JP2564883B2 - Resin composition for sheet molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a resin composition for sheet molding, which is excellent in elastic modulus, heat resistance, transparency, odor, and vacuum moldability.

<Prior Art> Polypropylene has been widely used as a packaging material for foods, pharmaceuticals and the like because of its excellent oil resistance, elastic modulus, heat resistance, moisture resistance and the like. In particular, a container formed from a sheet by secondary processing such as vacuum forming or pressure forming is economically superior because it has a higher processing speed than other processing methods, and is widely used. However, polypropylene also has performance to be improved. That is, polypropylene is inferior in transparency, elastic modulus, vacuum moldability, and air pressure moldability as compared with polystyrene and polyvinyl chloride. Further, there is a drawback that the impact strength is low at a temperature below room temperature.

As a method of improving the transparency and elastic modulus of polypropylene, JP-A-58-80329 discloses a method of adding an aluminum salt or sodium salt of an aromatic carboxylic acid, JP-A-55-12460. Japanese Patent Laid-Open No. 58-129036 proposes a method of adding an aromatic carboxylic acid, an aromatic phosphoric acid metal salt, a sorbitol derivative or the like. Among these methods, aromatic carboxylic acid, aromatic carboxylic hydrochloric acid, and aromatic metal phosphate metal salts have improved transparency and elastic modulus, but their degree is small. The sorbitol derivative has a great effect of improving the transparency, but it significantly reduces the value of the product during the molding process and because the odor of the molded product is large.

As a method for solving such a problem, JP-A-60-139710 proposes a method in which (a) polymerization of vinylcycloalkane having 6 or more carbon atoms and (b) propylene alone or copolymerization with ethylene in multiple stages. Has been done. In addition, JP-A-60-13
Japanese Patent No. 9731 proposes a crystalline polypropylene composition containing a branched α-olefin having 6 or more carbon atoms or a vinylcycloalkane. Further, JP-A-61-21144 proposes a crystalline polypropylene sheet containing a branched α-olefin having 6 or more carbon atoms or vinylcycloalkane. These methods are excellent methods because the transparency and elastic modulus are remarkably improved and the odor is small.

On the other hand, as a means for improving the impact strength, a method of copolymerizing propylene with other α-olefin, especially ethylene, a method of adding a rubber-like substance and the like are known. The random copolymerization method and the block copolymerization method are generally used as the copolymerization method. In the random copolymerization method, the copolymerization α
-If the content of olefin is small, the impact strength improving effect is small, and if the content is large, the elastic modulus is remarkably lowered. Further, the block copolymerization method and the method of adding a rubber-like substance have a great effect of improving the impact strength, but the transparency is remarkably lowered.

<Problems to be Solved by the Invention> However, JP-A-60-139710 and JP-A-60-
In JP-A-139731 and JP-A-61-21144, transparency, elastic modulus and the like are improved, but secondary processability such as vacuum moldability and impact strength are not satisfied as a resin composition for sheet molding. An object of the present invention is to provide a resin composition for sheet molding, which has excellent secondary processability such as elastic modulus, heat resistance, transparency, odor, and vacuum moldability, and impact resistance.

<Means for Solving the Problems> That is, the present invention is a 3-position branched α-olefin having 6 or more carbon atoms or vinyl cycloalkane, which is 1 to 100000 wtpp
Component (A) consisting of crystalline propylene polymer or copolymer containing m of 95 to 40 wt% and density of 0.950 to 0.890 g /
cc, the component (B) of the ethylene polymer or copolymer having a refractive index higher than that of the component (A) 3 to 55 wt%
Is 0.890 g / cc or less, and the component (C) of the ethylene copolymer having a refractive index of component (A) or less is 2 to 40 wt.
% Resin composition for sheet molding.

Component (A) is a process for producing a crystalline propylene polymer or copolymer containing a 3-position branched α-olefin having 6 or more carbon atoms or a polymer of vinylcycloalkane, (1) a Ziegler-Natta catalyst A step of polymerizing a 3-position branched α-olefin having 6 or more carbon atoms or a vinylcycloalkane in the presence thereof or copolymerizing with another α-olefin, and a step of copolymerizing propylene alone or with another α-olefin And a step of copolymerizing propylene alone or with another α-olefin at least once.

(2) A method in which the polymer obtained in (1) above is mixed with propylene alone or with a copolymer of another α-olefin.

(3) 3-position branched α-olefin having 6 or more carbon atoms, or
Polymer of vinylcycloalkane, or copolymer with other α-olefins, homopolymer of propylene, or
A method of mixing propylene with a copolymer of other α-olefin.

Etc. Of these methods, the methods (1) and (2) are most preferable because the effect of improving transparency, elastic modulus, and heat resistance is large, and the method (1) is most preferable because the effect of improving is largest.

As a method for copolymerizing a 3-position branched α-olefin having 6 or more carbon atoms or a vinylcycloalkane with another α-olefin, either random copolymerization or block copolymerization may be used, but block copolymerization is effective. Therefore, it is particularly preferable. The α-olefin to be copolymerized is preferably a linear or branched α-olefin having 2 to 20 carbon atoms.

As the method for producing the crystalline propylene polymer or copolymer as the component (A), propylene is polymerized alone by a catalyst system giving isotactic propylene, or propylene and ethylene and C4-10 are used. It can be obtained by copolymerizing at least one kind of monomer selected from linear or branched α-olefins. As a method of copolymerization, either a random copolymerization method or a block copolymer method can be carried out,
The random copolymer method is preferable because it has a greater effect of improving transparency.

When the content of the low crystalline component is large, the component (A) bleeds the low crystalline component on the surface of the molded product, thus impairing the commercial value. As a result of the study conducted by the present inventors, it was found that the above problem can be solved by setting the content of the xylene-soluble component at 20 ° C. to a certain value or less. That is, the content of the xylene-soluble component at 20 ° C. of the component (A) is preferably 40 wt% or less, more preferably 30 wt% or less, most preferably 15 wt% or less.

In order to bring the content of the xylene-soluble component at 20 ° C. of the component (A) into this range, the catalyst system which gives highly isotactic polypropylene described below is used, and The content of at least one monomer selected from the group consisting of ethylene copolymerized with propylene in the crystalline propylene polymer or copolymer portion and linear or branched α-olefin having 4 to 10 carbon atoms is preferably 20 mol. % Or less, more preferably 15 mol% or less, and most preferably 10 mol% or less.

Specific examples of the 3-position branched α-olefin having 6 or more carbon atoms or the vinylcycloalkane used in the present invention are as follows.
3,3-dimethylbutene-1,3-methylpentene-1,
3-methylhexene-1,3,5,5-trimethylhexene-
1, vinylcyclopentene, vinylcyclohexane, vinylnorbornane, and the like. Of these, olefins having 8 or more carbon atoms are more preferable.

Specific examples of the 3-position branched α-olefin having 6 or more carbon atoms or vinyl cycloalkane used in the present invention include 3,3-dimethylbutene-1,3-methylpentene-
1,3-methylhexene-1,3,5,5-trimethylhexene-1, vinylcyclopentene, vinylcyclohexane, vinylnorbornane, and the like. Of these, olefins having 8 or more carbon atoms are more preferable.

When the content of 3-position branched α-olefin having 6 or more carbon atoms or vinyl cycloalkane polymer is less than 1ppm, the effect of improving transparency and elastic modulus when processed into a sheet is small, and when it is more than 100000ppm. Is less transparent. Therefore, the content of 1 to 100000 ppm is preferable. More preferably 100 to 70,000 ppm, most preferably 500 to 50,000 p
pm.

Production of a crystalline propylene polymer or copolymer containing a 3-position branched α-olefin having 6 or more carbon atoms or a polymer of vinylcycloalkane is achieved by using a catalyst system which gives isotactic propylene. You can do it. A Ziegler-Natta type catalyst system can be most preferably used as a catalyst system for providing isotactic polypropylene. Among the Ziegler-Natta type catalyst systems, those comprising at least a solid catalyst component containing titanium and chlorine, an organoaluminum compound, or an electron donating compound are preferred, and more preferably the catalyst system is 4 in liquefied propylene. When polymerized for a period of time, the soluble portion of xylene in the polymer at 20 ° C. is 5% by weight or less, most preferably 4% by weight or less.
The solid catalyst component that can be preferably used in the present invention will be described more specifically below.

There are roughly two methods for synthesizing the solid catalyst component. One of them is a solid catalyst component obtained by reducing a tetravalent titanium compound with hydrogen, metal aluminum, an organometallic compound, or the like, or one obtained by further pulverizing and activating them, or a tetravalent titanium compound is an organometallic compound. The method is to obtain a catalyst by subjecting it to various activation treatments after obtaining a catalyst precursor by reduction with, and the other is to carry a tetravalent titanium compound on a carrier such as activated magnesium chloride. Is a method of obtaining a catalyst. Among the former methods, methods of reducing a tetravalent titanium compound with an organometallic compound and then performing activation treatment include a method of using an organoaluminum compound as a reducing reagent and a method of using an organomagnesium compound. Specifically, (1) a reduced solid produced by reducing TiCl ₄ with an organoaluminum compound is treated with a complexing agent, and then
How to react with TiCl ₄ . (Japanese Patent Publication No. 53-3356) (2) A method in which a titanium compound represented by the general formula Ti (OR) _n X _4-n is reduced with an organic aluminum compound and then treated with an ether compound and TiCl ₄ . (JP-A-60-228504) (3) After a titanium compound represented by the general formula Ti (OR) _n X _4-n is reduced with an organomagnesium compound in the presence of an organosilicon compound, an ester compound is used. Treatment and treatment with a mixture of an ether compound and TiCl ₄ . (JP-A 61-287904) (4) A method of immobilizing the catalyst component obtained in (3) on a porous substance. (Japanese Patent Laid-Open No. 62-256802) and the like.

As a polymerization method for producing the component (A), any one of polymerization in an inert solvent, a liquefied monomer, or a gas phase can be used. The polymerization may be continuous polymerization, batchwise polymerization, or a combination thereof. Further, each step of the polymerization is a method of carrying out the polymerization while leaving all or a part of the solvent and the monomer in the previous step, or a method of carrying out the polymerization after removing the solvent and the monomer in the previous step, or Any combination of methods can be used.

An ethylene polymer which is the component (B) of the present invention, or
As the copolymer, at least one resin composition selected from linear ethylene and α-olefin copolymer, or branched ethylene polymer or copolymerizable polar monomer copolymer Is. More specifically, the linear ethylene copolymer is a so-called linear medium density polyethylene which is a copolymer of ethylene and another α-olefin polymerized by a Ziegler-Natta catalyst or a chromium-based catalyst. It is a linear low-density polyethylene or the like. As a branched ethylene polymer or a copolymer with a polar monomer copolymerizable with ethylene, generally, under a high pressure of 500 kg / cm ² or more, using a radical catalyst,
A polymer obtained by polymerizing ethylene or a polar monomer copolymerizable with ethylene, which is branched polyethylene, ethylene / vinyl acetate copolymer,
Mention may be made of ethylene / methyl methacrylate copolymer and the like. Of these, a branched ethylene polymer or a copolymer with a polar monomer copolymerizable with ethylene is preferable because the melt tension is large and the vacuum forming is good, and the branched polyethylene has good thermal stability. Therefore, it is most preferable because it has no odor and is good.

The ethylene copolymer which is the component (C) of the present invention is a copolymer of ethylene which is polymerized using a Ziegler-Natta catalyst and a linear or branched α-olefin, which is so-called ethylene. Examples thereof include α-olefin elastomer and ultra-low density linear polyethylene (ethylene / α-olefin copolymer).

The excellent transparency of the final resin composition is that the refractive index of the component (B) is not less than the refractive index of the component (A) and the refractive index of the component (C) is not more than the refractive index of the component (A). It can be achieved in some cases. Furthermore, component (B) and component (C)
Has a refractive index of -0.010 to 0.015 with respect to the component (A) when mixed, preferably -0.005 to 0.12.
Is most preferable, and the most preferable range is -0.000 to 0.010, because a resin composition for sheet molding having extremely excellent transparency can be obtained. The composition of the component (B) and the component (C) are not necessarily uniform in molecular size, and the excellent transparent resin composition of the present invention of the present invention can be obtained. In this case, the composition comprising the component (B) and the component (C) and the refractive index have values close to the weighted average value of the refractive index of each component.

When the final resin composition has a remarkably low melt index, the surface of the resin composition is roughened during processing of the sheet and the transparency is lowered, which is not preferable. Further, if the melt index is extremely high, there is a problem that a uniform molded product cannot be formed due to the sagging of the sheet in the step of heating the sheet in the secondary processing, particularly in vacuum forming, or in some cases, contact with the heating device. appear. Therefore, the melt index of the final resin composition is preferably 0.1 to 10.0 g / 10 minutes, more preferably 0.2 to 8.0, and most preferably 0.3 to 5.0.

Further, known inorganic or organic fillers and resins can be added to the resin composition of the present invention.

The method of processing the resin composition of the present invention into a sheet is not particularly limited, but an extrusion molding method or a calendar processing method is generally used. In particular, the extrusion molding method is preferably adopted because the processing speed is generally high. The method for cooling the extruded molten resin is also not particularly limited, but a method using a cooling roll, a method using an air knife,
A known method such as a method using a liquid medium such as water or a combination of these methods can be used.

The sheet generally has a single layer and a multilayer for the purpose of improving the gas barrier property and the like, but the resin composition of the present invention can be used as a single layer sheet or as a part of a multilayer sheet. Can be used.

The sheet produced by the above method can be subjected to secondary processing by a known processing method such as vacuum forming or pressure forming, and can be used as a sheet as in a case of a book binder or a video cassette. Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these descriptions.

The physical property values shown in the following examples and comparative examples are measured by the following methods.

(1) [η] It was measured in 135 ° C. tetralin using an Ubbelohde viscometer.

(3) Melt index Measured according to JIS K6758.

(4) Press molding Measured according to JIS K6758.

(5) Diffuse transmitted light intensity (LSI) It was measured by an LSI tester manufactured by Toyo Seiki (receives scattered transmitted light of 0.2 ° to 1.2 °).

(6) Haze Measured according to ASTM D1003.

(7) Flexural modulus Measured according to JIS K7203.

(8) Izod impact strength Measured according to JIS K7110.

(9) Vicat softening temperature Measured according to JIS K7206-B method.

(10) Melt tension Using the Toyo Seiki melt tension tester type II, L /
Using a die with D = 4 (D = 2 mm), the tension applied to the monofilament was measured under the conditions of a resin temperature of 190 ° C., an extrusion speed of 0.32 g / min, and a take-up speed of 15.7 m / min.

(11) Refractive index A 0.1 mm sheet was processed by the method of (4) and measured with a sodium D line using an Abbe refractometer 2T type (manufactured by Atago Co., Ltd.).

(12) Amount of xylene-soluble component at 20 ° C. 100 ml of xylene was added to 0.5 g of the sample and the sample was dissolved by keeping it in the boiling state for 30 minutes. Then, the mixture was kept under stirring in a constant temperature bath kept at 20 ° C. for 1 hour and then subjected to solid-liquid separation, and the liquid phase was evaporated to dryness to determine the ratio of the dissolved polymer.

(13) Density Measured by JIS K7112 A method.

<Example> Examples 1-3 and Comparative Examples 1-3 (Synthesis of titanium trichloride solid catalyst) A titanium trichloride solid catalyst was synthesized according to the method of JP-A-60-228504. After the reactor with an internal volume of 3 m ² equipped with a stirrer was replaced with nitrogen, n-hexane 788, titanium tetrachloride 73 and tetra-n-butoxytitanium 223 were charged into the reactor and the contents of the reactor were stirred. The temperature was kept at 20 ° C. A solution consisting of n-hexane 373 and diethylaluminum chloride 172 was gradually added dropwise over 4.5 hours while maintaining the temperature in the reactor at 20 ° C. 20 ℃ after dropping
The temperature was maintained at 50 ° C for 30 minutes, and the mixture was stirred for 1 hour. Then, the mixture was allowed to stand at room temperature to separate solid and liquid, and washed 3 times with 1 m ³ of n-hexane to obtain a solid product.

1 m ³ of n-hexane was added to the obtained solid product to make a slurry, diethyl aluminum chloride 8.3 was added, the temperature was adjusted to 42 ° C., and 33 kg of ethylene gas was supplied for about 1 hour to obtain a prepolymerized solid. Then, after solid-liquid separation, n
-Add 1 m ³ of hexane to make a slurry and adjust the temperature in the reactor to 3
It was kept at 0 ° C. Diisoamyl ether 2 in this starry
67 was added and treated at 30 ° C. for 1 hour. Then, the temperature in the reactor was raised to 75 ° C., titanium tetrachloride 362 was added, and the mixture was treated for 2 hours. After solid-liquid separation, washing with 1 m ³ of n-hexane was repeated 4 times, and then flow-dried with hydrogen gas to dry 25
0 kg of titanium trichloride solid catalyst was obtained.

(Synthesis of Copolymer of Vinyl Cycloalkane) Into a glass flask of No. 5, 3.5 n-hexane dehydrated and purified, 165 mmol of diethylaluminum chloride and 500 g of the above titanium trichloride solid catalyst were added, and the temperature was raised to 40 ° C. did. Then, propylene was supplied to start polymerization so that the partial pressure became 200 mmHg. Polymerization of propylene was carried out until the amount of polymerization reached 400 g. Then, the temperature was raised to 60 ° C., and 700 g of vinylcyclohexane was dividedly supplied at intervals of 30 minutes, and then the temperature was kept at 60 ° C. for 2 hours to continue the polymerization. The obtained polymer containing titanium trichloride solid catalyst was washed with 1.5 parts of n-hexane and then dried at 40 ° C. under reduced pressure for 6 hours to obtain a polymer containing 1580 g of active catalyst component. As a result of calculating the mass balance, 1 g of solid catalyst component
This means that 0.8 g of propylene polymer and 1.36 g of vinylcyclohexane polymer were polymerized.

(Synthesis of Crystalline Polypropylene Copolymer) 5.7m adjusted to 0.5kg / cm ² G at 35 ° C with propylene
³ equipped with a stirrer made of stainless steel reactor, n of dehydrated and purified
-Heptane 2.7 m ³ , diethylaluminum chloride 22.5
Mol, ε-caprolactone 0.24 mol, and 2050 g of a polymer containing the above-mentioned active catalyst component were sequentially added. Then, the temperature was adjusted to 50 ° C., 23 kg of butene-1 was supplied, and then the pressure in the reactor was increased to 4 kg / cm ² G at a rate of 500 kg / hr of propylene and 50 kg / hr of butene-1. After increasing the pressure, propylene and butene-1 were supplied so that the pressure in the reactor was maintained at 4 kg / cm ² G. During this period, the supply of propylene and butene-1 was maintained at 1 / 0.045 (weight ratio) of propylene / butene-1. During the polymerization, the hydrogen concentration in the gas phase of the reactor was kept at about 0.75 vol%. Propylene supply is 902
When kg was reached, the monomer feed was stopped. When the pressure in the reactor reached ² kg / cm ² , the polymer-containing slurry was transferred to a nitrogen-purged washing tank having an internal volume of 20 m ³ and n-
Polymerization was stopped by adding 2.4 m ^{3 of} peftan and 85 of n-butanol. After stirring at 60 ℃ for 1 hour, water 1.2m ³
Was added and KOH was added so that the pH of the aqueous phase became 11. 50 ~ 5
Stirred at 5 ° C. for 30 minutes. Subsequently, stirring was stopped, the aqueous phase was separated and removed, and the remaining heptane slurry was subjected to solid-liquid separation by a decanter. The recovered polymerized polymer cake was dried with hot nitrogen at 70 to 80 ° C. for about 30 hours to obtain 850 kg of a white polymer. Polymer [η] is 3.20 dl / g, butene-
The content of 1 was 6.0, the content of the polymer of polyvinylcyclohexane was 1038 ppm, and the content of xylene or soluble components at 20 ° C. was 1.9 wt%.

(Preparation of Resin Composition) With respect to the crystalline polypropylene copolymer synthesized by the above method as the component (A), the density of the component (B) is 0.
919 g / cc, branched density polyethylene with a melt index of 0.9 g / 10 min, and ethylene as component (C) with a density of 0.868 g / cc and a melt index of 0.7 g / 10 min. A butene-1 rubbery polymer was blended in a composition shown in Table 1, extruded by 65 mmφ, melt-kneaded, extruded in a strand shape and then pelletized. In order to prevent thermal deterioration of the resin during melt-kneading, 0.05 part of calcium stearate, 0.23 part of tris (2,4-ditertiarybutylphenyl) phosphite, tetra [methylene-3- (3,3,3 5-ditertiarybutyl-4-hydroxyphenyl) propionate]
0.18 parts of methane was added.

The obtained pellets were molded into a sheet using a hot press molding machine and the physical properties were measured. The results are shown in Table 2.

The obtained pellets were formed into a sheet by a 65 mmφ extruder equipped with a T-die. The results of measuring the physical properties of the obtained molded product are shown in Table 2. The sheet molding was performed under the following conditions.

Cooling method; Air knife method Die width; 600mm Resin temperature; Approx. 290 ℃ Roll temperature 1st roll; 60 ℃ 2nd roll; 20 ℃ Roll speed; 1.5m / min As a result of measuring the refractive index of each resin component, the crystalline polypropylene copolymer was 1.501, the branched low-density polyethylene was 1.515, and the ethylene / butene-1 rubbery polymer was 1.483.

For the purpose of determining the refractive index of the mixture of the component (B) and the component (C) in the resin compositions of Examples 1 and 2, a branched low density polyethylene and an ethylene / butene-1 rubbery copolymer were used in each Example. After melt kneading with a composition corresponding to, the refractive index of the kneaded product was measured. Refractive index of 1.50 each
8, 1.504, 1.510, the difference in refractive index for the crystalline polypropylene copolymer is 0.007, 0.004, 0.00, respectively.
It was 9.

Comparative Example 4-5 As to the crystalline polypropylene polymer in which [η] was 3.30 dl / g and the xylene-soluble portion at 20 ° C. was 3.9 wt% as the component (A), the density was 0.919 as the component (B). Branched low-density polyethylene having a g / cc and a melt index of 0.9 g / 10 g was blended in the composition shown in Table 4, melt-kneaded by an extruder and pelletized. For the purpose of preventing the heat deterioration of the resin during melt-kneading, 0.05 part of calcium stearate, 0.23 part of tris (2.4-ditertiarybutylphenyl) phosphite, tetra [methylene-3-], relative to 100 parts of the resin.
0.08 parts of (3.5-ditertiarybutyl-4-hydroxyphenyl) propionate] methane was added. The obtained pellets were press-molded and extruded sheet-molded under the same conditions as in the above example. The results of measuring the physical properties of the obtained molded products are shown in Tables 5 and 6.

As a result of measuring the refractive index of the crystalline polypropylene polymer,
It was 1.503.

Comparative Example 1 is a composition of the component (A) alone consisting of a crystalline propylene copolymer containing a 3-position branched α-olefin having 6 or more carbon atoms of the present invention or a vinylcycloalkane, but Comparative Example 4 It can be seen that the transparency is extremely excellent as compared with the case of the usual crystalline propylene polymer shown in. Further, in the step of polymerizing crystalline propylene, the flexural modulus and the Vicat softening temperature which are bent as compared with the propylene homopolymer of Comparative Example 4 despite being copolymerized with butene-1 are excellent and are excellent. Is. However, the melt tension, which is a measure of vacuum formability, is low, and the Izod impact strength is not improved at all.

Tables 2 to 3 clearly show that Examples 1 to 3 have improved melt tension and impact strength without impairing the transparency of Comparative Example 1. Further, in Examples 1 to 3, the flexural modulus and the Vicat softening temperature are slightly lower than those of Comparative Example 1, but they maintain the excellent levels originally possessed by polypropylene.

Comparative Example 2 is a system in which the component (B) is added to the component (A), but is inferior to the examples in terms of transparency and impact strength. Comparative Example 3 is a system in which the component (C) is added to the component (A), but the transparency is inferior as compared with the examples. Comparative Example 5 is a system in which the component (B) is added to ordinary crystalline polypropylene, but the transparency and impact strength are poor.

<Effect of the Invention> The component (A) made of a crystalline propylene polymer or copolymer containing a 3-position branched α-olefin having 6 or more carbon atoms or vinylcycloalkane, and a density of 0.950 to
An ethylene polymer or copolymer component (B) having a refractive index of 0.890 g / cc and having a refractive index of component (A) or more;
A composition comprising a component (C) of an ethylene copolymer having a density of 0.890 g / cc or less and a refractive index of component (A) or less and having a composition defined by the present invention is A resin composition for sheet molding, which exhibits transparency, elastic modulus, heat resistance, low odor, melt tension, and is excellent in impact strength.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazuki Wakamatsu 5-1 Anezaki Kaigan, Ichihara, Chiba Prefecture Sumitomo Chemical Co., Ltd. (72) Inventor Tomohisa Fukao 5-1 Anesaki Kaigan, Ichihara, Chiba Sumitomo Chemical Co., Ltd. Within the corporation (56) Reference JP-A-60-139710 (JP, A) JP-A-53-108146 (JP, A) JP-A-60-139731 (JP, A)

Claims (6)

(57) [Claims] 1. A component (A) consisting of a crystalline propylene polymer or copolymer containing 1 to 100,000 wtppm of a 3-position branched α-olefin having 6 or more carbon atoms or a vinylcycloalkane, and a density of 95 to 40 wt%. Is 0.950 to 0.890 g / cc, and the component (B) of the ethylene polymer or copolymer having a refractive index of component (A) or more is 3 to 55 wt% and the density is
A resin composition for sheet molding, which is 0.890 g / cc or less and comprises 2 to 40 wt% of a component (C) of an ethylene copolymer having a refractive index of component (A) or less. 2. The crystalline propylene polymer or copolymer of component (A) contains 75 to 100 mol% of propylene units, at least one selected from ethylene and a linear or branched α-olefin having 4 to 10 carbon atoms. 0 types of monomer units
The amount of the xylene-soluble component at 20 ° C. in the component (A) is 40 wt% or less.
The sheet-forming resin composition as described above. 3. The resin composition for sheet molding according to claim 1, wherein the component (B) is a branched low-density polyethylene. 4. The resin composition for sheet molding according to claim 1, wherein the component (C) is a copolymer of ethylene and α-olefin. 5. The resin composition for sheet molding according to claim 1, wherein the refractive index of the mixture of the component (B) and the component (C) with respect to the component (A) is in the range of -0.010 to 0.015. 6. The composition has a melt index of 0.1 to 10.
The resin composition for sheet molding according to claim 1, which has an amount of 0 g / 10 minutes.