摘要:
A propylene-ethylene-butene block copolymer is provided which includes from 60 to 85% by weight of a polypropylene portion and from 15 to 40% by weight of a propylene-ethylene-butene random copolymer portion, wherein the copolymer satisfies the requirements (1) and (2) given below. In addition, a molded article including such a propylene-ethylene-butene block copolymer is provided. (1) The random copolymer portion includes a propylene-ethylene random copolymer component (EP) and a propylene-ethylene-butene random copolymer component (EPB) and the copolymer component (EP) has an intrinsic viscosity of from 1.5 to 8 dl/g and an ethylene unit content of from 20 to 50% by weight, and the copolymer component (EPB) has an intrinsic viscosity of from 0.5 to 8 dl/g, an ethylene unit content of from 47 to 77% by weight and a butene unit component of from 3 to 33% by weight and the total of the ethylene unit content and the butene unit content is from 50 to 80% by weight. (2): The propylene-ethylene-butene block copolymer has a melt flow rate of from 5 to 120 g/10 min.
摘要:
A propylene-ethylene-butene block copolymer is provided which includes from 60 to 85% by weight of a polypropylene portion and from 15 to 40% by weight of a propylene-ethylene-butene random copolymer portion, wherein the copolymer satisfies the requirements (1) and (2) given below. In addition, a molded article including such a propylene-ethylene-butene block copolymer is provided.(1) The random copolymer portion includes a propylene-ethylene random copolymer component (EP) and a propylene-ethylene-butene random copolymer component (EPB) and the copolymer component (EP) has an intrinsic viscosity of from 1.5 to 8 dl/g and an ethylene unit content of from 20 to 50% by weight, and the copolymer component (EPB) has an intrinsic viscosity of from 0.5 to 8 dl/g, an ethylene unit content of from 47 to 77% by weight and a butene unit component of from 3 to 33% by weight and the total of the ethylene unit content and the butene unit content is from 50 to 80% by weight.(2): The propylene-ethylene-butene block copolymer has a melt flow rate of from 5 to 120 g/10 min.
摘要:
A method for feeding a boron compound, which comprises feeding at least one boron compound selected from (1) to (3) described below in the state suspended or slurried in a solvent continuously to a reactor; a boron compound in the form of fine particles being one or more boron compounds selected from (1) to (3) described below and having a maximum particle diameter of 50 &mgr;m or less; a catalyst component for olefin polymerization consisting of said boron compound in the form of fine particles; a method for producing a boron compound in the form of fine particles which comprises dissolving one or more boron compounds selected from (1) to (3) described below in an aromatic hydrocarbon solvent and then precipitating in an aliphatic hydrocarbon solvent; and a method for producing a boron compound in the form of fine particles which comprises pulverizing one or more boron compounds selected from (1) to (3) described below so that their maximum particle diameter is 50 &mgr;m or less. (1) a boron compound represented by the general formula: BQ1Q2Q3, (2) a boron compound represented by the general formula: G+(BQ1Q2Q3Q4)−, and (3) a boron compound represented by the general formula: (L-H)+(BQ1Q2Q3Q4)−.
摘要:
For use in gas phase polymerization apparatus having an agitator in a fluidized bed polymerization reactor, the present invention provides a gas distributor which has holes, and caps covering the respective holes from above and each having an opening oriented in a substantially horizontal direction at an angle of about 90 to about 135 deg with, and outwardly of, a tangent to a circle centered about the center of the reactor whereby an increase in the gas solid ratio can be prevented in the region above the distributor to ensure efficient discharge of the polymer produced, and the polymer particles can be prevented from falling into a gas room thereunder.
摘要:
Disclosed are thermoplastic resin compositions, comprising:(a) a polyphenylene ether resin or a resin composition containing a poplyphenylene ether,(b) a modified propylene polymer, or a propylene based resin composition containing the modified propylene polymer and/or a propylene polymer, and(c) optionally, a rubbery substance,wherein the proportion of the component (a) to the sum of the components (a) and (b) is 1 to 90% by weight, and that of the component (b) to the sum of the components (a) and (b) is 99 to 10% by weight, and when the component (c) is present, the proportion of the component (c) to the sum of the components (a) and (b) is 1 to 50 parts by weight per 100 parts by weight of (a) plus (b).
摘要:
There is disclosed resin composition comprising 1 to 99% by weight of a polymer A and 1 to 99% by weight of a polymer B, the polymer A and B having refractive indexes which permit satisfaction of the relation:a.ltoreq.0.015 and b-a.gtoreq.0.005wherein a and b are the minimum and the maximum, respectively, of absolute value of the difference between the refractive indexes of the polymers A and B in the temperature range of 20.degree. to 100.degree. C.; said composition being useful as a functional resin for buildings, etc.
摘要:
A process for producing a 4-methylpentene-1 copolymer comprising copolymerizing 4-methylpentene-1 with other .alpha.-olefin in a hydrocarbon solvent in the presence of a Ziegler-Natta catalyst and a resin composition containing the 4-methylpentene-1 copolymer are disclosed. The copolymerization comprises a first stage in which (A) a homopolymer or random copolymer of 4-methylpentene-1 having an .alpha.-olefin content of not more than 3 mol % and an intrinsic viscosity of at least 2.5 dl/g is prepared and a second stage in which (B) a random copolymer having an .alpha.-olefin content higher than that of the polymer (A) and no higher than 9 mol % and an intrinsic viscosity of at least 2.5 dl/g is prepared, and the produced copolymer insoluble in the solvent is separated to recover a 4-methylpentene-1 copolymer containing from 5 to 80% by weight of the polymer (A). The process produces a solvent-insoluble copolymer in an increased yield without impairing transparency of the copolymer.
摘要:
A process for producing propylene-ethylene block copolymers by a three-step polymerization technique using a stereoregular catalyst, characterized in that the first-step polymerization is carried out by supplying propylene alone or a propylene/ethylene mixture so that the ethylene/propylene reaction ratio is 6/94 or less, thereby polymerizing 60 to 95% by weight of the total polymerization amount, the second-step polymerization is carried out by supplying a propylene/ethylene mixture so that the ethylene/propylene reaction ratio is 15/85 to 79/21, thereby polymerizing 1 to 20% by weight of the total polymerization amount, and the third-step polymerization is carried out by supplying a propylene/ethylene mixture so that the ethylene/propylene reaction ratio is 50/50 to 89/11, thereby polymerizing 4 to 35% by weight of the total polymerization amount, with the ethylene/propylene reaction ratio in the third step made larger than that in the second step. Said process can give propylene-ethylene block copolymers markedly well balanced in impact strength, stiffness, transparency and impact blushing.
摘要:
Disclosed is a propylene-based polymer including from 51 to 75% by weight of a propylene-ethylene random copolymer component (A) having an intrinsic viscosity [η]A, measured in tetralin at 135° C., of 5 dl/g or more and an ethylene content of not less than 8% by weight but less than 20% by weight, and from 25 to 49% by weight of a propylene-based polymer component (B) obtained by polymerizing monomers mainly including propylene, the component having an intrinsic viscosity [η]B, measured in tetralin at 135° C., of 1.2 dl/g or less, wherein said amounts of the components (A) and (B) are each based on the combined weight of these components.
摘要:
A propylene-based copolymer obtained by copolymerizing propylene with ethylene and/or an &agr;-olefins having 4 or more carbon atoms in the presence of a polymerization catalyst in a first step to produce a copolymer having a content of the &agr;-olefins of 1 mol % or more and less than 15 mol % and an ethylene content of 5 mol % or less in amount of 1 to 30% by weight as a copolymer component (A), and subsequently copolymerizing propylene with ethylene and/or an &agr;-olefins having 4 or more carbon atoms in a second step or later steps to produce a copolymer having a content of the &agr;-olefins of 15 to 30 mol % and an ethylene content of 5 mol % or less in amount of 70 to 99% by weight as a copolymer component (B).