DE2216213A1 - Reinforced foamable thermoplastic compositions and methods of making them - Google Patents

Description

Dr. F. Zumsteln sen. - Dr. E. Assmann Dr. R. Koenlgsberger - Dlpl.-Rhys. R. Holzbauer - Dr. F. Zumstetn Jun.

PATENT LAWYERS

TELEPHONE: COLLECTIVE NO. 225341

TELEX 529979

TELEGRAMS: ZUMPAT CHECK ACCOUNT: MUNICH 91139

BANK ACCOUNT: BANKHAUS H. AUFHÄUSER

8 MUNICH 2,

BRÄUHAUSSTRASSE 4 / II1

XC / MA

CASE: 1219-M 450

DART. INDUSTRIES IHC.
Los Angeles, California 90054-, USA

"Reinforced foamable thermoplastic compositions and methods of making them"

The invention relates to reinforced foamable thermoplastic compositions and methods of making them and use.

So far, plastic manufacturers have made foamed, fiber-reinforced thermoplastic products using special procedures. The process consists in inserting reinforcing fibers in an extruder into the incorporates thermoplastic resin and at the same time introduces a foaming agent into the melt directly before extrusion. When the product obtained is extruded, it is foamed at the same time. This procedure makes it necessary

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so that the entire incorporation of the foaming agent in the reinforced resin is carried out by the plastics manufacturer and results in these special devices must have available for introducing the foaming agent; As a result, plastics manufacturers and suppliers have developed fiber reinforced thermoplastic resin compositions which are latently foamable and which are used by the plastics processor can be used, eliminating the need for special devices of those described above Kind of providing is avoided. Compositions of this type have been prepared by first having the reinforcing fibers are incorporated into the thermoplastic resin in such a way that reinforced resin beads or pellets are obtained obtained, whereupon these pellets are immersed in a liquid foaming agent for relatively long periods of time. A procedure of this type is described in US Pat. No. 5,484,048. The resulting composition has a latent foamability and can easily be used by the plastics processor can be processed by this only the composition under the usual temperature conditions which the foaming agent is activated, extruded or deformed. Although these compositions are for the plastics processor Allow considerable advantages, there are disadvantages for the manufacturer of the composition in that the immersion stage is time consuming and difficult to control, particularly the amount of resin incorporated into the dag Concerning foaming agent, whereby on the other hand, the uniformity of the products is impaired.

It is therefore an object of the invention to provide fiber-reinforced thermoplastic resin compositions which have a latent Have foamability to provide, with which the above-mentioned disadvantages can be overcome and with conventional extrusion and injection molding devices can be processed. The compositions contain briefly

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said a mixture of

1) a first component comprising a thermoplastic resin containing the reinforcing lasers and

2) a second component comprising a thermoplastic resin containing a foaming agent.

Each component of the compositions is produced separately. and then to form the compositions of the invention combined with the other in the form of a physical mixture. Thus, the compositions manufactured without the need to use time consuming immersion processes, and still using the Advantages of the latent foamable compositions achieved. It is also used in the manufacture of each Ingredients mixing processes used achieve tight control of the process as well as the final composition.

The fiber reinforced thermoplastic resin component the composition can suitably be prepared thereby be that a thermoplastic resin is mixed with reinforcing fibers, whereupon the mixture is extruded and forming particles, granules or pellets which are suitable for subsequent use in molding processes or Extrusion processes are suitable, comminuted. Hereinafter such particles, granules, pellets, etc. as materials., in Denotes lump or particle form, it being understood that these terms include all of the above Shapes are intended to include, An example of such a method is disclosed generally in U.S. Patent 3 453 536. In this general procedure, mixing can be done in the dry state prior to introduction into an extrusion device take place or can be achieved thereby that one introduces the individual components separately one after the other or simultaneously into the device.

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Mixing and processing of these materials using these procedures are preferably carried out in Controlled in a known manner in order to keep unnecessary mechanical abrasion of the Pasern as small as possible and for the Reinforcement to achieve the minimum fiber length required in the final composition. In general, the after Reinforced components obtained from these procedures are referred to as "short fiber" products because the majority of the fibers is generally shorter than the length of the individual pieces of the composition. Fiber lengths of this type lie usually in a range of about 0.0254 to about 0.0762 cm (0.01 to 0.03 inches).

A preferred method of the type described above is to place the materials in the hopper the extrusion device dry mixed and the mixture under such conditions by at least one strand-forming Orifice extruded that at least a substantial portion of the fibers along the extrusion axis by flowing is oriented. The extruded strand is then cooled to solidify the resin, whereupon the strand in substantially transverse direction is cut to give relatively short pieces in which the fibers are generally parallel to each other and generally parallel to the axis mentioned above. The fibers in each piece should have a minimum length of about 0.0127 cm (0.005 inches) in order to provide a reinforcing effect and the fibers can reach a length of up to that of the bit itself. The pieces are of such a size that that they are used in the subsequent deformation-extrusion stages in the manufacture of the final particles For example, sizes from about 0.158 cm to about 3.81 cm (1/16 "to 1 1/2"), preferably 0.317 cm to about 2.54 cm (1/8 inch to 1 inch), it being understood that these lengths are nominal.

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Another method of making those reinforced with cords Ingredients in which the products obtained are referred to as "long fiber" products can also be used be used. The length of the majority of the lasers in these "long fiber" products are generally above that Length of the majority of the pasers of the "short fiber" products and generally extend the entire length of the bits themselves. This alternative method is to that one passes endless filaments through a bath of molten resin, whereby the filaments with the desired amount of resin are impregnated. This system is not dissimilar to a common method of wrapping wire. Vfenn the endless filaments are impregnated, they are continuously removed from the bath and cooled so that the molten one Resin solidifies, whereupon the material is essentially transverse to form the short pieces Direction is cut. These bits are similar to the bits of the "short fiber" products described above in that the fibers extend substantially parallel to one another and substantially parallel to the axis that the materials are removed from the bath, are aligned. However, unlike the "Short fiber" products are the fibers of the "long fiber" products substantially the entire length from one cut side of the piece to the other cut Page. In turn, the sizes of the "long fiber" product pieces can range from about 0.158 inches to about 3.81 cm (1/16 inch to 1 1/2 inch), preferably from 0.307 cm to 2.54 cm (1/8 inch to 1 inch). An alternative method of this type is described in US Pat. No. 3,042,570.

It will also be understood that instead of using a bath of molten resin in the above process the filaments also with a resin suspension or emulsion

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can impregnate sion and then * apply enough heat, to dry and melt the resin around the filaments. One method of this type is in U.S. Patent 2,877,501.

For both products, i.e. the "short fiber" products as the "long fiber" products can also have the cross-sections in Depending on different factors vary considerably. The "short fiber" products made by extrusion of Strands are formed, the dimension of the cross section depends on the size of the extrusion opening. Both "Long fiber" products made by impregnation endless Filaments are formed, the dimension of the cross section depends on, the total number of filaments that are impregnated and are combined and the amount of resin from. Of course, certain processing conditions result practical limits on the dimensions of the cross-sections of these pieces. It turned out that / is particularly suitable is to form chips having nominal cross-sectional dimensions ranging from about 0.158 cm to about 0.635 cm (1/16 inch to about 1/4 inch).

It can generally be used in the manufacture of thermoplastic resins the reinforced resin components can be used. These resins include polyolefins, particularly polyethylene, Polypropylene and copolymers of ethylene and propylene, polystyrene, styrene / acrylonitrile polymers, ABS polymers (Acrylonitrile / polybutadiene / styrene polymers), nylon, polyphenylene oxides, polyphenylene oxide / polystyrene mixtures, Polyacetals, polysulfones, polycarbonates, polyurethanes, cellulose esters, polyesters, such as polyethylene terephthalate, polymonochlorostyrene, Acrylic polymers, polyvinyl chlorides, polyvinylidene chlorides, copolymers of vinyl chloride and Vinylidene chloride, various thermoplastic elastomers such as those based on styrene and butadiene or ethylene

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and propylene and mixtures of the above resins.

The reinforcing fibers can be fibers that lead to reinforcement and include natural or fibers of synthetic origin provided that their properties are such that they are among those used in formation the compositions according to the invention and the subsequent processing steps retain their shape intact. The fibers are preferably made of glass or asbestos. Suitable glass fibers are in the form of roving and commercially available in cut form. Preferably these glass fibers are treated with glue to get a better one Bond between the resin and the glass. These adhesives include polyvinyl acetate, various silane compounds and the like, to name a few.

In general, the reinforced resin component 5 may to 70 wt -. ° / o, preferably 10 to 55 wt .- ^, contain reinforcing fibers.

In addition to the thermoplastic resin and the reinforcing fibers, the reinforced resin component can also be various other additives such as dyes, pigments, stabilizers, antioxidants, talc, molybdenum disulfide, Teflon particles, Lubricants, glidants, anti-caking agents, dispersing aids, Plasticizers, metal flakes and the like.

The composition of the foaming agent / thermoplastic resin ingredient depends essentially on the particular thermoplastic resin of the fiber reinforced resin component away. Particular attention must be paid to the foaming agent be, which must have a decomposition time that the flowability time of the resin of the resin reinforced with fibers

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in part at the particular processing temperature, the temperature being above the melting point of the last-mentioned resin and the decomposition point of the Foaming agent lies. The decomposition time is the length of time during which the foaming agent decomposes essentially completely will. The pourability time is the length of time in which the resin becomes essentially completely flowable. Flowable means that the resin is softened sufficiently under the action of heat and pressure that it will flow and has no permanent self-sustaining porm. Thus, with other words, the foaming agent must, if the compositions according to the invention are processed, with a temperature necessarily above the melting point of the resin of the resin component reinforced with the fibers is required, a sufficiently low rate of decomposition is required at this temperature, so that it is at the time at which the above-mentioned resin substantially is completely flowable, is not completely decomposed. Although the above is the outer limits of the essential decomposition properties of the foaming agent which is suitable according to the invention, it often is it is preferred to use a foaming agent which has a decomposition temperature higher than the softening point and below the decomposition point of the resin of the resin component reinforced with the fibers.

From the above it can be seen that a large number of foaming agents or mixtures of foaming agents can be used according to the invention can be used, the selection of a particular foaming agent on the decomposition point of this Material and depends on the particular thermoplastic resin of the resin component reinforced with fiber. That The foaming agents or the foaming agents can be selected from the usual foaming agents which are commercially available provided that the above-mentioned special requirements

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requirements are met. These materials are p-toluenesulfonylsemicarbazide, azobisformamide, azobisisobutyronitrile, diazoaminobenzene, trihydrazinotriazine, Ii, IT ¹ -Diroethyl-NjN'-dinitrosoterephthalamide, Ν, ΙΤ'-dinitrosopentamethylene-sulfonyl-4, 3'-dinitrosopentamethylene-sulfidrazone, -sulfidrazone, -sulfidrazone-, -sulfidrazol-3,3hydrazidsulfidrazo-3,3hydrazid-3,3hydrazol-3,3hydrazol-3,3-hydrazol-3-hydrazol-3-hydrazine-sulfonitrile, diazoaminobenzene, diazoaminobenzene, diazoaminobenzene, , ρ, ρ'-Oxy-bis- (benzenesulfonylhydrazi.d) and Celogen BH. Suitable foaming agents are described in Modern Plastics Encyclopedia, 1970-71, Vol.47, No.10A, pages 254-256.

The thermoplastic resin used in the preparation of the foaming agent / thermoplastic resin component must be a resin which can be rendered flowable at a temperature below the decomposition point of the foaming agent or foaming agents used. Preferably, the thermoplastic resin must v made flowable at a temperature of this component can ground /, which is about 11 to 27.5 ⁰ C (20 to 5O ⁰ P) below the decomposition temperature of the foaming agent without a too early taking place activation, for example, decomposition is dispersed and incorporated into the resin with evolution of a gas. Although the component of the foaming agent and the resin is preferably to some extent compatible with the resin of the fiber reinforced resin component, it is not necessary for the present invention to have such compatibility.

From the above, it can be seen that a variety of thermoplastic resins are used in the foaming agent / resin ingredient can be used, the particular choice of material being the particular The foaming agent used and the particular resin used in the fiber reinforced resin component. The following table shows some typical examples

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Suitable resins and foaming agents which can be used in combination according to the invention are indicated.

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TABLE I.

Thermoplastic resin des
resin reinforced with piping
constituent Foaming agent Resin component ι (Polycarbonate)
()
(Polypropylene)
() -
(Nylon)
(Polyethylene ™)
(Polyethylene terephthalate) Foaming agent Thermoplastic resin (Polystyrene)
()
(ABS polymer)
() -
(SAN)
()
(Polyphenylenoxycl · - }
(polystyrene blends j
() (Trlhydrazinotriazln)
(p-Toluenesulfonyl-Semlcarbazid)
(Azodicarbonamide)
- (N, N ♦ -Dinitrosopentamethylene-) -
(tetramln ·)
(Dlphenylsulfon-3,3 '«dlsulfo-)
(nyl-hydrazld) (Polyethylene ² )
(Polyisobutylene)
( Copolymers from Propy-)
- (len and isobutylene or mi-)
(polypropylene)
(and polyisobutylene) Polyphenylenoxycl (p-Toluolsulfonylsemlcarbazld)
(Azodicarbonamide)
(ρ, ρ'-Oxyblstrihydrazino-tri-)
- (azine with destabilizers5) -
(Azobisisobutyronitrll)
(Diazoamine benzene)
(NjN'-Dlmethyl-NjN'-dinitroso-)
(terephthalamld)
(Toluene »(* O-sulfonylhydrazide) (Thermoplastic styrene)
(Butadiene block mixed poly)
(merisat rubbers3; Polysulfone
Polycarbonates Trihydrazine notriazine Polystyrene nylon Trihydraalnotriazine ABS polymer Trihydrazinotriazine (Polyethylene ^)
(Polyethylene ⁴ )
"(SAN)
(Nylon)

REMARKS:

1 - high density, 0.941 and higher (ASTM D1248).

2 - low density, 0.925 and lower (ASTM D1248).

3 - relatively new thermoplastic rubbers that have both

• have rubber-like and thermoplastic properties. For example are the materials Rubber-like under room conditions, but become fluid when heated. The melt r-y / solidification cycle is reversible. Although it is believed that the structure of these polymers consists of three blocks Styrene-butadiene-styrene is made up, this has not been established and the method according to which these materials are used The materials are commercially available under the name Kraton and are in Modem Plastics Encyclopedia, 1970-71, Vol. 47, No. 10A, pages 217-218 and 785.

4 - medium density, 0.926-0.940, (ASTM D1248JL

- Metal salts, e.g. zinc, cadmium or barium salts, the

are known for .that they are vinyl chloride polymers stabilize.

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The foaming agent / resin component of the composition _{according to the invention can be prepared by extrusion compounding s} ¥ mixing with a Banbury mixer or by another similar process in which the resin with the foaming agent under sufficiently low temperature conditions that do not cause decomposition of the foaming agent ⁰ Jo ₁ preferably 15 to 30 wt .- ^, may be incorporated - will make resin flowable homogenized ,, in general, the foaming agent may be used in an amount of 10 to 50 wt.. The compounded mixture may be comminuted into flakes, granules, pellets, and the like, hereinafter referred to as "chunks" or "particles", provided that these terms encompass the same shapes as used for the various shapes of the above described first component are given. Preferably, the dimensions of the bits of the foaming agent / resin component are substantially the same as the bits of the fiber reinforced resin component so that the two components can be easily compounded, as described below, without segregation or separation.

The compositions of the invention are obtained by mixing 85 to 99 wt, - $, preferably 90 to 98 wt ~ $ of the fiber-reinforced resin component with 1 to 15 wt .- $, preferably from 2 to 10 ° ß> of the foaming agent / resin. Component physically mixed, for example with a drum mixer. As indicated above, the particle dimensions of each component are preferably substantially the same so that segregation or separation does not occur during physical mixing. This essentially leads to a relatively good distribution of the two constituents, which is particularly desirable directly prior to processing in extrusion or injection molding devices to give shaped parts.

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When processing the compositions according to the invention the mixture is only normally added to the hopper of an extrusion or injection molding facility introduced. The mixture is then mixed in the usual way under temperature conditions in which not only both resins melt and become flowable, but also the decomposition of the foaming agent occurs, passed through the device and.processed. Of course, the usual mixing of the ingredients is achieved during this time so that the entire Mass is substantially homogenized. Effect upon extrusion or injection molding to form an article the gases released by the decomposition of the foaming agent, so that the resin is foamed. During the In the peeling process, the pasern tend to stand out in general to orient tangentially to the bladder walls, whereby the bladder walls are reinforced. This leads quite generally also results in a statistical orientation of the fibers through the entire mass and results in a larger one Strength uniformity in all directions. However, the molded articles are relatively smooth non-porous surface with a foamed inner core.

It can be seen from the above description that, according to the invention, thermoplastic compositions reinforced with fibers are obtained which are latently foamable and which can be produced without the difficulties of the previously known processes, since no immersion technique is required and which additionally with conventional extrusion and injection molding devices can be processed, without substantial changes in the equipment required are _s for example, in a spray forming device a simple turn-off nozzle between the main body of the device and of the mold is needed to avoid loss of material between the individual injection processes. In the case of an extrusion device, a similar

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before modification can be used, although not required must be to make a change when the apparatus is operated in a continuous manner. However are opposite to the parts obtained by injection molding, the extruded parts on the surface as also porous inside.

The following examples are intended to explain the invention further without, however, restricting it.

Example. 1 Making the first component;

A mixture of about 80 parts by weight polystyrene and about 20 parts by weight of chopped glass fibers (nominal length of 0.635 cm (1/4 inch) below the Hamen OCi ¹⁸⁸⁵ available from Osens-Corning Fiberglas) are vorgemißcht in dry state and in introduced an extrusion unit. The mixture is passed through the extrusion device, whereby the glass fibers are uniformly dispersed in the resin melt, whereupon the mixture is exfered into strands, which are then cooled and cut into pellets.

Manufacture of the second component:

A mixture of about 80 parts by weight of a thermoplastic elastomeric styrene / butadiene copolymer (obtained from SHELL under the name Kraton 3125) and about 20 parts by weight of p-toluenesulfonyl semicarbazide are premixed and fed into an extruder, which at Temperatures in the range from 138 to 16O ⁰ G (280 to 32O ⁰ P) is operated, temperatures below the decomposition

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temperature of the foaming agent. The foaming agent was uniformly dispersed in the thermoplastic elastomer, whereupon the mixture was extruded into strands which were cooled and cut into pellets.

Manufacture and deformation of the composition;

The composition of the invention is then prepared by dry blending about 14 parts by weight of the first ingredient (resin reinforced with fibers) and about 1 part by weight of the second component (resin containing the foaming agent) manufactured. This mixture is latently foamable and can be stored as it is or can be used directly be sent to a plastics processor, where they are ultimately in a similar V / eise as a non-foamable resin is processed into extruded or injection-molded parts.

In order to explain the ease of processing, the composition described above is introduced into a screw injection molding device which is provided with a nozzle which can be switched off. The composition is processed at a temperature in the range from 232 ⁰ C to 260 ⁰ C (450 to 500 ⁰ P) in the machine, whereby the decomposition of the foaming agent and the development of gases takes place, resulting in a foamable glass fiber-containing melt of polystyrene and the thermoplastic styfol / butadiene elastomers. It was found that under these processing conditions the p-toluenesulfonyl semicarbazide had completely degraded in the course of about 1 minute, while the corresponding polystyrene had become flowable in less than about 10 seconds. Part of the foamable melt is injected in an amount sufficient / to partially fill the cavity of the mold, while at the same time foaming takes place and continues until the mold is filled, where-

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is achieved by molding the molded foamed article. As can be seen, the degree of foaming can be controlled to some extent by the amount of foamable melt introduced into the mold cavity, since foaming then stops when the mold is filled and the conditions equalize, ^w ? As a result of solidification of the melt, the degree of foaming that has occurred is "frozen"; of course, the degree of foaming is also directly dependent on the amount of foaming agent present in the overall composition.

Example 2 First component

A mixture of about 70 parts by weight of polyethylene terephthalate and about 30 parts by weight of glass fibers (chopped glass fibers nominally 0.635 cm (1/4 inch) in length) are combined in a Extruder mixed, extruded into strands and cut into pellets.

Z further component

A mixture of about 80 parts by weight of medium JHohte polyethylene (density 0.926, melt index 9.0) and 20 parts by weight p-Foliiolsulfonylsemicarbazid are "in an extruder at at a temperature below the decomposition point of the foaming agent. The mixture is extruded to severity, which are cut au pelleta with approximately the same dimensions as the first component.

2 Π Γ) R UUI 1 0 5 8

Composition according to the invention

The composition according to the invention is then dry-coated Mix about 95 parts of the first component and about 5 parts by weight of the second ingredient. The composition exhibits latent acidity on and can be stored.

It has been found that the composition (to 510 ⁰ P 405), the foaming agent is substantially completely decomposed over about 1 Hinute during processing in the spray deflection means at processing temperatures in the range 207-266 ⁰ C, while the polyethylene terephthalate in ' had flowed for less than 30 seconds. A molded article having good cell uniformity and physical properties was obtained.

Example 3

Another composition according to the invention, which was prepared in a manner similar to that described in Example 2, comprises 3 parts by weight of a first component on; ~ Poly (monochlor3tyrol) -Ilarz that 56 parts by weight of glass fibers reinforced with about 20 and 5 weight "parts of a second loading v, band te ils from Onea thermoplastic elastoaeren '. tyrol / -Bu Uulien Hischpolynerisat (Kraton 3125), which contains 20 wt .- ^ p-toluene semicarbazide. When this composition was processed using an injection molding machine at temperatures in the range of 207 to 266 C (405 to 31O ⁰ P), α I showed that the foaming agent had essentially completely decomposed in the course of 1 minute while there _; j Poly-monochlorostyrene) had become flowable in less than about Ί0 seconds.

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Example 4

According to the procedures described in Example 2, another composition according to the invention was prepared, the 90 parts by weight of a first component of a polypropylene resin reinforced with 20% by weight, -3 & glass fibers and 10 parts by weight of a second component of 90% by weight Polypropylene / polyisobutylene-I solution (50/50), 5% by weight of p-toluenesulfonyl semicarbazide and 5% by weight of azodicarbonamide. When this composition was processed using an injection molding machine at temperatures in the range of 193 to 221 ⁰ O (380 to 430 ' ⁰ F), it was found that the foaming agents had substantially decomposed over a period of about 1 minute. while the polypropylene had flowed in less than about 30 seconds.

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ORIGINAL INSPECTED

Claims (10)

PATENT CLAIMS: 1 Reinforced foamable thermoplastic compositions, - characterized in that they (A) a first component made of a thermoplastic resin containing reinforcing fibers, and (B) a second component made of a thermoplastic resin containing a foaming agent, the foaming agent has a decomposition time which is greater than the time for the resin to flow Component (A) at a temperature above the melting point of the resin of component (A) and the decomposition point of the foaming agent is, wherein the resin (B) is at a temperature below the decomposition point of the foaming agent is flowable, contain. 2. Composition according to claim 1, characterized in that the first ingredient 85 to 99 wt .- # of the Composition and the second ingredient 1 to 15% by weight make up the composition. 3. Composition according to claim 2, characterized in that the first component 5 to 70 wt .- 5 $ reinforcing Contains Pasern. 20984A / 1058 4. ^% ■ Composition according to claim 2, characterized in that the second component contains 10 to 50% by weight foaming agent, 5. Composition according to claim 1, characterized in that that the first and second ingredients are in particulate form and the compositions are physical Are mixtures of such particulate ingredients. 6. Composition according to claim 1, characterized in that that the foaming agent has a decomposition temperature higher than the softening point and lower than the decomposition point of the resin (A) lies « 7. Composition according to claim 1 _9, characterized in that the reinforcing! Fibers of component (A) are glass fibers and I. the thermoplastic resin of component (A) polycarbonate, Polypropylene, polyethylene, urylon or polyethylene terephthalate, the foaming agent of component (B) trihydrazinotriazine, p-toluenesulfonylsemicarbazide «, Azodicarbonamide, NjN'-dinitrosopentamethylene tetramine or diphenylsulfone-3,3'-disulfonylhydrazide and that thermoplastic resin of component (B) polyethylene, polyisobutylene, a propylene / isobutylene copolymer, Is polypropylene or a mixture of polypropylene and polyisobutylene, or II. The thermoplastic resin of component (A) polystyrene, ABS (an acrylonitrile / butadiene / styrene copolymer), a styrene / acrylonitrile copolymer or a mixture of polyphenylene oxide and polystyrene, the foaming agent of component (B) p-Toluenesulfonylseiaicarbazid, Azodicarbonamid, p, p ^e -Oxybistrihydrazinotriazine, 209844/1058 Azobisisobutyronitrile, diazoaminobenzene, Ιί, Ν'-diniethyl- NiN'-dinitrosoterephthalamide or toluene- (4) -sulfonylhydrazide and the thermoplastic resin of component (B) is a thermoplastic s'tyrene / butadiene block copolymer rubber, or III. the thermoplastic resin of component (A) polyphenylene oxide, the foaming agent of component (B) trihydrazinotriazine and the thermoplastic resin des Component (B) is polystyrene, IV. The thermoplastic resin of component (A) Polysulfone or polycarbonate, the foaming agent of component (B) trihydrazinotriazine and the thermoplastic Resin of component (B) is acrylonitrile / butadiene / styrene copolymer, V. the thermoplastic resin of component (A) nylon, the foaming agent of component (B) trihydrazinotriazine, the thermoplastic resin of component (B) is styrene / acrylonitrile copolymer or nylon or VI. the thermoplastic resin of component (A) poly (monochlorostyrene), the foaming agent of the component (B) p-toluene semicarbazide and the thermoplastic resin of component (B) is a thermoplastic styrene / butadiene block copolymer rubber. 8. A process for the production of reinforced foamable thermoplastic compositions, characterized in that that he (A) reinforcing fibers incorporated into a thermoplastic resin * the fiber reinforced thermoplastic resin to form a first component Particles crushed, 2098-4 / 1058 (B) incorporating a foaming agent into a thermoplastic resin and the thermoplastic resin containing the foaming agent to form a second component comminuted into particles, the foaming agent having a decomposition time which is the time up to Flowability of the resin of the first component at a temperature above the melting point of the Resin of the first constituent and the decomposition point of the foaming agent, the Resin of the second component at a temperature below the decomposition point of the foaming agent is flowable, and (C) the particulate first component with the particulate second component blended to form the reinforced foamable thermoplastic compositions. 9. A method for producing reinforced foamed thermoplastic articles, characterized in that man (A) incorporating reinforcing fibers into a thermoplastic resin and the fiber reinforced thermoplastic resin to form a first component Particles crushed, (B) incorporating a foaming agent into a thermoplastic resin and the foaming agent-containing thermoplastic Resin converted into particulate form to form a second component, the foaming agent being a Has decomposition time, which is the time it takes for the resin of the first component to flow at a Temperature above the melting point of the resin of the first component and the decomposition point of the Foaming agent is exceeded, the resin of the 209844/1058 - 21 - second component at a temperature below the The decomposition point of the foaming agent is flowable and (C) the particulate first component with the particulate second component blended and mixed to form the foamable thermoplastic compositions (D) introducing the composition (C) into an extruder and extruding a shaped article, while at the same time the foaming agent is activated. 10. A method for producing reinforced foamed thermoplastic articles, characterized in that that he . (A) Reinforcing fibers in thermoplastic resin and the thermoplastic reinforced with the fibers Resin is converted into particulate form with the formation of a first component, (B) incorporating a foaming agent into a thermoplastic resin and the thermoplastic containing the foaming agent Resin is particulate to form a second component, the foaming agent has a decomposition time which is the time it takes for the resin of the first component to flow at a temperature which is above the melting point of the resin oil of the first component and the decomposition point of the foaming agent, the Resin of the second component flowable at a temperature below the decomposition point of the foaming agent is and (C) the particulate first component with the particulate second component blended and mixed to form the reinforced foamable compositions 2098A4 / 10S8 (D) the composition (G) in an injection molding machine introduces and injection molding a molded article while at the same time the foaming agent is activated. 209844/1058