Abstract:
Process for the production of propylene polymers having a Melt Flow rate (230°C, 2.16 Kg) higher than 30 g/10' and preferably higher than 50 g/10' and also characterized by having broad molecular weight distribution (MWD) carried out in the presence of a catalyst system comprising (a) a solid catalyst component containing Mg, Ti, halogen and an electron donor compound selected from succinates; (b) an alkylaluminum cocatalyst; and (c) a silicon compound of formula R1Si(OR)3 in which R1 is a branched alkyl and R is, independently, a C1-C10 alkyl.
Abstract:
A masterbatch composition, a polyolefin composition prepared from the masterbatch composition and articles prepared from the polyolefin composition. The masterbatch composition contains (percent by weight) from 20 % to 90 % of A) a crystalline polypropylene component containing from 25 % to 75 % of a fraction AI having a melt flow rate MFRI of from 0.5 to 10 g/10 min., and from 75 % to 25 % of a fraction AII having a melt flow rate MFRII such that a ratio MFRII/MFRI is from 30 to 2000; and where fractions A?I and AII¿ are independently selected from the group consisting of a propylene homopolymer, a random copolymer of propylene containing up to 8 % of ethylene, and a random copolymer of propylene containing up to 8 % of at least one C¿4?-C10 α-olefin; and from 10 % to 80 % of B) a copolymer component of ethylene and at least one C3-C10 α-olefin, the copolymer containing from 10 to 70 % of ethylene, and optionally minor amounts of a diene, the copolymer being soluble in xylene at room temperature, and having an intrinsic viscosity [θ] of from 4 to 9 dl/g. Articles prepared by injection molding the polyolefin composition exhibit a good balance of physical properties and reduced surface defects such as tiger striping.
Abstract:
A method for secondary-molding a polymer nano oriented crystal material in accordance with the present invention includes the steps of: (1) heating the polymer nano oriented crystal material so that the polymer nano oriented crystal material changes into (a) a mobile phase or (a) a melt having a dense entanglement network structure; (2) molding the polymer nano oriented crystal material which changed into (a) the mobile phase or (b) the melt including the dense entanglement network in the step (1); and (3) cooling the polymer nano oriented crystal material, which has undergone the step (2), until the polymer nano oriented crystal material changes into an ordered phase.
Abstract:
A polypropylene multilayer sheet comprising: a biaxially oriented polypropylene layer F having a melting point TmF; and a biaxially oriented polypropylene layer N having a melting point TmN, the biaxially oriented polypropylene layer N and the biaxially oriented polypropylene layer F being alternately laminated, the polypropylene multilayer sheet having a thickness of 0.30 to 3.0 mm, wherein TmF > TmN , a total number of layers is 3 to 11, the biaxially oriented polypropylene layer F is formed of a resin composition containing: a polypropylene-based resin as a component (A); and an inorganic filler as a component (B), a weight ratio of the component (B)/[the component (A) + the component (B)] is 0.5 to 60 wt%, the biaxially oriented polypropylene layer N is formed of a resin composition containing: a polypropylene-based resin as a component (a); and a component (B) as an optional component, and a weight ratio of the component (B)/[the component (a) + the component (B)] is 0 to 10 wt%.
Abstract:
The present invention is a process and apparatus for manufacturing a crystalline resin film or sheet. This manufacturing apparatus includes: an extruder (10) that melts crystalline resin while supplying it; a gear pump (20) that is provided on the downstream side of the extruder (10); a die (30) which is provided on the downstream side of the gear pump (20), and which has a slit-shaped aperture; a cooling apparatus (40) which cools film-shaped or sheet-shaped crystalline resin (A) discharged in a melted state from the die (30) to a temperature which is not less than the crystallization temperature but not more than the melting point; and a pair of pinch rolls (50a, 50b) that press-roll between them the film-shaped or sheet-shaped crystalline resin (B) which has passed through the cooling apparatus (40), wherein the pair of guide rolls (50a, 50b) are positioned such that the thickness of the film-shaped or sheet-shaped crystalline resin (B) which has passed through the cooling apparatus (40) is between 1.3 and 8.0 times the thickness of the film or sheet (C, D) after it has been press-rolled.
Abstract:
A polymer molded article including: a base portion; and a surface layer portion thermally bonded onto the base portion, wherein the polymer molded article satisfies the following requirements: 1) Gs > Gb where Gs is a rigidity of the surface layer portion, and Gb is a rigidity of the base portion; and 2) Tms
Abstract:
A polypropylene multilayer sheet comprising: a first biaxially oriented polypropylene layer having a melting point Tmh; and a second biaxially oriented polypropylene layer having a melting point Tml, the first biaxially oriented polypropylene layer and the second biaxially oriented polypropylene layer being alternately laminated, the polypropylene multilayer sheet having a thickness of 0.20 to 3.0 mm, wherein Tmh > Tml , and a total number of layers is 3 to 11.