100results about How to "Reduce polymerization" patented technology

The present invention is directed to improved drag reducing agents and methods of forming improved drag reducing agents comprising the steps of isomerizing olefin monomers to form isomerized olefin monomers, polymerizing the isomerized olefin monomers in the presence of at least one catalyst to form a polyolefin drag reducing agent having unexpectedly superior drag reduction properties when combined with liquid hydrocarbons, such as viscous crude oil. Therefore, the drag reducing agents of the present invention may be introduced into conduits, such as pipelines, to increase the flow of the hydrocarbons through the conduit.

Polymerizable compositions that include: (a) a cationically active functional group; (b) an initiation system capable of initiating cationic polymerization of the cationically active functional group; and (c) a filler composition that includes various radiopacifying fillers in an amount sufficient to render the polymerizable composition radiopaque. Components (a), (b), and (c) are selected such that the polymerizable composition polymerizes to form a polymerized composition having a Barcol hardness, measured using a GYZJ-935 meter, of at least 10 within 30 minutes following initiation of the cationically active functional group at a reaction temperature of 25° C.

The invention relates to a dental composition comprising a monomer or mixture of monomers represented by the following structure(1) with 1,2R independently selected from H, alkyl (e.g. CH3C2H5), and Phenyl, 3,4R independently selected from H, alkyl (e.g. CH3), and halogen (Cl, Br, F), 5R independently selected from H, alkyl (e.g. CH3), m, n=1, 2 and x+y=2 to 10, with the proviso that if m=n=2, than x+y=2 and if m=n=1, than x+y=4 to 10. The invention also relates to a process for producing the monomer or mixture of monomers and the use thereof especially as dental composition.

The present invention produces entrapping immobilization pellets which have high pellet strength and retain high and stable microbial activity (nitrification activity) even if a low concentration of a material involved in immobilization (such as an immobilizing material or polymerization initiator) used. The entrapping immobilization pellets in which microorganisms are entrapped and immobilized in an immobilizing material comprise a filler having a plate-like and / or needle-like crystal structure in the immobilizing material.

In general, the invention comprises a composite paste (“try-in paste”) made with the same or similar components in similar proportions as a veneer cement except part or all of the initiation system is removed or reduced to cause it to have an extended working time under the type of ambient light conditions expected during the trial placement of the veneer. Preferably, the imitator is decreased by not eliminated from the try-in paste. The invention can be presented in the form of a kit containing one or more shades of veneer cement with corresponding shades of try-in paste.

The invention relates to a dental composition comprising a monomer or mixture of monomers represented by the following structure(1) with 1,2R independently selected from H, alkyl (e.g. CH3C2H5), and Phenyl, 3,4R independently selected from H, alkyl (e.g. CH3), and halogen (Cl, Br, F), 5R independently selected from H, alkyl (e.g. CH3), m, n=1, 2 and x+y=2 to 10, with the proviso that if m=n=2, than x+y=2 and if m=n=1, than x+y=4 to 10. The invention also relates to a process for producing the monomer or mixture of monomers and the use thereof especially as dental composition.

A process for the polymerization of olefin monomers comprising contacting ethylene or a mixture of ethylene and one or more C4-8 α olefins with a catalyst composition comprising one or more Group 3-10 transition metal containing, Ziegler-Natta, procatalyst compounds; one or more alkylaluminum cocatalyts; and one or more polymerization control agents, said process being characterized in that at least one such polymerization control agent is an alkyl or aryl, ester of an aliphatic or aromatic (poly)carboxylic acid optionally containing one or more substituents comprising a Group 13, 14, 15, or 16 heteroatom.

The present invention produces entrapping immobilization pellets which have high pellet strength and retain high and stable microbial activity (nitrification activity) even if a low concentration of a material involved in immobilization (such as an immobilizing material or polymerization initiator) used. The entrapping immobilization pellets in which microorganisms are entrapped and immobilized in an immobilizing material comprise a filler having a plate-like and / or needle-like crystal structure in the immobilizing material.

The invention discloses a method for separating and cracking cyclopentadiene in C5 distillate. The method belongs to the technical field of C5 separation. In order to solve the problems that the industry requires the dimerization reaction of cyclopentadiene as much as possible; and the industry also requires the higher quality of a dicyclopentadiene product and little loss of isoprene, the invention provides the method which comprises the following steps: setting a suspension type dimerization reactor on the body of a C5 mixture rectification tower, leading liquid phase material stream from a tower plate of the rectification tower and pumping the liquid phase material stream into the dimerization reactor, making the cyclopentadiene in the material stream to have a liquid phase dimerization reaction in the suspension type dimerization reactor, and then returning the material stream back to the rectification tower from the suspension type dimerization reactor. The method can be applied to the prior industrial C5 production device and the process of one-section extraction separation and cracking of C5 distillate. The method can reduce polyreaction besides the self-dimerization of cyclopentadiene, improve the quality of the dicyclopentadiene product, reduce the loss rate of isoprene, and reduce the cyclopentadiene content in the materials as much as possible.

The invention discloses an oil slurry scale inhibitor. The oil slurry scale inhibitor is prepared from the following components in percentage by mass: 25 to 40 percent of a detergent dispersant, 6 to12 percent of a phenol-amine type antioxidant, 5 to 10 percent of a corrosion inhibitor, 0.5 to 3 percent of a detergent, 0.4 to 0.5 percent of a metal passivating agent and the balance of a solvent,wherein the detergent dispersant is polyisobutylene succinimide and / or polybutadiene mercaptohexanediol phosphate. The oil slurry scale inhibitor disclosed by the invention has a low freezing point (less than or equal to -15 DEG C), small viscosity (the kinematic viscosity is less than or equal to 50 mm<2> / s at 20 DEG C), a strong anti-oxidization capability and good thermal stability; propertiesand utilization performance of the oil slurry scale inhibitor are not influenced at relatively high temperature of 350 to 400 DEG C and the oil slurry scale inhibitor is suitable for scale inhibitionand descaling in an oil slurry system in a catalytic cracking device; the adding amount of the oil slurry scale inhibitor in oil slurry is 30 to 100 ppm; the oil slurry scale inhibitor can be used foreffectively inhibiting equipment including the oil slurry system, a pipeline, a heat exchanger and the like from being coked; the scale inhibition rate can reach 90 percent and safe and stable operation of a device is ensured.