摘要:
A thermoplastic resin composition which has a melt flow rate of 20 to 30 g/10 min and a flexural modulus at 23°C of 30,000 kg/cm 2 or more and which comprises (A) 60 to 75% by weight of a specific crystalline polypropylene in which the propylene homopolymer portion has a Q value of 3.0 to 5.0, an isotactic pentad fraction of 0.975 or more and an intrinsic viscosity [η] of 0.95 to 1.15 dl/g as measured at 135°C in tetralin, (B) 2 to 8% by weight of an ethylene-butene-1 copolymer rubber, (C) 2 to 8% by weight of an ethylene-propylene copolymer rubber, (D) 10 to 20% by weight of talc having an average particle diameter of 4 µm or less, and (E) 5 to 20% by weight of fibrous magnesium oxysulfate, and an injection molded article of the thermoplastic resin composition, said thermoplastic resin composition satisfying the impact strength and rigidity required as a material for an instrumental panel and having a short molding cycle and good surface quality.
摘要:
A thermoplastic resin composition which has a melt flow rate of 25 to 30 g/10 min and a flexural modulus at 23°C of 20,000 kg/cm 2 or more and which comprises (1) 78 to 87% by weight of a specific crystalline polypropylene [referred to hereinafter as (A)] in which the propylene homopolymer portion has a Q value of 3.0 to 5.0, an isotactic pentad fraction of 0.975 or more and an intrinsic viscosity [η] of 1.00 to 1.10 dl/g as measured at 135°C in tetralin, (2) 3 to 10% by weight of at least two specific rubber components selected from the group consisting of (B) 1 to 9% by weight of an ethylene-butene-1 copolymer rubber, (C) 1 to 9% by weight of an ethylene-propylene copolymer rubber and (D) 1 to 9% by weight of an alkenyl aromatic compound-containing rubber; and (3) 10 to 12% by weight of talc having an average particle diameter of 4 µm or less, and an injection molded article of the thermoplastic resin composition, said thermoplastic resin composition satisfying the impact strength and rigidity required as a material for an interior automotive trim and having a short molding cycle and good surface quality.
摘要:
A thermoplaslic polymer composition comprising: (i) 100 parts by weight of a thermoplastic polymer component which comprises an ethylene-propylene rubber, an ethylene copolymer and a propylene polymer (including an ethylene-propylene block copolymer), and (ii) 7 to 25 parts by weight of talc, the thermoplastic polymer component being composed of, according to fractionation using o-dichlorobenzene as a solvent, component (A) which is a component soluble in the solvent at 40°C, component (B) which is a component insoluble in the solvent at 40°C but soluble at 110°C, and component (C) which is a component insoluble in the solvent even at 110°C in such a proportion that the total amount of the components (A) and (B) is from 50 to 70 parts by weight, the weight ratio of the component (A) to the component (B) being from 0.5 to 1.5, and the amount of the component (C) is from 50 to 30 parts by weight; said composition having a flexural modulus of 10,000 to 20,000 kg/cm².
摘要:
There is disclosed a thermoplastic resin composition comprising a blend of
100 parts by weight of a resin composition composed of 1 to 99% by weight of a polypropylene type resin (C) selected from the group consisting of a modified polypropylene (A) obtained by graft copolymerizing an unsaturated carboxylic acid or a derivative thereof and an unsaturated aroamtic monomer onto polypropylene, and a composition composed of the modified polypropylene (A) and a polypropylene (B), and 99 to 1% by weight of at least one sturated polyester resin (D), 0.1 to 300 parts by weiht of an epoxy group containing copolymer (E), 0.1 to 300 parts by weight of a modified ethylenic copolymer ruber (F) obtained by graft copolymerizing and an unsaturated carboxylic acid or a derivative thereof and an unsaturated aromatic monomer onto ethylenic copolymer ruber, and Up to 5 partsg by weight of a basic comdpound (G) optionally added as reaction accelerator, the content of the saturted polyester resin in the thermoplastic polyeste4r resin being less than 50% by weight.
The thermoplastic resin composition of the present invention has high heat resistance and high impact resistance. in particular, high low-temperatuer impact resistance and is advantgeously used in automobilde parts, electric and electronic parts, etc.
摘要:
This invention provides polypropylene resin compositions exhibiting a strongly improved balance of physical properties in comparison to related polypropylene materials. The materials can be used in both interior and exterior parts of automobiles, have excellent thin-wall moldability and can effectively reduce generation of flow marks. Particularly, it provides a polypropylene resin composition which comprises specified amounts of (A) a specific ethylene-propylene block copolymer, (B) a specific thermoplastic elastomer and (C) talc, wherein it has specified values of physical properties measured by ASTM and has a degree of b-axis orientation of 720 or more which is calculated from the ratio of differential peak intensities measured by wide-angle X-ray diffraction of the central area of an ASTM No. 1 dumbbell prepared by injection molding.
摘要:
A polypropylene resin composition for use in automotive inner and outer trims, comprising: 50 to 85% by weight of a crystalline polypropylene (A) having a melt flow rate (at 230°C under a load of 2.16 kg) of 7 to 70 g/10 min, 2 to 16% by weight of a hydrogenated block copolymer (B) which is obtainable by hydrogenating at a hydrogenation ratio of at least 90% an aromatic vinyl/conjugated diene block copolymer, containing 22% by weight or less of aromatic vinyl polymer block(s) and which has a melt flow rate (at 230°C under a load of 2.16 kg) of at least 5 g/10 min, 0 to 16% by weight of a hydrogenated block copolymer (C) which is obtainable by hydrogenating at a hydrogenation ratio of at least 90% an aromatic vinyl/conjugated diene block copolymer, containing at least 25% by weight of aromatic vinyl polymer block(s) and which has a melt flow rate (at 230°C under a load of 2.16 kg) of 10 g/10 min or less, 0 to 10% by weight of an aromatic hydrocarbon copolymer (D), 0 to 10% by weight of a crystalline polyethylene (E), 0 to 10% by weight of a soft ethylene/α-olefin copolymer (F), and 5 to 25% by weight of an inorganic filler (G) having an average particle size of 0.1 to 3µm.