110results about How to "High degree of branching" patented technology

A process for the conversion of linear and / or branched paraffins hydrocarbons, catalysed by an ionic liquid catalyst, in the presence of a cyclic hydrocarbon additive containing a tertiary carbon atom. The presence of the specific hydrocarbon additives influences the reaction mechanism by increasing the selectivity towards the formation of paraffin hydrocarbons with a higher degree of branching.

Tubular polymeric composite for articles such as tubing and hoses. The composite is formed of a tubular first layer of a thermoplastic block polyether amide resin (PEBA) filled with a more structured carbon black particulate filler to render it electrically-conductive, and a tubular second layer of a thermoplastic polyamide, polyester, polyolefins, or other thermoplastic resin compatible with the PEBA resin of the first material, and which second material optionally may be filled with a less structured carbon black particulate filler to render it electrically-conductive.

Disclosed is a process of controlling the degree of branch of high 1,4-cis polybutadiene without any alternation in the 1,4-cis content and the polymerization yield, in which a dialkylzinc compound represented by the following formula I is added in a controlled amount as an agent for controlling the degree of branch of high 1,4-cis polybutadiene, thus guaranteeing the optimum processability and physical properties of polymer according to the use purpose.wherein R1 and R2 are same or different and include an alkyl group containing 1 to 5 carbon atoms.

Tubular polymeric composite for articles such as tubing and hoses. The composite is formed of a tubular first layer of a thermoplastic block polyether amide resin (PEBA) filled with a more structured carbon black particulate filler to render it electrically-conductive, and a tubular second layer of a thermoplastic polyamide, polyester, polyolefins, or other thermoplastic resin compatible with the PEBA resin of the first material, and which second material optionally may be filled with a less structured carbon black particulate filler to render it electrically-conductive.

The invention discloses a method for preparing slowly-digested dextrin and belongs to the field of bio-modified starch. The method comprises the step of carrying out synergistic modification on to-be-modified starch by adopting Ro (Rhodothermus obamensi)-GBE (Glucan Branching Enzyme) and Gt (Geobacillus thermoglucosidans)-GBE. According to the method disclosed by the invention, corn starch is synergistically treated by utilizing starch branching enzymes with two different microbial sources, the Ro-GBE is firstly added to pretreat, the Gt-GBE is added later, the to-be-modified starch is catalyzed by the Ro-GBE to form a chain segment structure which is more beneficial to the further utilization of the Gt-GBE and slender-type starch molecules are transformed into chunky-type more compact branching structures under the action of the Gt-GBE, so that the slow digestibility of the modified product is more obvious; and further, through changing the adding amount of the Ro-GBE, the modification time and the state of the to-be-modified starch, the synergistic effect between the Ro-GBE and the Gt-GBE is promoted, the branching degree of the amylopectin is increased and the content of the slowly-digested and resistant starch is further increased.

The invention provides a preparation method for butadiene rubber, belonging to the field of synthesis of polymers. The preparation method is characterized in that butadiene and a branching agent undergo polymerization in an organic solvent in the presence of a nickel-series catalyst, wherein the branching agent is liquid polybutadiene. Compared with nickel-series butadiene rubber prepared in the prior art, the branched nickel-series butadiene rubber prepared in the invention has a larger application scope since the butadiene rubber liquid has low viscosity and is not prone to adhesion on wallsand the raw butadiene rubber has improved cold flow properties and good processing performance; and when the branched nickel-series butadiene rubber prepared in the invention is applied to preparation of vulcanized rubber, the prepared vulcanized rubber has good mechanical properties.

The invention provides a tert-butyl asymmetric alpha-diimine nickel complex and an intermediate, a preparation method and application thereof. The prepared nickel complex has a single catalytic activecenter, regulation of polymer molecular weight and branching degrees can be realized through changing of a ligand structure and polymerization conditions, and high catalytic activity, low cost, performance stability and the like are achieved. The preparation method is mild in condition, short in period and simple in operation condition. The nickel complex can be applied to catalysts for vinyl polymerization, the catalytic activity is up to 1.26*10<7>g mol<-1>(Ni) h<-1>, the weight-average molecular weight Mw of prepared polyethylene fluctuates in a range of 1.0-30.8*10<5>g mol<-1>, molecularweight distribution is in a range of 1.9-5.0, the remarkable performance of polyethylene molecular weight control is achieved, the nickel complex can be used for preparation of ultrahigh-molecular-weight polyethylene, and obtained polyethylene is high in branching degree and is potential polyolefin elastomer.

The invention provides a preparation method of ultra-molecule-weight polyethylene fibers, which includes steps of a), mixing ultrahigh-molecule-weight polyethylene powder with solvent which is liquid hydrocarbon at room temperature, swelling the same to obtain spinning solution, extruding the spinning solution by a double-screw extruder and dissolving the same to obtain spinning solution with the concentration ranging from 70wt% to 97.6wt%; b) spraying the spinning solution and cooling the same to obtain gel fibers; c) washing the gel fibers by oil, drying to obtain as-spun fibers; and d) drawing the as-spun fibers five times to obtain the ultra-molecule-weight polyethylene fibers with fineness of 360D. The drawing multiple ranges from 10 to 13. The ultra-molecule-weight polyethylene fibers prepared by the preparation method have the total fineness of 360D and are high in modulus and strength and low in solvent usage.

The invention relates to a preparation method of a highly branched polyvinyl alcohol-acrylamide graft copolymer. After dissolving the polyvinyl alcohol in water, blowing nitrogen gas, lowering the temperature, adding a catalyst, reacting for 10-30 minutes, and then adding a monomer mixture solution dropwise , control the dropping time for 30-90 minutes, during which the reaction temperature is controlled between 65°C-95°C, after dropping, control the temperature between 85°C-95°C for 20-30 minutes, add catalyst, and continue at 80°C React at ‑95°C for 15-25 minutes, add catalyst, take samples during the reaction to measure the viscosity, after the viscosity reaches 1500-15000 mPa.s at 25°C, add a terminator to stop the reaction, adjust the solid content, and the product is ready. The graft copolymer of the present invention has high molecular weight, many branched chains, low viscosity, less gel, good retention, and strong anti-interference ability of impurities. As a dry strength agent for papermaking, it can also Satisfactory enhancement effect is achieved.

This invention relates to a process for the increasing the octane number of a naphtha hydrocarbon feed having a predominantly paraffin content with a germanium -containing zeolite catalyst. The catalyst is a non-acidic germanium zeolite on which a noble metal, such as platinum, has been deposited. The zeolite structure may be of MTW, MWW, MEL, TON, MRE, FER, MFI, BEA, MOR, LTL or MTT. The zeolite is made non-acidic by being base-exchanged with an alkali metal or alkaline earth metal, such as cesium, potassium, sodium, rubidium, barium, calcium., magnesium and mixtures thereof, to reduce acidity. The catalyst is sulfur tolerant. The hydrocarbon feed may contain sulfur up to 1000 ppm. The present invention could be applicable to a feedstream which is predominantly naphthenes and paraffins.

The invention discloses a method for preparing slowly digestible starch by utilizing double enzymes and belongs to the field of biologically modified starch. According to the method disclosed by the invention, the starch is cooperatively treated by utilizing cyclodextrin glycosyltransferase and a starch branching enzyme; the cyclodextrin glycosyltransferase is catalyzed to generate cyclodextrin and a lot of short-chain segments are generated; a fine and long type starch molecule is converted into a short and fat structure which is a tighter branch structure under the action of the starch branching enzyme, so that the slow digestion of the starch is more remarkable. By changing an adding manner of the two enzymes, an enzyme adding amount and reaction time, a cooperative effect between the two enzymes is promoted, the content of the cyclodextrin and the branching degree of amylopectin are improved; the content of the slowly digestible starch and resisting starch is further increased andthe digestion speed of the starch is reduced; a novel concept is provided for preparing the slowly digestible starch through biological modification.

Provided by using a catalyst containing an yttrium compound is conjugated diene polymer with very low solution viscosity, improved workability, high degree of branching, and high content of cis-1,4 structures. Also provided is a rubber composition utilizing the polymer and allowing excellent dispersion of reinforcing agent. According to a method of manufacturing a conjugated diene polymer characterized by polymerizing a conjugated diene at 50 to 120° C. in the presence of a catalyst obtained from (A) an yttrium compound, (B) an ionic compound consisting of a non-coordinating anion and a cation, and (C) an organoaluminum compound, the conjugated diene polymer has the following characteristics that: (1) a ratio (Tcp / ML1+4) between a 5 wt % toluene solution viscosity (Tcp) measured at 25° C. and a Mooney viscosity (ML1+4) at 100° C. is 0.1 to 1.2; and (2) a content of cis-1,4 structures is 80% or higher, and a content of 1,2 structures is lower than 5%.