147 results about "Methyl vinyl ether" patented technology

A storable, hydraulically-active, cementitious slurry is made and used to cement within subterranean foundations for oil and gas wells. The slurry is made from a hydraulically-active cementitious material, a suspending agent, and, as a retarder, boric acid. The boric acid is present in the cementitious slurry in an amount sufficient to lower the pH of the storable cementitious slurry to at least 12.0, preferably to at least 11.0 or preferably, for reasons of longevity, to a pH of at least 9.0. Generally the amount of boric acid in the cementitious slurry is between from about 1 to about 6 percent by weight. Preferred as suspending agent are iota carrageenan as well as poly (methyl vinyl ether / maleic anhydride) decadiene copolymer. The slurry remains liquid during storage. The slurry is activated when needed for cementing and is pumped into the subterranean formation where it is allowed to set.

The composition for stimulating an immune response in a subject comprises methyl vinyl ether and maleic anhydride copolymer-based nanoparticles. Said nanoparticles may further contain an allergen or an antigen and / or an immunostimulating agent, which may be contained inside said nanoparticles and / or at least partially coating the surface of said nanoparticles, and optionally a cross-linking agent. The immune response stimulating composition is useful as an adjuvant in immunotherapy and vaccines.

The invention discloses hydrogel for three-dimensional culturing of tumor cells and applications thereof, and particularly relates to applications in fundamental research related to oncology and anti-tumor drug screening. The hydrolysis product of polymethyl vinyl ether maleic anhydride, i.e., methyl vinyl ether maleic anhydride copolymer, and a hydrogel cross-linking agent polyethylene glycol are used for a cross linking reaction to prepare the hydrogel suitable for being used as a three-dimensional culture medium of various tumor cells. Compared with commercialized BME gel and Collagenl gel available on the market, the hydrogel is determined to have the capabilities of simulating in-vitro environment and supporting three-dimensional growth of growth of cells in the culture medium through researching diversity factors of cell adhesion abilities and cell growth curves on tumor cell transfer and invasion, drug resistance experiments of anti-tumor drugs and the like, thus providing a three-dimensional cell culture model for researches on tumor molecular biology characteristics, drug screening and the like.

The invention relates to a preparation method of a binary acid refined adsorbing material. According to the preparation method, co-monomers, namely beta-myrcene, vinyl methyl silicone (diol) diacetate and N,N-methylene bisacrylamide, are added into vinylidene chloride, a dispersing aid (methyl vinyl ether copolymerized maleic acid) is added to generate a polymer, and the polymer is utilized for extracting decolored binary acid with a long carbon chain. The preparation method has the advantages that the adsorbing capacity is high, and the loss of binary acid caused by the repeated crystallization and filtration can be reduced.

The invention belongs to a method for preparing a vinyl ether compound, in particular to the method for preparing 4-hydroxy butyl vinyl ether. In the reaction of 1,4-butanediol and acetylene, dimethyl sulfoxide is added so that beneficial effects are achieved for the reaction, wherein the content of a 4-hydroxy butyl vinyl ether crude product is improved to 81 percent from 72 percent before adding; and a cyclic acetal byproduct is reduced to about 4 percent from 6 percent before adding. The content of the crude product can be further improved by 1 to 2 percent by adding a cationic surface active agent, namely octadecyl trimethyl ammonium chloride.

A positive resist composition contains a novolak resin in which 3-27 mol % of the hydroxyl group hydrogens are substituted with 1,2-naphthoquinonediazidosulfonyl ester groups, a methyl vinyl ether-monoalkyl maleate copolymer and optionally, an alkali-soluble cellulose whose glucose ring substituent groups are substituted with organic groups at a specific rate. The composition is useful as a thick film photoresist which is subject to a plating step and offers many advantages including high sensitivity, perpendicular geometry, high resolution, and crack resistance during and after the plating step.

A coating composition for forming an inkjet-printable coating on a substrate is provided herein. The composition includes a cationic polymer, and an anionic polymer salt, preferably maleic anhydride / methyl vinyl ether salt (Ca / Na), e.g. GANTREZ® MS-955 (ISP). The coated substrates herein form ink images which are glossy and dry rapidly.

The purpose of the invention is to provide a biaxially-oriented porous film that is strong, has a small pore size, and exhibits superior homogeneity. The invention relates to a biaxially-oriented porous film characterized by comprising a polytetrafluoroethylene obtained from the copolymerization of tetrafluoroethylene and perfluoro(methyl vinyl ether).

A positive resist composition contains a novolak resin in which 3-27 mol % of the hydroxyl group hydrogens are substituted with 1,2-naphthoquinonediazidosulfonyl ester groups, a methyl vinyl ether-monoalkyl maleate copolymer and optionally, an alkali-soluble cellulose whose glucose ring substituent groups are substituted with organic groups at a specific rate. The composition is useful as a thick film photoresist which is subject to a plating step and offers many advantages including high sensitivity, perpendicular geometry, high resolution, and crack resistance during and after the plating step.

The present invention discloses a preparation method for special low-temperature resistant fluororubber. The method comprises: in a pressure resistant reactor, adding deionized water and special fluoroether carboxylate as a surfactant; after deoxidation of the reactor, performing heating and stirring; introducing vapor fluorine-containing monomers that comprises the following materials in percentage by weight: 20%-70% of vinylidene fluoride, 10%-40% of hexafluoropropene, 0%-70% of tetrafluoroethylene and 0%-40% of other selectable comonomer that is one of the monomers or a combination of more than one monomers selected from: perfluoro methyl vinyl ether, perfluoro ethyl vinyl ether, perfluoro propyl vinyl ether, fluoroethylene, ethylene, propylene, trifluoroethylene, chlorotrifluoroethylene, difluoro dichloroethylene, 3,3,3-trifluoropropene, and perfluoroalkyl ethylene; and then adding a free radical initiator to prepare the fluororubber, wherein the reaction temperature is controlled at 20-140 DEG C, and the reaction pressure is controlled at 1-50 atmospheric pressure, and the concentration of the special fluoroether carboxylate in the final emulsion product is 0.01%-3%.

The present invention aims to provide a biaxially stretched porous membrane having high strength, a small pore size, and excellent homogeneity. The biaxially stretched porous membrane of the present invention includes polytetrafluoroethylene obtained by copolymerizing tetrafluoroethylene and perfluoro(methyl vinyl ether).