摘要:
A cementing composition useful in cementing oil, gas and water wells, comprising water, hydraulic cement and an effective amount of water soluble fluid loss additive comprised of a blend of a copolymer (i) of acrylamide/vinyl imidazole in a weight percent ratio of from about 95:5 to 5:95, said copolymer (i) having a molecular weight range of from about 100,000 to 3,000,000, and a copolymer (ii) of vinyl pyrrolidone and the sodium salt of vinyl sulfonate in a weight percent ratio of 80:20 to 20:80, said copolymer (ii) having a molecular weight range of from about 100,000 to 3,000,000. The blend is comprised of a weight percent ratio of copolymer (i) to copolymer (ii) in the range of 20:80 to 80:20. The composition can also optionally include a dispersant such as sodium or potassium salts or a sulfonated naphthalene formaldehyde condensate.
摘要:
Graft copolymers obtainable by free radical-initiated copolymerization of(A) a monomer mixture comprising(a) a monoethylenically unsaturated C.sub.4 - to C.sub.8 -dicarboxylic acid, or an anhydride, alkali metal salt or ammonium salt thereof,(b) a monoethylenically unsaturated C.sub.3 - to C.sub.10 -carboxylic acid, or an alkali metal salt or ammonium salt thereof,(c) if desired another monoethylenically unsaturated monomer which can be copolymerized with monomer (a) and (b), and(d) a monomer containing two or more ethylenically unsaturated, non-conjugated double bonds in the molecule, in the presence of(B) a monosaccharide, oligosaccharide, polysaccharide, oxidatively, hydrolytically or enzymatically degraded polysaccharide, oxidized, hydrolytically or enzymatically degraded polysaccharide, or chemically modified monosaccharide, oligosaccharide or polysaccharide,in the weight ratio (A):(B) of (95 to 20):(5 to 80), a process for the preparation of the graft copolymers, and detergents and cleaners containing the graft copolymers in amounts of from 0.1 to 20% by weight, are described.
摘要:
Crude oil middle distillates with improved cold flow properties, containing small amounts ofA. conventional flow improver on an ethylene base, andB. copolymers which consist of 10 to 95 mol-% of one or more acrylacrylates or alkylmethacrylates with C.sub.1 - to C.sub.26 -alkyl chains, and of 5 to 90 mol-% of one or more ethylenically unsaturated dicarboxylic acids or their anhydrides, where the copolymer is reacted to a large extent with one or several primary or secondary amines into the monoamide or amide/ammonia salt of dicarboxylic acid, and the quantitative proportion of A to B is from 40 to 60 up to 95 to 5.
摘要:
Pulverulent polymers of acrylic acid and methacrylic acid are prepared by polymerizing (a) from 100 to 70% by weight of acrylic acid, methacrylic acid or a mixture thereof and (b) from 0 to 30% by weight of vinylsulfonic acid or an alkali metal salt thereof in a monohydric C.sub.1 -C.sub.8 -alcohol, water or a mixture thereof in a pulverulent bed in the presence of a polymerization initiator and from 0.05 to 10 mol % of thiocarboxylic acid and/or a mercaptoalcohol and from 0.05 to 10 mol % of propionic acid or formic acid as regulators, each percentage being based on the monomers used in the polymerization, by maintaining the pulverulent state during the polymerization, removing the heat of polymerization by distilling off the solvent and recirculating the reaction mixture.
摘要:
Oxyalkylated, carboxyl-containing polymers are prepared by reacting(A) a polymer which contains one or more monoethylenically unsaturated C.sub.3 -C.sub.6 -carboxylic acids as copolymerized units with(B) an alkylene oxidein an aqueous medium at not more than 120.degree. C. by a process in which the reaction is started at a pH of from 5.0 to 5.9 and is ended after a pH of from 5.5 to 8.5 has been reached. As a result of monitoring of the pH, the selectivity of the addition reaction of alkylene oxides with the polymers (A) is substantially improved compared with known processes.
摘要:
Paper, board, and cardboard having high dry strength are made by adding to the paper stock a dry strength agent which is obtainable by mixing enzymatically digested starch having a viscosity of from 20 to 2,000 mPa.s (measured in 7.5% strength aqueous solution at 45.degree. C.) and a cationic polymer which contains, as typical copolymerized monomers,(a) diallyldimethylammonium chloride,(b) N-vinylamine or(c) an unsubstituted or substituted N-vinylimidazoline, the K value of the cationic polymer in each case being not less than 30, and draining the paper stock with sheet formation.
摘要:
Water-soluble copolymers having a K value of from 8 to 100 (determined according to H. Fikentscher on sodium salt in aqueous solution at 25.degree. C., a pH of 7 and a polymer concentration of the Na salt of 1% by weight) contain, in polymerized form,(a) not less than 15 mol % of one or more monoethylenically unsaturated C.sub.3 -C.sub.6 -monocarboxylic acids,(b) from 0.5 to 84.5 mol % of one or more ethylenically unsaturated C.sub.4 -C.sub.6 -dicarboxylic acids,(c) from 0 to 20 mol % of one or more hydroxyalkyl esters, where hydroxyalkyl is of 2 to 6 carbon atoms, of monoethylenically unsaturated C.sub.3 -C.sub.6 -carboxylic acids,(d) from 0 to 30 mol % of other water-soluble, monoethylenically unsaturated monomers copolymerizable with (a), (b) and (c),(e) from 0.5 to 15 mol % of a comonomer which possesses two or more ethylenically unsaturated, nonconjugated double bonds and one or more --CO--OH groups and/or their salt with an alkali metal, ammonium or alkaline earth metal base and, if required,(f) up to 10 mol % of one or more comonomers which differ from (e) and possess two or more ethylenically unsaturated, nonconjugated double bonds,are prepared by copolymerization of the monomers (a) to (f) and are used for coating seed.
摘要:
A crosscurrent heat exchanger body made up of a stack of joined, parallel flow web plates (1), and a hollow chamber (5) for flow across them between each two successive web plates, with the cover layers (2,2') of successive web plates being sloped toward one another at their ends over the hollow chamber (5) enclosed between them, and being joined tightly to one another over the entire width, is disclosed.
摘要:
A detergent contains as a grayness inhibitor in the wash and aftertreatment of textile material containing synthetic fibers a graft polymer obtainable by grafting(a) a polyalkylene oxide which has a number average molecular weight of from 300 to 100,000 and is based on ethylene oxide, propylene oxide and/or butylene oxide with(b) N-vinlypyrrolidone and(c) a vinyl ester derived from a saturated monocarboxylic acid containing from 1 to 6 carbon atoms and/or a methyl or ethyl ester of acrylic or methacrylic acid in a weight ratio (a):(b):(c) of from 1:0.3:1 to 1:5:30, the order of the addition of (b) and (c) in the graft copolymerization being immaterial and it being possible for up to 1 mole % of the grafted-on monomers (c) to be hydrolyzed.
摘要:
Water-soluble copolymers having a K value of from 15 to 120 (determined according to H. Fikentscher in an aqueous solution of their sodium salt at 25.degree. C., a pH of 7 and a polymer concentration of the Na salt of 1% by weight) contain, in polymerized form,(a) not less than 80 mol % of one or more monoethylenically unsaturated C.sub.3 -C.sub.6 -monocarboxylic acids,(b) from 0.5 to 20 mol % of a comonomer which possesses two or more ethylenically unsaturated, non-conjugated double bonds and one or more --CO--OX groups and/or their salt with an alkali metal, ammonium or alkaline earth metal base, and, if required,(c) not more than 10 mol % of one or more comonomers which differ from (b) and possess two or more ethylenically unsaturated, non-conjugated double bonds, and the said copolymers are prepared by copolymerization of the monomers (a), (b) and, if required (c) in aqueous solution and are used for coating seed.