12 results about "Extensional viscosity" patented technology

High-density polyethylene according to the present invention can improve both processability and excellent moisture barrier properties, without degradation of physical properties during film processing and without blending with low-density polyethylene or the like, through fine control of a melt flow index, a polydispersity index (PDI), and elongation viscosity, in addition to having a high density.

The present invention provides an ionomer having high strain-hardening properties and excellent moldability.　The ionomer contains: a structural unit (A) derived from at least one member selected from the group consisting of ethylene and an α-olefin having 3 to 20 carbon atoms; a structural unit (B) having at least one member selected from the group consisting of a carboxyl group and a dicarboxylic acid anhydride group; and a structural unit (C) having a carboxylic acid metal salt group. The ionomer has 50 or fewer methyl branches per 1,000 carbon atoms or has a total number of ethyl and butyl branches of less than 4.2 per 1,000 carbon atoms. When the maximum elongation viscosity after strain hardening is defined as ηmax(t1), a time t in question is defined as t1, and an approximate straight line of the elongation viscosity before stain hardening is defined as ηlin(t), ηmax(t1) and ηlin(t1) satisfy ηmax(t1)> ηlin(t1), and further satisfy formula (α) or (β).　Formula (α): ηmax(t1)>1.9 ηlin(t1)1.1 Formula (β): ηmax(t1)≥1.9 ηlin(t1)0.7

We propose a sheet that can ensure tensile strength, elongation at break, flexural modulus, and fatigue resistance, while also suppressing uneven crystallization during sheet formation, resulting in a smooth sheet, i.e., a sheet with reduced surface irregularities. [Solution] A resin sheet comprising a copolymer (A) containing butene-1 and at least one α-olefin other than butene-1 as copolymer components, and a polyolefin polymer (B) having a long-chain branched structure, wherein the ratio of the mass content of copolymer (A) to the mass content of polyolefin polymer (B) is copolymer (A):polyolefin polymer (B) = 50:50 to 99:1, and the melt extension viscosity at 180°C and a strain rate of 5 / sec is 6000 Pa·s or more.

A resin composition includes: at least two monofunctional (meth)acrylates, at least one bifunctional (meth)acrylate, and at least one photoinitiator. The resin composition has a shear viscosity of about 8 mPa·s to about 50 mPa·s as measured at a temperature of about 25° C. according to JIS Z8803, and an apparent extensional viscosity of about 100 mPa·s or less under conditions of the temperature of about 25° C. and a Hencky strain of about 6.

The present invention provides a method for producing a polyethylene-based resin extruded foam sheet, which has a low apparent density even when linear low-density polyethylene is included, and a polyethylene-based resin extruded foam sheet obtained by this method, which allows for easy production of a good quality extruded foam sheet. [Solution] The method for manufacturing the polyethylene resin extruded foam sheet 1 includes an extrusion foaming step in which a foamable resin molten product, obtained by melt-kneading a polyethylene resin as a base resin and a physical foaming agent, is extruded and foamed. The polyethylene resin includes linear low-density polyethylene. The difference Tcs-Tc between the crystallization start temperature Tcs (unit: °C) and the crystallization temperature Tc (unit: °C) of the linear low-density polyethylene is 8 °C or less. Measurement temperature 150 °C, shear rate 375 s -1 The extensional viscosity λ of linear low-density polyethylene, measured by the Cogswell method under these conditions, is 50,000 Pa·s or higher.

A polypropylene resin composition having high elongational viscosity and melt strength and a method for producing the same are disclosed. The present invention provides a polypropylene resin composition having a weight average molecular weight of 250,000 to 500,000 g / mol, a molecular weight distribution MWD (Mw / Mn) of 5.5 to 12, and a content of high molecular weights with a molecular weight of 1,000,000 g / mol or more of 4 to 15 wt %.

The present disclosure aims to provide a resin composition for foam molding, an interlayer insulator, a laminate, and a foamed electric wire, each of which has a good foaming state. The present disclosure is a resin composition for foam molding, which contains a fluororesin capable of melt molding, and has a maximum value of biaxial extensional viscosity of 1 x 10 5 ~ 1 x 10 7 Pa s.

Polymer compositions can include a first polymer component containing polypropylene; a second polymer component containing a high molecular weight copolymer having a weight average molecular weight of greater than about 1 MDa; wherein the polymer composition has a peak extensional viscosity (non-annealed) at a strain rate of 1 / sec (190° C.) of greater than 55 kPa·s. Methods can include preparing a polypropylene composition by a multistage polymerization including a first stage generating a propylene polymer, and a second stage generating a high molecular weight copolymer having a weight average molecular weight of greater than about 1 MDa; wherein the polymer composition has a peak extensional viscosity (non-annealed) at a strain rate of 1 / sec (190° C.) of greater than 55 kPa·s.

A method for evaluating texture upon swallowing foods or drinks includes adjusting viscosity of the food or drink to a constant or substantially constant shear viscosity by diluting the food or drink or adding a thickening component thereto, measuring a filament diameter of the viscosity-adjusted food or drink over time using a capillary breakup extensional viscometer to calculate an extensional viscosity and an extensional strain from a change in the filament diameter, determining an index value representing the extensional viscosity in a region where the extensional strain is in a specific range, and evaluating the quality of the texture upon swallowing the food or drink from the determined index value.

Expandable particles of a regenerated styrene-based resin according to an embodiment of the present invention are obtained by forcing / infiltrating a blowing agent into particles (A) of the regenerated styrene-based resin, wherein the particles (A) of the regenerated styrene-based resin, in a measurement of uniaxial elongational viscosity under the conditions of 160°C and a constant strain rate of 0.1 s-1, have a maximum value of uniaxial elongational viscosity of 5.0×104 Pa·s to 1.0×1010 Pa·s and the particles (A) of the regenerated styrene-based resin have a weight-average molecular weight of 150,000-1,000,000.

To provide recycled foamed styrene resin particles that have a high environmental impact and improved moldability. [Solution] The recycled foamable styrene resin particles according to the embodiment of the present invention are recycled foamable styrene resin particles obtained by pressurizing and impregnating recycled styrene resin particles (A) with a foaming agent, wherein the recycled styrene resin particles (A) are subjected to a constant strain rate of 0.1 s at 160°C. -1 Under these conditions, in uniaxial extensional viscosity measurements, the maximum value of the uniaxial extensional viscosity was 5.0 × 10⁻⁶. 4 Pa·s~1.0×10 10 The molecular weight is Pa·s, and the weight-average molecular weight of the recycled styrene resin particles (A) is between 150,000 and 1,000,000.