WO2020091708A2

WO2020091708A2 - New compositions having inner and outer lubricant properties for plastics

Info

Publication number: WO2020091708A2
Application number: PCT/TR2019/050685
Authority: WO
Inventors: Semih Durmus; Tughan AKBASAK; Ceren ERDEM
Original assignee: Ak-Kim Kimya Sanayi Ve Ticaret Anonim Sirketi
Priority date: 2018-11-01
Filing date: 2019-08-15
Publication date: 2020-05-07
Also published as: TR201816394A2; WO2020091708A3

Abstract

The present invention relates to a lubricant composition for use in shaping plastics. Said lubricant composition is in combination with isodecyl stearate as the first component and it comprises ester mixture obtained by means of esterification of adipic acid, penta-erythritol and oleic acid or oleic acid and linoleic acid mixture as the second component.

Description

NEW COMPOSITIONS HAVING INNER AND OUTER LUBRICANT PROPERTIES FOR

PLASTICS

TECHNICAL FIELD

The present invention relates to new lubricant compositions with increased performance and having inner and outer lubricant characteristics for use in plastic sector, particularly in PVC applications.

KNOWN STATE OF THE ART

Like all polymers, PVC comprises long-chained molecules. These are substantially viscose in melt form and are inclined to adhere to the metal components of processing equipment. By using lubricants, this problem can be overcome. The basic function of the lubricants in rigid PVC (rPVC) and in other polymers is to reduce inner and outer friction. Thus, advantages like easiness in flow at lower temperatures, decrease in the dissolving inclination of the polymer, increase in the production proportion, decrease in the abrasion of equipment and lower energy consumption are obtained.

Lubricants are generally classified as inner or outer lubricants. The dissolvability of the lubricant is in general determined by the molecular structure and the polarity of the polymer. Because of the fragmenting risk of the polymer between the lubricant and the polymer, a complete dissolvability is not desired. In the two types, even if the lubricant is mixed with the PVC polymer, it shows different functions. However, most of the lubricants have combinations with both outer and inner sliding characteristics.

Outer lubricants do not dissolve substantially in PVC. They are migrated onto the polymer surface in melt form and they show outer sliding property on the metal surface of the process equipment. In this case, the bonding force between the polymer and the lubricant is weak. The lubricant substance covers the metal surface of the processing equipment and decreases the friction of the surface and provides outer sliding.

Inner lubricants mostly dissolve in PVC. During the process, they operate in a molecularly included manner to the movement of PVC chains and they function as inner lubricant. The desired effect for an inner lubricant is to provide that the polymer chains shall arrange themselves in a manner providing guiding towards the flow direction. Thus, the sliding tension between the polymer molecules is decreased by the inner lubricant, and thus, the melt viscosity and increase in temperature are reduced.

Since operating commercial-scale equipment has substantially high-cost, in the beginning, their effects of a new developed lubricant system on the rPVC compound are measured by using laboratory-scale equipment like rheometers, dynamic two-rollered mills, small-scale moulding machines and extruders.

Whether a material is an inner lubricant or an outer lubricant depends on the joinability of the material with rPVC, the adhesion durations and the effects on melt viscosity. The inner lubricants do not substantially affect the adhesion durations, however, they decrease melt viscosity. The outer lubricants affect the adhesion durations; however, they do not substantially decrease the melt viscosity. These characteristics can be measured by a torque rheometer and in dynamic two cylinder mill. rPVC can be processed in various equipment like extruders (both single and double screwed), calendering machines and injection molding machines.

The lubricant system must be balanced in terms of the processing and final usage characteristic requirements. While the single-screw extruders need inner and outer lubricant balance, the double-screw extruders, calenders and injection moulders need more outer lubricants. The lubricant systems are not only balanced for the processing equipment, and at the same time, the lubricants affect the required final usage characteristics in a favorable manner. A formulation which is completely optimized provides high output amount, low waste proportions, high quality finished products and the required physical characteristics. Insufficient or excessive amount of lubricant leads to decrease of the processing efficiency or even stop processing. A balanced lubricant system (with the correct amounts of both the inner and the outer lubricants) provides control on the thermal stability durations, output proportion, blooming, transparency and physical characteristics.

Although there are lubricant classes at a substantially wide range for rPVC, most of them are considered as wax or soap. The five main chemical classes are as follows: amides, hydro carbon waxes, oil acid esters, oil acids and metallic soaps.

There are pluralities of types of ester lubricants used in various rPVC formulations: simple esters, glycerol esters, poly-glycerol esters, montan esters, partial esters of the multi functional alcohols, completely esterified esters of multi-functional alcohols. These esters are made of various alcohols and oil acids except montan esters. These lubricants are generally named as oil acid esters. Esters are generally versatile and their characteristics can change as inner or outer lubricant as a result of increasing carbon chain length and esterification degree. Therefore, the sliding characteristics of an ester can be adapted for specific applications.

In the known state of the art, there are documents which describe various lubricant mixtures. In the application with number US 95,286 which is one of them, a lubricant system for PVC applications is disclosed. In said lubricant system, a lubricant system is described which has pluralities of components and comprising ester and/or oil acid-oil alcohol ester and an ester mixture and/or another ester and optionally metal soap. In order to obtain the desired characteristics by means of said lubricant system, each component must be carefully selected and the determination of the optimum amounts for each component needs a complex preparation step.

The mono-esters of high saturated oil acids are colorless, odorless and crystallized solids. These are among the esters which have the strongest inner lubricant function. The most frequent glycerol is mono-stearate (GMS). GMS has some“outer” characteristics and it is mostly an “inner” lubricant. The increase of the esterification degree increases the outer sliding characteristic.

The most frequent oil acid used as a lubricant for rPVC is the mixture of palmitic (chain length with 16 carbons) and stearic (chain length with 18 carbons) acids. Besides some inner lubricant characteristics, these are one each good outer lubricants at the same time. The greatest disadvantages are that their volatilities are low.

As processing of rPVC becomes more complex and as proportions increase and as the parts become more complex, having good inner and outer characteristics and having good balanced lubricant system become more critical. This condition necessitates the mixture of lubricants which have essentially two or more inner and outer lubricant characteristics. As an example to these, paraffin / oxidized polyethylene / calcium stearate, oxidized polyethylene / oil acid ester, oil acid ester mixture, paraffin / amide, etc. can be given.

Particularly in production of PVC films by means of calendering process, there is the problem of adhesion of the hot form film to the mechanical parts and to the cylinders. This condition leads to physical deformations on the film and the product cannot be produced with the desired quality. When only the isotridecyl stearate product, known with abbreviation G-40 and which shows inner lubricant characteristic, is used, even if this problem is eleviated, it is not completely eliminated, and it affects the visual and physical performance of the final product.

For instance, in the document with number US2009/163634 A1 , transparent, amorphous and micro-crystalline poliamide, copoliamide and polyamide mixtures, having improved scratching resistance, are described. Particularly among the preferred lubricants, isotridecyl stearate (Loxiol G-40 ®) is also provided.

When isotridecyl stearate is used, even if the inner lubricant characteristics are sufficient, while the processed product is removed from the mould, when passing through the screw or through the cooling cylinders particularly for film products, adhesion and thus deformation problems may be observed in the final product and plate-out problem may also occur. The inner lubricant characteristic is insufficient in a stand-alone manner at this point.

As a result, because of all of the abovementioned problems and because of the insufficiency of the present solutions about the subject, an improvement is required in the related technical field.

BRIEF DESCRIPTION OF THE INVENTION

The present invention relates to a suitable lubricant composition for plastic, particularly for PVC applications, for meeting the above mentioned requirements and for eliminating the above mentioned disadvantages and for bringing new advantages to the related technical field.

The main object of the present invention is to provide a lubricant composition which shows both inner lubricant and outer lubricant characteristic.

Another object of the present invention is to provide a lubricant composition which reduces the friction on the surface of the processing equipment and which has mould separation characteristic.

Another object of the present invention is to provide a lubricant composition which eliminates the adhesion problem. Another object of the present invention is to provide a lubricant composition which provides reaching of improved torque values.

A similar object of the present invention is to provide a lubricant composition which provides reaching of lower power (ampere) values and higher gloss values for the extruder.

Another object of the present invention is to provide a lubricant composition where the film can pass in the cooling cylinders without adhering and where deformation is prevented in the final product and which provides obtaining of high quality products.

Another object of the present invention is to provide a lubricant composition which provides obtaining production efficiency.

Another object of the present invention is to provide a lubricant composition which provides prevention of separate usage of more than one additive substance.

In order to realize all of the abovementioned objects, the subject matter is a lubricant composition for use in shaping plastics; said lubricant composition is in combination with isodecyl stearate as the first component and it comprises ester mixture obtained by means of esterification of adipic acid, penta-erythritol and oleic acid or oleic acid and linoleic acid mixture as the second component.

The present invention is moreover a method for producing lubricant composition for use as lubricant in shaping plastics; said method comprises the steps of:

i- obtaining isodecyl stearate as the first component;

ii- obtaining ester mixture obtained from esterification of adipic acid, penta-erythritol and oleic acid or oleic acid and linoleic acid mixture as the second component and; iii- adding said first component to the second component at determined proportions.

The present invention is moreover a method for producing lubricant composition for use as lubricant in shaping plastics; said method comprises the steps of obtaining isodecyl stearate by means of esterification of stearic acid and isodecyl alcohol ; and afterwards, adding the mixture of penta-erythritol and oleic acid or oleic acid and linoleic acid mixture to the reaction medium.

The present invention moreover describes a plastic product and said plastic product comprises a lubricant composition comprises ester mixture obtained by means of esterification of adipic acid, penta-erythritol and oleic acid or oleic acid and linoleic acid mixture in the form of combination with isodecyl stearate.

The structural and characteristic properties and all advantages of the present invention will be understood in a more clear manner by means of the below mentioned detailed description and evaluation shall be made by taking into consideration the below mentioned detailed description.

DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the preferred embodiments of the subject matter lubricant compositions are explained with references to examples without forming any restrictive effect only in order to make the subject more understandable.

The present invention describes a new lubricant composition with increased performance for plastic applications, particularly for poly-vinyl chloride (PVC) applications. The subject matter lubricant composition comprises two components, namely, a first component and a second component:

1 . Component: Stearic acid and ester of isodecyl alcohol and

2. Component: Ester mixtures of adipic acid, penta-erythritol and oleic acid or oleic acid and linoleic acid mixture

In the present application, the lubricant means an additive substance which reduces friction between polymer-polymer, metal-metal, polymer-metal, filler-filler or polymer-filler.

In an unexpected manner, when the subject matter combination of 1 ^st Component and 2^nd Component is used, it has been found that it provides outer lubricant characteristic and mould separation characteristic which covers the metal surface of the equipment and which reduces the friction on the surface thereof and that the adhesion problem is eliminated when compared with the case where only the 1 ^st Component is used. By means of this, lower torque values are reached, lower power (ampere) values are reached and higher gloss values are reached. Thanks to the present invention, the film can pass without adhering to the cooling cylinders and the deformation problem is eliminated in the final product and high quality products can be obtained. Because of the decreasing torque and because of loading more material to the system, production efficiency can be obtained. Additionally, a synergistic increase has been determined in the product output in unit time. Moreover, thanks to the present invention, the separate usage of more than one additive substance is prevented. Thanks to this, an important advantage is provided in the subjects like logistic, storage, purchasing and in terms of cost and labor and time. According to the present invention, the first component comprises isodecyl stearate obtained from stearic acid and isodecyl alcohol. The structure of isodecyl stearate is shown by Formula I below.

Formula I

The second component according to the present invention comprises ester mixtures obtained from i) adipic acid, ii) penta-erythritol and iii) oleic acid or oleic acid and linoleic acid mixture. In other words, the second component comprises complex esters formed by penta- erythritol adipatoleate/oleate and linoleate mixture. As used in the present application, the penta-erythritol adipatoleate/oleate and linoleate mixture complex esters mean ester mixtures obtained from i) adipic acid, ii) penta-erythritol and iii) oleic acid or oleic acid and linoleic acid mixture. The formulas of the compounds (i, ii-oleic acid when present and iii) forming these esters are shown below.

Penta-erythritol Oleic Acid Adipic Acid

Formula II Formula Formula III

The weight proportions of the first and second components of the subject matter lubricant composition bear importance for said composition to have the desired characteristics. When the proportion of complex esters of penta-erythritol adipatoleate/oleate and linoleate mixture of the subject matter composition exceeds 30% by weight of the total mixture, the chemical structure of the mixture and the technical characteristics of the final product are affected in an unfavorable manner.

In a preferred embodiment of the present invention, the lubricant composition comprises complex esters of 70% or more isodecyl stearate and 30% or less penta-erythritol adipatoleate/oleate and linoleate mixture complex esters by weight totally.

In a further preferred embodiment of the present invention, the lubricant composition comprises isodecyl stearate between 70% and 90% by weight and complex esters of penta- erythritol adipatoleate/oleate and linoleate mixture between 10% and 30% by weight totally.

The targeted acid number of the subject matter lubricant composition is smaller than 1 mgKOH/g. When the total weight proportion of complex esters of penta-erythritol adipatoleate and linoleate complex esters exceeds 30%, the acid number is over the targeted value.

In another preferred embodiment of the present invention, the lubricant composition comprises the ester mixture obtained by means of esterification of adipic acid, penta- erythritol and oleic acid as the second component and in combination with the iso-decyl- stearate as the first component; wherein the total weight proportion of the first component is between 70% and 90%, the total weight proportion of the second component is between 10% and 30% and the acid number of said composition is 1 mg KOH/g or lower.

In the present application, “acid number” means the mass of potassium hydroxide in milligrams which is required for neutralizing one gram of chemical substance. The acid number gives the amount of carboxylic acid groups in the solution.

In the present application,“hydroxyl number” means the mass of potassium hydroxide in milligrams which is required for neutralizing acetic acid taken during acetylation of one gram of chemical substance comprising free hydroxyl groups.

Component (A) according to the present invention can be obtained by means of realization of esterification methods known as isodecyl stearate. For instance, stearic acid is esterified with stearic acid isodecyl alcohol in the presence of acid as catalyst. The beginning substances can be used in different mole proportions. For instance, the proportion of stearic acichisodecyl alcohol can be 1 :1 .07 for obtaining products having the desired characteristics. When the proportion of isodecyl alcohol is lower than 1 .07, the reaction is not completed. When isodecyl alcohol is added over 1 .07, problems are faced in removing excessive alcohol and the hydroxyl number is greater than desired.

The preferred hydroxyl number for isodecyl stearate according to the invention is smaller than 5 mgKOH/g and the acid number is smaller than 1 mgKOH/g.

In the isodecyl stearate solution obtained according to the invention, preferably there is essentially no free carboxyl and/or hydroxyl group.

The adipic acid:penta-erythritol:oleic acid/oleic and linoleic acid mixture used as the beginning substance in the complex esters of penta-erythritol adipaoleate/oleate and linoleate mixture as the second component may change. For instance, the preferred proportion for obtaining products having the desired characteristics is 0.78:1 :2.22.

Moreover, penta-erythritol can be fixed according to the product with the desired viscosity and the proportion of adipic acid:oleic acid/oleic and linoleic acid mixture can be changed. The other preferred proportions can be 0.85:1 :2.12, 0.5:1 :2.48, 0.74:1 :2.25, 0.8:1 :2.20. The difference in the proportions directly influences the viscosity of said second component. The desired viscosity value is optimized by changing said mole proportions.

When oleic acid is used as mono-carboxylic acid, the preferred adipic acid:oleic acid proportion is 0.78:2.22, 0.5:2.48, 0.74:2.25, 0.85:2.20. The preferred adipic acid:penta- erythritol :oleic acid proportion is 0.35:0.45:1 .

The preferred hydroxyl number for the complex esters of penta-erythritol adipate- oleate/oleate and linoleate mixture according to the present invention is smaller than 20 mgKOH/g and the acid number is smaller than 15 mgKOH/g.

In the complex ester mixture of penta-erythritol adipate stearate/oleate complex ester mixture obtained according to the invention, there is essentially no free hydroxyl group.

According to the present invention, the complex esters of penta-erythritol adipaoleate and linoleate mixture as the second component can be obtained by realizing the esterification methods known in the literature. For instance, oleic acid/oleic acid and linoleic acid mixture is esterified by means of penta-erythritol and partial ester is obtained. In the obtained product, there is one or more free hydroxyl group. Afterwards, said free hydroxyl groups are reacted with adipic acid. According to another method, first of all, a part of the hydroxyl groups of penta erythritol is esterified with adipic acid, and afterwards, the remaining free hydroxyl groups of the obtained ester are reacted with oleic acid/oleic acid and linoleic acid mixture.

In order to obtain complex ester mixture of penta-erythritol adipate-oleate and linoleate, the beginning substances can be used at different mole proportions.

In another preferred embodiment of the present invention, the complex esters of the mixture of penta-erythritol adipat-oleate and linoleate are obtained by means of esterification of oleic acid/oleic acid and linoleic acid mixture and afterwards, the obtained product is esterified with adipic acid and thereby, two-step esterification is applied.

In another preferred embodiment of the present invention, the complex esters of penta- erythritol adipate-oleate/oleate and linoleate mixture are obtained by means of single-step esterification of the beginning substances.

In the literature, it is observed that the esterification reactions are essentially realized between 200-210°C and in very long durations. The syntheses of complex esters of isodecyl stearate and penta-erythritol adipaoleate which are synthesized within the scope of the present invention have been realized at much lower temperatures (135°C and 170°C) and in shorter durations (10 hours and 7 hours). The type and amount of catalyst used in the reaction can change the duration and temperature of the reaction. In order for the reaction to reach balance in short duration, essentially sulphuric acid and hydro-chloric acid are used among the strong anorganic acids. P-toluene sulphonic acid, which provides balance in a rapid manner and in the best manner according to the invention, has been preferred as the catalyst.

The subject matter lubricant composition is obtained by means of adding penta-erythritol adipate-oleate/oleate and linoleate mixture to the isodecyl stearate product as the first component at determined proportions. Moreover, in the present invention, the mixtures of the first and second components can be prepared chemically in the reaction medium instead of physically mixing thereof. In case the subject matter lubricant composition is prepared in this manner, for instance, at the continuation of isodecyl stearate synthesis in the first step, the mixture of penta-erythritol and oleic acid or oleic acid and linoleic acid can be added to the medium at the continuation of isodecyl stearate synthesis in the first step. The subject matter lubricant compositions obtained at different proportions can be added to plastic, for instance, hard or soft PVC mixtures at changing proportions. Therefore, the first component and the second component must be mixable with each other at desired proportions when they are in melt form. Thus, homogeneous mixtures can be obtained. The subject matter lubricant compositions are used by means of adding said lubricant compositions to the plastic material, which is to be processed, prior to processing. The amount of lubricant composition to be added depends on the plastic material and process type. Preferably said plastic product comprises lubricant composition with proportion between 0.2% and 0.6% by weight totally.

At the same time, if the user finds that the lubricant values are greater than the values desired to be obtained, he/she may decrease the amount of the related mixture in the final product in a controlled manner, and he/she can reach better lubricant effect and better visual quality by means of this amount when compared with the lubricant effect and visual quality obtained by means of single product.

Window profiles, automobile seat leathers, floor coatings, wallpapers, shoe bases, electric cables and various packages can be given as example to the PVC products where the subject matter lubricant composition will be used.

Thanks to the subject matter lubricant composition, for instance, the duration of staying of the PVC material in the mould is reduced. This provides the PVC material to be subjected to high temperature for a shorter duration inside the system. Thus, the thermal degradation proportion of PVC is reduced more and the lifetime is longer when compared with the system applied beforehand. At the same time, thanks to the increasing outer lubricant characteristic, the damaging risk of the equipment is minimized and the usage lifetime is extended.

Particularly the reduction in the thermal degradation of PVC provides a favorable contribution to the light fastness of the final product. For instance, if the final product is a window profile, the window profile stays for longer time without yellowing. When the material is subjected to less temperature for a shorter duration while the material is being produced, the thermal and mechanical resistance of the final product is greater.

Since the lubricant characteristic is improved, the equipment like extruder screw and extruder shell have higher resistance and extruder screw cleaning is needed with less frequency. After the lubricant composition is dispensed in plastic in a homogeneous manner, shaping can be realized by means of the methods known in the literature.

EXAMPLES

The preparation of isodecyl stearate (A) obtained from isodecyl alcohol and stearic acid compliant to the present invention and the preparation of ester mixtures (B) obtained from adipic acid, penta-erythritol and oleic acid and the preparation of the subject matter combinations thereof are described by means of the examples below.

Example 1

The synthesis of isodecyl stearate ester (1^st Component):

1 mole of (284.5 g) stearic acid and 1 .07 mole of (158.3 g) isodecyl alcohol and 0.19 grams of PTSA (para-toluene sulphonic acid) has been added to a balloon of 1 liter having a nitrogen inlet, a mechanic stirrer inlet, a thermometer inlet and vacuum outlet. The temperature has been adjusted to 140°C. After the reaction duration of approximately 10 hours, the acid number has been checked. Vacuum has been applied after the acid number reduced under 1 mg KOH/g and the excessive part of the alcohol has been removed under vacuum for 4 hours. The reaction medium has been cooled to 30°C. The medium is neutralized by means of 48% NaOH and deionized water. In order to remove the water which has remained inside the product, the reactor has been heated to 100°C and vacuum has been applied approximately for 2 hours. The medium is cooled and isodecyl stearate product has been obtained.

For the obtained product, the acid number is 0.21 mg KOH/g, soaping number is 141 mg KOH/g, viscosity is 19.2 mPa.s, density is 0.857 g/cm³.

Example 2

The synthesis of penta-erythritol adipat-oleate complex ester (2^nd Component):

2.12 mole of (599 g) oleic acid and 1 mole of (136.15 g) penta-erythritol and 0.645 g PTSA as catalyst have been added to a balloon of 1 liter having a nitrogen inlet, a mechanic stirrer inlet, a thermometer inlet and vacuum outlet. The temperature has been adjusted to 170°C. Vacuum has been applied slightly for removing the formed water. The reaction has been continued in this manner until the acid number has decreased under 1 mg KOH/g. Afterwards, the vacuum has been cut and the temperature has been reduced under 150°C. 0.85 moles of (124 g) adipic acid and 0.22 grams of PTSA have been added to the medium. The temperature has been again adjusted to 170°C and the water formed during the reaction has been removed from the medium by means of applying slight vacuum. When the acid number decreases under 12 mg KOH/g, the reaction has been completed and the medium is cooled and penta-erythritol adipate-oleate complex ester viscose product has been obtained.

For the obtained product; soaping number: 277 mg KOH/g, viscosity: 3000 mPa.s.

Refractive index is 1.4764, density is 0.9968 g/cm³.

Example 3

Preparation of the mixture

Specific proportions of penta-erythritol adipate-oleate have been added to the obtained isodecyl stearate product. The lubricant effect of the mixture obtained at different proportions has been measured in laboratory-scale extruder. The products have been added to the prepared standard PVC mixture as mentioned below and the obtained data has been presented in the table:

As can also be seen in the table, the subject matter mixture has given better results in an unexpected manner when compared with the case where the product has not been used in any condition or when compared with the case where only isodecyl stearate has been used.

Moreover, it has been observed that the lubricant characteristic and the output increase by means of lower torque. The results indicate that the used power (ampere) decreases as the lubricant effect increases. Thus, it has been found that the subject matter combination provides an additional electrical and financial advantage.

Besides all these advantages, it has been seen that the gloss level of the final products with number 3, 4 and 5 comprising the subject matter combination has increased between 3-6 units. This provides an advantage on the final product base.

As a result of the studies made, the mixtures comprising the subject matter combination provide a better technical and final product performance at all proportions sinergically.

Claims

1. A lubricant composition for use in shaping plastics, wherein said lubricant composition is in combination with isodecyl stearate as the first component and it comprises ester mixture obtained by means of esterification of adipic acid, penta- erythritol and oleic acid or oleic acid and linoleic acid mixture as the second component.

2. The lubricant composition according to claim 1 , wherein the total weight proportion of the first component is between 70% and 90% and the total weight proportion of the second component is between 10% and 30%.

3. The lubricant composition according to claim 1 or 2, wherein the acid number of said composition is 1 mg KOH/g or lower.

4. The lubricant composition according to any one of the claims between claim 1 and 3, wherein the acid number of the isodecyl stearate of said first component is 1 mg KOH/g or lower.

5. The lubricant composition according to any one of the claims between claim 1 and 4, wherein the hydroxyl number of isodecyl stearate of said first component is 5 mg KOH/g or lower.

6. The lubricant composition according to any one of the claims between claim 1 and 5, wherein said first component is obtained by means of esterification of isodecyl stearate, stearic acid and isodecyl alcohol with the presence of an acid catalyst, wherein the mole proportion of stearic acid: isodecyl alcohol is 1 :1 .07.

7. The lubricant composition according to any one of the claims between claim 1 and 6, wherein the acid number of said second component ester mixture is 15 mg KOH/g or lower.

8. The lubricant composition according to any one of the claims between claim 1 and 7, wherein the hydroxyl number of the ester mixture of said second component is 20 mg KOH/g or lower.

9. The lubricant composition according to any one of the preceding claims, wherein the mole proportion of adipic acid:penta-erythritol:oleic acid/oleic acid and linoleic acid mixture mole proportion is selected from 0.78:1 :2.22, 0.85:1 :2.12, 0.5:1 :2.48, 0.74:1 :2.25, 0.8:1 :2.20.

10. The lubricant composition according to claim 9, wherein the mole proportion of adipic acid : penta-erythritol : oleic acid / oleic acid and linoleic acid mixture is between 0.78:1 :2.22.

11. The lubricant composition according to any one of the preceding claims, wherein said second component is the ester mixture obtained from esterification of adipic acid, penta-erythritol and oleic acid.

12. A method for producing lubricant composition for use as lubricant in shaping plastics; said method comprises the steps of:

i- obtaining isodecyl stearate as the first component;

13. A method according to claim 1 1 , wherein said second component is the ester mixture obtained from esterification of adipic acid, penta-erythritol and oleic acid.

14. A method for producing lubricant composition for use as lubricant in shaping plastics; said method comprises the steps of obtaining isodecyl stearate by means of esterification of stearic acid and isodecyl alcohol; and afterwards, adding the mixture of penta-erythritol and oleic acid or oleic acid and linoleic acid mixture to the reaction medium.

15. A method according to claim 14, wherein said method comprises the step of adding oleic acid to the reaction medium.

16. A plastic product comprising lubricant composition, wherein said lubricant composition comprises ester mixture obtained by means of esterification of adipic acid, penta-erythritol and oleic acid or oleic acid and linoleic acid mixture in combination with isodecyl stearate.

17. A plastic product according to claim 16, wherein said plastic product comprises lubricant composition with proportion of 0.2% and 0.6% by weight totally.

18. A plastic product according to claim 16 or 17, wherein said plastic product is PVC product.