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Polypropylene-based resin composition and its molded product

A resin composition, polypropylene-based technology, applied in the direction of coating, etc., can solve the problems such as the impact resistance needs to be further improved, the impact resistance is insufficient, insufficient, etc.

Inactive Publication Date: 2006-09-06
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the extensibility of the polypropylene resin composition disclosed in the above-mentioned JP60-58459A, which is a factor of formability, rigidity and impact resistance, especially impact resistance, is insufficient because an ethylene-propylene copolymer is used Rubber, these physical properties need to be improved
Moreover, the impact resistance of the polypropylene resin composition disclosed in the above-mentioned JP7-33919A is insufficient, because 50-98% by weight of a high crystallinity polypropylene homopolymer is used, and its impact resistance needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The production method of the copolymer (A-1) is not particularly limited, and includes wherein a propylene homopolymer part as the first segment is prepared in the first step, and propylene as the second segment is prepared in the second step— Ethylene Random Copolymer Partial Method.

[0023] Furthermore, mention may also be made of a method in which the copolymer is prepared by a known polymerization method using a known polymerization catalyst. Well known polymerization catalysts include Ziegler catalysts and metallocene catalysts. Known polymerization methods include, for example, slurry polymerization and gas phase polymerization.

[0024] As the propylene homopolymer (A-2) used in the present invention, the same propylene homopolymer as the above-mentioned propylene homopolymer as the first segment of the propylene-ethylene block copolymer (A-1) used in the present invention can be used. thing.

[0025] The α-olefins with 4-20 carbon atoms used in the copolymer...

Embodiment 1、2 and comparative example 1 to 3

[0108] (Polypropylene-based resin composition)

[0109] A polypropylene-based resin composition was prepared in the following manner. Propylene-ethylene block copolymer (BC-1), propylene homopolymer (PP-1), ethylene-1-octene copolymer rubber (EOR-1) and talc (talc- 1) uniformly premixed with the composition shown in Table 1, then with a twin-screw extruder (model TEX44SS-31.5BW-2V, manufactured by Japan Steel Works, Ltd.), with the screw speed of 50kg / hr extrusion speed and 900rpm at The polypropylene-based resin composition was prepared under bent suction. The MFR of the obtained polypropylene-based resin composition was measured. The results are shown in Table 2.

[0110] (injection molded products)

[0111] Specimens for evaluation of physical properties were prepared under the following injection molding conditions. After drying in a hot air dryer at 120°C for 2 hours, use an injection molding machine model IS150E-V manufactured by TOSHIBA MACHIN Co., Ltd. at a moldin...

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PUM

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Abstract

Disclosed are a polypropylene-based resin composition comprising 100 parts by weight of a resin comprising from 75 to 95% by weight of a propylene-ethylene block copolymer (A-1) and from 5 to 25% by weight of a copolymer rubber of ethylene and alpha-olefin having from 4 to 20 carbon atoms (B) and from 0.3 to 2 parts by weight of talc (C), and a polypropylene-based resin composition comprising 100 parts by weight of a resin comprising from 55 to 94% by weight of a propylene-ethylene block copolymer (A-1), from 1 to 20% by weight of a propylene homopolymer (A-2) and from 5 to 25% by weight of a copolymer rubber of ethylene and alpha-olefin having from 4 to 20 carbon atoms (B) and from 0.3 to 2 parts by weight of talc (C).

Description

technical field [0001] The present invention relates to a polypropylene-based resin composition and an injection-molded product thereof, more particularly to a polypropylene-based resin composition with excellent extensibility and an injection-molded product thereof, wherein extensibility is a factor of formability, rigidity and impact resistance, Especially the factor of impact resistance. Background technique [0002] In recent years, polypropylene resins are often used as materials for automobiles and home appliances, which are required to be lightweight, formable, and excellent in rigidity and impact resistance. A method involving adding an inorganic filler is generally known as a method of improving rigidity. A method involving adding a rubber component is a known method of improving impact resistance. In addition, a method of using a large MFR is a known method of improving formability. [0003] For example, JP60-58459A discloses a polypropylene resin composition wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/14B29C45/00C08L23/08C08L23/12C08L53/00
CPCC08L23/12C08L23/08C08L23/0815C08L53/00C08L2666/04
Inventor 渡边毅大川健一
Owner SUMITOMO CHEM CO LTD