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Polymer composition, process for producing the polymer composition, and molded articles for automobile exterior trim

A technology of polymers and compositions, which is applied in the field of molded products and preparation of polymer compositions, and can solve problems such as performance degradation, difficulty in controlling the fluidity of polymer compositions, and molecular weight reduction.

Inactive Publication Date: 2006-10-25
MITSUI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, this method has a problem that during melt blending, crosslinking or side reactions such as molecular weight drop occur, making it difficult to control the fluidity of the polymer composition
Dynamic crosslinking of blends with higher proportions of rubber phase (>60%) improved tear and abrasion resistance, but blends with high proportions of plastic phase showed a decrease in performance due to degradation of (I) phase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9 and comparative example 1-7

[0254] Components used in Examples and Comparative Examples are as follows. The melt viscosity (JAI 7-1991) is a value measured at 80°C using a BrookField viscometer 5XLVDV-II+ (manufactured by US Brook Field Engineering Laboratories).

[0255] Component (A)

[0256] (a-1): Ethylene / vinyl acetate copolymer

[0257] Vinyl acetate content 19% by weight

[0258] MFR (JIS K7210-1999, 190°C, 2160g load) is 15g / 10min

[0259] (a-2): Ethylene / vinyl acetate copolymer

[0260] Vinyl acetate content 33% by weight

[0261] MFR (JIS K7210-1999, 190°C, 2160g load) is 14g / 10min

[0262] (a-3): Ethylene / vinyl acetate copolymer

[0263] Vinyl acetate content 41% by weight

[0264] MFR (JIS K7210-1999, 190°C, 2160g load) is 65g / 10min

[0265] (a-4): Ethylene / methacrylic acid copolymer

[0266] methacrylic acid content of 9% by weight

[0267] MFR (JIS K7210-1999, 190°C, 2160g load) is 12g / 10min

[0268] (a-5): Ethylene / methyl acrylate copolymer

[0269] Methyl acrylate content is 2...

Embodiment 10 and 11， comparative example 8 and 9

[0320] Compositions tested in Examples and Comparative Examples are as follows.

[0321] Component (A1)

[0322] (a-6): Ethylene / vinyl acetate copolymer

[0323] Vinyl acetate content 10% by weight

[0324] MFR (JIS K7210-1999, 190°C, 2160g load) is 20g / 10min

[0325] Component (A2)

[0326] (a-7): Ethylene / vinyl acetate copolymer

[0327] Vinyl acetate content 33% by weight

[0328] MFR (JIS K7210-1999, 190°C, 2160g load) is 31g / 10min

[0329] Component (B)

[0330] (b-6): Three-component propylene random copolymer

[0331] Propylene content is 93.5 mol%

[0332] Ethylene content is 3 mol%

[0333] Butene content is 3.5 mol%

[0334] Melt viscosity (JAI 7-1991, 180°C) is not less than 1,000,000mPa·s

[0335] MFR (ASTM D 1238, 230°C, 2160g load) is 7.2g / 10min

[0336] Organic peroxide (C)

[0337] (c-1): 2,5-Dimethyl-2,5-di(t-butylperoxy)hexane (trade name; Luperox 101, manufactured by ATOFINAYOSHITOMI, Ltd.)

[0338] In each embodiment, the above components were...

Embodiment 12

[0353] Dynamic heat treatment of propylene and ethylene copolymers with a melting point of 142 ° C and ethylene copolymers with 35% methyl acrylate (by tubular high pressure method, in a ratio of 20:80, in Luperox 101 (2,5-dimethyl-2, 5-di(tert-butylperoxy)hexane, manufactured by ATOFINA YOSHITOMI, 1td.) was prepared in the presence of crosslinking agent and ethylene glycol dimethacrylate as coagent to obtain polymer composition Prior to preparation, Luperox 101 was impregnated onto the ethylene / methyl acrylate copolymer particles at a concentration of 1.6%.

[0354] A polymer composition was obtained using a 30 mm twin-screw extruder as follows. Ethylene copolymer is fed into the extruder at a controlled rate for melt blending, after which liquid additives are injected and then mixed with the copolymer. From a controlled feeder, the propylene copolymer is then fed into the extruder and a ram stuffer on the extruder side. The melt temperature prior to this was about 150°C. ...

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Abstract

The partially cross-linked polymer composition of the present invention is obtainable by dynamically heat-treating: 95 to 50 % by weight of a resin (A) comprising an ethylene copolymer containing 5 to 48 % by weight of units derived from at least one monomer selected from vinyl acetate, (meth)acrylic acid, (meth)acrylate ester, glycidyl (meth)acrylate and carbon monoxide, and 5 to 50 % by weight of a resin (B) having a melt viscosity (JAI 7-1991) at 180oC of over 10,000 mPa.s and comprising a two or more-component propylene copolymer containing 0.1 to 20 % by mol of units derived from a-olefins other than propylene, or a blend of the two or more-component propylene copolymer and a propylene homopolymer in the presence of an organic peroxide (C) in an amount of from 0.001 to 4 parts by weight based on 100 parts by weight of the total amount of the resins (A) and (B). The invention can provide the polymer compositions having excellent fluidity and productivity, which allow to produce molded articles with heat resistance, adhesion with paint, tensile strength, flexibility, stress crack resistance, and RF weldability, such as molded articles for automobile exterior trim, and can provide the process for producing the polymer compositions.

Description

technical field [0001] The present invention relates to a polymer composition having various excellent properties inherent in ethylene copolymers and flow properties suitable for molding processing, and having improved heat resistance. The invention also relates to a process for the preparation of the composition and molded articles for automotive exterior decoration. More particularly, the present invention relates to polymer compositions having excellent flow properties and productivity, which can produce polymers having excellent heat resistance, good adhesion to paints, tensile strength, flexibility, molding processability , Stress crack resistance and RF (radio frequency) weldability of molded products. It also relates to a process for the preparation of the polymer composition and molded articles for automotive exteriors molded from the polymer composition. Background technique [0002] Ethylene copolymers have excellent properties and have been widely used as variou...

Claims

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Application Information

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IPC IPC(8): C08L23/08
Inventor 中田一之武田紀彦前田敏幸D.J.沃尔什H.V.本德尔
Owner MITSUI LTD
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