JPS58152044A - Flame-retardant styrenic elastomer composition - Google Patents

Abstract

PURPOSE:The titled composition causing no exudation of a flame-retardant, no reduction in flame retardance, no bad appearance, etc., obtained by blending a styrene-butadiene copolymer with a chlorinated ethylenic polymer. CONSTITUTION:An A-B-A Block copolymer (A is polystyrene; B is a polymer prepared by hydrogenating polybutadiene or polyisoprene so that an unsaturated part is saturated) is blended with a chlorinated ethylenic polymer in an amount to give at least >=10wt% chlorine content in the composition. Chlorinated polyethylene, chlorosulfonated polyethylene, etc. are used as the chlorinated ethylenic polymer. If necessary, a flame-retardant auxiliary such as antimony trioxide, zinc borate, etc. is used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a styrenic elastomer combustion composition.

In recent years, thermoplastic elastomers, which can be processed like plastics such as urethane elastomers, and which exhibit rubber-like properties without chemical crosslinking, have been attracting attention. In particular, the recently developed A-B-A block copolymer, in which A is polystyrene and B is polybutadiene or polyisoprene with hydrogen added to crush the unsaturated parts, has excellent electrical insulation properties and is strong. Moreover, it has a high thermal softening temperature of 160° C. or higher, and has good heat deterioration resistance, so it is expected to be developed into insulating sheets, tubes, tapes, etc. in the future. However, this material is inherently flammable, so despite having the excellent characteristics mentioned above,
The field of application was limited. If it could be made flame retardant, it could be used in a wide variety of fields.

The present inventors systematically investigated halogen-based flame retardants containing chlorine and bromine, and phosphorus-based flame retardants that are on the market in order to improve flame retardancy.

As a result, although it was certainly possible to impart flame retardancy, problems such as poor dispersion, deterioration of electrical and mechanical properties, and surface seepage occurred. In particular, with regard to surface seepage, even if it is okay for a short time, long-term evaluations at high temperatures have not found any flame retardant that does not cause surface seepage.

This surface seepage may cause a decrease in flame retardancy, poor appearance, and other negative effects, and requires improvement.

An object of the present invention is to eliminate the above-mentioned drawbacks and provide a styrenic elastomer composition with excellent flame retardancy.

That is, the gist of the present invention is that an A-B-A block copolymer (where A is polystyrene and B is a polymer obtained by adding hydrogen to polybutadiene or polyisoprene to crush unsaturated parts) and chlorinated ethylene The composition is a blend of polymers having a chlorine content of 1096 or more.

Specific examples of the above-mentioned chlorinated ethylene polymer include chlorinated polyethylene and chlorosulfonated polyethylene.

Note that the chlorinated ethylene-based polymer herein refers to chlorinated polymers containing ethylene, such as polyethylene, ethylene propylene copolymer, ethylene vinyl acetate copolymer, and ethylene ethyl acrylate copolymer.

The reason why the amount of chlorine in the blend system is specified is that the desired flame retardance cannot be imparted below this amount.

The flame retardant auxiliary agent is not particularly specified, but may be used if necessary, and includes, for example, antimony trioxide, zinc borate, zirconium oxide, and the like.

In addition, other flame retardants such as perchlorocyclopentadecane, decabromodiphenyl ether, etc. may be used in combination within the range that does not cause oozing.Also, aluminum silicate, magnesium silicate, carbonate Fillers such as calcium, antioxidants, lubricants, and stabilizers may be added. Of course, it is also possible to add other polymers such as polyethylene within a range that does not cause deterioration of properties.

Next, the present invention will be explained in detail with reference to Examples and Comparative Examples shown in Table 1.

Table 1 (Note) The units of numbers in Table 1 are parts by weight.

(Note) To prevent seepage, after mixing the above ingredients at 180℃ or higher,
Press molded at 180°C for 15 minutes into a 2-mold thick sheet, then heated at 120°C for 112 hours and at room temperature for 12 hours.
It was left for 8 months and evaluated while being subjected to a heat cycle.

As is clear from Examples 1 to 4 above, according to the present invention, a composition that does not seep out of the flame retardant, has excellent flame retardancy, and can overcome the various drawbacks mentioned at the beginning. Can be provided.

Procedural amendment (spontaneous) Haruki Shimada, Commissioner of the Patent Office 1, Indication of the case 1982 Patent Application No. 34953 2
Name: Flame-retardant styrenic elastomer composition a
Person making the amendment: Attorney 〒100 Scope of claims of the specification to be amended.

Contents of correction The scope of claims is revised in the attached circular.

List of Attached Documents Attachment 1 or more Claims 1, A-B-A block copolymer (A is polystyrene, B is a polymer obtained by adding hydrogen to polybutadiene or polyisoprene to crush unsaturated parts.

) and a chlorinated ethylene polymer, the blend having a chlorine content of at least 10 inches.

2. The flame-retardant styrenic elastomer composition according to claim 1, wherein the chlorinated ethylene polymer is chlorinated polyethylene or chlorosulfonated polyethylene.

Commissioner of the Japan Patent Office Shima 1) Indication of the Haruki-dono 1 case 1982 Patent Application No. 349
53 No. 2 Name of the invention Flame-retardant styrenic elastomer composition 3 Relationship to the case of the person making the amendment Patent Applicant Maru Choda Address Address 2-1-2 Marunouchi, Chiyoda-ku, Tokyo Pitachi Densen Name (512) Hitachi Electric Cable Co., Ltd. 4 Managing Director 100 Address 2-1-2-13 Marunouchi, Chiyoda-ku, Tokyo Detailed explanation of the invention in the specification subject to the amendment Contents of the amendment Page 6, line 6 and Insert the second daughter between the 7th line.

"In addition, the styrene elastomer in Table 1 is A
REXEARG8900 (trade name, Aron Kasei Co., Ltd.) was used. ” One or more -

Claims (1)

[Claims] tAIB-A block copolymer (where A is polystyrene and B is a polymer obtained by adding hydrogen to polybutadiene or polyisoprene to crush unsaturated parts. A blend of chlorinated ethylene polymers) and the chlorine content in the blend is at least 10
% flame retardant styrenic elastomer composition. 2. The flame-retardant styrenic elastomer composition as set forth in claim 1, wherein the chlorinated ethylene polymer is chlorinated polyethylene or chlorosulfonated polyethylene.