摘要:
A method for producing olefin polymers by using a catalyst system comprising catalyst component (A): a vanadium compound represented by the formula VOX₃ in which X represents a halogen atom, or VO(OR)₃ in which R represents a C₁-C₂₀ hydrocarbon group, catalyst component (B): an aluminoxane obtained by the reaction of a trialkylaluminum with water, or a mixture of said aluminoxane and an aluminum compound represented by the formula AlR′ n X′ 3-n in which R′ represents a C₁-C₁₀ alkyl group, X′ represents a hlaogen atom and n represents a number selected from 0, 1, 2 and 3, and optionally catalyst component (C): an organic compound having at least two hydroxyl groups.
摘要:
A thermoplastic resin composition which comprises: (A) 5 - 95% by weight of a polyamide resin which has a relative viscosity of 3.1 - 4.5 and a ratio (α) of terminal amino groups to terminal carboxyl groups such that 0:1 (B) 95 - 5% by weight of a modified polyphenylene ether resin, which is a polyphenylene ether resin whioh has been modified with at least one compound having at least one functional group, or a mixture of said modified polyphenylene ether resin and a polyphenylene ether resin.
摘要:
A crystalline polypropylene has a ratio of weight average molecular weight to number average molecular weight of 10 or more, preferably 15 or more, an intrinsic viscosity (η) of from 0.8 to 5.0 dl/g (measured in tetralin at 135°C), a cold xylene-soluble content of not more than 4% by weight, a density (d) of 0.910 g/cm or more (measured at 23°C), and a long period (L) (Å) (measured at 25°C by a small-angle X-ray scattering method) satisfying: L ≦ Lc = 6667d - 5894 wherein d is the density at 23°C and Lc is a value (Å) obtained by Lc =6667d - 5894. The crystalline polymer can be compounded with 1 ppm to 20 wt% of an alpha-olefin or vinylcyloalkane whose homopolymer melts at at least 270°C, the composition produced having (d) and (L) as above; part of the composition can be block copolymerized. Catalysts for producing the polymer are described. The product as a powder is melted and moulded to shape. The mouldings have good rigidity, heat resistance and surface hardness.
摘要:
A crystalline polypropylene has a ratio of weight average molecular weight to number average molecular weight of 10 or more, preferably 15 or more, an intrinsic viscosity (η) of from 0.8 to 5.0 dl/g (measured in tetralin at 135°C), a cold xylene-soluble content of not more than 4% by weight, a density (d) of 0.910 g/cm or more (measured at 23°C), and a long period (L) (Å) (measured at 25°C by a small-angle X-ray scattering method) satisfying: L ≦ Lc = 6667d - 5894 wherein d is the density at 23°C and Lc is a value (Å) obtained by Lc =6667d - 5894. The crystalline polymer can be compounded with 1 ppm to 20 wt% of an alpha-olefin or vinylcyloalkane whose homopolymer melts at at least 270°C, the composition produced having (d) and (L) as above; part of the composition can be block copolymerized. Catalysts for producing the polymer are described. The product as a powder is melted and moulded to shape. The mouldings have good rigidity, heat resistance and surface hardness.
摘要:
A stretched polypropylene film having excellent see-through characteristics, which is prepared by stretching in at leastone direction a polypropylene resin sheet containing 0.05 ppm to 1 % by weight of a polymer of a 3-position branched a-olelfin having at least 6 carbon atoms or a polymer of a vinyl cycloalkane. The olefin or cycloalkane (A) can simbly be mixed with a homo- or co-polymer of propylene; or the mixture of (A) and catalyst used in its production can be used for catalytically polymerizing propylene alone or with another a-olefin, and then more polypropylene can be admixed. Other additives, e.g. a filler, can be included. The polymer is pelletized and formed into a sheet and usually biaxially stretched; the streching areal ratio can be 1.2 to 100 times.
摘要:
A method for producing olefin polymers by using a catalyst system comprising catalyst component (A): a vanadium compound represented by the formula VOX₃ in which X represents a halogen atom, or VO(OR)₃ in which R represents a C₁-C₂₀ hydrocarbon group, catalyst component (B): an aluminoxane obtained by the reaction of a trialkylaluminum with water, or a mixture of said aluminoxane and an aluminum compound represented by the formula AlR′ n X′ 3-n in which R′ represents a C₁-C₁₀ alkyl group, X′ represents a hlaogen atom and n represents a number selected from 0, 1, 2 and 3, and optionally catalyst component (C): an organic compound having at least two hydroxyl groups.
摘要:
Crystalline polypropylene homopolymer or a copolymer with up to 5 mol% of other α-olefin or optionally containing a grafted vinyl compound, preferably of intrinsic viscosity 1.1 to 3.5 dl/g, has incorporated, during polymerization or by blending, 0.05 to 10,000 ppm of a polymer of a vinylcycloalkane, which may be a copolymer with up to 20 mol% of an α-olefin or styrene, preferably obtained with a Ziegler-Natta catalyst. The resultant polypropylene can be spun and stretched.