100 results about "Zero shear viscosity" patented technology

An optical cable, which is flame-retardant, and has excellent adhesion of the protective covering to the fiber cladding and uniform thickness of the fiber cladding, contains a polymer optical conductor containing a fiber core; a single-layer or multi-layer fiber cladding; an inner external layer which adheres to the fiber cladding with a peel force of at least 50 N; and an outer external layer which adheres to the inner external layer with a peel force of not more than 30 N. The inner external layer contains a molding composition having a first polyamide selected from a) PA 11, b) PA 12, c) PA 1012, d) PA 1212, e) a copolyamide of at least two of PA 11, PA 12, PA 1012 and PA 1212, said copolyamide containing not more than 30 mol % of a comonomer, and f) mixtures thereof. The first polyamide contains at least 50 mueq / g of amino end groups. The first molding composition has a zero-shear viscosity of from 400 to 6000 Pas. The outer external layer contains a second molding composition which has the following i)-iii): i) from 20 to 95% by weight of a second polyamide selected from a) PA 11, b) PA 12, c) PA 1012, d) PA 1212, e) a copolyamide of at least two of PA 11, PA 12, PA 1012 and PA 1212, said copolyamide containing not more than 30 mol % of a comonomer, f) a polyetheramide of at least one of a)-e), and g) mixtures thereof, ii) from 5 to 45% by weight of a flame retardant, and iii) from 0 to 60% by weight of an impact modifier.

The instant invention provides a polyolefin composition suitable for injection molding applications, and method of making such injection molded articles. The polyolefin composition suitable for injection molding applications comprises: an ethylene / α-olefin interpolymer composition comprising: (a) from 25 to 50 percent by weight of a first ethylene / α-olefin copolymer fraction having a density in the range of from 0.924 to 0.937 g / cm3, a melt index (I2) in the range of from 0.03 to 0.3 g / 10 min, (b) from 50 to 75 percent by weight of a second ethylene homopolymer fraction having a density in the range of from greater than 0.960 g / cm3, a melt index (I2) in the range of from 100 to 180 g / 10 minutes, wherein said ethylene / α-olefin interpolymer composition has a density in the range of from 0.950 to 0.958 g / cm3, a melt index (I2) in the range of from 1.0 g / 10 min to 3.5 g / 10 min, a zero shear viscosity ratio (ZSVR) in the range of from 1.01 to 2.5, a molecular weight distribution (Mw / Mn) in the range of from 2.0 to 4.0, and tan delta at 0.1 radian / second and 190° C. in the range of from 9 to 50.

A highly functional polyethylene fiber which combines high heat-insulating properties with cut resistance and is excellent in productivity and suitability for passing through post-processing; and a coated elastic yarn including the fiber, a woven / knitted fabric, and a glove. The polyethylene fiber comprises polyethylene which is constituted of repeating units of substantially ethylene and which, in the fiber state, has a weight-average molecular weight (Mw) of 50,000-300,000 and a ratio of the weight-average molecular weight to the number-average molecular weight (Mn), Mw / Mn, of 4.0 or lower. The polyethylene fiber has a gel content of 100-10,000 ppm or a zero-shear viscosity in a molten state at 190 C of 8,000-300,000 (Pas).

Ethylene alpha-olefin copolymers formed by contacting at least one supported metallocene catalyst, ethylene, and an alpha-olefin in a gas phase reactor are disclosed. In some embodiments, the polymer may have: a density of between 0.890 and 0.970 g / cc; a melt index of between 0.7 and 200 dg / min; a melt index ratio of less than 30; an ESCR value of greater than 1000 hours; and a 1% secant modulus of greater than 75,000 psi. In other embodiments, the polymer may have: a density of between 0.930 g / cc and 0.970 g / cc; a melt index of between 10 dg / min and 200 dg / min; a melt index ratio of between 10 and 25; a part weight of greater than 3 g and a part length of greater than 38 cm in a spiral flow test, and; a zero shear viscosity of less than 150 Pa·s. Processes to produce these polymers are also disclosed.

A multi-layered shrink film comprising: at least three layers including two skin layers and at least one core layer; wherein at least one layer comprises from 10 to 100 weight percent units derived from one or more ethylene-based polymer compositions characterized by having Comonomer Distribution Constant in the range of from 75 to 220, a vinyl unsaturation of from 30 to 100 vinyls per one million carbon atoms present in the backbone of the ethylene-based polymer composition; a zero shear viscosity ratio (ZSVR) in the range from at least 2.5 to 15; a density in the range of 0.924 to 0.940 g / cm3, a melt index (I2) in the range of from 0.1 to 1 g / 10 minutes, a molecular weight distribution (Mw / Mn) in the range of from 2.5 to 10, and a molecular weight distribution (Mz / Mw) in the range of from 1.5 to 4; and wherein the multi-layered film exhibits at least one characteristic selected from the group consisting of 45 degree gloss of at least 50%, a total haze of 15% or less, an internal haze of 8% or less, 1% CD Secant Modulus of 43,000 psi or greater, 1% MD Secant Modulus of 38,000 psi or greater, CD shrink tension of at least 0.7 psi, and / or MD shrink tension of at least 10 psi.

Disclosed herein are ethylene-based polymers generally characterized by a density of at least 0.94 g / cm3, a high load melt index from 4 to 20 g / 10 min, a zero-shear viscosity at 190° C. from 20,000 to 400,000 kPa-sec, and a relaxation time at 190° C. from 225 to 3000 sec. These ethylene polymers can be produced by peroxide-treating a broad molecular weight distribution Ziegler-catalyzed resin, and can be used in large diameter, thick wall pipes and other end-use applications.

The present invention provides a film including, in at least a part thereof, a layer comprising an ethylene-based resin, which is a copolymer of ethylene and an α-olefin of 4 to 10 carbon atoms, and satisfies the following requirements (1) to (5) at the same time or an ethylene-based resin composition containing the resin;(I) the melt flow rate at 190° C. under a load of 2.16 kg is in the range of 0.1 to 50 g / 10 min,(II) the density is in the range of 875 to 970 kg / m3,(III) the ratio of a melt tension at 190° C. to a shear viscosity at 200° C. and an angular velocity of 1.0 rad / sec is in the range of 1.00×10−4 to 9.00×10−4,(IV) the sum of the number of methyl branches and the number of ethyl branches, each number being based on 1000 carbon atoms and measured by 13C-NMR, is not more than 1.8, and(V) the zero shear viscosity [η0(P)] at 200° C. and the weight-average molecular weight (Mw) as measured by a GPC-viscosity detector method (GPC-VISCO) satisfy the following relational formula (Eq-1):0.01×10−13×Mw3.4≦η0≦4.5×10−13×Mw3.4  (Eq-1).

Provided is an ethylene copolymer with improved elasticity and processibility. More specifically, provided is an ethylene copolymer which exhibits a high zero shear viscosity and a large degree of shear thinning degree, and shows rheological characteristics behaviors differentiated from products manufactured by using the existing metallocene and Ziegler-Natta catalysts. In addition, provided is an ethylene copolymer which has a low processing load, shows differentiated behavior in Van-Gurp Palmen analysis, and exhibits excellent Neck-in characteristics.