Polypropylene resin composition
AssigneeHyundai Motor Company
InventorsKieyoun Jeong, Seung-Wook Lee, Seung-Wook Hwang
Life of this patent
Estimating the term…
Abstract
A polypropylene resin composition for automobile interior materials, more particularly to a polypropylene resin composition including a crystalline polypropylene and rubber mixture wherein inorganic filler, atactic polypropylene and process oil are added to offer good flexibility, heat-resistance, cold-resistance, extrusion coating property and calender processing property and to remove offensive odor, which is specially useful for back coat of automobile mats.
Claims20
A polypropylene resin composition that contains:
- (A) 1-30 parts by wt of atactic polypropylene comprising propylene monopolymer or bipolymer of propylene and 1-20 wt % of C210 α-olefin;
- (B) 10-20 parts by wt of crystalline polypropylene comprising propylene monopolymer or bipolymer of propylene and 1-25 wt % of C2-10 α-olefin;
- (C) 30-70 parts by wt of ethylene-α-olefin copolymer rubber comprising a bipolymer of ethylene and 25-60 wt % of C2-10 α-olefin;
- (D) 1-30 parts by wt of process oil, having 10-800 cSt (40° C.) of kinematic viscosity, selected from paraffinic oil, aromatic oil and naphthenic oil;
- and
- (E) 1-20 parts by wt of inorganic filler selected from talc, calcium carbonate, calcium sulfate, magnesium oxide, calcium stearate, mica, silica, calcium silicate, clay and carbon black.
A polypropylene resin composition comprising:
- (A) between about 10 and about 30% by weight of atactic polypropylene having a Pentad isotactic index lower than about 30 and a weight-average molecular weight of between about 20,000 to about 200,000 g/mol;
- (B) between about 10 to about 20% by weight of crystalline polypropylene having a melt index of from about 0.5 to about 10 g/10 min at 230° C. and a weight-average molecular weight greater than 150,000 g/mol;
- (C) between about 30 to about 60% by weight of ethylene-α-olefin copolymer rubber, wherein the amount of (A) atactic polypropylene and (C) ethylene-α-olefin copolymer rubber together is between about 50% and about 70%;
- (D) between about 10 to about 30% by weight of process oil comprising paraffinic processing oil and having a kinematic viscosity of 10-800 cSt at 40° C.;
- (E) between about 5 to about 20% by weight of a filler with a particle size below about 20 μm, wherein the hardness of the cured polypropylene resin composition is less than 50 Shore A.
A polypropylene resin composition comprising:
- 1-30 parts by wt of atactic polypropylene comprising propylene monopolymer or bipolymer of propylene and 1-20 wt % of C2-10 α-olefin and having a Pentad isotactic index lower than about 30 and a weight-average molecular weight of between about 20,000 to about 200,000 g/mol;
- 30-70 parts by wt of ethylene-α-olefin copolymer rubber comprising a bipolymer of ethylene and 25-60 wt % of C210 α-olefin;
- 1-30 parts by wt of process oil having 10-800 cSt (40° C.) of kinematic viscosity;
- and
- 1-20 parts by wt of inorganic filler selected from talc, calcium carbonate, calcium sulfate, magnesium oxide, calcium stearate, mica, silica, calcium silicate, clay and carbon black.
Dependencies are inferred from the claim text.