65 results about "Extensional viscosity" patented technology

The present invention relates to starch compositions which contain starch and additives. The starch has a weight average molecular weight ranging from about 1,000 to about 2,000,000. The additives can be plasticizers or diluents. The composition containing the starch and the additive is formed by means of passing the composition through a die to produce fibers, foams or films. These compositions have an extensional viscosity in the range from about 50 to about 20,000 pascal seconds. The starch compositions preferably contain a polymer that is substantially compatible with starch and has a weight-average molecular weight of at least 500,000.

A micro-rheometer for measuring flow characteristics such as viscosity, elasticity, and flow rate of a sample liquid combines well defined micro-fabricated flow channels having geometry changes forming a constriction region therein to a monolithically fabricated pressure sensor arrays. The pressure sensor array positions pressure sensors to measure the viscosity of the sample liquid while flowing in a uniform length of the flow passage and to measure the extensional viscosity while flowing through the constriction region of the passage. The invention can improve the measurement accuracy of the flow rate, viscosities, or elasticities over a wide range of shear rate. The accuracy of the viscosity over a broader range of shear rate or flow rate measurement over broader range of flow rates can be accomplished by employing monolithically integrated pressure sensors fabricated with different sensitivities disposed in a known manner. The invention further includes necessary components such as a display, a pumping system, valve manifolds, and software for a portable or laboratory measurement instrument, process control, and high throughput measurements.

Non-thermoplastic starch fibers having no melting point and having apparent peak wet tensile stress greater than about 0.2 MegaPascals (MPa). The fibers can be manufactured from a composition comprising a modified starch and a cross-linking agent. The composition can have a shear viscosity from about 1 Pascal.Seconds to about 80 Pascal.Seconds and an apparent extensional viscosity in the range of from about 150 Pascal.Seconds to about 13,000 Pascal.Seconds. The composition can comprise from about 50% to about 75% by weight of a modified starch; from about 0.1% to about 10% by weight of an aldehyde cross-linking agent; and from about 25% to about 50% by weight of water. Prior to cross-linking, the modified starch can have a weight average molecular weight greater than about 100,000 g/mol.

A composition for polyolefin resin foam, which comprises a polymer component comprising a polyolefin resin and a rubber and/or thermoplastic elastomer, and a powder particle, wherein the composition has an extensional viscosity as measured with a capillary rheometer (temperature, 200° C.; shear rate, 5,000 [1/s]) of from 20 to 100 kPa·s.

The invention relates to a foamable polymeric composition, comprising a thermoplastic elastomer on the basis of a polyolefin and a rubber; the invention is characterized in that the polyolefin is a polypropylene homo- or copolymer having:a weight average molecular weight, Mw, of at least 2*105, andan elongational viscosity (measured at a temperature of 170° C., at a rate of elongation of 0.03 s-1 and at a time of 10 s), EV(170/10), of at least 1.4*105 Pa.s.The invention relates also to a process for foaming a polymeric composition, as well as to a foamed thermoplastic article.

The invention provides a cutting resistant ultrahigh molecular weight polyethylene fiber, a preparation method and application thereof. The cutting resistant ultrahigh molecular weight polyethylene fiber includes: ultrahigh molecular weight polyethylene fiber; and hard fiber dispersed in the ultrahigh molecular weight polyethylene fiber. Specifically, the ultrahigh molecular weight polyethylene fiber and the hard fiber are in a mass ratio of 100:(2-8). Compared with the prior art, according to the cutting resistant ultrahigh molecular weight polyethylene fiber provided by the invention, on the basis of meeting the cutting resistant performance EN388 five-grade standard, through control of the content of the hard fiber, the extension viscosity of a spinning solution in the preparation process is improved, thus further improving the mechanical properties of the finished fiber product, the obtained finished fiber product has high strength, and also has small end breakage number. Experimental results show that the cutting resistant ultrahigh molecular weight polyethylene fiber provided by the invention has strength up to 26.9cN/dtex, elongation at break up to 5%, and an end breakage number of less than or equal to 1 per million meters.

The invention provides an aqueous shampoo composition comprising, in admixture: (i) a first anionic surfactant in which the ratio between the molecular weights of the polar (hydrophilic) and non-polar (hydrophobic) parts of the molecule is less than 1.5; (ii) a second anionic surfactant in which the ratio between the molecular weights of the polar (hydrophilic) and non-polar (hydrophobic) parts of the molecule is greater than 1.5, and (iii) a cationic polymer having a molecular weight of at least 100,000 Dalton and a cationic charge density of at least 0.5 meq/g; in which the weight ratio of (i):(ii) ranges from 3:1 to 1:3. Shampoo compositions according to the invention demonstrate reduced extensional viscosity (i.e. are less “stringy”). They also provide for the delivery of a significantly increased level of conditioning without any significant increase in product stringiness.

Alkaline spray-on cleaners that can be delivered by pump or pressurized gas aerosol spray have been made with reduced choking mists are disclosed. The cleaning composition comprises the use of anti-mist components consisting of large anionic copolymer comprised of acrylamide and AMPS (acrylamide-sodium 2-acrylamido-2-methylpropane sulfonate), and polyethylene oxide polymers that create non-Newtonian solutions. The composition also includes a surfactant, and a source of alkalinity.

A propylene-based polymer which is suitably applicable to foam molding, sheet molding, blow molding or the like, because of having good flow characteristics, high melt tension, high swell ratio and thus good molding workability.

It is attained by a propylene-based polymer or the like characterized by satisfying the following requirements (i) to (vi).

Requirement (i): MFR is 0.1 g/10 minutes to 100 g/10 minutes.

Requirement (ii): Q value by GPC is 3.5 to 10.5.

Requirement (iii): ratio of components with a molecular weight of equal to or higher than 2,000,000, in a molecular weight distribution curve obtained by GPC, is equal to or larger than 0.4% by weight and less than 10% by weight.

Requirement (iv): components, which elute at a temperature of equal to or lower than 40° C., are equal to or less than 3.0% by weight, in temperature rising elution fractionation by ODCB.

Requirement (v): isotactic triad fraction (mm) measured with ¹³C-NMR is equal to or higher than 95%.

Requirement (vi): strain hardening degree (λmax), in measurement of extensional viscosity, is equal to or higher than 6.0.

A propylene-based polymer comprising the following component (A) insoluble in p-xylene at 25° C. and component (B) soluble in p-xylene at 25° C., wherein (i) the weight average molecular weight (Mw) measured with GPC is 100,000 to 1,000,000, (ii) the content of the component insoluble in hot p-xylene is 0.3% by weight or lower, and (iii) the degree of strain hardening (λ max) in measurement of elongational viscosity is 2.0 or higher; and a method for producing the same, along with a resin composition comprising a propylene-ethylene copolymer (Z) in an amount of 50.0 to 99.9% by weight and a propylene-based polymer (M) in an amount of 0.1 to 50.0% by weight.

Component (A): a component (CXIS) insoluble in p-xylene at 25° C., having requirements specified by (A1) to (A5). Component (B): a component (CXS) is soluble in p-xylene at 25° C., having requirements specified by (B1) to (B4).

Nutritional products having improved cohesiveness for promoting safer swallowing of food boluses for patients having swallowing conditions are provided as well as methods of making and using such products. The nutritional products may include nutritional compositions and high molecular weight, water-soluble polymers such that the nutritional products have extensional viscosities that provide improved cohesiveness to the nutritional products. Methods of administering such nutritional products to patients having impaired swallowing ability and/or dysphagia are also provided.

A process for the production of singly and/or multiply coated paper and/or board, except for photographic papers and self-adhesive labeling papers, which are particularly suitable for printing, packaging and inscription, is described. The substrate, for example base paper or board, is coated once or several times with a free-falling liquid curtain, the coating liquid having in particular an extensional viscosity of from 1 to 1000 Pa·s at a Hencky strain of from 1 to 15.

The invention relates to a method for preparing a graft modified high melt elasticity and high extensional viscosity foamed polypropylene material (PP-g-GMA/ST). Dicumyl peroxide is adopted as an initiator for hydrogen elimination reaction to form a PP macro-radical bond; the radical bond may generate graft or chain scission reaction; the reaction activity of ST serving as a co-initiator is higher than that of GMA; the ST is grafted to the PP in priority; after a more stable styryl macro-radical is formed, the styryl macro-radical is reacted with glycidyl methacrylate to realize the branching of polypropylene in a double screw extruder serving as a reactor; and the grafting rate of the PP can be improved. The method can prepare the graft modified high melt elasticity and high extensional viscosity foaming polypropylene material (PP-g-GMA/ST). The PP with high grafting rate can improve the melt strength and the extensional viscosity of a PP system and the strain hardening. The high melt strength and high extensional viscosity can promote the stable increase of air bubbles, block the rapid diffusion of air, reduce the combination of the air bubbles, limit the breakage of bubble pores, and improve the foaming molding of the PP material. The added inorganic nano nucleating agent refines crystal grains of a polypropylene structure, destroys polypropylene crystallinity to strengthen the viscosity of a fusant when the polypropylene is heated and melted, and enlarges a temperature range suitable for foaming molding.

A polypropylene resin sheet which shows sufficiently reduced drawdown with excellent melt elongation and further has good heat resistance and good appearance. The polypropylene resin sheet may be formed from a polypropylene resin composition, the polypropylene resin composition containing: 60% to 97% by weight of a first polypropylene resin having a melt flow rate range of 0.1 to 10 g/10 min, and 3% to 40% by weight of a modified polypropylene resin having a elongational viscosity ratio to the first polypropylene resin of at least 1.5, at a strain of 3, obtained by melt kneading a second polypropylene resin, a conjugated diene compound, and a radical polymerization initiator.

Provided is a toner including a toner particle containing an amorphous resin, a colorant, a release agent, and a crystalline resin, wherein, when η_0.01 represents the extensional viscosity of the toner at a Hencky strain at 90° C. of 0.01 and η_0.69 represents the extensional viscosity of the toner at a Hencky strain at 90° C. of 0.69, η_0.01 and η_0.69 satisfy the relationships of the following formulas (1) and (2):

3.0×10⁴ Pa≦η_0.01≦2.0×10⁵ Pa  formula (1)

2.0≦[η_0.69/η_0.01].  formula (2)

A purpose of the present invention is to provide an inner liner for pneumatic tires, which has excellent melt moldability and thus has high gas barrier properties and is capable of maintaining the characteristics such as the gas barrier properties even in cases where the inner liner experiences deformation such as stretching or bending when in use. Another purpose of the present invention is to provide a method for producing an inner liner having the above-mentioned characteristics, while suppressing increase of the production cost. The present invention is an inner liner for pneumatic tires, which comprises eight or more resin layers, and which is characterized in that: the inner liner comprises, as the resin layers, a layer (A) that is formed of a resin composition containing a gas barrier resin and a layer (B) that is arranged adjacent to the layer (A) and formed of a resin composition containing an elastomer; both of the elongational viscosity (EtaA) of the resin composition of the layer (A) and the elongational viscosity (EtaB) of the resin composition of the layer (B) at a predetermined temperature are 1,000 Pas or more; and the elongational viscosity ratio EtaA/EtaB is 0.2-10 (inclusive).

The invention relates to a method for amino-terminated hyperbranched polyester, in particular relates to a method for preparing amino-terminated hyperbranched aliphatic polyester and application thereof, and belongs to the technical field of hyperbranched polymer synthesis. The method for preparing the amino-terminated hyperbranched aliphatic polyester comprises the following steps: adding a certain amount of hydroxyl-terminated hyperbranched aliphatic polyester and high melting point amino carboxylic acid into a reaction container, heating and melting at a heating temperature of 80-180 DEG C,adding a certain metering ratio of catalyst into a reaction system, continuing the reaction for 3-10 hours under the conditions of stirring and vacuumizing, and cooling to obtain a target product. The method has the beneficial effects that the hardness of conventional epoxy resin sold on the market is improved, the reactivity of the terminal amino group and the epoxy group of the epoxy resin is better, and the obtained epoxy resin has good tensile strength, elongation at break and tensile viscosity strength under the same test conditions.