摘要:
The invention provides a polypropylene based resin composition, which has good moldability on injection molding and which is excellent in its flow mark appearance as well as weld appearance on molding, and suitable for injection-molded articles such as exterior parts of automobiles, and also provides a moldability modifier used for the composition.The invention is a moldability modifier for a polypropylene based resin, which comprises at least one of a propylene homopolymer and a propylene random polymer having die swell ratio of 1.5 to 2.5 and ratio (Q value: Mw/Mn) of 7 to 13 of the weight average molecular weight (Mw) to the number average molecular weight (Mn) measured by gel permeation chromatography (GPC). The moldability modifier is mixed with a propylene-ethylene block copolymer, an ethylenic or styrenic elastomer, an inorganic filler, etc. to prepare a polypropylene based resin composition.
摘要:
The present invention provides a resin composition high in melting flow, exhibiting good properties, excellent in moldability and shrinkage properties, and hence suitable for automobile exteriors, by including (A) propylene/ethylene block copolymer having a melt flow rate (MFR) of 100 to 200 g/10 min., its propylene homopolymer component having an MFR of 210 to 400 g/10 min. and isotactic pentad fraction of 0.98 or more, and its copolymer portion containing propylene at 65 to 85% by weight; 50 to 70% by weight, (B) ethylene/octene and/or ethylene/butene random copolymer; 10 to 25% by weight, (C) styrene-based hydrogenated block copolymer rubber; 4 to 9% by weight and (D) talc; 16 to 24% by weight.
摘要:
The present invention provides A polypropylene-based resin composition, comprising (A) 45 to 85 wt. % of a propylene/ethylene block copolymer, having a melt flow rate (MFR) of 100 g/10 min. or more for the propylene homopolymer portion and 50 to 200 g/10 min. for the total copolymer, (B) 0.5 to 20 wt. % of a propylene homopolymer having a weight-average molecular weight (Mw) of 10,000 to 110,000, (C) 5 to 35 wt. % of an ethylene/&agr;-olefin copolymer rubber and/or ethylene/&agr;-olefin/non-conjugate diene copolymer rubber, and/or hydrogenated block copolymer rubber, having an MFR of 0.1 to 20 g/10 min., and (D) 5 to 30 wt. % of talc having an average particle size of 10 &mgr;m or less, determined by the laser diffraction method.
摘要:
There is provided a thermoplastic resin composition comprising the following components (A) to (E): component (A): 50 to 74.7% by weight of a Ziegler-Natta catalyst sequentially polymerized blend of a propylene homopolymer and an ethylene-propylene copolymer, component (B): 5 to 10% by weight of an ethylene-octene random copolymer, component (C): 5 to 10% by weight of an ethylene-butene random copolymer, component (D): 0.3 to 5% by weight of an elastomer.
摘要:
The invention is to provide a talc-containing polypropylene resin composition by an in-line compounding, capable of solving a drawback where a reduced compression level for avoiding white spots caused by insufficient dispersion of inorganic filler increases the amount of involved air, thus detrimentally affecting the productivity particularly in case of a large-scale kneader, and a producing method therefor; namely a polypropylene resin composition including (A) a degassed-compressed talc which has a bulk specific gravity of from 0.3 to 1.0 and a compression rate of from 3.1 to 7.0, which is obtained by degassing and compressing talc having an average particle size of from 0.1 to 12 μm and a bulk specific gravity of from 0.1 to 0.5, and which contains a component of 1,000 μm or larger, when sieved by a ro-tap method, in a content of 15 wt % or less, and (B) a polypropylene resin, and a producing method therefor.
摘要:
A polypropylene type aqueous dispersion comprising the following components (a) to (c): (a) a polypropylene type polymer100parts by weight and/or a modified polypropylene type polymer (b) a surfactant1 to 100parts by weight, and (c) water100 to 1,000parts by weight, wherein the component (a) has a main chain having the following features (1) and (2) and dispersion particles in the dispersion have an average particle size of at most 0.5 μm, Feature (1) when observing a peak derived from a carbon atom of a methyl group in a propylene unit chain part comprising a head-to-tail bond by 13C-NMR and fixing a chemical shift of a peak top at a peak attributable to pentad expressed by mmmm to 21.8 ppm, a ratio (S1/S) of an area S1 of a peak of a peak top at 21.8 ppm to a total area S of peaks at from 19.8 ppm to 22.1 ppm is at least 10% and at most 60%, and when an area of a peak (mmmr) of a peak top at 21.5 to 21.6 ppm is expressed as S2, 4+2S1/S2>5, and Feature (2) a content ratio (mol ratio) of propylene unit (A): other olefin unit (B) is from 100:0 to 90:10.
摘要:
A moldability modifier capable of improving molding processability, and a polypropylene resin composition using the same suitable for automobile exterior parts are provided. The invention relates to a moldability modifier comprising propylene block copolymer (A) containing from 80 to 98 wt % of a propylene homopolymer portion (A1) and from 2 to 20 wt % of a propylene/ethylene random copolymer portion (A2), wherein the MFR of (A1) is 300 g/10 min or more, the ethylene content of (A2) is from 10 to 70 wt %, the [η] of (A2) is 6.5 dl/g or more, and the MFR as a whole is 40 g/10 min or more; and propylene block copolymer (B) containing from 20 to 79 wt % of a propylene polymer portion (B1) and from 21 to 80 wt % of a propylene/ethylene random copolymer portion (B2), wherein the MFR of (B1) is 20 g/10 min or more, the ethylene content of (B2) is from 20 to 70 wt %, the [η] of (B2) is from 2.5 to 9.0 dl/g, and the MFR as a whole is from 0.1 to 50 g/10 min; and a polypropylene resin composition using the same.
摘要:
A polypropylene-based resin composition of drastically improved dimensional stability realized by incorporating a polypropylene resin of specific structure with an inorganic filler of specific particle size, carbon fibers of specific fiber diameter and length, and, as required, an ethylene- and/or styrene-based elastomer. Another polypropylene-based resin composition of well-balanced properties of rigidity, heat-resistance, impact resistance and lightness even essentially in the absence of inorganic filler, realized by compositing a propylene/ethylene block copolymer of specific structure and well-balanced mechanical properties with an ethylene- and/or styrene-based elastomer, and carbon fibers of specific structure.
摘要:
An optical material with a high refractive index comprising a resin which is obtainable by polymerization and curing of a composition comprising the following components (A), (B) and (C):component (A): a sulfur-containing (meth)acrylic monomer represented by the following formula [I], or a mixture of the monomer [I] and a sulfur-containing (meth)acrylic monomer represented by the following formula [II]: ##STR1## in each of which formulas, R.sup.1 represents a hydrogen atom or a methyl group, R.sup.2 and R.sup.3 independently represent a hydrocarbyl group of 1 to 12 carbon atoms, X represents a halogen atom except fluorine, and n represents 0 or an integer of 1 to 4, provided that those groups which are in plurality may be the same or different,the weight ratio of the compound [I]/the compound [II] being from 10/0 to 1/9;component (B): a hydroxy(meth)acrylic monomer represented by the following formula [III]: ##STR2## wherein R.sup.5 represents a hydrogen atom or a methyl group, R.sup.4 represents a hydrocarbyl group of 1 to 20 carbon atoms which may or may not contain an ether oxygen atom, Y represents a halogen atom except fluorine, and m represents 0 or an integer of 1 or 2, provided that those groups which are in plurality may be the same or different, and p is 1 or 2,the weight ratio of the component (A)/the component (B) being from 95/5 to 50/50; andcomponent (C): an isocyanate compound having a plurality of --NCO groups,the ratio (--NCO/--OH) of the number of --NCO group in the component (C) to the total number of --OH group in the components (A) and (B) being from 0.2 to 3.The above material for lenses has a low specific gravity and improved refractive index, transparency and impact resistance.
摘要:
A polypropylene resin composition contains 2 to 15 wt % of a moldability improver (A) and 85 to 98 wt % of a polypropylene resin (B). The moldability improver (A) is formed of propylene block copolymers (A-1) and (A-2). Each of the propylene block copolymers (A-1) and (A-2) has a crystalline propylene polymer component (A-11), (A-21) and a propylene-ethylene random copolymer component (A-12), (A-22). The propylene block copolymer (A-1) is characterized in that the melt flow rate of the crystalline propylene polymer component (A-11) is high, whereas the propylene block copolymer (A-2) is characterized in that the content ratio of the propylene-ethylene random copolymer component (A-22) is high. The polypropylene resin (B) is formed of a propylene-ethylene block copolymer (B-1), at least one of an ethylene elastomer and a styrene elastomer (B-2) and an inorganic filler (B-3).