Polypropylene resin composition for automotive material
A resin composition and polypropylene-based technology, applied in the field of polypropylene-based resin compositions for automotive materials, can solve the problems of no weld seam and the appearance of ripples, and achieve excellent appearance, less generation of weld seams and ripples, Good mechanical properties
Active Publication Date: 2010-10-06
PRIME POLYMER CO LTD
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Problems solved by technology
In Japanese Patent Laid-Open No. 2003-041088 (Patent Document 1), a material with excellent appearance properties such as weld seams and waves was developed from the viewpoint of corresponding to large molded products, but there is no appearance balance of weld seams and waves It cannot be said that sufficient appearance balance can be ensured
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1～4 and comparative example 1～4
[0173] Components (A-1) to (C) were dry-blended with a Henschel mixer at the compounding ratios shown in Table 1, melt-mixed at 200° C. using a twin-screw mixer, and then granulated to obtain granules of each composition. pellets. These composition pellets were used to form predetermined test pieces and square plates.
[0174] General mechanical properties were evaluated using test pieces obtained by usual molding. It was obtained that each standard satisfied the mechanical properties for use as an automotive material part. According to the above method, the weld seam disappearance rate (α) and the wave occurrence rate (β) are calculated from the weld seam and ripple appearance of the injection molded product, and α×β is obtained. Examples 1 to 4 satisfy 500≤α×β≤2000, A polypropylene-based resin composition having remarkably improved appearance properties was obtained.
[0175] On the other hand, in Comparative Examples 1 to 4, which are outside the composition range of the...
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Abstract
A resin composition which comprises: (A-1) 14-39 wt.% propylene block copolymer which has an MFR of 1-200 g / 10 min and comprises 70-95 wt.% room-temperature n-decane insolubles (Dinsol (1)) and 5-30 wt.% room-temperature n-decane solubles (Dsol (1)), the Dinsol (1) having an mmmm pentad content of 97% or higher and the Dsol (1) having a [eta] of 4-10 dL / g; (A-2) 20-60 wt.% propylene block copolymer which has an MFR of 1-200 g / 10 min and comprises 70-95 wt.% room-temperature n-decane insolubles (Dinsol (2)) and 5-30 wt.% room-temperature n-decane solubles (Dsol (2)), the Dinsol (2) having an mmmm pentad content of 97% or higher and the Dsol (2) having a [eta] of 1.5-4 dL / g; (B) 5-30 wt.% ethylene / alpha-olefin copolymer rubber; and (C) 10-30 wt.% inorganic filler. The polypropylene resin composition for automotive materials can give an injection-molded article which is excellent in rigidity and impact resistance, is reduced in weld and flow marks, and has an excellent appearance.
Description
technical field [0001] The present invention relates to a polypropylene-based resin composition for automotive materials comprising a specific polypropylene-based resin composition. More specifically, it relates to a polypropylene-based resin composition suitable for injection molded articles for automotive materials capable of obtaining injection molded articles having excellent rigidity, excellent impact resistance, less occurrence of weld seams and moiré, and excellent appearance. Background technique [0002] Polypropylene-based resin compositions are widely used as materials excellent in rigidity and heat resistance, and are also widely used as raw materials for automobile parts such as bumpers, instrument panels (dashboards), door trims, and pillars. When used as parts for automotive materials, it is necessary to improve the impact resistance while being excellent in general properties such as rigidity, heat resistance, and light resistance. Segment copolymers, or eth...
Claims
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IPC IPC(8): C08L53/00C08L23/12C08K3/00C08L23/08
CPCC08F297/08C08L23/10C08F297/083C08L53/00C08L23/12C08L23/0815C08L2666/02C08L2666/24C08L2666/04
Inventor 塚原义晓酒井郁典杉本吉男桐荣聪子藤山则昭
Owner PRIME POLYMER CO LTD