JPH0794572B2 - Process for treating a mixture of halogenated and non-halogenated polymers to obtain a stabilized thermoplastic polymer composition and composition thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method of treating a mixture of halogenated and non-halogenated polymers in suitable thermoplastic processing equipment and the compositions obtained by said method. The halogenated component is subjected to controlled thermal degradation to produce a stabilized thermoplastic polymer composition that can be used. No halogen-containing volatiles are generated as a result of the method. This method is based on the Banbury mixe
r), twin-screw extruder, single-screw extruder, etc.

[0002]

2. Description of the Related Art Such a method has already been disclosed in US Pat.
Known from specification 861. According to this, PP /
A composition consisting of PVdC (polypropylene / polyvinylidene chloride) scrap + hydrated lime [Ca (OH) ₂ ] and a metal carboxylate salt is subjected to a densification process, where the temperature is lowered below the melting point of the polymer by the addition of water. ~ 56 ℃ (20 ~ 100
Hold down to 0 ° F). The reaction is said to occur during this densification process, which lasts 5 to 15 minutes. This reaction differs from the present invention in many respects. First, the present invention requires a temperature above the melting temperature of the polymer in order for the reaction to take place.

The present invention specifically requires the use of metal oxides or metal-aliphatic carboxylates, whereas the process of the above-referenced US patent requires the use of hydrated lime. This hydrated lime is not the same as calcium oxide which is an example of a metal oxide.

Yet another difference is that the patent requires the addition of water in an amount of 5 to 25% by weight in order to keep the reaction temperature below the melting point of the polymer.
No water or other solvent is added in the present invention.

As a conventional method, Japanese Patent Publication No. 51-3750 and Japanese Patent Laid-Open No. 53
No. -21277 and JP-A-56-122894 are known, and in these cases, waste plastic is pyrolyzed so that it can be used as fuel later. The patents refer to reacting waste plastics in the presence of calcium compounds, including calcium oxide, calcium hydroxide, or calcium carbonate. The purpose of adding the calcium compound is to react with the HCl or other toxic gas produced. However, to those patents, the present invention apparently relates to recovering a usable thermoplastic composition from a mixture of halogenated and non-halogenated polymers. Halogenated and non-halogenated polymers may be waste materials.

The process of the present invention comprises a controlled thermal degradation step which produces a stabilized halogenated polymer component in the presence of a specified amount of metal oxide or metal aliphatic carboxylate. , Giving the result of recovering a material suitable for reuse.

[0007]

Accordingly, one object of the present invention is to enable the recovery of available stabilized thermoplastic polymer compositions from a mixture of halogenated and non-halogenated polymers. Is to give way.

Another object of the present invention is the stabilization available from halogenated and non-halogenated polymers, mixtures of those polymers in which one or both of the polymers are derived from waste materials. It is to provide a method that makes it possible to recover the thermoplastic polymer composition.

Yet another object of the present invention is to provide a method for recovering the available stabilized thermoplastic polymer composition from a mixture of halogenated and non-halogenated polymers, in any conventional manner. It is to provide a method that can be used in a physical processing device.

Yet another object of the present invention is to treat the corrosion of processing equipment in a manner that allows recovery of the available stabilized thermoplastic polymer composition from a mixture of halogenated and non-halogenated polymers. Is to give a way to minimize.

[0011]

The present invention provides a stabilized thermoplastic polymer composition usable from a mixture of at least one halogenated polymer and at least one non-halogenated thermoplastic polymer. Non-solvent method for recovery,
It relates to a non-solvent method of subjecting the halogenated polymer to controlled thermal degradation without substantially degrading the non-halogenated thermoplastic polymer to produce a reusable stabilized thermoplastic polymer composition. The mixture may be in the form of, for example, a laminated film, a coated bottle, etc. and is first formed into a form that can be processed by means known in the art such as shredding, granulating or agglomerating.

The polymer mixture is then combined with at least one metal oxide or metal aliphatic carboxylate salt,
A metal halide salt is obtained. This metal halide salt is stable under the conditions necessary for treating and using the thermoplastic polymer composition obtained according to the present invention. The metal oxide or metal aliphatic carboxylate is used in an amount that is at least the stoichiometric equivalent required to react with all the halogens contained in the mixture. The amount of metal oxide or metal aliphatic carboxylate is at least 1.0 to about 3.the stoichiometric amount required to prevent the release of all halogens in the polymer mixture.
It is preferably in the range of 0 times. If insufficient metal oxides or metal aliphatic carboxylates are added, halogens in the polymer mixture will be released which will cause processor corrosion.

Metal oxides or metal aliphatic carboxylates cause problems during the processing of the polymer mixture and / or
The thermoplastic polymer composition obtained should not be used in amounts which would cause problems in utilizing it. A mixture of metal oxides, a mixture of metal aliphatic carboxylates, or a mixture of metal oxides and metal aliphatic carboxylates can be used.

The polymer mixture is melted with a mixture of the polymer mixture and a metal oxide or a metal aliphatic carboxylate,
Subject to elevated temperature conditions such that the halogenated polymer is thermally degraded to generate halogen acid gas. The halogen acid gas reacts with the metal oxide and / or the metal aliphatic carboxylate. The mixture of polymer mixture and metal oxide or metal aliphatic carboxylate salt may be mixed by any means known to those skilled in the art. Furthermore, it is not important whether the polymer mixture and the metal oxide / metal aliphatic carboxylate mixture are premixed before being subjected to the elevated temperature conditions. The following are examples of known methods for accomplishing the reaction.

Preferably, the polymer mixture and the metal oxide /
Suitable for use in processing the mixture with the metal aliphatic carboxylate salt is a Banbury mixer, extruder, two roll mill, or any other equipment used in the industry. The polymer mixture and the metal oxide / metal aliphatic carboxylic acid salt should be premixed as long as the metal oxide / metal aliphatic carboxylic acid salt is supplied before the halogenated polymer is generated before generating the halogen acid gas. , Or may be supplied independently.

When the polymer mixture is melted and the halogenated polymer is thermally deteriorated, the mixture of the polymer mixture and the metal oxide / metal aliphatic carboxylic acid salt is thermally decomposed to give a metal oxide / metal aliphatic carboxylic acid. Heat to a temperature that releases a halogen acid gas that reacts with the salt. The temperatures used to treat the polymer mixture with the metal oxide / metal aliphatic carboxylate reactant will depend on the components used in the reaction. However, the temperature should not be so high as to decompose the metal oxide or metal aliphatic carboxylate or significantly decompose the non-halogenated polymer. When a metal-aliphatic carboxylate salt is used, the resulting stabilized thermoplastic polymer composition containing the reaction product is then prepared in a conventional manner, such as by molding, pelletizing, granulating, etc. to recover. However, when using a metal oxide,
Water is generated during the reaction. The generated water is removed or trapped by a suitable method. For example, water may be trapped by using an amount of metal oxide in excess of that required for the reaction. Alternatively, the water may be removed by vacuum extraction or any other method that can be readily applied to remove the water. Once the water has been removed or trapped, the resulting stabilized thermoplastic polymer composition containing the reaction product is then recovered using conventional means.

Polymers suitable for use in the present invention are as follows: The halogenated polymer may be any halogenated polymer, but the halogen is preferably chlorine. In particular, polyvinyl chloride and polyvinylidene chloride copolymers are most suitable for use in the present invention.

Halogen-free non-halogenated polymers suitable for use in the present invention include any halogen which does not thermally degrade before substantial thermal degradation of the halogenated polymer in the mixture occurs. It may be a polymer not containing it. In particular, polyolefins such as polyethylene and polypropylene; styrenes such as polystyrene; and olefin copolymers such as a copolymer of ethylene and vinyl acetate; styrene copolymers; are used as non-halogenated polymers. Is preferred.

Any metal oxide can be used in the method of the present invention so long as it produces a stable metal halide salt.
It is preferably selected from the group consisting of magnesium and zinc. Furthermore, calcium is preferred. When a metal aliphatic carboxylate that produces a stable metal halide salt is used, the metal is sodium, potassium, calcium, zinc, magnesium, aluminum,
It is preferably selected from the group consisting of tin and barium. Preferably the fatty acid carboxylate salt comprises a chain having 2 to 30 carbon atoms, more preferably 2 to 20 carbon atoms.

Examples of metal aliphatic carboxylates suitable for use in the present invention include stearates such as calcium or zinc stearates, citrates, tartrates, adipates, abiates, and resins. It is an acid salt.

The stabilized thermoplastic polymer composition resulting from the process may be mixed with any type of additive known in the art. Various additives are incorporated into the polymer composition in order to make the polymer composition suitable for a given purpose. For example, antioxidants, antistatic agents, plasticizers, nucleating agents, impact modifiers, pigments, fillers,
Reinforcing agents, lubricants, processing aids, binders and the like may be mixed with the polymer composition. Examples of materials that perform these desired functions are well known in the art to those of ordinary skill in the art, and are generally commercially available.

The thermoplastic polymer composition resulting from this step may be mixed with other polymer compositions.

The following well known test methods were used to evaluate the physical properties of the polymeric materials obtained from the method of the present invention:

[0024]

The present invention is further illustrated by the following examples.
All parts are by weight. Examples 1 to 4 Examples 1 to 4 of the present application illustrate that different metal oxides are likewise suitable for use in the practice of the invention, and that mixtures of metal oxides can be satisfactorily used. . In carrying out Examples 1-4, the polymer mixture comprised 90% by weight polypropylene and 10% by weight polyvinylidene chloride copolymer, the chlorine content being 50% by weight of the polyvinylidene chloride copolymer. It was The process conditions used to carry out Examples 1-4 were the same.

In particular, Examples 1 to 4 as shown in Table 1 below.
The polymer mixture and the metal oxide used in Example 1 were pre-mixed and then Fisons Instrument
s) manufactured and sold by Haake R
heocord) 90 type mixer. Then premix the metal oxide with the polymer mixture at a mixer speed of 125 rpm at about 200 ° C.
Mix for 8 minutes at the temperature. The obtained thermoplastic polymer was taken out of the mixer. As shown in Table 1, no odor of halogen was shown in any of the examples.

Due to the conditions used to carry out Examples 1 to 4 and the absence of detectable halogen odor, it is concluded that all of the halogen acid generated from the halogenated polymer has reacted with the metal oxide. You can Furthermore, Examples 1-4
There was no odor of halogen detected during treatment.

[0027]

[Table 1] (1) Polypropylene / polyvinylidene chloride copolymer. (2) At least 1.0 required to capture the generated water
Includes molar equivalents of metal oxide.

The following Examples 5 and 6 illustrate the use of a combination of metal oxide and metal aliphatic carboxylate salt to carry out the process of the present invention. Calcium oxide was used as the metal oxide, and zinc stearate was used as the metal aliphatic carboxylate.

Examples 5 and 6 A polymer mixture containing 90% polypropylene and 10% polyvinylidene chloride copolymer having a chlorine content of 50% by weight of the polyvinylidene chloride copolymer is treated. To
Two different concentration level metal oxide / metal aliphatic carboxylate blends were used in Examples 5 and 6. The formulation also contained waste polypropylene film.
The formulations are shown in Table 2 below. To process the formulations of Examples 5 and 6, the ingredients of the formulations were weighed and placed separately in a Banbury mixer.

The batch weight of the formulation was 1100 g and the mixing was carried out at a temperature just above the melting point of the polypropylene, followed by fluidization of the polymer for 1.5 minutes at 2.8 bar (40 psi) pressure. The material was removed from the Banbury mixer, granulated, and then placed in a Dolci single-screw extruder with a 45 mm barrel, where the halogen acid gas was combined with oxides and stearates at temperatures above 190 ° C. Reacted with. The stabilized thermoplastic polymer composition obtained from the extruder showed no halogen odor. Further properties of the polymer obtained in Example 6 are listed in Table 2. In addition, there was no halogen odor detected during the processing of Examples 5 and 6.

[0031]

[Table 2] (1) Polypropylene / polyvinylidene chloride copolymer. (2) It contains about 1.0 molar equivalent of metal oxide necessary to trap the generated water.

The following Examples 7 and 8 illustrate the use of a given metal oxide at two different stoichiometric levels to prevent the generation of halogen acid gas. As illustrated below, both levels of metal oxide have been found to be adequate to prevent the evolution of the resulting halogen acid gas.

Examples 7 and 8 In Examples 7 and 8, a polymer mixture containing 90% polypropylene and 10% polyvinylidene chloride and having a chlorine content of 50% by weight of polyvinylidene chloride was used as waste polypropylene film and It was mixed with calcium oxide in the ratio shown in Table 3. To process the formulation, the ingredients specified in Examples 7 and 8 shown in Table 3 were separately placed in a Banbury mixer. After batching a batch weighing 1100 g into a Banbury mixer and polymerizing at a pressure of 2.8 bar (40 psi) just above the melting temperature of polypropylene,
Mix for 1.5 minutes. The material was removed from the Banbury mixer and granulated.

The granulated material was then passed through a Betol single screw extruder 2520 / with a barrel diameter of 25 mm.
It was placed in a J mold, where calcium oxide was reacted with halogen acid gas at temperatures above 190 ° C. The resulting stabilized thermoplastic polymer composition removed from the extruder showed no halogen odor. Further physical properties of the polymer compositions obtained in Examples 7 and 8 are shown in Table 3 below. No odor of halogen was detected during the process for making the resulting thermoplastic polymer composition.

[0035]

[Table 3] (1) Polypropylene / polyvinylidene chloride copolymer. (2) It contains at least 1.0 molar equivalent of metal oxide necessary to trap the generated water.

The following Example 9 illustrates the method of the present invention carried out on a twin screw extruder. Example 9 In this example, the polymer mixture was 90% polypropylene and 10% polyvinylidene chloride copolymer with a chlorine content of 50% by weight of the polyvinylidene chloride copolymer. . The polymer mixture and calcium oxide were directly charged as separate components into a Werner and Priderel ZSK40 twin screw extruder with a barrel diameter of 40 mm. Extruder is 25 ° C above 220 ° C
It was operated at a screw speed of 0 rpm and a pressure of 14 bar. The stabilized polymer composition obtained from the extruder showed no halogen odor. Further properties of the resulting plastic polymeric material are shown in Table 4 below.

[0037]

[Table 4] (1) Polypropylene / polyvinylidene chloride copolymer. (2) At least 1.0 required to capture the generated water
Includes molar equivalents of metal oxide.

Examples 10-19 Examples 10-19 of the present application are also suitable for use in the practice of this invention with different metal aliphatic carboxylates, and mixtures of metal aliphatic carboxylates are also satisfactory. It illustrates that it can be used. To carry out Examples 10-19, the polymer mixture comprises 90% by weight of polypropylene and 10% by weight of polyvinylidene chloride copolymer, the chlorine content being 50% by weight of the polyvinylidene chloride copolymer. It was something. The processing conditions used to carry out Examples 10-19 were the same. In particular, the polymer mixtures and metal aliphatic carboxylates used in Examples 10-19, as shown in Table 5 below, were premixed and then used in Examples 1-4 in Haake Rheocord 90 type mixers. Introduced to. The polymeric material and the premixed metal aliphatic carboxylic acid salt were then mixed for 5 minutes at a temperature of 210 ° C at a mixer speed of 50 rpm. A glass rod immersed in a 5.0 N (normal) ammonium hydroxide solution during treatment was placed on top of the mixer where the evolved gases escape. No white cloud of ammonium chloride was formed, indicating that no halogen acid was generated. The resulting stabilized thermoplastic polymer composition was recovered from the mixer. From the conditions used to perform Examples 10-19 and the absence of detectable halogen, it is clear that all of the halogen acid generated from the halogenated polymer reacted with the metal aliphatic carboxylate salt. . Furthermore, no halogen was detected during the performance of Examples 10-19.

[0039]

[Table 5]

[0040]

[Table 6] (1) Polypropylene / polyvinylidene chloride copolymer.

The following Examples 20-22 illustrate another way of making granules from the polymer compositions of the present invention and further making injection molded articles from the granules. The examples also illustrate three types of metal aliphatic carboxylates used to react with halogen acid gas.

Examples 20-22 Examples 20-22 include weight percentages containing 90% polypropylene and 10% polyvinylidene chloride copolymer with a chlorine content of 50% by weight of the polyvinylidene chloride copolymer. The coalesced mixture was mixed with various metal aliphatic carboxylates as shown in Table 6. During formulation processing, specified in Examples 20-22,
The ingredients shown in Table 6 were separately placed in a Banbury mixer. A batch weighing 1200 g in each case was introduced into a Banbury mixer and mixed at a pressure of 2.8 bar (40 psi) at a temperature slightly above the melting temperature of polypropylene. Mixing was carried out for 5 to 10 minutes after the polymer was fluidized for Examples 20 and 21, and for 1.5 minutes after the polymer was fluidized for Example 22. The material was removed from the Banbury mixer and granulated.

The granulated material is then fed to a Battenfeld injection molding machine BA30 having a barrel diameter of 30 mm.
Introduced into the 0 CD + form, where the reaction of the halogen acid gas with the metal aliphatic carboxylate was carried out at 230 ° C. The resulting molded test pieces of the polymer produced showed no halogen odor. The physical properties of the polymers obtained in Examples 20-22 are shown in Table 6 below.

[0044]

[Table 7] (1) Polypropylene / polyvinylidene chloride copolymer.

Reexamining the data shown in Tables 1 to 6 above, the stabilized thermoplastic polymer compositions obtained by the process of the present invention show that the melt flow is within the range shown in the examples of the present invention. It will be readily appreciated that the invention is characterized by having physical properties comparable to those of standard commercial grade polypropylene with index (MFI) properties. Compared to standard grade polypropylene, the thermoplastic polymer compositions of the present invention exhibit comparable values for tensile strength, flexural modulus and notched Izod impact strength. Accordingly, the thermoplastic polymer composition of the present invention would be suitable as a starting material for making polymer blends.

While the present invention has been described in relation to that aspect, there are other aspects that fall within the spirit and scope of the invention,
It is to be understood that the invention can be modified, changed and varied without departing from the proper scope of the claims or the correct meaning.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Robert Sidney White House UK Oertee Ranks, Berry, Edenfield, Bolton Road North 90 (56) Reference JP-A-63-3040 (JP, A)

Claims (20)

[Claims] 1. A non-solvent method for recovering a usable stabilized thermoplastic polymer composition from a mixture of at least one halogenated polymer and at least one non-halogenated thermoplastic polymer. A non-solvent method of subjecting the halogenated polymer to controlled thermal degradation without substantially degrading the non-halogenated thermoplastic polymer to produce a stabilized thermoplastic polymer composition, wherein the polymer The mixture is formed into a handleable material and the resulting stabilized mixture is in an amount that is at least a stoichiometric equivalent required to react with the polymer mixture and all the halogens contained in the polymer mixture. At least one metal oxide, which produces a stable metal halide salt under the conditions necessary for treating and using the thermoplastic polymer composition, is combined with said polymer mixture The mixture with the metal oxide was subjected to elevated temperature conditions where the polymer mixture melted and the halogenated polymer was thermally degraded to release a halogen acid gas that reacts with the metal oxide. A non-solvent method comprising removing or scavenging water and collecting the resulting stabilized thermoplastic polymer composition. 2. The method according to claim 1, wherein the halogen of the halogenated polymer is chlorine. 3. The method of claim 1, wherein the metal oxide is selected from the group consisting of calcium oxide, magnesium oxide, and zinc oxide. 4. The method according to claim 3, wherein the metal oxide is calcium oxide. 5. The amount of metal oxide combined with the polymer mixture is at least 1.0 to about 3.0 of the stoichiometric amount required to react with all the halogens in the polymer mixture.
The method according to claim 1, which is in a double range. 6. The method according to claim 1, wherein the water formed is trapped by further adding a metal oxide. 7. A non-solvent method for recovering a usable stabilized thermoplastic polymer composition from a mixture of at least one halogenated polymer and at least one non-halogenated thermoplastic polymer. A non-solvent method of subjecting the halogenated polymer to controlled thermal degradation without substantially degrading the non-halogenated thermoplastic polymer to produce a stabilized thermoplastic polymer composition, wherein the polymer The mixture is formed into a handleable material and the resulting stabilized mixture is in an amount that is at least a stoichiometric equivalent required to react with the polymer mixture and all the halogens contained in the polymer mixture. At least one metal oxide, which produces a stable metal halide salt under the conditions necessary for treating and using the thermoplastic polymer composition, is combined with said polymer mixture The mixture with the metal oxide was subjected to elevated temperature conditions where the polymer mixture melted and the halogenated polymer was thermally degraded to release a halogen acid gas that reacts with the metal oxide. A stabilized thermoplastic polymer composition obtained by a non-solvent method which comprises removing or trapping water and collecting the obtained stabilized thermoplastic polymer composition. 8. A composition according to claim 7, wherein at least one additive is incorporated. 9. An article of manufacture formed from the composition of claim 7 or 8. 10. A non-solvent method for recovering a usable stabilized thermoplastic polymer composition from a mixture of at least one halogenated polymer and at least one non-halogenated thermoplastic polymer. A non-solvent method of subjecting the halogenated polymer to controlled thermal degradation without substantially degrading the non-halogenated thermoplastic polymer to produce a stabilized thermoplastic polymer composition, wherein the polymer The mixture is formed into a handleable material and the resulting stabilized mixture in an amount that is at least a stoichiometric equivalent required to react the polymer mixture with all the halogens contained in the polymer mixture. Combining with at least one metal-aliphatic carboxylic acid salt which yields a stable metal halide salt under the conditions necessary for treating and using the thermoplastic polymer composition, The mixture of the above polymer mixture and the metal aliphatic carboxylate releases a halogen acid gas that reacts with the metal aliphatic carboxylate by melting the polymer mixture and thermally degrading the halogenated polymer. A non-solvent method comprising subjecting to elevated temperature conditions to and collecting the resulting stabilized thermoplastic polymer composition. 11. The method according to claim 10, wherein the halogen of the halogenated polymer is chlorine. 12. The method of claim 10, wherein the metal of the metal aliphatic carboxylate salt is selected from the group consisting of sodium, potassium, calcium, zinc, magnesium, tin, aluminum, and barium. 13. The method of claim 10, wherein the aliphatic carboxylate salt comprises a chain having 2 to 30 carbon atoms. 14. The method of claim 13, wherein the aliphatic carboxylate salt comprises a chain having 2 to 20 carbon atoms. 15. The method of claim 14, wherein the metal aliphatic carboxylate is selected from the group consisting of stearate, citrate, tartrate, adipate, and resinate. 16. The amount of metal aliphatic carboxylate salt combined with the polymer mixture is at least 1.0 to about 3.0 of the stoichiometric amount required to react with all the halogens in the polymer mixture. 11. The method of claim 10 in the double range. 17. A non-solvent method for recovering a usable stabilized thermoplastic polymer composition from a mixture of at least one halogenated polymer and at least one non-halogenated thermoplastic polymer. A non-solvent method of subjecting the halogenated polymer to controlled thermal degradation without substantially degrading the non-halogenated thermoplastic polymer to produce a stabilized thermoplastic polymer composition, wherein the polymer The mixture is formed into a handleable material, and the resulting stabilized mixture is in an amount that is at least a stoichiometric equivalent required to react the polymer mixture with all the halogens contained in the polymer mixture. Combining with at least one metal-aliphatic carboxylic acid salt which yields a stable metal halide salt under the conditions necessary for treating and using the thermoplastic polymer composition; The mixture of the above-mentioned polymer mixture and the metal aliphatic carboxylic acid salt is melted, the polymer mixture is melted, the halogenated polymer is thermally deteriorated, and a halogen acid gas which reacts with the metal aliphatic carboxylic acid salt is released. A stabilized thermoplastic polymer composition obtained by a non-solvent method, which comprises subjecting it to elevated temperature conditions, and collecting the resulting stabilized thermoplastic polymer composition. 18. A composition according to claim 17, wherein at least one additive is incorporated. 19. An article of manufacture formed from the composition of claim 17 or 18. 20. A non-solvent method for recovering a usable stabilized thermoplastic polymer composition from a mixture of at least one halogenated polymer and at least one non-halogenated thermoplastic polymer. A non-solvent method of subjecting the halogenated polymer to controlled thermal degradation without substantially degrading the non-halogenated thermoplastic polymer to produce a stabilized thermoplastic polymer composition, wherein the polymer The mixture is formed into a handleable material, and the resulting stabilized mixture is in an amount that is at least a stoichiometric equivalent required to react the polymer mixture with all the halogens contained in the polymer mixture. At least one metal oxide and at least one metal fat that yields a stable metal halide salt under the conditions necessary to process and use the thermoplastic polymer composition. A carboxylic acid salt, were combined, the mixture of the polymer mixture and the metal oxide and the metal aliphatic carboxylate, the polymer mixture is melted,
The halogenated polymer is thermally deteriorated to release a halogen acid gas that reacts with the metal oxide and the metal aliphatic carboxylate, and is subjected to an elevated temperature condition to remove or trap the generated water, and A non-solvent method comprising collecting the resulting stabilized thermoplastic polymer composition.