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2115 results about "Radical polymerization" patented technology

Free-radical polymerization (FRP) is a method of polymerization by which a polymer forms by the successive addition of free-radical building blocks. Free radicals can be formed by a number of different mechanisms, usually involving separate initiator molecules. Following its generation, the initiating free radical adds (nonradical) monomer units, thereby growing the polymer chain.

Amine organoborane complex initiated polymerizable compositions containing siloxane polymerizable components

In one embodiment the invention is a polymerizable composition comprising a) an organoborane amine complex; b) one or more of monomers, oligomers or polymers having olefinic unsaturation which is capable of polymerization by free radical polymerization; c) one or more compounds, oligomers or prepolymers having a siloxane backbone and reactive moieties capable of polymerization; and d) a catalyst for the polymerization of the one or more compounds, oligomers or prepolymers having a siloxane backbone and reactive moieties capable of polymerization. This composition may further comprise a compound which causes the organoborane amine complex to disassociate. In a preferred embodiment, the two part composition further comprises a compound which is reactive with both the b) one or more of monomers, oligomers or polymers having olefinic unsaturation which is capable of polymerization by free radical polymerization; and the c) one or more compounds, oligomers or prepolymers having a siloxane backbone and reactive moieties capable of polymerization. This composition can be polymerized by contacting the two parts of the composition. In another embodiment the invention is an organoborane amine complex comprising an alkyl borane having ligands which are alkyl, cycloalkyl or both and an amino siloxane.
Owner:DOW GLOBAL TECH LLC

Bioprosthetic tissue preparation with synthetic hydrogels

Methods for treating xenogenic tissue for implantation into a human body including in-situ polymerization of a hydrogel polymer in tissue, and tissue treated according to those methods, where the polymerization takes place in tissue that has not been fixed with glutaraldehyde. The polymerization may only fill the tissue, bind the polymer to the tissue, or cross-link the tissue through the polymer, depending on the embodiment. One method includes free radical polymerization of a first vinylic compound, and can include cross-linking through use of a second compound having at least two vinyl groups. Another method utilizes nucleophilic addition polymerization of two compounds, one of which can include PEG and can further include hydrolytically degradable regions. In one embodiment, applicants believe the in-situ polymerization inhibits calcification, and that the polymerization of tissue un-fixed by glutaraldehyde allows for improved penetration of the polymer. The methods find one use in the treatment of porcine heart valve tissue, intended to extend the useful life of the valves by inhibiting calcification. The incorporation of degradable hydrogel regions may initially fill the tissue and reduce any initial inflammatory response, but allow for later infiltration by cells to remodel the tissue.
Owner:MEDTRONIC INC

Ink-jet printing ink compositions having superior smear-fastness

Specific core-shell binders and additives for use in ink-jet printing ink compositions are provided. One class of specific core/shell binders has the general formula [AmBnC'p]x, where A and B are hydrophobic components in which A exhibits a glass transition temperature Tg between about -150° and +25° C. and B exhibits a glass transition temperature greater than 25° C., C' is a component that forms a hydrophilic or water-soluble component in the polymer chain, and has an ionic or non-ionic structure, m<30 wt %, n>40 wt %, and p<30 wt %, with the total of m+n+p=100 wt %, and x=1 to 100,000. The molecular weight (weight average) of the polymer is between about 1,000 and 2,000,000. The polymers useful in the practice of the invention are prepared by emulsifying the monomers and then conducting a free-radical polymerization in water. The foregoing binder polymer is used in conjunction with additives comprising either (a) amine alcohols having the general formulawhere R1 and R2 are independently selected from the group consisting of hydrogen, alkyl, alkoxy, aryl, and phenoxy, R is alkyl, X is selected from the group consisting of hydrogen, alkyl, aryl, -OH, -COOH, -CHO, and substituted groups or (b) organic acids (water-soluble or water-dispersive), including polymeric acids. Other additives include amines, polyalcohols, polyamines, and polyesters. In the ink compositions of the present invention, the ratio of binder (1) to colorant (pigment) is greater than 1 to 10. The concentration of the additive is within the range of 0.005 to 50 wt %. The general ink formulation comprises: 5 to 50 wt % water-miscible solvent; 0.5 to 10 wt % colorant; 0.005 to 50 wt % additive; and water.
Owner:HEWLETT PACKARD DEV CO LP

Plastic body provided with a microstructured surface

The invention relates to a process for the production of a plastics article with a microstructured surface via production of a composite composed of a backing layer composed of a thermoplastic or thermoelastic with one or more structure layers, characterized in that the structure layer(s) is/are composed of from 1 to 100% by weight of a polymethacrylate moulding composition which comprises from 80 to 100% by weight of free-radical-polymerized methyl methacrylate units and from 0 to 20% by weight of other comonomers capable of free-radical polymerization, and which has an average (weight-average) molar mass Mw of from 30 000 g/mol to 70 000 g/mol and, where appropriate, is present in a. mixture with up to 99% by weight of a polymethacrylate moulding composition which is composed of from 80 to 100% by weight of free-radical-polymerized methyl methacrylate units and from 0 to 20% by weight of other comonomers capable of free-radical polymerization, and which has an average (weight-average) molar mass Mw of from 90 000 g/mol to 200 000 g/mol and the structure layer(s) obtain microstructuring via known structuring processes, after production of the composite. The invention further relates to the plastics articles themselves which are capable of production according to the invention, and also to their uses.
Owner:ROEHM GMBH & CO KG

Emulsion deep profile/displacement control agent and preparation method of emulsion deep profile/displacement control agent containing gel microspheres of core shell structure

The invention relates to a preparation method of an emulsion deep profile/displacement control agent containing gel microspheres of a core shell structure. According to the method, materials are fed many times to carryout inverse emulsion low-temperature oxidation and reduction to initiate free radical polymerization so that water-solubility monomers (including acrylamide, ionic monomer I, the ionic monomer II and the third monomer) react with a cross-linking agent to generate the emulsion deep profile/displacement control agent containing gel microspheres of a core shell structure. The invention also relates to the emulsion deep profile/displacement control agent containing gel microspheres of a core shell structure, which is prepared by using the method. The profile/displacement control agent is a water-solubility microgel oil displacement material containing gel microspheres from nano scale to micron scale; with small initial grain size, the profile/displacement control agent can enter into the deep part of stratum; in addition, the profile/displacement control agent has high emulsion active component content and good flowability, can have volume expansion and mutual cementation under the actions of formation water and temperature according to the condition whether charges carried by the ionic monomers at a core layer and a shell layer are same or not; therefore the profile/displacement control requirements of different geological oil deposits of oil fields can be met.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

Preparation method of star polycarboxylic acid high-performance water reducing agent

ActiveCN102887979AExtended Dionon Design-Structure-PropertyExpanding the theoretical connotation of the design-structure-performance of moleculesWater reducerPollution
The invention relates to a preparation method of a star polycarboxylic acid high-performance water reducing agent. Polybasic alcohol and (methyl) acrylic acid used as main raw materials for esterification are esterified and polymerized to prepare the star polycarboxylic acid high-performance water reducing agent material: the (methyl) acrylic acid and polybasic alcohol used as reactants are esterified under the action of a catalyst to firstly prepare a star polymerizable active terminal, and free-radical polymerization reaction is carried out with unsaturated polyethenoxy ether, molecular weight regulator and unsaturated carboxylic acid monomer under the action of an initiator to prepare the star polycarboxylic acid high-performance water reducing agent. The invention is easy to control, and has the advantages of high polymerization degree, low cost and no pollution; the esterification reaction is carried out form an active core, and the free-radical polymerization is carried out to generate the chain arm, thereby implementing the polycarboxylic acid high-performance water reducing agent in a star molecular structure; and under the condition of common doping amount and low doping amount, the star polycarboxylic acid high-performance water reducing agent has better cement paste flowability and holding capacity than the traditional linear and comb polycarboxylic acid water reducing agents, and has favorable cement adaptability and concrete application performance.
Owner:GUIZHOU DR SHI TECH

Preparation method of mud resisting and slump retaining type phosphate group containing polycarboxylate superplasticizer

The invention discloses a preparation method of a mud resisting and slump retaining type phosphate group containing polycarboxylate superplasticizer. The preparation method comprises the following specific steps that 1, a halogen containing polycarboxylate superplasticizer prepolymer is prepared, wherein halogen containing unsaturated monomers, halogen containing unsaturated acid small monomers and halogen containing unsaturated polyether macromonomers or unsaturated ester macromonomers are subjected to an oxidation-reduction radical polymerization reaction to obtain the halogen containing polycarboxylate superplasticizer prepolymer; 2, the halogen containing polycarboxylate superplasticizer prepolymer and alkyl phosphate are subjected to an Arbuzov reaction to obtain a phosphate group containing copolymerization product, the pH value is adjusted after reacting is completed, water is added, and then the polycarboxylate superplasticizer is obtained. The mud resisting and slump retaining type phosphate group containing polycarboxylate superplasticizer prepared through the method has the advantages of being low in mixing amount, high in water reducing ratio, long in slump retaining time and high in mud resisting property, can avoid the adverse effect brought by mud containing aggregate in concrete and is simple in synthesis process, easy to control and low in production cost.
Owner:JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD

Phase-change material microcapsule and preparation method thereof

The invention relates to a phase-change material microcapsule and a preparation method thereof. The microcapsule is prepared by a mixed liquor of an oil-phase component and an aqueous phase component; the oil-phase component accounts for 9-30% of the mixed liquor according to the mass percentage (the same below); the oil-phase component comprises 28-49% of free radical polymerization monomer, 1-9% of crosslinker, 44-70% of organic phase-change material and 1-2% of initiating agent; the aqueous phase component comprises 80-90% of deionized water and 1-20% of emulsifier; the surface of the microcapsule has one or more than hollows, the average grain diameters of which are less than or equal to 90mum and the total volume of which accounts for 20-40% of the microcapsule according to the volume percent; the thermal decomposition temperature of the microcapsule is larger than or equal to 230 DEG C. The preparation method adopts the mass percent composition of the microcapsule and the following technique: firstly, the well-mixed oil phase component is added into the well-mixed aqueous phase solution in the temperature I and the stirring speed I, and stirred into a mixed emulsion in the stirring speed II; and then the temperature of the mixed emulsion is raised to II; and finally the mixed emulsion is filtered, separated, mixed, washed with deionized water for 2 to 5 times after being fully stirred, thus obtaining the microcapsule wet cake; or the microcapsule wet cake is dried till reaching constant weight, thus obtaining the microcapsule dry powder.
Owner:TIANJIN POLYTECHNIC UNIV

Graft polymer and moulded medical articles employing this

The present invention relates to graft polymer which is characterized in that it is formed by graft polymerization of structural units containing. a quaternary ammonium group represented by general formula (A),(R2 and R3 each represent an alkyl group with from 1 to 3 carbons, and R4 represents an alkyl group with from 3 to 18 carbons. X represents at least one type of ion selected from halogen, sulphate, hydroxide and carboxylic acid ions.),preferably to graft polymer where the structural units containing a quaternary ammonium group represented by general formula (A) are structural units which are represented by general formula (I),(R1 represents at least one species selected from hydrogen, the methyl group and the ethyl group, and n represents an integer in the range 1 to 12. A represents at least one species selected from O, S and NR5. R5 represents hydrogen or an alkyl group with 1 to 12 carbons.) orgraft polymer formed by the graft polymerization of structural units containing a quaternary ammonium group and structural units containing an alkoxypolyalkylene glycol moiety represented by the general formula (B),(n represents an integer in the range 1 to 100. R5 represents a straight-chain or branched alkylene group with from 1 to 4 carbons, and R6 represents at least one species selected from hydrogen and straight-chain or branched alkyl groups with from 1 to 4 carbons.).By applying or incorporating the graft polymer to/in medical devices which are left in the body for a long period, it is possible to prevent microbial infection arising via these medical devices.
Owner:TORAY IND INC
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