JPS5830901B2 - Seikei Yoso Saibutsu - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a styrenic polymer, at least 1.0% by weight of poly(F7) diphenyl carbonate containing from 6 to 10 halogen atoms, and at least 0.5% by weight of antimony trioxide.
% by weight of a thermally stable, flame retardant, thermoplastic molding composition.

The halogen atom of the polyhalodiphenyl carbonate may be chlorine, bromine or a mixture thereof.

With the recent rapid development of industry, organic synthetic polymers have been increasingly used in applications such as decoration, building materials, daily necessities, buildings, buildings, and the insulation industry.

Polystyrene has excellent transparency, electrical properties and thermoplasticity, and is therefore frequently and extensively used in the various fields mentioned above.

However, polystyrene homopolymers tend to be brittle and are therefore often modified by copolymerization with other monomers or compounded with impact modifiers such as rubbers.

Another method to improve impact strength is to graft elastomer blocks onto the polystyrene backbone or introduce elastomer blocks within the polymer backbone.

Other comonomers may be used to improve chemical and/or thermal resistance.

Flammability or combustibility is a property of many polymers, which places severe limitations on their general use.

As the use of styrenic polymers becomes more profitable, it becomes desirable that these polymers not only have superior physical properties but also be non-flammable, and therefore various flame-resistant styrenic polymers are available. Research has been conducted on.

For example, halogenated aliphatic hydrocarbons such as 1,1°2.
2-tetrabromoethane, 1,2,3.4tetrachloroethane, ■,2-dibromoethane (Japanese Patent Publication No. 37-573
9), 2-chloro-1,2,3,4 tetrabromobutane (Japanese Patent Publication No. 41-20216), chlorinated paraffin waxes and similar substances, haloalkyl phosphates such as tris-(2,3-dibromopropyl) phosphate (Japanese Patent Publication No. 41-20216), Kosho 336788) etc., and 2,3-dibromopropano-
Acetals or ethers of Ru 1 (Special Publication Publication No. 35-7
089) is known as a flame retardant for polystyrene.

Chlorinated and brominated aromatic compounds tended to be more effective as flame retardants for styrenic polymers than halogenated aliphatics.

Therefore, because of its high compatibility and low volatility,
Hexabromobenzene, brominated chlorinated diphenyls and fully halogenated decabromodiphenyl ether or decachlorodiphenyl ether were widely used.

This is true in U.S. Patents 2022634 and 218890.
3, 3072728, 3347822 and 372
8304 as an example.

The use of most halogenated compounds, especially aromatics, has been accompanied by considerable concern about the potential for permanent toxicological effects.

Also, these additives tend to yellow the polymer when exposed to light.

German published application DAS 1201544 describes a flame-resistant polymer that is made flame-resistant by adding 25 to 40% by weight of chlorinated hexamethylbenzenes based on the polymer composition together with an oxygen compound or a sulfur compound of an element in main group Ⅰ of the periodic table. Molding compositions are described.

However, the addition of additives at this level has a detrimental effect on the mechanical properties of the matrix polymers.

styrenic polymer, at least 1.0% by weight polyhalodiphenyl carbonate containing 6 to 10 halogen atoms, and at least 0.5% antimony trioxide;
It has been found that thermoplastic molding compositions containing a mixture of % by weight are flame resistant (flame retardant).

Polyhalodiphenyl carbonate and antimony trioxide are more effective than other halogenated aromatic compounds.
It makes styrenic polymers flame resistant by significantly reducing the yellowing of the compound when exposed to light.

Also, polyhalodiphenyl carbonate and antimony trioxide do not significantly affect the properties of styrenic polymers as do many conventional additives.

Furthermore, the processability of the styrenic polymer in terms of melt stability and flow under normal processing conditions is not affected by the polyhalodiphenyl carbonate and antimony trioxide additives.

Styrenic polymers for use in the present invention include polystyrene, poly-alpha-methylstyrene and styrene- or alpha-methylstyrene-containing copolymers copolymerized with at least 50% styrene or alpha-methylstyrene.

As copolymer components, acrylonitrile, butadiene, and esters of acrylic or methacrylic acid can be used.

Typical examples of styrenic polymers rendered flame resistant in accordance with the teachings of the present invention include polystyrene, polyalpha-methylstyrene, polybutylstyrene, copolymers thereof, and polymers containing co-reacted or blended elastomers. Included are permeable polystyrene, styrene acrylonitrile polymer, acrylonitrile butadiene-styrene (ABS) polymer, copolymer of styrene and acrylic or methacrylic acid or ester, copolymer of maleic anhydride or ester and styrene, etc. .

Kirk-Oth for the preparation of styrene polymers.
mer's "Encyclopedia of Che"
micalTechnology”Vol, 13(1
954), page 146-179, item "5tyrene"
Re5ins and Plasties”.

Polyhalodiphenyl carbonates that can be used in the practice of this invention contain from 6 to 10 halogens, where the halogens are bromine, chlorine, or mixtures thereof.

These polyhalodiphenyl carbonates are fully described in US Pat. No. 3,382,207, which is incorporated herein by reference.

Polyhalodiphenyl carbonates that can be used in the present invention include hexabromodiphenyl carbonate, decabromodiphenyl carbonate, hexachlorodiphenyl carbonate, decachlorodiphenyl carbonate, and mixtures thereof.

A preferred polyhalodiphenyl carbonate is decabromodiphenyl carbonate.

Polyhalodiphenyl carbonates can be used in amounts of at least 1.0% by weight.

A preferred amount is from about 1.0 to about 20% by weight;
is based on the weight of the styrenic polymer.

The compositions of the present invention contain antimony trioxide in an amount of at least 0.5% by weight.

Preferably, the amount of antimony trioxide used in the present invention is from about 0.5% to about 10.0% by weight;
is based on the weight of the styrenic polymer.

It must be understood that the degree of flame retardation increases with increasing polyhalodiphenyl carbonate content.

Antimony dioxide is a co-reactant with the halogenated compound and must be present in an amount comparable to the halogenated compound.

In addition to polyhalodiphenyl carbonate and antimony trioxide, the thermoplastic molding composition of the present invention may contain other conventional additives such as stabilizers, lubricants, fillers, plasticizers, colorants, etc. can.

The following examples clearly illustrate the principles and practice of the invention to those skilled in the art.

Unless otherwise stated, parts are parts by weight.

Example 1 100 parts of high impact polystyrene was injection molded to give 0.09
Make a test bar of 0"Xo, 500" x 5".

These test bars are subjected to the following tests.

Underwri-ters Laboratory
s 5 object 94 (U, L.

94) flame test, oxygen index ASTM D2683-70
, heat distortion temperature ASTM D648, and Izod impact A
STMD256, these results are shown in the table.

Example 2 100 parts of high impact polystyrene, 12.3 parts of decabromodiphenyl carbonate and 5.0 parts of antimony trioxide are compounded in a 1" Wayne extruder and the extrudate is subdivided into pellets.

This pellet was injection molded into a test bar, and the test bar was prepared in Example 1.
Test as shown.

The results are shown in the table. Example 3 Example 2 is repeated except that decabromodiphenyl ether is used instead of decabromodiphenyl carbonate.

The results are shown in the table. As can be seen from the table, the use of polyhalodiphenyl carbonate with antimony dioxide in accordance with the present invention results in non-flammability and yet compared to the use of no flame retardant additive or the use of conventional additives. The receiver maintains sufficient heat deformation temperature and Izotsu impact characteristics.

Also, the use of polyhalodiphenyl carbonate with antimony dioxide in styrenic polymers significantly reduces the yellow color of the polymer upon exposure to light than does the use of other halogenated aromatic additives.

Among other things, it is clear from the foregoing description that the above objects are effectively achieved, and that it is within the scope of the present invention to make certain changes in carrying out the above method or constituting the above composition. All points contained in the above description are to be interpreted as illustrative and not in a limiting sense, as they may be added to without departing from them.

Claims (1)

[Claims] 1 Styrenic polymer, containing a mixture of 1.0 to 20% by weight of polyhalodiphenyl carbonate containing 6 to 10 halogen atoms and 0.5 to 10.0% by weight of antimony trioxide, where the weight □ is styrene. A thermally stable, flame retardant, thermoplastic molding composition based on the weight of the polymer and wherein said halogen atom is selected from bromine or chlorine or mixtures thereof.