Propylene random block copolymer, resin composition containing the copolymer and molded article made thereof

A technology of propylene-based resin and block copolymer, which is applied in the field of polypropylene resin composition and propylene-based random block copolymer, which can solve the problem of low molecular weight, high rigidity, difficulty in imparting impact resistance, tear strength, etc. Problems, to achieve the effect of excellent film forming, excellent heat shrinkability, excellent impact resistance

Active Publication Date: 2009-04-15
MITSUI CHEM INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the propylene-based random block copolymers disclosed in the above-mentioned publications are propylene-based random block copolymers excellent in characteristics such as low molecular weight, high rigidity, and blocking properties of the propylene-ethylene copolymer elastomer produced in the second step utilizing various catalyst properties. In a state similar to the properties of random block copolymers, it is difficult to impart physical properties such as impact resistance and tear strength

Method used

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  • Propylene random block copolymer, resin composition containing the copolymer and molded article made thereof
  • Propylene random block copolymer, resin composition containing the copolymer and molded article made thereof
  • Propylene random block copolymer, resin composition containing the copolymer and molded article made thereof

Examples

Experimental program
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Embodiment

[0133] Hereinafter, the present invention will be described in detail based on examples, but the present invention is not limited to these examples. However, the physical property measurement methods in Examples and Comparative Examples are as follows.

[0134] (m1) MFR (melt flow rate)

[0135] MFR is measured in accordance with ASTM D1238 (230° C., load 2.16 kg).

[0136] (m2) Melting point (Tm)

[0137] Measurement was performed using a differential scanning calorimeter (DSC, manufactured by PerkinElmer). The endothermic peak at the third stage measured here is defined as melting point (Tm).

[0138] (measurement conditions)

[0139] The first stage: heat up to 240°C at 10°C / min and keep for 10min.

[0140] Stage 2: Cool down to 60°C at 10°C / min.

[0141] The third stage: heating up to 240°C at 10°C / min.

[0142] (m3) The amount of n-decane soluble part at room temperature (D sol )

[0143] 200 ml of n-decane was added to a 5 g sample of the final product ...

manufacture example 1

[0201] (1) Manufacture of solid catalyst carrier

[0202] Sample 300 g of SiO in a 1 liter distillation flask 2 , Add 800ml of toluene to make slurry.

[0203] Next, the slurry was transferred to a 5-liter 4-necked flask, and 260 ml of toluene was added thereto.

[0204] 2830 ml of methylaluminoxane (hereinafter referred to as MAO)-toluene solution (manufactured by ALBEMARLE, 10% by weight solution) was introduced thereinto, and kept stirring at room temperature for 30 minutes. The temperature was raised to 110° C. over 1 hour, and the reaction was carried out for 4 hours. After the reaction, cool to room temperature. After cooling, the supernatant toluene was taken out and replaced with new toluene until the replacement rate was 95%.

[0205] (2) Production of solid catalyst components (loading of metal catalyst components on carriers)

[0206] In the glove box, weigh 2.0 g of diphenylmethylene (3-tert-butyl-5-methylcyclopentadienyl) synthesized according to the record o...

manufacture example 2

[0219] It carried out by the method similar to manufacture example 1 except having changed the polymerization method as follows.

[0220] (1) Main aggregation

[0221] Continuously feed propylene at 40 kg / hour, hydrogen at 5 N liters / hour, and catalyst slurry produced in (3) of Production Example 1 as a solid catalyst component at a rate of 40 kg / hour to a tubular polymerizer having an internal volume of 58 liters. , 2.2 g / hour of triethylaluminum was supplied, and polymerization was carried out in a liquid-filled state in which no gas phase existed in the tubular polymerizer. The temperature of the tubular reactor was 30° C. and the pressure was 3.2 MPa / G. The catalyst in this reaction is a M1 type catalyst.

[0222] The resulting slurry was sent to a vessel polymerizer with an inner volume of 1,000 liters with a stirrer, and further polymerized. To the polymerizer, propylene was supplied at 45 kg / hour, ethylene was supplied so that the ethylene concentration in the gas ph...

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Abstract

The invention provides a propylene random block copolymer (A) that has a melt flow rate from 0.1 to 100 g / 10 min and a melting point from 100 to 155 DEG C and includes 90 to 60% by weight of a portion insoluble (D insol ) in n-decane at room temperature and 10 to 40% by weight of a portion soluble (D sol ) in n-decane at room temperature, wherein the D insol satisfies the following requirements (1) through (3) and the D sol satisfies the following requirements (4) through (6). The invention further provides molded articles such as sheets, films, injection molded articles, hollow molded articles, injection blow molded articles and fibers, which are formed of the propylene random block copolymer (A) or a propylene resin composition containing the propylene random block copolymer (A). (1) The molecular weight distribution (Mw / Mn) obtained by GPC of the D insol is from 1.0 to 3.5, (2) the content of skeletons derived from ethylene in the D insol is from 0.5 to 13% by mole, (3) the total amount of 2,1- and 1,3-propylene units in the D insol is 0.2% by mole or less, (4) the molecular weight distribution (Mw / Mn) obtained by GPC of the D sol is from 1.0 to 3.5, (5) the intrinsic viscosity [] in decalin at 135 DEG C of the D sol is from 1.5 to 4 dl / g and (6) the content of skeletons derived from ethylene in the D sol is from 15 to 35% by mole.

Description

technical field [0001] The present invention relates to a propylene-based random block copolymer, a polypropylene resin composition containing the copolymer, and a molded article formed therefrom. Background technique [0002] In general, polypropylene resins are used in a wide variety of applications because they are excellent in chemical properties, physical properties, and moldability, and are inexpensive. For example, a propylene-based random copolymer produced by copolymerizing propylene and ethylene using a Ziegler-Natta catalyst is used as a heat seal for food packaging because of its excellent transparency, light weight, flexibility, and heat resistance. Film and sheet materials such as film and shrink film, injection molding applications such as clothing boxes, food containers, and medical containers, hollow molded products such as household detergent containers, injection stretch molded products such as beverage containers and seasoning containers, etc. However, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F297/08C08L53/00
CPCC08F297/083C08L23/142C08L2207/02C08F4/65912C08F4/65916C08F210/06C08F110/06C08L23/16C08F4/65927C08F4/6492C08F2/001C08F4/6543C08F4/6465C08F210/16C08F210/08C08F2500/12C08F2500/26C08F2500/17C08F2500/27C08F2500/31C08F2500/34C08F2500/03C08F297/08C08L53/00C08J5/00
Inventor 板仓启太桥诘聪武居邦彦船谷宗人
Owner MITSUI CHEM INC
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