Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1992-05-22
1994-05-31
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524312, 524315, 524398, 524399, 524400, 524436, 524437, 524520, 524523, 524524, 524529, 524536, C08K 510
Patent
active
053170512
DESCRIPTION:
BRIEF SUMMARY
INDUSTRIAL UTILIZATION FIELD
The present invention relates to a flame-retardant olefin polymer composition capable of affording a molded product superior in mechanical strength, heat resistance and surface whitening preventing property, the said olefin polymer composition consisting principally of a polyolefin, particularly at least one ethylene copolymer selected from the group consisting of ethylene-.alpha.-olefin copolymer, copolymers of ethylene and unsaturated carboxylic acids or esters or metallic salts thereof and ethylene-vinyl ester copolymers, and an olefin polymer modified with an unsaturated carboxylic acid or a derivative thereof.
PRIOR ART
Polyethylenes are general-purpose resins greatest demand which are superior in physical and chemical properties, so are formed into films, sheets, pipes, containers, etc. by various methods, including extrusion, injection molding and rotational molding, and are applied to various domestic and industrial uses.
Since such polyethylenes are easy to burn, various methods have heretofore been proposed for rendering them flame-retardant. Among them, the most general method is to add a flame retardant containing halogen or phosphorus to the polyethylenes.
However, although the addition of a small amount of such flame retardant is effective, there is the drawback that a noxious gas is evolved during combustion.
Recently, as low-smoking and pollution-free flame retardants which do not evolve a noxious gas during combustion, inorganic flame retardants such as a aluminum hydroxide and magnesium hydroxide have met such needs and are rapidly increasing in demand. (Related techniques are disclosed, for example, in Japanese Patent Laid Open Nos.132254/1976 136832/1981.)
In the conventional commercial polyethylenes, the acceptability of particularly inorganic flame retardants is poor and the flame retarding effect thereof is low. Besides, with increase in the amount of loading, the mechanical strength as well as flexibility and processability deteriorate to an impractical extent.
Further, when the conventional polyethylenes containing such inorganic flame retardants as electric wires or cables, their surfaces are flawed, causing whitening, during laying or use thereof.
PROBLEMS TO BE SOLVED BY THE INVENTION
According to the present invention, in view of the above-mentioned points, there is provided a flame-retardant polyolefin resin composition superior in mechanical strength, heat resistance, processability and flame retardance, having a remarkable resistance to whitening and also having an improved acid resistance. This composition can be applied to various uses, including electric wires, cables, packages, sealing materials, hoses, films, molded products, e.g. injection-molded products, and master batches.
MEANS FOR SOLVING THE PROBLEMS
The present invention resides in a flame-retardant olefin polymer resin composition comprising:
100 parts by weight of a resin component consisting principally of: acid or a derivative thereof; preventing agent) selected from the group consisting of: fatty acid-, aliphatic amino-, fatty acid amide-, alkylphenol- or alkylnaphthol-alkylene oxide adduct, and
Example of the polyolefin resin used as component a) in the present invention include homopolymers and copolymers of .alpha.-olefins such as ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene and 1-decene, copolymers of ethylene with unsaturated carboxylic acids or esters or metallic salts thereof, and ethylene-vinyl ester copolymers, e.g. an ethylene-vinyl acetate copolymer. Particularly copolymers of ethylene with unsaturated carboxylic acids or esters or metallic salts thereof, ethylene-vinyl ester copolymers, and ethylene-.alpha.-olefin copolymers ranging in density from 0.86 to 0.91 g/cm.sup.3 are preferred.
As examples of the above unsaturated carboxylic acids or esters thereof and vinyl esters there are mentioned unsaturated carboxylic acids such as acrylic acids, methacrylic acid, maleic acid, fumaric acid, maleic anhydride and itaconic anhydride; unsaturated c
REFERENCES:
patent: 4845146 (1989-07-01), Inoue et al.
patent: 4851463 (1989-07-01), Opsahl et al.
Harashige Masahiro
Inoue Takashi
Kaneko Satoru
Kawamura Tsutomu
Tokutake Atsuo
Bleutge John C.
Nippon Petrochemicals Co. Ltd.
Sweet Mark
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