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
1988-04-05
1989-11-07
Lilling, Herbert J.
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...
524437, 524456, 524494, 524556, 524563, 524577, 524584, 524586, 524606, C08K 322, C08L10100, C09K 2102
Patent
active
048793329
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention is appliable to the field of preparing a synthetic resin composition of a flame resisting material.
BACKGROUND ART
Recently, a wide variety of flame resisting synthetic resin compositions have been developed with the purpose of ensuring the safety against a fire. Among them, flame resisting synthetic resin compositions not containing halogen, phosphorus or antimony trioxide, i.e., so-called non-toxic flame resisting synthetic resin compositions of a halogen-free type are given special attention.
Generally, such a flame resisting synthetic resin composition of a halogen-free type contains an inorganic filler such as aluminum hydroxide or magnesium hydroxide. Further, the amount of the inorganic filler required to obtain sufficiently high flame resisting effect is generally 30 to 70% by weight based on the composition. However, a synthetic resin composition containing an inorganic filler in such a high content does not generally exhibit well-balanced strength, so that it is brittle and poor in processability.
Further, some synthetic resin compositions containing such a flame resistant filler alone do not exhibit sufficient flame resistance. Thus the simultaneous addition of such a filler and carbon black has been attempted with the purpose of overcoming these problems (see Japanese Patent Publication No. 10898/1982). The simultaneous addition thereof is known to impart high flame resistance to a synthetic resin, even when the amount of a flame resistant filler is relatively small. However, the halogen-free flame resisting compositions thus prepared are all black, so that they can not be applied to the fields wherein color discrimination is necessitated or the fields wherein importance is attached to appearance, i.e., the fields wherein the use of a black material is unfavorable (for example, wall covering material).
DISCLOSURE OF INVENTION
An object of the present invention is to provide, without using carbon black, a halogen-free flame resisting synthetic resin composition. Thus making it widely appliable to the field wherein a color-discriminable flame reisting composition must be used. In addition to fields wherein importance is attached to appearance, for example, wall covering material.
More particularly, the present invention relates to a self-fire extinguishable, halogen-free and flame resisting synthetic resin composition. This is obtained by adding 0.5 to 15 parts by weight of a synthetic silicate (also called "hydrated silicic acid" or "wet silica") to a mixture comprising 70 to 30 parts by weight of a thermoplastic synthetic resin and 30 to 70 parts by weight of magnesium hydroxide or aluminum hydroxide having an average particle size of 0.1 to 10 .mu.m.
BEST MODE FOR CARRYING OUT THE INVENTION
Synthetic Resin
The synthetic resin to be used in the present invention may be any one as far as it is thermoplastic, and examples thereof include crystalline polyolefins such as polyethylene, ethylene-vinyl acetate copolymer (abbreviated to "EVA"), ethylene-ethyl acrylate copolymer (abbreviated to "EEA"), ethylene-methyl methacrylate copolymer (abbreviated to "EMMA") and polypropylene (abbreviated to "PP"), polystyrene, polyacrylonitrile, acrylonitrile-butadiene-styrene copolymer (abbreviated to "ABS"), nylon-6 and nylon-6,6. It is preferred from the viewpoint of the strength of the resulting composition that the resin have a melt index of 0.2 to 10.0.
Inorganic flame retardant
The inorganic flame retardant to be used in the present invention is aluminum hydroxide or magnesium hydroxide having a particle size of 0.1 to 10 .mu.m.
According to the present invention, such a flame resistant filler may be added in an amount of 30 to 70% by weight based on the composition to thereby impart flame resistant effect to the resin.
Synthetic Silicate
The synthetic silicate to be used in the present invention is generally called "hydrated silicic acid" or "wet silica". Further, it does not have a specified crystalline structure but a network structure of Si-O, so
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Noda Mitsuo
Saito Nobuo
Dainichiseika Color & Chemicals Mfg. Co. Ltd.
Lilling Herbert J.
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