摘要:
Disclosed is a polymer composition comprising a copolymer of propylene, a specific amount of α-olefin having 4 or more carbon atoms and optionally a specific amount of ethylene and a specific 1-butene homopolymer or copolymer having a melting point of not lower than 60° C. but lower than 125° C., wherein the polymer composition contains a 20° C. xylene-soluble portion of the polymer composition in an amount of from 5 to 45% by weight and the 20° C. xylene-soluble portion has an intrinsic viscosity of 1.3 dl/g or higher. The polymer composition may optionally contain a specific propylene copolymer and/or a specific propylene homopolymer or copolymer having a melting point of from 150° C. to 170° C.
摘要:
Disclosed is a resin composition comprising from 20 to 99 parts by weight of a propylene-based polymer A having an MFRA of from 0.3 to 20 g/10 min and a melting point TmA of from 125 to 140° C. and from 1 to 80 parts by weight of a propylene-based polymer B having an MFRB of from 21 to 200 g/10 min and a melting point TmB of from 135 to 170° C., wherein a ratio TmA/TmB is less than 1, wherein a ratio MFRA/MFRB is 0.01
摘要:
An .alpha.-olefin polymerization catalyst system having so high a catalytic activity and stereoregularity that the catalyst residue and amorphous polymer need not be removed and a process for producing an.alpha.-olefin polymer using the catalyst system, said catalyst system consisting essentially of:(A) a trivalent titanium compound-containing solid catalyst component prepared by reducing a titanium compound, represented by the general formula Ti(OR.sup.1).sub.a X.sub.4-a in which R.sup.1 represents a hydrocarbon group having 1 to 20 carbon atoms; X represents a halogen atom; and a represents a numeral satisfying 0
摘要翻译:具有如此高的催化活性和立构规整性的催化剂残余物和无定形聚合物不需要除去的α-烯烃聚合催化剂体系和使用该催化剂体系生产α-烯烃聚合物的方法,所述催化剂体系基本上由以下组成:(A )通过还原由通式Ti(OR 1)a X 4-a表示的钛化合物制备的含三价钛化合物的固体催化剂组分,其中R 1表示具有1至20个碳原子的烃基; X表示卤原子; 和a表示满足0
摘要:
Disclosed is a polymer composition comprising a copolymer of propylene, a specific amount of α-olefin having 4 or more carbon atoms and optionally a specific amount of ethylene and a specific 1-butene homopolymer or copolymer having a melting point of not lower than 60° C. but lower than 125° C., wherein the polymer composition contains a 20° C. xylene-soluble portion of the polymer composition in an amount of from 5 to 45% by weight and the 20° C. xylene-soluble portion has an intrinsic viscosity of 1.3 dl/g or higher. The polymer composition may optionally contain a specific propylene copolymer and/or a specific propylene homopolymer or copolymer having a melting point of from 150° C. to 170° C.
摘要:
A polypropylene composition including 0.1 to 15% by weight of (A1) a propylene homopolymer and 85 to 99.9% by weight of (B1) a copolymer of propylene and an α-olefin having at least 4 carbon atoms in which component (B1) contains 0.1 to 5% by weight of α-olefin, or a polypropylene composition comprising 0.1 to 15% by weight of (A2) a copolymer of propylene and an α-olefin having at least 4 carbon atoms and 85 to 99.9% by weight of (B2) a copolymer of propylene and an α-olefin having at least 4 carbon atoms in which component (A2) contains 0.1 to 5% by weight of the α-olefin, component (B2) contains 0.2 to 5% by weight of α-olefin, and the content of the α-olefin in component (B2) is larger than the content of the α-olefin in component (A2).
摘要:
A process for a polyolefin-based resin composition, which comprises melt-kneading 100 parts by weight of a polyolefin-based resin and not less than 0.05 parts by weight and less than 2 parts by weight of polymer fine particles containing 0.10 to 90% by weight of a volatile component as an anti-blocking agent.
摘要:
Disclosed is a resin composition that comprises a propylene-based copolymer (X) consisting of two kinds of copolymeric components made up of propylene, &agr;-olefin and optionally ethylene which are characterized by ethylene content and &agr;-olefin content, the copolymer (X) exhibiting a specific endothermic behavior in DSC measurement; a crystalline olefin-based polymer (Z) having a melting point up to 115° C.; and optionally a copolymer (Y) made up of propylene and &agr;-olefin and/or ethylene. The resin composition can be modified by addition of a propylene-based polymer (W) and/or a nucleating agent (N) and can yield a film superior in low-temperature heat sealability and antiblocking property.
摘要:
Disclosed is a resin composition that comprises a propylene-based copolymer (X) consisting of two kinds of copolymeric components made up of propylene, &agr;-olefin and optionally ethylene which are characterized by ethylene content an &agr;-olefin content, the copolymer (X) exhibiting a specific endothermic behavior in DSC measurement and a copolymer (Y) made up of propylene and &agr;-olefin and/or ethylene. The resin composition can afford a film superior in low-temperature heat sealability and antiblocking property.
摘要:
A polypropylene-based resin composition for stretched film, comprising 20 to 98 parts by weight of a propylene-based polymer(A) having an intrinsic viscosity [&eegr;]A of 1.8 to 8 dl/g and a melting temperature TmA of 140 to 165 ° C. and 2 to 80 parts by weight of a propylene-based polymer(B) having an intrinsic viscosity [&eegr;]B of 0.8 to 1.7 dl/g and a melting temperature TmB of 150 to 170° C., wherein the ratio of TmA to TmB is less than 1, the ratio of the intrinsic viscosity [&eegr;]A to the intrinsic viscosity [&eegr;]B is more than 1 and less than 10, and the melt flow rate of the polypropylene-based resin composition is from 0.1 to 20 g/10 min.
摘要:
The present invention relates to a process for producing ethylene propylene block copolymers excellent in appearance, elongation and impact resistance when molded by a gas phase polymerization which can be conducted in a stable manner.The process of the present invention comprises the first step of polymerizing propylene by using a catalyst system composed essentially of(A) a solid catalyst component containing magnesium, titanium, and a halogen as the indispensable ingredients,(B) an organoaluminum compound, and(C) a silicon compound represented by the formula R.sup.1 R.sup.2 Si(OR.sup.3).sub.2, wherein R.sup.1 is an alicyclic hydrocarbon group and R.sup.2 and R.sup.3 are each a hydrocarbon group, to form a propylene homopolymer, and the second step of then polymerizing ethylene and propylene with further addition of a silicon compound represented by the formula R.sup.4 R.sup.5.sub.a Si(OR.sup.6).sub.3-a, wherein R.sup.4 is an aromatic hydrocarbon group, R.sup.5 is a hydrocarbon group or an aromatic hydrocarbon group, and a is a number satisfying the equation 0.ltoreq.a
摘要翻译:本发明涉及一种生产乙烯丙烯嵌段共聚物的方法,该共聚物通过可以以稳定的方式进行的气相聚合成型而具有优异的外观,伸长率和耐冲击性。 本发明的方法包括通过使用主要由(A)含有镁,钛和卤素的固体催化剂组分作为不可或缺的成分组成的催化剂体系聚合丙烯的第一步骤,(B)有机铝化合物和( C)由式R 1 R 2 Si(OR 3)2表示的硅化合物,其中R 1是脂环族烃基,R 2和R 3各自是烃基,以形成丙烯均聚物,然后第二步再进一步聚合乙烯和丙烯 添加由式R 4 R 5 a Si(OR 6)3-a表示的硅化合物,其中R 4是芳族烃基,R 5是烃基或芳族烃基,a是满足式0的数< 3,形成乙烯 - 丙烯共聚物。