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Method for producing resin composition

A technology of resin composition and manufacturing method, which is applied in the field of manufacturing molded products, can solve the problems of increased melt viscosity, difficulty in use, failure to obtain good molded products, etc., and achieves excellent wear resistance and excellent melt formability Effect

Active Publication Date: 2010-06-02
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Since the resin composition described in Patent Document 1 is cross-linked, an increase in melt viscosity is unavoidable, and it may become difficult to use when adopting a molding method that requires high melt fluidity.
For example, good molded products may not be obtained when high-speed injection molding, when injection molding large molded products, when injection molding molded products that require strict dimensional accuracy, etc.

Method used

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  • Method for producing resin composition
  • Method for producing resin composition
  • Method for producing resin composition

Examples

Experimental program
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Embodiment 1

[0160] Raw materials (A) to (D) used in this example are as follows.

[0161] Cyclic olefin polymer (A):

[0162] Ethylene and tetracyclines [4.4.0.1 2，5 .1 7，10 ]-3-dodecene (hereinafter sometimes abbreviated as "TCD-3") random copolymer (ethylene-TCD-3 random copolymer). The ethylene content measured by 13C-NMR was 62 mol%, the intrinsic viscosity [η] measured in decahydronaphthalene at 135°C was 0.60 dl / g, and the glass transition temperature (Tg) was 105°C. The MFR measured at 230° C. (measured under a load of 2.16 kg according to ASTM D1238) was 8.2 g / 10 minutes. The structural formula of TCD-3 is as follows.

[0163]

[0164] ·Soft polymer (B):

[0165] Mitsui Chemicals Co., Ltd. ethylene-propylene random copolymer "P-0880". The ethylene content is 80 mol%, the glass transition temperature (Tg) is -54°C, the MFR (measured at 230°C under a load of 2.16kg according to ASTM D1238) is 0.4g / 10min, and [η] is 2.5dl / g, The density is 0.867g / cm 3 , the degree of cryst...

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Abstract

Disclosed is a method for producing a resin composition wherein a cyclic olefin polymer (A) having a glass transition temperature of 60-200 DEG C and a soft polymer (B) having a glass transition temperature of not more than 0 DEG C are melt-mixed. In this method, a part of the cyclic olefin polymer (A) and the soft polymer (B) together with a radical initiator (C) are melt-mixed in advance, and then the rest of the cyclic olefin polymer (A) is added thereto for melt-mixing. By adding the cyclic olefin polymer (A) in two additions, a mixture having a crosslinked structure can be diluted with the cyclic olefin polymer (A) having no crosslinked structure, thereby suppressing increase in the melt viscosity. Consequently, there can be obtained a resin composition which is excellent in wear resistance and melt moldability.

Description

technical field [0001] The present invention relates to a method for producing a resin composition, in particular to a method for producing a resin composition obtained by melt-kneading a cyclic olefin polymer, a soft polymer, and a radical initiator. Moreover, it also relates to the manufacturing method of the molded article of the resin composition like injection molding. Background technique [0002] Cyclic olefin polymers are excellent in chemical resistance, heat resistance, weather resistance, etc., and have good dimensional accuracy and rigidity of molded products, so they are used as molded products for various purposes. Furthermore, a soft polymer may be blended with the cyclic olefin polymer for the purpose of improving impact resistance or the like. [0003] Patent Document 1 describes a crosslinked impact-resistant cyclic olefin-based resin composition comprising a reaction product of an ethylene component and a cyclic olefin component having a softening tempera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L45/00C08L25/10C08L23/08C08L65/00C08L23/16C08K5/00C08L53/02
CPCC08K5/14C08L65/00C08J2345/00C08L45/00C08J3/005C08J2365/00C08L2666/02C08L23/16
Inventor 金子和义广瀬敏行
Owner MITSUI CHEM INC
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