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Propylene resin composition for stretched sheet, and stretched sheet and thermally molded article each comprising the composition

A technology of propylene resin and resin composition, which is applied in the field of stretched sheet and thermoformed body, can solve the problems of equipment cost (high manufacturing cost, difficult roll film forming, difficult to say is sufficient, etc.), and achieve uniform stretching Good properties, excellent shape stability, and good thermoformability

Inactive Publication Date: 2010-10-06
PRIME POLYMER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain the sheet thickness (0.1 to 1 mm) that is the object of the present invention by such high-ratio stretching, the thickness of the sheet (roll film) before stretching must be 5 to 50 mm (BOPP is usually 1 to 3 mm) , if a roll film of such thickness is formed, it is difficult to form the roll film, and it cannot be stretched in existing equipment
In this way, when the roll film is made into a normal thickness and stretched at a low ratio, stretching unevenness (uneven thickness) due to stretching residue (necking) tends to occur, so it is difficult to obtain the target sheet thickness.
[0007] In the case of uniaxial stretching, even if it can be stretched at a low ratio, the stretching unevenness is less than the above method, and it is easier to obtain the target sheet thickness. However, in terms of thermoformability, the stretching ratio must be controlled below 3 times. Therefore, sheet physical properties such as rigidity and transparency become insufficient (for example, Japanese Patent Application Publication No. 53-94371, Japanese Patent Application Publication No. 53-128673)
In addition, there is also known a method of uniaxial stretching in combination with a special web quenching method (for example, Japanese Patent Publication No. 63-16256 and Japanese Patent Publication No. 63-62377), but the physical properties of the sheet are slightly limited. Improvement, but it is hard to say that it is sufficient. In addition, it is not ideal because the cost of equipment (manufacturing cost) becomes high

Method used

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  • Propylene resin composition for stretched sheet, and stretched sheet and thermally molded article each comprising the composition
  • Propylene resin composition for stretched sheet, and stretched sheet and thermally molded article each comprising the composition
  • Propylene resin composition for stretched sheet, and stretched sheet and thermally molded article each comprising the composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] After prepolymerizing 3-methyl-1-butene (3MB-1) as a nucleating component, 0.1 parts by weight of tetrakis[methylene-3-( 3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane (IRGANOX1010, manufactured by Ciba Specialty Chemicals, trademark) and 0.1 parts by weight of tris(2,4-di-tert-butylphenol) phosphate (IRGAFOS168, produced by Ciba Specialty Chemicals, trademark), as a neutralizing agent, mixed with 0.1 parts by weight of calcium stearate (produced by Nippon Oils and Fats Co., Ltd.), using a single-screw extruder, melting and kneading with a resin temperature of 230° C. to produce Granules become granular. Wherein, the resin composition is obtained by 75% by weight of high melting point propylene resin (A′-1) obtained by homopolymerization of propylene with Tm=167°C, MFR=2g / 10min, mmmm=0.972, and 6mol% of propylene and ethylene by copolymerization Tm = 135 ° C, MFR = 2g / 10min low melting point propylene resin (A"-1) 25% by weight combined. At this time, the ratio...

Embodiment 2

[0106] In addition to using a resin combination in which 50% by weight of the high-melting propylene-based resin (A'-1) used in Example 1 and 50% by weight of the low-melting propylene-based resin (A"-1) used in Example 1 were used Table 1 shows the results in the same manner as in Example 1 except that the ratio of the 3MB-1 polymer was 0.018% by weight in the resin composition.

Embodiment 3

[0108] After pre-polymerization of 3-methyl-1-butene as a nucleating component, a high-melting propylene-based resin (A'- 2) A resin composition obtained by combining 50% by weight and 50% by weight of the low-melting propylene resin (A″-1) used in Example 1 (the ratio of the 3MB-1 polymer in the resin composition is 0.017% by weight ) except that it was carried out in the same manner as in Example 1, and the results are shown in Table 1.

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Abstract

Disclosed are: a propylene resin composition for a stretched sheet having excellent stiffness, heat resistant stiffness, transparency, uniform stretchability and thermal moldability; and a stretched sheet and a thermally molded article, each of which comprises the resin composition. The propylene resin composition for a stretched sheet comprises 10 to 90 wt% of a high-melting-point propylene resin (A') having a melting point of 156 to 170 DEG C as measured by DSC and 10 to 90 wt% of at least one low-melting-point propylene resin (A'') having a melting point of 70 to 155 DEG C as measured by DSC (provided that the total amount of the components (A') and (A'') is defined as 100 wt%), and fulfils the following requirements [1] to [4]: [1] the propylene resin composition has a melt flow rate (230 DEG C, 2.16 kg load) of 0.5 to 10.0 g / 10 min; [2] the propylene resin composition has a melting point of 150 to 170 DEG C as measured by DSC; [3] the propylene resin composition (A) contains an a-olefin comonomer at a content of 1 to 11 mol%; and [4] the propylene resin composition contains a nucleating agent.

Description

technical field [0001] The present invention relates to a propylene-based resin composition for a stretched sheet, a stretched sheet and a thermoformed article containing the resin composition. Background technique [0002] Highly transparent sheets are widely used as packaging materials for food, medical equipment, pharmaceuticals, electronic components, stationery, miscellaneous goods, and the like. As raw materials, biaxially oriented polystyrene (OPS) sheets, polyvinyl chloride (PVC) sheets or amorphous polyterephthalene Ethylene glycol formate (A-PET) sheet, etc. [0003] In recent years, from the viewpoints of environmental protection, heat-resistant rigidity, oil resistance, and low specific gravity, substitution to polypropylene sheets has been progressing. [0004] Since polypropylene has crystallinity, it becomes a translucent sheet as it is. Therefore, a method of adding a nucleating agent is known as a general method for improving transparency and rigidity (fo...

Claims

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Application Information

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IPC IPC(8): C08L23/10B32B27/32C08K5/00C08L23/14
CPCC08K5/0083C08L23/10B32B27/32C08L23/142
Inventor 木村孝志
Owner PRIME POLYMER CO LTD
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