FR2467228A1 - THERMOPLASTIC MOLDING COMPOSITION BASED ON POLY (OXYPHENYLENE) - Google Patents

Abstract

Self-extinguishing composition exhibiting superior processing ability. It comprises a normally flammable composition comprising i a poly (oxyphenylene) resin, and ii a polymer selected from the group consisting of hydrogenated block copolymers A-B-A ** 1 and hydrogenated radial remote block copolymers; b an aromatic phosphate compound in an amount at least sufficient to render the composition a normally flammable self-extinguishing, and c a small amount of polystyrene of low molar mass. Application to molding.

Description

The present invention relates to novel molding compositions

  thermoplastics that are self-extinguishing and that: one can easily mold to obtain finished articles that

  have good shock resistance and a very good

  surface lant. More particularly, the invention relates to thermoplastic compositions consisting of poly (oxyphenylene) resin, a polymer selected from hydrogenated ABA block copolymers and hydrogenated radial telesequency copolymers, of an aromatic phosphate present in an amount sufficient to flame retard. the thermoplastic material, and a small amount of a low molecular weight polystyrene. Poly (oxyphenylene) resins are well known in the art as a group of thermoplastic materials

  which have many exceptional physical properties

  tional. They can be prepared according to oxidizing processes or not,

  like those described, for example, by US patents.

  United States of America Nos. 3,306,874, 3,306,875, 3,257,357 and 3,257,358.

  It was found that many properties could be improved.

  poly (oxyphenylene) resins, for example, ease of processing, impact resistance and solvent resistance, by combining these resins with other resins, such as,

  for example polystyrene. Examples of composi-

  poly (oxyphenylene) and polystyrene resins in

  U.S. Patent 3,383,435.

  It has been discovered more recently that it is possible to combine poly (oxyphenylene) resins with copolymers

  A-B-A1 type sequences, for example, polystyrene copolymers,

  ethylene-polybutadiene-polystyrene and resins containing diene rubbers modified with acrylic resins to obtain compatible compositions which, once molded

  characterized by many excellent physical properties.

  These inventions are described in US patents

  United States of America Nos. 3,833,688, 3,792,123 and 4,167,507.

  It is known in the art that poy (oxyphenylenes)

  have excellent fire resistance properties and are classified as self-extinguishing and non-stagnant in accordance with

  to the ASTM D635 test method and Bulletin 94 of the Under-

  writers Laboratories. On the other hand, when combining

  poly (oxyphenylenes) with other polymers such as copoly-

  A-B-A1 sequence mothers cited above, and hydrogenated radial dial copolymers, many of the resulting compositions exhibit low fire resistance and are not self-extinguishing but burn slowly when

  lit them. As a result, many compositions

  of poly (oxyphenylene) resin and resins containing

  A-B-A block copolymers or linear copolymers

  hydrogenated radial quenches do not meet the minimum requirements

  quality standards established by different testing laboratories

  Underwriters Laboratories, which restricts the use of

  these compositions by numerous applications

commercial.

  Flame retardant additives for thermoplastics

  ticks are known. In general, they are physically blended with the thermoplastic or they are used in such a way that they chemically separate with the plastics material and the

  change. For example, self-extinguishing mixtures of a

  Poly (oxyphenylene) and styrene resin resins, flame retarded by a combination of an aromatic phosphate and an aromatic halide, are described in US Pat. No. 3,639,506. extinguisibles of poly (oxyphenylene) and polystyrene are described in the patent

  United States of America No 3 809 729, where halogenated

  aromatic creatures combined with compounds of antimony

  flame retardant additives. Other flame retardant compositions of a poly (oxyphenylene) resin and a styrene resin which include various phosphorus-containing and halogen-containing flame retardants are described in United States Patent Application No. 647,981 of US Pat. December 27, 1975

  However, as is also well known, the incor-

  poration of flame retardant compounds in

  plastics not only modifies their fire behavior but frequently modifies other physical properties, such as color, flexibility, tensile strength,

2467228,

  electrical properties, the softening point and the

  propriétésdemoulage. Thus, for example, phos-

  aromatic phates such as triphenyl phosphate to

  poly (oxyphenylenes) and styrene resins, from

  to improve their fire resistance to the point of

  classify these compositions as self-extinguishing and non-stil-

  in accordance with ASTM Test Method D635 and U.L.

Bulletin No. 94.

  It has also been found that molded compositions

  poly (oxyphenylene) or different combinations of

  poly (oxyphenylene) and certain polymeric modifying agents.

  and aromatic phosphate compounds had excellent self-extinguishing, impact resistance and acceptable surface gloss properties. These compositions

  are described in the US patent application.

  No. 870,984, January 20, 1978, Although the compositions mentioned above have both a high load deflection temperature,

  good impact resistance and good self-healing properties

  extinguishing, they present certain difficulties of trans-

  training and lead to a product that has a bright

  surface, which, though good, can be improved by the use of

  composition of the present invention.

  It has now been unexpectedly discovered that molding compositions consisting of poly (oxyphenylene) or various combinations of poly (oxyphenylene) and certain

  polymeric modifying agents with phosphorus compounds

  aromatic pest, mixed with a small amount of polystyrene

  of low molar mass, lead to

  which have excellent self-extinguishing properties

  bllity, high impact resistance, better ability

  to the transformation and a much better surface gloss.

  In accordance with the present invention,

  thermoplastic molding compositions, self-extinguishing flame retardants

  guibles which have excellent processability

  which, after molding, are shock-resistant and pre-

  feel a very good surface gloss, these compositions

2467228,

  intimate mixing: (a) a normally flammable composition comprising (i) a poly (oxyphenylene) resin and (ii) a selected polymer

  in the group consisting of hydrophilic block copolymers

  A-B-A1 genes and hydrogenated radial-phase copolymers. (b) an aromatic phosphate compound in a quantity

  at least sufficient to make self-pxtinguible

  normally flammable and, (c) a small amount of molar mass polystyrene

low.

  The poly (oxyphenylene) resins of (a) are preferably

  of the type corresponding to the structural formula: Q

<X

Q

  wherein the oxygen atom of the ether group is attached to the benzene ring of the adjacent unit, n is a positive integer of at least 50, and each of Q is a monovalent substituent selected from the group

  consisting of hydrogen, halogens, hydrogen radicals,

  carbon containing no tertiary carbon atoms in alpha, the halogenated hydrocarbon radicals having at least two

  between the halogen atom and the phenyl nucleus, the radicals

  oxyhydrocarbons and halogenated oxyhydrocarbon radicals

  with at least two carbon atoms between the halogen atom

gene and the phenyl nucleus.

  Particularly preferred among the poly (oxyphenylene) resins which can be used for the compositions of this invention are those wherein, in the above formula, each of the Q groups represents an alkyl group, and more preferably, an alkyl group containing 1 to 4 carbon atoms. Among these resins, for example, there may be mentioned poly (2,6-oxydimethyl-1,4-phenylene), poly (2,6-oxydiethyl-1,4-phenylene); poly (2-oxymethyl-6-ethyl-1,4-phenylene),

  poly (2-oxymethyl-6-propyl-1,4-phenylene), poly (oxydipro-

  2,6-phenyl-1,4-phenylene), poly (2-oxypropyl-6-phenylphenyl)

  lene-1,4), etc. Poly (2,6-oxydimethyl-1,4-phenyl) preferably has a viscosity limit of about 0.45 deciliters per gram.

  (dl / g) measured in chloroform at 30 C.

  The hydrogenated block copolymers A-B-A1 of component (a) (ii) are well known. These are generally block copolymers of the type A-B-A1 in which the terminal sequences

  A and A1 are identical or different and before their

  including homopolymers or copolymers de-

  vinylaromatic hydrocarbons, and in particular

  vinylaromatic hydrocarbons in which the aromatic residue

  tick can be monocyclic or polycyclic. Examples of monomers include styrene, alpha-methylstyrene, vinylxylene, ethylvinylxylene, vinylnaphthalene, and the like. The central B blocks are always derived from a conjugated diene, for example butadiene, isoprene, 1,3-pentadiene, etc. The central sequence B will preferably consist of

  polybutadiene or with polyisoprene.

  It is recommended to form terminal sequences A and A1 which have mean molar masses of between 4000 and 115 000 and a central block B having a mass

  average between 20 000 and 450 000. The final sequences

  nals will, in a still more preferred manner, average molar masses of between 8000 and 16000, and the central sequence, an average molar mass of between

  approximately 50 000 and 300 000. The terminal sequences constitute

  preferably from about 2 to 33% by weight and more preferably from 5 to 30% by weight of the total block copolymer. We recommend

  especially the block copolymers of the type AB-A1 com-

  taking a central polybutadiene block, in which from 35 to 55%, or preferably from 40 to 50% by weight, of the carbon atoms of the butadiene polymer block are found under

  the shape of vinyl side tracks.

  The unsaturation of the central block of the A-B-A1 block copolymers will be reduced to less than 10% and preferably

  less than 5% of its initial value.

  The hydrogenated block polymers are formed by

  well known to those skilled in the art.

  The preparation of these materials is, for example, described in

  detail in U.S. Patent No. 3,431,323.

  Particularly preferred among the

  hydrogenated quenches Kraton G 1651, a block copolymer

  hydrogenated styrene-butadiene-styrene; that we can get

  Trade in the Shell Chemical Company.

  The hydrogenation can be carried out using various hydrogenation catalysts, such as nickel catalysts on kieselguhr, Raney nickel, copper chromate, molybdenum sulfide, and platinum or other metals. noble finely divided on a low specific surface catalyst.

  Hydrogenation can be carried out anywhere.

  the desired temperature or pressure ranging from, for example, atmospheric pressure to 210.9 kg / cm, the usual range being from 7.03 kg / cm 2 to 70.3 kg / cm 2, and at temperatures between 24 C and 316 C

  for periods of between 0.1 and 24 hours, and

between 0.2 and 8 hours.

  The sequenced radial copolymers useful for the present invention are branched copolymers comprising segments or sequences, and which consist of a saturated rubber, vinyl aromatic polymer and an agent sequences.

  coupling. In particular, in the structure of the copo-

  lymere, several rubber chains and usually three or more, start from a coupling agent and end at

  their other end with a vinylaromatic polymer block

  than. It is generally believed that the incompatibility of the sequence segments in the radial x-ray copolymer promotes the formation of a two-phase system, vinyl aromatic polymer sequences uniting to form regions.

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  or discrete "domains". These domains promote crosslinking between the elastomer chains, and thereby form a branched elastomeric network comprising saturated rubber blocks, vinylaromatic polymer blocks and a coupling agent. Radial sequenced copolymers are known

  in the art. There are, for example, descriptions

  detailed of these materials by Marrs et al in Adhesives Age (the Adhesives era), December 1971, p. 15.20 and by Haïs et al.

  in Rubber world, January 1973, p. 27.

  32. Radial X-ray copolymers are commercially available, or can be prepared according to the prior art techniques. For example, they can be prepared by polymerization of conjugated dienes, for example butadiene, and of compounds

  vinylaromatic, for example styrene, in the presence of a

  an organometallic reactor, for example n-butyllithium, for

  produce copolymers that contain an active metal atom

  tif, like lithium, at one end of each of the polymer chains. These polymers terminated by metal atoms are then reacted with a coupling agent which has at least three active sites capable of reacting with the carbon-metal atom bonds on the polymer chains to take the place of the metal atoms on the chains. Polymers with relatively long branches that radiate from a nucleus formed by the polyfunctional coupling agent are thus obtained. This type of preparation process is described

  in detail in U.S. Patent No. 3,281,383.

  Coupling agents used for radial sequential copolymers can be selected from polyepoxides,

  polyisocyanates, polyimines, polyaldehydes, poly-

  ketones, polyanhydrides, polyesters, polyhalides, etc. These materials may contain two or more types of functional groups, such as the combination of epoxy groups and aldehyde groups or isocyanate groups and halide groups. Coupling agents are described in detail in

  U.S. Patent No. 3,281,383, cited previously.

  Among the conjugated dienes that can be used

2467228 i

  for radial copolymers of

  such as butadiene-1,3, isoprene, 2,3-dimethyl butadiene

  1,3-diene, 1,3-pentadiene, 3-butyl-1,3-octadiene, etc. The vinylaromatic polymers can be prepared from the vinylaromatic compounds of formula II. Among these compounds, mention may be made of styrene, 1-vinylnaphthalene and 2-vinylnaphthalene, and their alkyl, cycloalkyl, aryl, alkaryl and aralkyl derivatives.

  3-methyl-styrene, n-propyl-4-styrene, cyclohexyl

  4-hexyl styrene, 4-dodecylstyrene, 2-ethyl-4-benzyl-styrene

  and p-tolyl-4-styrene, 4- (phenyl-4-n-butyl) styrene, etc. The hydrogenation of radial back-block copolymers to form hydrogenated radial dial copolymers is known in the art and can be carried out according to the invention.

  any of several known processes see, for example

  No. 3,696,088, United States Patent No. 3,696,088.

  In the recommended compositions, the telesee copolymer

  hydrogenated radial quencé will be a radial hydrogenated radiose sequential copolymer of styrene and saturated rubber, the

  terminal sequences are derived from styrene, and from a

  range selected from the group consisting of epoxidized polybutadiene, SiC14, polyisocyanates, polyaldehydes, halogen-substituted hydrocarbons such as sorting

  (bromoethyl) -1,3,5 benzene or tetrachloro-2,5,6,9 decadiene-

  3,7 or mixtures thereof. Collective agents are available.

  epoxidized polybutadiene range particularly recommended

  near Food Machinery Corporation under the trade names Oxiron 2000 and Oxiron 2 001. Coupling agents are described

  in U.S. Patent No. 3,281,383.

  The molar mass of the hydro-radial radial sequential copolymer

  genome and the ratios of its comonomers may vary widely

  is lying. In the preferred embodiments, the molar mass of the hydrogenated radial diblock copolymer will be from about 75,000 to about 350,000 and the copolymer will comprise from 1 to 45 parts by weight of vinyl aromatic compound and from 99 to 55 parts by weight of saturated rubber, for 100 parts

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  by weight of radial sequenced copolymer. The amount of agent

  Coupling present in the copolymer will depend on the particular agent

  particular used and the amount of organometallic initiator

  than used. Relatively small amounts of coupling agent, for example between

  0.02 and 1 part by weight per 100 parts of resin.

  Among the hydrogenated sequenced radial copolymers are Solprene 502 and 512 (containing about 70 parts by weight of hydrogenated butadiene units and about 30 parts by weight of styrene units), which is commercially available from Philips Petroleum Co. ., Stowe, Ohio. These materials also contain a small amount of a coupling agent equal for example to less than one part by weight for

parts by weight of copolymer.

  The aromatic phosphate compound of the compositions of this invention is a compound of the formula: ## STR2 ##

R O -P - OR

0OR2

12 3O

  in which R, R and R can be the same or different

  and represent alkyl, cycloalkyl, aryl, aryl,

  substituted with alkyl groups, aryls substituted with aryl substituted alkyl halogens,

  halogens, hydrogen or any combination of

1 2 3

  provided that at least one of the radicals R, R and R represents

feels an aryl group.

  Typical examples of these compounds are phenyl bisdodecyl phosphate, phenyl phosphate and the like.

  and bisneopentyl, phenylethylene phosphate and hydro-

  hindered phenyl and bis (3,5,5-trimethylhexyl) phosphate, ethyl and diphenyl phosphate, ethyl-2-phosphate

  hexyl and di (p-tolyl), diphenyl phosphate and hy-

  bis (2-ethylhexyl) and p-tolyl phosphate, tritolyl phosphate, bis (2-ethylhexyl) and phenyl phosphate, tri (nonylphenyl) phosphate, phenylmethyl of hydrogen, di (dodecyl) phosphate and

  p-tolyl, tricresylphosphate, triphosphate

  phenyl, dibutyl phenyl phosphate, 2-chloroethyl and diphenyl phosphate, p-tolyl and bis (2,5-trimethyl-5-hexyl) phosphate; 2-ethylhexyl and diphenyl phosphate, diphenyl phosphate and hydrogen, and the like. Phosphates in which the

  R groups represent aryl groups, and more particularly

  First, triphenyl phosphate.

  The respective amounts of the main components of the present compositions may vary widely, for example from 60 to 99 parts by weight for the poly (oxyphenylene) resin and from 40 to 1 parts by weight for the AB-A1 block copolymer or radial sequenced copolymer. With regard to compositions containing AB-A block copolymers, compositions containing no less than about 65% by weight of poly (oxyphenyl) are preferably recommended for 100 parts by weight of all of the resinous components of the present invention.

  composition. With regard to the flame retardant agent

  As an aromatic pellet, it may be used in amounts of from 1 to 40 parts by weight per 100 parts by weight of the total composition to flame retard this composition. In this

  polystyrene component of low molar mass

  it may be used in amounts of 1 to about 10 parts by weight per 100 parts by weight of the

  total composition, and preferably between about 1 and

  5 parts by weight per 100 parts by weight of the composition

  total. The specific quantities used will vary

  of course according to the needs of the particular composition.

  The compositions of the invention may also comprise

  Still further, glass fibers are used as a reinforcing filler and preferably fibrous glass filaments composed of aluminum borosilicate glass and lime which is relatively free of soda and known as "E" glass. We can

  however, use other glasses when the electrical properties

  are not as important, for example, low-sodium glass, known as "C" glass. The filaments are manufactured according to conventional methods, for example 2467228.

  by blowing with air or steam, by blowing with

  me and by mechanical stretching. The most recommended filaments for reinforcing plastics are made

  by mechanical stretching. The diameters of the filaments are

  taken between 0.0028 and 0.019 mm, but these values are not

  critical for the present invention.

  In general, better properties will be obtained if the

  fibrous glass reinforcing charge

  1 to about 80% by weight, and preferably about 10 to about 50% by weight of the combined weight of glass and polymers. Better still, the glass will represent about 10 to

  about 40% by weight of the combined weight of glass and

  born. In general, for direct molding, it will be possible

  use up to about 50% glass without encountering any dif-

  ficulty of flow. However, it is also common to

  to prepare compositions containing larger quantities

  glass, for example up to 70 or 80% by weight

  These concentrations can then be mixed in the usual way.

  with resin blends that are not reinforced with glass to obtain compositions

  what lower glass content desired.

  Other constituents, such as stabilizers, can be added.

  pigments, plasticizers, antioxidants, etc.

for the usual purposes.

  The compositions of this invention can be conventionally prepared by mixing the barrel components to form a premix, extruding the mixture as a continuous base wire, cutting the base wire into pellets or granules and molding the same. pellets or granules to the desired shape. These techniques are well known to those skilled in the art and it is not necessary to give here a more detailed study.

  The following examples relate to compositions according to

  my to the invention. They are given for purely illustrative

  tif and they are not supposed to limit the invention.

EXAMPLES I - V.

  The compositions indicated in Table 1 were prepared

2467228.

  prehomogenizing the components, extruding the mixture and

  by molding the extrudate in the form of test specimens.

  All quantities are expressed in parts by weight. The

  Izod impact strength values are expressed in kgm / cm.

  The tensile yield strength, tensile strength, flexural strength and flexural modulus are expressed in kg / cm 2 x 10. The gloss values are surface gloss values at 450, expressed as units

relative without dimensions.

  Composition: polystyrene Tensile strength limit (kg / cm)

TABLE I

* Resistance

  tensile strength (kg / cm2) (%) Impact resistance Izod (kgm / cm) Impact resistance Gardner (kg / m) Gloss temperature UL94 to 45 under load (Oc) 747,3 773 , 3,766.3 759.2 773.3 620.7 651, 7,651.7 620.4 603.9

37 0.130

0.140

0.173

31 0.162

68 0.184

2,415 2,185 2,530 2,300 2,530

2.3 / 5.0

V-O

1.0 / 4.3

V-O

2.0 / 4.0

V-O

1.0 / 8.7

V-I

7 / 5.3

  Vl 32.0 44.5 53.5, 0 48.5 48.5 All mixtures contain PPO / TPP / Kraton G 1652 / ZnS / ZnO-92/8/8 / 0.15 / 0.15 (parts in weight)

  LOME: Low molecular weight PS (Mn = 2000) sold by Foster Grant.

  KTPL: low molecular weight PS (Mn = 50,000) sold by Arco PPO: [poly (oxyphenylene)] TPP: (triphenyl phosphate) KRATON G 1651: hydrogenated block copolymer of styrene-butadiene-styrene sold by Shell Chemical Company o% a ', rO1 roe CI,

EXAMPLE #

I II IV V Witness

LOME (2)

LOME (4)

KTPL (2)

KTPL (4)

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Claims (34)

  1. Self-extinguishing thermoplastic molding composition   The invention has a superior processability, which after molding is impact resistant and has a much higher surface gloss, characterized in that it comprises, in an intimate mixture: (a) a normally flammable composition comprising: i) a poly (oxyphenylene) resin, and (ii) a polymer selected from the group consisting of AB-A1 hydrogenated block copolymers and hydrogenated radial telescopic polymers, (b) an aromatic phosphate compound in an amount of   at least sufficient to make the composition self-extinguishing   (a) normally flammable, and (c) a small amount of molar mass polystyrene little high.   2. Self-extinguishing composition according to claim 1, characterized in that the poly (oxyphenylene) resin (a) (i) has the formula: Q in which the oxygen atom of the ether group of a unit is connected at the benzene ring of the adjacent unit, n is a positive integer of at least 50, and each Q is a monovalent substituent selected from the group   consisting of hydrogen, halogens, hydrogen radicals,   carbon containing no tertiary carbon atoms alpha, halogenated hydrocarbon radicals having at least two carbon atoms between the halogen atom and the phenyl ring, oxyhydrocarbon radicals and halogenated oxyhydrocarbon radicals having at least two carbon atoms between atom of halogen and the phenyl nucleus.   3. self-extinguishing composition according to claim 2, characterized in that in the poly (oxyphenylene) resin 2467228;   (a) (i), each of the radicals Q represents an alkyl group having from 1 to 4 carbon atoms.   4. Self-extinguishing composition according to claim 3, characterized in that in the poly (oxyphenylene) resin (a) (i), each of the radicals Q represents a methyl group. Self-extinguishing composition according to claim 1,   characterized in that the A-B-A block copolymer of   positing (a) (ii) has, prior to hydrogenation, the characteristics following ticks:   (1) each of the A sequences represents a hydrogen sequence   polymerized aromatic monoalkenyl carbide having an average molecular weight of about 4000 to 115,000; (2) B represents a polymerized butadiene hydrocarbon sequence having an average molar mass of about 20,000 to 450,000;   (3) The A sequences are from 2 to 33 percent by weight of the copolymer: (4) in the B block, 35 to 55 percent of the butadiene carbon atoms are in the form of vinyl side chains, (5) and the unsaturation of the B sequence has been reduced to less than 10% of its initial value.   6. self-extinguishing composition according to claim 5, characterized in that the AB-A1 block copolymer of component (a) (ii) has before hydrogenation the following characteristics: (1) each of the sequences A represents a styrene sequence polymerized having an average molar mass of about 8,000 to 60,000;   (2) B represents a pre-polymerized butadiene sequence   having an average molecular weight of about 50,000 to 300,000, and in the sequence 40 to 50% of the butadiene carbon atoms are in the form of vinyl side chains; (3) the A sequences represent from 5 to 30% by weight of the copolymer and the unsaturation of the B block has been reduced to less than 10% of its initial value.   Self-extinguishing composition according to claim 1, characterized in that the hydrogenated radial diblock copolymer comprises from 1 to 45 parts by weight of vinyl aromatic compound and from 99 to 55 parts by weight of saturated rubber,   and a relatively small amount of a couch   range, per 100 parts by weight of hydrogenated radial sequenced copolymer. 8. self-extinguishing composition according to claim 7, characterized in that in the hydrogenated radial sequenced copolymer, the coupling agent is a polymer selected from the group consisting of polyepoxides, polyisocyanates,   polyimines, polyaldehydes, polyketones, poly-   anhydrides, polyesters and polyhalides.   9. self-extinguishing composition according to claim 7, characterized in that, in the hydrogenated radial diblock copolymer, the vinyl aromatic compound is styrene, the saturated rubber has terminal sequences derived from   styrene and the coupling agent is selected from the group   characterized by epoxidized polybutadiene, SiC14, and mixtures thereof.   10. self-extinguishing composition according to claim 1 characterized in that the aromatic phosphate (b) used as fireproofing agent has the formula: O-3 Il R O - P - OR   Wherein R1, R2 and R3 are the same or different and are alkyl, cycloalkyl, aryl, aryl groups substituted with alkyl groups, aryl substituted with   halogenated, aryl-substituted alkyl, halogenated   genes, hydrogen and any combination of them, with the proviso that at least one of R, R and R represents an aryl group.   Self-extinguishing composition according to claim 10, characterized in that the aromatic phosphate is phosphate triphenyl.   12. self-extinguishing composition according to claim 1, characterized in that the polystyrene of low molar mass is present in an amount between about 1 and 2467228 '   about 10 parts by weight per 100 parts by weight of the total composition.   Self-extinguishing composition according to claim 1, characterized in that the low molecular weight polystyrene is present in an amount of from about 1 to about 5 parts by weight per 100 parts by weight of the total composition.   Self-extinguishing composition according to claim 1, characterized in that it comprises an effective amount of   fiberglass reinforcement charge.   15. Self-extinguishing thermoplastic molding composition   having a superior processability, and which after molding is impact resistant and has a much higher surface gloss, characterized by comprising, as a mixture: (a) a normally flammable composition comprising (i) a poly (oxyphenylene) resin and (ii) a block copolymer A-B-A1   (b) an aromatic phosphate, used as a flame retardant   giant, in an amount at least sufficient to make   extinguishable composition (a) normally flammable.   (c) a small amount of molar mass polystyrene low.   16. Composition according to claim 15, characterized in that the poly (oxyphenylene) resin (a) (i) has the formula: Q 0 X Q in which the oxygen atom of the ether group of a unit is connected at the benzene ring of the adjacent unit, n is a positive integer of at least 50, and each Q is a monovalent substituent selected from the group   consisting of hydrogen, halogens, hydrogen radicals,   carbon containing no tertiary carbon atoms in alpha, the 2467228.   halogenated hydrocarbon radicals having at least two carbon atoms between the halogen atom and the phenyl nucleus, the oxyhydrocarbon radicals and the halogenated oxyhydrocarbon radicals having at least two carbon atoms between the halogen atom and the phenyl nucleus. 17. Composition according to claim 16, characterized in that in the poly (oxyphenylene) resin (a) (i), each of the radicals Q represents an alkyl group having from 1 to 4 carbon atoms.   18. Composition according to claim 17, characterized in that in the poly (oxyphenylene) resin (a) (i), each   radicals Q represents a methyl group.   19. Composition according to claim 15, characterized in that the ABA (a) (ii) block polymer, exhibits, before the hydrogenation, the following characteristics: (1) each of the sequences (A) represents a monoalkenyl hydrocarbon sequence polymerized aromatic having an average molecular weight of about 4000 to 115,000; (2) B represents a polymerized butadiene hydrocarbon sequence having an average molar mass of about 000 to 450,000;   (3) A sequences represent from 2 to 33 percent by weight of the copolymer; (4) in sequence B, 35-55% of the carbon atoms are in the form of vinyl side chains; and (5) unsaturation of the (B) sequence was reduced to less than 10% of its initial value.   20. Composition according to claim 15, characterized in that the AB-A1 block copolymer (a) (ii), which has the following characteristics before the hydrogenation: (1) each of the sequences (A) represents a polymerized styrene sequence having an average molar mass of between about 8000 and 60,000; (2) B represents a polymerized butadiene block having an average molecular weight of about 50,000 to 300,000 and in the sequence 40 to 50% of the butadiene carbon atoms is in the form of vinyl side chains; 2467228.   (3) the sequences (A) represent from 5 to 30% by weight of the copolymer and the unsaturation of the sequence B has been reduced   by hydrogenation to less than 10% of its initial value.   21. Composition according to claim 15, characterized in that the aromatic phosphate used as flame retardant agent has the formula: O 3 R 0 - P - OR IR2 3. 2OR   in which R, R2, and R3 are identical or different and represent alkyl, cycloalkyl, aryl, aryl groups substituted by alkyl groups, aryls substituted by halogens, aryl-substituted alkyls, halogens, hydrogen, and any combination thereof, provided that at least one of R, R and R is represents an aryl group.   22. Composition according to Claim 21, characterized   in that the aromatic phosphate is triphenyl phosphate.   23. Self-extinguishing composition according to claim 15, characterized in that the polystyrene of low molar mass is present in an amount between about 1   and about 10 parts by weight per 100 parts of the composition total.   Self-extinguishing composition according to claim 15, characterized in that the low molecular weight polystyrene is present in an amount of from about 1 to about 5 parts by weight per 100 parts by weight of the total composition.   25. A composition according to claim 15, characterized in that it comprises an effective amount of a charge of reinforcing glass fibers.   26. Self-extinguishing thermoplastic molding composition   characterized in that it has excellent processability, and after molding is impact resistant and has a much higher surface gloss, characterized in that it comprises, as a mixture: (a) a normally flammable composition comprising (i) 2467228.   a poly (oxyphenylene) resin, and (ii) a hydrogenated radial diamequence copolymer,   (b) an aromatic phosphate used as a flame retardant   giant, in an amount at least sufficient to make   extinguishable composition (a) normally flammable, and, (c) a small amount of molar mass polystyrene low.   27. Composition according to claim 26, characterized in that the poly (oxyphenylene) resin (a) (i) has the formula: Q / f \ I   Wherein the oxygen atom of the ether group of a unit is connected to the benzene ring of the adjacent unit, n represents a positive integer of at least 50, and each of Q represents a monovalent substituent selected in the group   consisting of hydrogen, halogens, hydrogen radicals,   carbon containing no tertiary carbon atoms alpha, halogenated hydrocarbon radicals having at least 2 carbon atoms between the halogen atom and the phenyl ring, oxyhydrocarbon radicals and halogenated oxyhydrocarbon radicals having at least two carbon atoms between atom of halogen and the phenyl nucleus.   28. Composition according to claim 27, characterized in that in the poly (oxyphenylene) resin (a) (i), each of the radicals Q represents an alkyl group having from 1 to 4 atoms. of carbon.   29. Composition according to claim 28, characterized in that in the poly (oxyphenylene (a) (i) resin each   groups Q represents a methyl group.   Self-extinguishing composition according to claim 26, characterized in that the hydrogenated radial diblock copolymer comprises from 1 to 45 parts by weight of vinyl aromatic compound and from 99 to 55 parts by weight of saturated rubber, and a relatively small amount of a coupling agent, per 100 parts by weight of multidose copolymer hydrogenated radial.   31. Self-extinguishing composition according to claim 30, characterized in that in the hydrogenated radial diamequence copolymer, the coupling agent is a chosen polymer.   in the group consisting of polyepoxides, polyiso-   cyanates, polyimines, polyaldehyls, polyketones,   polyanhydrides, polyesters and polyhalides.   Self-extinguishing composition according to claim 1, characterized in that, in the hydrogenated radial diblock copolymer, the vinyl aromatic compound is styrene, the saturated catouchouc has terminal sequences derived from styrene, and the coupling agent is selected from the group   consisting of epoxidized polybutadiene, SiCl4 and their   ges. 33. Composition according to claim 26, characterized in   the aromatic phosphate (b) used as a flame retardant giant answers the formula: O 3 He 1I R 30 -P-OR   OR2 i 2 3 wherein R, R and R are the same or different and are alkyl, cycloalkyl, aryl, aryl groups substituted by alkyl, alkyl groups substituted by   aryl groups, hydrogen halogens and some   combination of them, provided that at least one   radicals R1, R2, R3 represents an aryl group.   34. Composition according to claim 33, characterized   in that the aromatic phosphate is triphenyl phosphate.   Self-extinguishing composition according to claim 26, characterized in that the low molecular weight polystyrene is present in an amount of from about 1 to about 10 parts by weight per 100 parts by weight of the total composition.   36. Self-extinguishing composition according to claim 26, characterized in that the polystyrene of low molar mass is present in an amount of between about 1 and about 5 parts by weight per 100 parts by weight of the total composition.   37. Composition according to claim 26, characterized   in that it comprises an effective amount of feedstock forcing fiberglass.