Thermoplastic resin composition and its injection shaped products

A technology of thermoplastic resin and composition, which is applied in the field of molded products with flow marks and injection molded products, and can solve the problems of low intrinsic viscosity, poor appearance of molded products, and unsatisfactory appearance of molded products, etc.

Inactive Publication Date: 2004-06-16
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, gas phase produced ethylene-propylene block copolymers contain low intrinsic viscosity [η] EP The ethylene-propylene copolymer portion of
Therefore, the above-mentioned block copolymers generally have problems of low expansion ratio (SR), generation of unsatisfactory flow marks and poor appearance of molded articles made therefrom
Moreover, it is produced by the gas phase method and has a high intrinsic viscosity [η EP ] When ethylene-propylene block copolymers are used, small bags are generated, resulting in molded articles with poor appearance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0052] Known polymerization processes for the preparation of propylene-based polymers can be applied to the preparation of the propylene-based polymer components (I) and (II). For example, polymerization methods such as bulk polymerization, solution polymerization, and slurry polymerization, and gas phase polymerization can be used. Polymerization can be carried out batchwise or continuously. A combination of batch mode and continuous mode can also be used. Preference is given to continuous gas phase polymerization. As disclosed in US Patent Application Publication No. 2003-0055172-A1, a catalyst system comprising a solid phase catalyst component, an organoaluminum compound and an electron donating component can be used for two-stage polymerization. The contents of the solid-phase catalyst component, the organoaluminum compound and the electron-donating component and the method of introducing these components into the polymerization reactor can be correctly determined with r...

Embodiment

[0072] The present invention is described by way of examples and comparative examples. However, the present invention is not limited to these Examples.

[0073] Components used in Examples and Comparative Examples are as follows.

[0074] (1) Polypropylene resin (A)

[0075] COSMOPLENE AZ564G (a crystalline ethylene-propylene block copolymer) manufactured by Polyolefin Corporation

[0076] (2) Elastomer (B)

[0077] Engage EG8842 (an ethylene-octene copolymer) manufactured by Dupont Dow Elastomers L.L.C.

[0078] (3) Inorganic filler (C)

[0079] Talc manufactured by Hayashi Kasei Co., MW HS-T

[0080] (4) Resin (D)

[0081] The melt tension (MT) of the resin (D) measured at 190° C. at a winding speed of 15.7 m / min was 0.31 N. For the swell measured at 220°C at a pore L / D of 40, the resin is at a shear rate of 1.2×10 3 sec -1 The swell ratio (SR) measured below was 2.1. The time taken until the ratio (G(t) / G(0.02)) of the relaxation modulus G(t) measured at 210°C to ...

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Abstract

Disclosed is a thermoplastic resin composition comprising specific amounts of (A) a polypropylene resin, (B) an elastomer, (C) inorganic filler, (D) a resin having a melt tension of 0.1 N or more and a swelling ratio of 1.8 or more and being characterized by that the time required for the resin until the ratio (G(t) / G(0.02)) of a relaxation modulus G(t) measured at 210 DEG C. to a relaxation modulus G(0.02) at a time of 0.02 sec reaches 0.01 is 10 sec or more, and (E) a resin characterized by that, with respect to a swelling ratio measured at 220 DEG C. at an L / D of an orifice of 40, the ratio of a swelling ratio (SR10<3>) at a shear rate of 2.4x10<3 >sec<-1 >to a swelling ratio. (SR10<2>) at a shear rate of 1.2x10<2 >sec<-1>, SR10<3> / SR10<2>, is from 1.0 to 1.1.

Description

technical field [0001] The present invention relates to a thermoplastic resin composition excellent in rigidity, impact resistance and fluidity, from which molded articles having good appearance, especially satisfactory flow marks, can be obtained. Furthermore, the present invention relates to an injection-molded article containing the above-mentioned thermoplastic resin composition. Background technique [0002] Polypropylene-based resins have been widely used in materials requiring properties such as high rigidity and high impact strength. Polypropylene-based resins have recently found widespread use, especially as automotive materials. In particular ethylene-propylene block copolymers are used more and more. Although ethylene-propylene block copolymers have traditionally been produced by the solvent process, these copolymers have recently been produced by the continuous gas phase process, which involves simple processes and low cost to prepare the above copolymers. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/00C08K3/00C08L23/08C08L23/10C08L53/00
CPCC08L23/0815C08L53/00C08L23/10C08L2666/06
Inventor 大川健一下条盛康
Owner SUMITOMO CHEM CO LTD
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