JP3495277B2 - Thermoplastic elastomer composition for powder slush molding and powder slush molding material - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a thermoplastic elastomer composition for powder slush molding and a powder slush molding material. More specifically, it has excellent powder fluidity, low melt viscosity, and easy demolding of the skin after molding. And a thermoplastic elastomer composition suitable for powder slush molding having excellent tensile strength and a powder slush molding material.

[0002]

2. Description of the Related Art As a powder molding method using a soft powder material, a powder slush molding method using a soft vinyl chloride resin powder is an instrument panel, a console box,
Widely used in the skin of automobile interior parts such as door trim. This is because it has a soft feel, can be provided with leather textures and stitches, and has good designability such as a large degree of freedom in design.

Unlike other molding methods such as injection molding and compression molding, this molding method does not apply a shaping pressure. Therefore, in order to uniformly attach the powder material to a mold having a complicated shape, the powder material is powdered. Since it has excellent fluidity and the powder adhered to the mold melts and flows even under no pressure to form a film, it is also a condition that the melt viscosity is low. Further, it has been necessary to cool the mold and release the molded skin easily from the mold.

As one method for improving this, Japanese Patent Application Laid-Open No. 7-82433 discloses a polypropylene resin and a specific styrene thermoplastic elastomer in a weight ratio of 70/3.
It has been proposed to mix and mix the mixture in a ratio of 0 to 30/70 before use. Here, the styrene-based thermoplastic elastomer is styrene having a styrene content of 20% by weight or less.
Ethylene butylene / styrene block copolymer, styrene / ethylene propylene / styrene block copolymer having a styrene content of 20% by weight or less, and styrene content of 20
The composition is selected from hydrogenated styrene-butadiene rubber in an amount of not more than 5% by weight, and has a good compatibility with polypropylene resin and is suitable for powder molding.

[0005]

However, even in this composition, when the polypropylene resin and the hydrogenated styrene-butadiene rubber are mixed, the hydrogenated styrene-butadiene rubber is finely dispersed in the polypropylene resin. Is suitable. However, since the hydrogenated styrene-butadiene rubber is inferior in oil absorption ability, there is a drawback that the oligomer component in the composition migrates to the surface and has tackiness. For this reason, since the thermoplastic elastomer powder pulverized for powder slush molding also has adhesiveness, it is easy to block and the powder fluidity is deteriorated. Also, when the epidermis is released from the mold, the releasability may deteriorate.

The present invention solves these problems and has excellent melt flowability required for powder molding, particularly powder slush molding, low melt viscosity, and easy demolding of the skin after molding. It is an object to provide a thermoplastic elastomer composition suitable for powder slush molding having excellent tensile strength and a powder slush molding material.

[0007]

That is, according to the invention of claim 1 of the present application, it is a powdery thermoplastic elastomer composition used for powder slush molding, and is at least polypropylene resin, hydrogenated styrene butadiene random copolymer rubber. , Process oil, ethylene-octene copolymer with long-chain branched structure, acid-modified polypropylene as adhesion improver
Propylene, hydroxyl group-containing polypropylene, both ends water acid Motosui
Element-added polybutadiene, and ethylene / vinyl acetate
At least one selected from polymer hydrolysates
~ 20 wt% and dimethylsiloxa as internal mold release agent
Methyl, methyl hydroxypolysiloxane, and methyl
At least one selected from phenyl polysiloxane
A thermoplastic elastomer composition for powder slush molding containing 0.1 to 5.0% by weight .

According to the second aspect of the present invention, a powdery thermoplastic elastomer composition used for powder slush molding is provided, which comprises at least polypropylene resin, hydrogenated styrene butadiene random copolymer rubber, process oil, long chain branched structure. Ethylene-octene copolymer having
Organic peroxide , acid-modified polypropylene as adhesion improver
And hydroxyl group-containing polypropylene, hydroxylated at both ends
Polybutadiene, and ethylene-vinyl acetate copolymer
2-20 at least one selected from the hydrolyzate of
% By weight, and dimethylsiloxane as an internal release agent,
Cyl hydroxypolysiloxane, and methyl phenyl
0.1 at least one selected from
In a thermoplastic elastomer composition for powder slush molding containing ~ 5.0 wt%, the main chain of the polypropylene resin is cut in the process of kneading the organic peroxide under heating to lower the molecular weight of the polypropylene resin. The melt fluidity is increased, and the obtained thermoplastic elastomer powder has high melt fluidity. Further, melt fluidity is improved by allowing process oil to absorb oil as a softening agent in an elastomer component containing hydrogenated styrene-butadiene random copolymer rubber and ethylene / octene copolymer having a long chain branch structure. It will have melt flowability.

According to the invention of claim 3 of the present application, the JIS
250 ° C, 0.325kgf according to K-7210
The thermoplastic elastomer composition for powder slush molding has a melt flow rate (MFR) of the thermoplastic elastomer composition measured by load of 5 g / 10 minutes or more.

According to a fourth aspect of the present invention, there is provided a thermoplastic elastomer composition for powder slush molding, wherein the polypropylene resin and the hydrogenated styrene butadiene random copolymer rubber have a weight ratio of 80/20 to 20/80.

In the invention according to claim 5 of the present application, the ethylene / octene copolymer having a long-chain branched structure is contained in an amount of 20 to 250 parts by weight based on 100 parts by weight of the hydrogenated styrene-butadiene random copolymer rubber. > A thermoplastic elastomer composition for powder slush molding.

In the invention according to claim 6 of the present application, the thermoplastic elastomer composition for powder slush molding contains the process oil in an amount of 5 to 200 parts by weight based on 100 parts by weight of the ethylene-octene copolymer having a long-chain branched structure. It is in.

[0013]

[0014]

In the invention according to claim 7 of the present application, polypropylene resin, hydrogenated styrene-butadiene random copolymer rubber, process oil, ethylene-octene copolymer having a long-chain branched structure, and an acid-modified polypropene as an adhesion improver.
Pyrene, polypropylene with hydroxyl group, hydroxyl groups at both ends
Polybutadiene added, and ethylene vinyl acetate
2 to at least one selected from the hydrolyzate of limer
20% by weight, and dimethylsiloxa as an internal release agent
Methyl, methyl hydroxypolysiloxane, and methyl
At least one selected from phenyl polysiloxane
A thermoplastic elastomer composition containing 0.1 to 5.0% by weight is mixed under heating to form pellets, and the pellets are powdered to obtain a powder slush molding material.

In the invention according to claim 8 of the present application, polypropylene resin, hydrogenated styrene-butadiene random copolymer rubber, process oil, ethylene / octene copolymer having a long-chain branched structure, organic peroxide, and adhesion improver age
Acid-modified polypropylene, hydroxyl group-containing polypropylene,
Hydrogenated polybutadiene with hydroxyl groups at both ends, and ethylene
・ Small amount selected from hydrolyzate of vinyl acetate copolymer
2 to 20% by weight of at least one kind, and di
Methyl siloxane, methyl hydroxy polysiloxa
And methylphenylpolysiloxane
Thermoplastic containing at least 0.1 to 5.0% by weight
Of the elastomeric composition by heating and mixing to form pellets.
In the powder slush molding material obtained by pulverizing the pellets .

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The polypropylene resin used in the present invention may be either a polypropylene homopolymer or a block or random copolymer with an α-olefin, but particularly a block or random copolymer using ethylene as an α-olefin. Polymers are preferred from the viewpoint of flexibility of the molded product. Further, in order to use for powder slush molding without applying pressure, it is 230 ° according to JIS K7210 as an index of melt fluidity of polypropylene resin.
It is necessary that the MFR (melt flow rate) measured with a load of 2.16 kgf at C is 20 g / 10 minutes or more. The polypropylene resin is a polymer whose main chain is cleaved by heat or oxidation, and has a property different from that of polyethylene which is crosslinked and hardened, and its main chain is cleaved by an organic peroxide, and the molecular weight is reduced.

Further, hydrogenated styrene butadiene random copolymer rubber (H-SBR) has excellent compatibility with polypropylene resin, and when it is kneaded with polypropylene resin, it becomes flexible, and is a thermoplastic elastomer composition which is difficult to bend or whiten. The thing is obtained. The styrene content of H-SBR is preferably 30% by weight or less, and 5 to 15% by weight is suitable for obtaining a highly flexible skin. H-SBR differs from SEBS, which is a block copolymer, in that styrene-butadiene rubber in which styrene and butadiene are randomly copolymerized is hydrogenated. A typical example is the Dynaron series, a product manufactured by Japan Synthetic Rubber Co., Ltd. The mixing amount of the polypropylene resin and H-SBR is 80/20 to 20/80 in weight ratio. When the polypropylene resin is large, the molded skin becomes hard, and when it is small, the tensile strength is lowered.

Further, in the present invention, the addition of process oil has the effects of being absorbed by the elastomer component in the composition to lower the melt viscosity and also lowering the hardness of the skin and providing flexibility. The above process oil is used for rubber, paraffin type, naphthene type,
Although it is classified as an aromatic type, a paraffin type is preferable due to its compatibility with the elastomer component. The addition amount is preferably 5 to 200 parts by weight with respect to 100 parts by weight of the elastomer having an excellent oil absorbing ability. If it exceeds 200 parts by weight, the tensile properties are deteriorated, and if it is less than 5 parts by weight, the melt viscosity does not decrease and the skin becomes hard.

Ethylene / octene copolymer (POE)
Is a polymer centered on a metallocene compound, has one reaction site (site) per molecule (single), and is a polymer obtained using a homogeneous single-site catalyst at every site. It has the features of having a structure, a narrow molecular weight distribution, a uniform composition distribution, and a low content of low molecular weight oligomers and waxes. Therefore, in blending with polypropylene resin, EP
DM (ethylene / propylene / non-conjugated diene copolymer)
It has better flow and dispersibility than that of, and has the property of being easily finely dispersed in polypropylene resin, making it a material suitable for slush molding.

The POE has a poorer compatibility with polypropylene resin than H-SBR. When kneaded and added to the polypropylene resin, the POE is dispersed in a size of μm, so that the tensile properties tend to be deteriorated. . But,
When H-SBR and process oil are added to polypropylene resin, H-SBR is inferior in oil absorption ability, so that the oligomer component in the composition has bleeding and has adhesiveness, and this is used. Since the elastomer powder pulverized for powder slush molding also has an adhesive property, blocking is likely to occur, and the powder fluidity is poor, and the skin lacks releasability from the mold. When an elastomer having an excellent oil absorbing ability is added to this, bleeding can be prevented by absorbing the oligomer component and oil in the composition.

The amount of POE added is H-SBR100.
It is 20 to 250 parts by weight with respect to parts by weight. When it is less than 20 parts by weight, the oligomer component and oil in the composition cannot be sufficiently absorbed, and when it exceeds 250 parts by weight,
Dispersion with the polypropylene resin becomes poor and tensile properties tend to deteriorate.

The adhesion improver is a low molecular weight polymer having a carboxyl group or a hydroxyl group which reacts with isocyanate,
Alternatively, it is an acid-modified polyolefin, and specific examples thereof include acid-modified polypropylene, hydroxyl group-containing polypropylene, hydrogenated polybutadiene having hydroxyl groups at both ends, and a hydrolyzate of ethylene / vinyl acetate copolymer. The addition amount is preferably 2 to 20% by weight, and if it is less than 2% by weight, the effect of improving the adhesiveness is small.
If it exceeds, it becomes difficult to release the molded skin from the mold, and the tensile strength is greatly reduced.

Examples of the internal release agent include dimethylsiloxane, methylhydroxypolysiloxane and methylphenylpolysiloxane. The addition amount is 0.1
5.0% by weight is preferable, and if it is less than 0.1% by weight, a sufficient releasing effect cannot be obtained, while if it exceeds 5.0% by weight, the adhesiveness to urethane foam is hindered.

As the heat stabilizer, those commonly used for polyolefins can be used. Generally, phenol and a phosphorus-based antioxidant are used in combination, but they are not particularly limited. Further, as the light stabilizer, a hindered amine or benzotriazole type which is a radical scavenger may be used. Organic or inorganic pigments suitable for ordinary olefins are used. Further, lubricants such as fatty acid metal salts and fillers such as calcium carbonate and talc are added as needed.

Mixing of these blends is carried out by using polypropylene resin, H-SBR, process oil, POE, adhesion improver, internal release agent, pigment, stabilizer, lubricant, V type blender, tumbler, Henschel mixer, etc. The dry blended product is supplied from the raw material supply hopper, and the process oil is injected from the vent port, melt-kneaded and pelletized by the twin-screw extruder.

Further, in the present invention, the organic peroxide is added to the same composition comprising the above-mentioned polypropylene resin, H-SBR, process oil, POE, and adhesion improver, internal release agent, etc., and these are heated. Kneading under the organic peroxide cuts the main chain of the polypropylene resin, lowers the molecular weight of the polypropylene resin and increases the melt fluidity, resulting in a high melt flow rate in the obtained thermoplastic elastomer composition. It has the effect of having sex. Here, the organic peroxide is not used as a crosslinking agent. Further, the thermoplastic elastomer composition obtained by kneading under heating does not substantially contain the organic peroxide due to thermal decomposition.

The above-mentioned organic peroxide is usually rubber,
Diacyl peroxide used for resin crosslinking,
Peroxyester, diallyl peroxide, di-t
-Butyl peroxide, t-butyl cumyl peroxide, dicumyl peroxide, 2.5-dimethyl-2
-5-di (t-butylperoxy) -hexane-3,1
-3-bis (t-butylperoxy-isopropyl) benzene, 1.1-di-butylperoxy-3,3,5-
Trimethylcyclohexane and the like are preferable, and one having a half-life of 1 minute by thermal decomposition of 150 to 250 ° C is preferable.

In the process of kneading under heating at 120 to 250 ° C., the organic peroxide cuts the main chain of the polypropylene resin to reduce the molecular weight, thereby giving the thermoplastic elastomer composition high melt fluidity. . The addition amount of the organic peroxide is 0.02 to 5.0% by weight in the thermoplastic elastomer composition, and if it is less than 0.02% by weight, the decomposition ability to cut the main chain of the polypropylene resin is small, It becomes impossible to impart high melt fluidity to the thermoplastic elastomer composition. On the other hand, if it exceeds 5.0% by weight, decomposition becomes excessive and mechanical properties such as tensile strength of the powder molded product deteriorate.

Mixtures of these compounds are polypropylene resin, H-SBR, POE, adhesion improver, internal mold release agent, organic peroxide, pigment, stabilizer, lubricant, filler, V type blender, tumbler, Henschel. It is dry-blended using a mixer, etc., and is supplied from the material supply hopper, and process oil is injected from the vent port and 120-250 °
It is melt-kneaded and pelletized by a twin-screw extruder whose temperature is controlled in the range of C.

Further, by using a kneader which is a closed type kneader, a Banbury mixer, etc., H- which is an elastomer component.
After adding process oil to SBR and POE and kneading them to form pellets, the pellets and polypropylene resin are mixed with an organic peroxide and other compounding agents, and then 120 to 2
It can also be pelletized by melt-kneading with a single-screw or twin-screw extruder whose temperature is adjusted to a range of 50 ° C.

The melt flow rate (MFR), which is the melt viscosity of the obtained pellets, is preferably 5 g / 10 minutes or more according to JIS K7210 at 250 ° C. and a load of 0.325 kgf. If it is less than this range, the melt fluidity of the composition tends to be low, and pinholes tend to occur in the skin.

Pellets obtained by blending mainly polypropylene resin, H-SBR, process oil, POE, adhesion improver, internal release agent, or pellets obtained by adding organic peroxide to these are Finely pulverized by using an impact type fine pulverizer such as a turbo mill, a pin mill and a hammer mill. At this time, it is usually frozen and pulverized using liquid nitrogen. Further, depending on the compounding, the molten resin can be powdered by spraying with a spray or a disk atomizer and cooling to obtain a powder slush molding material. The crushed product passes through a sieve having a particle size of at least 1,000 μm with a sieve or the like, and has an average particle size of 100 to 80.
Particles having a particle size of 0 μm are collected, and an organic or inorganic powdery improving agent is added and mixed to be used as a powder slush molding material.

Next, slush molding is performed using the powder slush molding material. In this molding, the composition is dropped into the mold heated to a temperature higher than the melting point of the composition mainly by gravity, the mold is inverted after a lapse of a predetermined time, and the excess composition is collected in a recovery box. The composition adheres to the surface of the mold as a layer and melts with time to form a skin layer.
Then, the mold is cooled to remove the skin layer from the mold,
This is repeated.

As a method for heating the mold, a method of circulating oil or putting it in a hot air oven is generally used. The oil circulation makes it easy to adjust the mold temperature due to the pipe arrangement, but it is heated only from the mold surface. On the other hand, when a hot air oven is used, it is possible to heat from both the mold surface and the back surface of the molded product, but since hot air is often set to 300 ° C or higher in consideration of productivity, the heat on the back surface of the molded product is It is necessary to consider the prescription and conditions so as not to cause oxidative deterioration.

The hot air method is effective when performing powder slush molding in multiple layers (2 to 3). That is, the first powder, which is the outermost layer, is slush molded into a heated mold,
The powder is applied a second time in the semi-molten state and slush-molded a third time if necessary, followed by heat melting. In this case, since heat transfer is insufficient by heating only from the mold surface side, a hot-air stove system that allows heating from the back surface of the molded product is often used.

The skin layer obtained by the powder slush molding described above is mounted on one mold, and a core material made of a synthetic resin such as polypropylene, ABS or polystyrene is placed on the other mold, and a polyurethane is interposed between them. A foaming stock solution is cast to form a foaming layer to form a molded article with a skin.

In order to improve the adhesiveness between the skin layer and the foam layer, cleaning, corona discharge, flame treatment, application of an adhesive or the like can be used together on the adhesive surface of the molded skin layer.

[0039]

EXAMPLES Next, the present invention will be described in more detail with reference to specific examples. Examples 1 to 4 and Comparative Examples 1 and 2 A material obtained by dry blending the materials shown in Table 1 excluding the process oil with a tumbler was supplied from a raw material supply hopper of a twin-screw extruder (PCM45, manufactured by Ikegai Steel Co., Ltd.), While injecting the process oil from the vent port, the mixture was kneaded and extruded at a cylinder temperature of 210 ° C. and a screw rotation speed of 300 rpm to form pellets. And turbo mill T250-4
Pellets dipped in liquid nitrogen were put into J (manufactured by Turbo Kogyo Co., Ltd.) and pulverized, and only a portion passing through a 1,000 μm sieve was collected.

Next, powder slush molding was performed using the above powder material. As a method of powder slush molding,
First of all, 150mm × 150mm × 3m with leather grain pattern
m plate was heated to 250 ° C in an oven, and about 800 g of the above-mentioned powder material was placed on the plate for 10 minutes to be adhered thereto, and the powder which was not melt-adhered was removed to 300 ° C. It was heated for 60 seconds in the adjusted oven, taken out of the oven and cooled with water, and a skin having a thickness of about 0.8 mm was demolded.

The difficulty of the demolding property of the epidermis was judged by the sense. ○ is good and × is bad. For the tensile properties of the skin, the skin obtained by slush molding was punched with JIS No. 3 dumbbell, and the tensile strength and elongation were measured at a tensile speed of 200 mm / min.

Adhesiveness evaluation is 300 × 200 × 8 mm
Using a 340 × 200 × 12 mm iron plate having a dent as a mold, heating in an oven at 40 ° C., placing a skin forming sheet on the bottom of the dent, and injecting about 100 g of a semi-rigid urethane foam raw material liquid premixed, Immediately, it was sealed with an aluminum plate and heated in an oven at 40 ° C. for 4 minutes to obtain a skin and a urethane foam laminate. Width 25mm, length 1
It was cut into 50 mm and used as an evaluation sample. It was evaluated at a peeling strength of 180 ° and a peeling state at a tensile speed of 200 mm / sec. The state of peeling was evaluated as ◯ when cohesive failure occurred on the entire urethane foam, Δ when partial cohesive failure occurred, and x when the interfacial surface failure occurred. The results are also shown in Table 1.

[0043]

[Table 1]

As a result, it can be seen that in the examples, the releasability of the skin from the mold is good and the peel strength between the skin and the urethane foam is high.

[0045]

As described above, according to the invention described in the claims of the present application, at least polypropylene resin, H-SBR, process oil, POE, and acid-modified polypropene as an adhesion improver.
Pyrene, polypropylene with hydroxyl group, hydroxyl groups at both ends
Polybutadiene added, and ethylene vinyl acetate
2 to at least one selected from the hydrolyzate of limer
20% by weight, and dimethylsiloxa as an internal release agent
Methyl hydroxypolysiloxane, methyl phenyl
0.1 at least one selected from
5.0% to that powder slush molding a thermoplastic elastomer composition containing and because it is a powder slush molding material obtained therefrom, epidermis and urethane foam
It has a high peeling strength with and has good demoldability from the mold of the skin, and it also absorbs process oil as a softening agent in the elastomer component including hydrogenated styrene butadiene rubber and elastomer with excellent oil absorption capacity and melt flow Has improved sex.

In the case of a powder slush molding thermoplastic elastomer composition obtained by adding an organic peroxide to these and a powder slush molding material obtained by using the same, the above-mentioned organic peroxide is kneaded under heating. In the process, the main chain of the polypropylene resin is cleaved to lower the molecular weight of the polypropylene resin to increase the melt fluidity, and the obtained thermoplastic elastomer powder has high melt fluidity.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Manabu Okazawa 4-1-21, Hamazoe-dori, Nagata-ku, Kobe Mitsuboshi Belting Co., Ltd. (56) Kaihei 10-279738 (JP, A) JP-A-10-81793 (JP, A) International Publication 98/033850 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) C08L 1 / 00-101/16 B29C 41/18

Claims (8)

(57) [Claims] 1. A powdery thermoplastic elastomer composition used for powder slush molding, which comprises at least polypropylene resin, hydrogenated styrene butadiene random copolymer rubber, process oil, and ethylene-octene copolymer having a long-chain branched structure. Acid-modified polyp as an adhesion improver
Ropylene, polypropylene containing hydroxyl groups, hydroxylated water at both ends
Element-added polybutadiene, and ethylene / vinyl acetate
At least one selected from polymer hydrolysates
~ 20 wt% and dimethylsiloxa as internal mold release agent
Methyl, methyl hydroxypolysiloxane, and methyl
At least one selected from phenyl polysiloxane
A thermoplastic elastomer composition for powder slush molding, comprising 0.1 to 5.0% by weight . 2. A powdery thermoplastic elastomer composition used for powder slush molding, which comprises at least polypropylene resin, hydrogenated styrene butadiene random copolymer rubber, process oil, and ethylene / octene copolymer having a long-chain branched structure. , Organic peroxide, as adhesion improver
Acid-modified polypropylene, hydroxyl group-containing polypropylene,
Hydrogenated polybutadiene with hydroxyl groups at both ends, and ethylene
・ Small amount selected from hydrolyzate of vinyl acetate copolymer
2 to 20% by weight of at least one kind, and di
Methyl siloxane, methyl hydroxy polysiloxa
And methylphenylpolysiloxane
A thermoplastic elastomer composition for powder slush molding, which comprises 0.1 to 5.0% by weight of at least one kind . 3. 250 according to JIS K-7210
The melt flow rate (MFR) of the above-mentioned thermoplastic elastomer composition measured at 0 ° C and a load of 0.325 kgf is
The thermoplastic elastomer composition for powder slush molding according to claim 1 or 2, which has a content of 5 g / 10 minutes or more. 4. A polypropylene resin and a hydrogenated styrene butadiene random copolymer rubber in a weight ratio of 80/20 to.
20/80, The thermoplastic elastomer composition for powder slush molding according to claim 1 or 2. 5. The ethylene / octene copolymer having a long-chain branched structure is contained in an amount of 20 to 250 parts by weight based on 100 parts by weight of hydrogenated styrene-butadiene random copolymer rubber. Thermoplastic elastomer composition for powder slush molding. 6. The process oil has a long-chain branched structure.
5 to 2 per 100 parts by weight of the ethylene / octene copolymer
The thermoplastic elastomer composition for powder slush molding according to claim 1 or 2, containing 100 parts by weight. 7. A polypropylene resin, hydrogenated styrene
Butadiene random copolymer rubber, process oil, long chain
Ethylene / octene copolymer with branched structure, adhesion improvement
Acid modified polypropylene, hydroxyl group-containing polypropylene
Ren, hydroxylated hydrogenated polybutadiene at both ends, and
Selected from hydrolysates of ethylene / vinyl acetate copolymer
2 to 20% by weight, and an internal mold release agent
Dimethyl siloxane, methyl hydroxypolysiloxane
Xanth, and selected from methylphenyl polysiloxane
Heat containing at least one of 0.1 to 5.0% by weight
Pelletizing a thermoplastic elastomer composition by heating and mixing
Then, a powder slush molding material characterized by pulverizing this pellet . 8. Polypropylene resin, hydrogenated styrene
Butadiene random copolymer rubber, process oil, long
Ethylene / octene copolymer with chain branching structure, organic polymer
Oxide, acid-modified polypropylene as adhesion improver, hydroxy
Group-containing polypropylene, hydroxylated hydrogenated polybutadiene on both ends
Hydrolysis of diene and ethylene-vinyl acetate copolymer
2 to 20% by weight of at least one selected from decomposed products,
And dimethylsiloxane, methyl high as an internal release agent
Droxypolysiloxane, and methylphenylpolysiloxane
0.1 to 5.0 at least one selected from roxane
Heat-mixing thermoplastic elastomer composition containing 10 wt%
Powder slush molding material and then pelleted by, and JP <br/> symptom that the pellets were powdered.