摘要:
An object of the present invention is to provide a coated polypropylene-based molded article having an excellent gas barrier property. A coated polypropylene-based molded article according to the present invention includes a molded article formed of a polypropylene-based resin composition and a thin film formed on a surface of the molded article, the polypropylene-based resin composition includes a polypropylene-based resin (D) and a nucleating agent (C), the content of the nucleating agent (C) is from 0.05 to 0.5 parts by mass with respect to 100 parts by mass of the polypropylene-based resin (D).
摘要:
A long-fiber-reinforced resin composition including (A) a long-fiber-reinforced thermoplastic resin pellet including a thermoplastic resin, a modified polyolefin-based resin modified with an unsaturated carboxylic acid or its derivative and reinforcing fiber and satisfying (A-1) the melt index of the thermoplastic resin is 100-250 g/10 min, (A-2) the relaxation time λ of the thermoplastic resin is 0.1 (sec) or less, (A-3) the content of the reinforcing fiber is 40-70 wt %, and (A-4) the content of the modified polyolefin-based resin is 1-5 wt %; and (B) a polyolefin-based resin satisfying (B-1) the melt index of the polyolefin-based resin is 20-70 g/10 min, and (B-2) the relaxation time λ of the polyolefin-based resin is 0.23 (sec) or less; wherein the content of reinforcing fiber contained in (A) is 20-60 wt % relative to the total amount of the fiber-reinforced resin composition.
摘要:
[Problem] To provide polypropylene for a microporous film having excellent heat resistance and strength. [Solution] Polypropylene for a microporous film satisfying the following requirements (1) and (2): (1) the weight-average molecular weight (Mw) value, as determined by gel permeation chromatography (GPC), is not less than 100,000 but less than 800,000, the value (Mw/Mn) obtained by dividing the weight-average molecular weight by the number-average molecular weight is more than 7.0 but not more than 12.0, and the value (Mz/Mw) obtained by dividing the Z-average molecular weight by the weight-average molecular weight is not less than 3.8 but not more than 9.0, and (2) the mesopentad fraction, as measured by 13C-NMR (nuclear magnetic resonance method), is not less than 95.5%.
摘要:
A blow molding ethylene resin composition satisfies the following requirements [a], [b], [c] and [d] at the same time: [a] the melt flow rate (MFR) at a temperature of 190° C. under a load of 21.6 kg is in the range of 1.0 to 15 g/10 min; [b] the density is in the range of 955 to 970 kg/m3; [c] the number of methyl branches per 1000 carbon atoms is less than 0.1 according to 13C-NMR; [d] the tensile impact strength measured at −40° C. in accordance with JIS K 7160 is not less than 270 kJ/m2.
摘要翻译:吹塑乙烯树脂组合物同时满足以下要求[a],[b],[c]和[d]:[a]在190℃下的熔体流动速率(MFR) 21.6kg的负载在1.0〜15g / 10min的范围内; 密度在955至970kg / m3之间; [c]根据13 C-NMR,每1000个碳原子的甲基支链数小于0.1; [d]根据JIS K 7160在-40℃下测量的拉伸冲击强度不小于270kJ / m 2。
摘要:
[Object] To provide a polypropylene resin composition for use in the formation of a microporous membrane having excellent heat resistance and strength.[Solution] A polypropylene resin composition for use in the formation of a microporous membrane according to the present invention comprises as an essential component an ultra-high-molecular-weight propylene homopolymer (A) that satisfies the following requirements (1) to (4): (1) the intrinsic viscosity [η] is 7 dl/g or more and less than 25 dl/g; (2) the mesopentad fraction ranges from 90.0% to 99.5%; (3) the melting point ranges from 153° C. to 167° C.; and (4) in an elution temperature-elution volume curve measured by temperature-rising elution fractionation (TREF), the maximum peak has a peak top temperature in the range of 116° C. to 125° C. and a half-width of 7.0° C. or less.
摘要:
Metallocene compounds of the invention are useful as olefin polymerization catalysts or catalyst components. Olefin polymerization processes of the invention involve an olefin polymerization catalyst containing the metallocene compound. In detail, the olefin polymerization catalysts can catalyze with high polymerization activity the production of olefin polymers having high melt tension, excellent mechanical strength and good particle properties, and the olefin polymerization processes involve the catalysts. Ethylene polymers according to the invention are obtained by the polymerization processes and have higher processability and easy-opening properties and particularly excellent mechanical strength compared to conventional ethylene polymers. Thermoplastic resin compositions of the invention contain the ethylene polymers. In more detail, shaped articles or films are obtained from the ethylene polymers or the thermoplastic resin compositions containing the ethylene polymers, and laminate films include the films.According to the invention, a single or plural kinds of bridged metallocene compounds having differing cyclopentadienyl-derived groups afford macromonomers that are a source of long-chain branches and simultaneously catalyze the repolymerization of the macromonomers into olefin polymers having a large number of long-chain branches, small neck-in in the T-die extrusion, small take-up surge and superior mechanical strength. The olefin polymerization catalysts and the polymerization processes can efficiently produce the olefin polymers.
摘要:
An injection-molding die including: a fixed die; a movable die; a cavity defined by the fixed die and the movable die; and a gate for injecting a melt resin into the cavity. The cavity includes: a flow-dividing structure that divides a flow of the melt resin injected into the cavity into a plurality of resin flows; and a flow-advancing area in which the resin flows generated by the flow-dividing structure are merged together. The flow-advancing area is formed thicker than a flow-hesitating area of the flow-advancing area in the cavity.
摘要:
After introducing gas into a cavity of a clamped die to boost a pressure therein, a resin material containing a foaming agent is injected. After forming a skin layer, at the same time as a start of a core-back operation for foaming the resin material or after the core-back operation, gas in the cavity is vacuum-suctioned to make a pressure in the cavity less than the atmospheric pressure. By cooling and solidifying, an injection foam molded article is obtained. Before complete solidification, gas between the resin material and an inner surface of the die is reliably discharged out of the cavity, so that surface recesses and generation of swirl marks due to gas accumulation can be prevented.
摘要:
[Object] To provide a polypropylene resin composition for use in the formation of a microporous membrane having excellent heat resistance and low thermal shrinkage ratio.[Solution] A polypropylene resin composition for use in the formation of a microporous membrane according to the present invention comprises as an essential component a propylene homopolymer (A) that satisfies the following requirements (1) to (4) and (7): (1) the intrinsic viscosity [η] is 1 dl/g or more and less than 7 dl/g; (2) the mesopentad fraction ranges from 94.0% to 99.5%; (3) the integral elution volume during heating to 100° C. is 10% or less; (4) the melting point ranges from 153° C. to 167° C.; and (7) in an elution temperature-elution volume curve, the maximum peak has a peak top temperature in the range of 105° C. to 130° C. and a half-width of 7.0° C. or less.
摘要:
An object of the invention is to provide foaming polypropylene resin compositions that are suited for injection foam molding, have excellent balance between flowability and melt tension, are foamable at high expansion ratio, and can give lightweight molded foams having excellent appearance and mechanical strength. Another object is to provide injection-molded foams using the compositions.A foaming polypropylene resin composition of the invention includes: 50 to 90 parts by weight of a high-molecular weight component-containing impact polypropylene (AB); 10 to 30 parts by weight of a rubber component (C); and 0 to 20 parts by weight of an inorganic filler (D) (wherein the total of (AB), (C) and (D) is 100 parts by weight); and the high-molecular weight component-containing impact polypropylene (AB) contains 4.5 to 31.0 wt % of a propylene/ethylene copolymer that is identified as a normal temperature paraxylene soluble component, and the high-molecular weight component-containing impact polypropylene (AB) contains 0.2 to 3.7 wt % of a propylene polymer component having an intrinsic viscosity [η] at 135° C. in tetralin of 13.5 to 20.0 dl/g.