer has a heat of fusion of about 75 J/g or less; and (b) a flame retardant, wherein the composition satisfies the requirements of UL94 with a V2 rating.
A flame-retardant composition comprising:
A method for making a flame-retardant composition, comprising combining:
A flame-retardant composition comprising:
Dependencies are inferred from the claim text.
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Not modified by chemical after-treatment: homopolymers or copolymers of propene
Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59: flame-proofing or flame-retarding additives
Copolymers of propene: at least partially crystalline copolymers of propene with other olefins
Organic materials: containing halogen
About 4 years 9 months of term left · ends 27 Jul 2031 (estimated)
Embodiments of the present invention are directed toward polyolefin compositions that exhibit desirable flame resistance and methods for making them.
Polyolefins are widely used as plastics and demonstrate superior moldability, solvent resistance and mechanical strength, possess a low specific gravity, and are inexpensive as materials in the fields of automobile parts, electric/electronic parts, electric products for domestic use, blown and cast film, molded goods, calendered and extruded profiles, and the like.
Polyolefins have been modified with various additives. For example, inert fillers, such as clays, have been added to facilitate manufacture and add economic value to the compositions. And, carbon black has been added as a colorant or as a UV protectant. In some applications it is desirable that the polyolefins are flame resistant. Accordingly, flame retardants may be added to the polyolefin to render the polyolefins flame resistant. Commonly used flame retardants include inorganic flame retardant such as magnesium hydroxide or aluminum hydroxide, halogenated flame retardants such as decabromodiphenyl ether, non-halogenated flame retardants such as ammonium carbamylpolyphosphate, or a flame retardant filler package which may be a combination of any of the above.
Introduction
Embodiments of the invention are based, at least in part, on the discovery of a polyolefin composition having flame resistance, weatherability, and maintained or improved mechanical properties. In particular, it has been discovered that polyolefins can be modified with both flame retardants and sufficient carbon black to provide polyolefin compositions that are advantageously capable of meeting the flame-resistance standards of UL94V2 and the ultraviolet light (UV) standards of UL746CF1. It has been surprisingly discovered that these polyolefin compositions can exhibit desirable mechanical properties despite the presence of the flame retardants and the carbon black. As a result, these polyolefin compositions can be used in high temperature, outdoor applications such as for seals, gaskets, and hoses for outdoor lighting and electrical applications including those devices that capture and convert solar energy.
Polyolefin Compositions