摘要:
A process for improving the processability of a coating composition for paper and paper substitutes in which the composition contains at least one undissolved finely divided inorganic substance, organic substance, or mixture of such substances in a system comprised mainly of water, wherein the process comprises mixing into said system about 0.05 - 5.0 percent by weight of at least one dispersing agent consisting essentially of a polymer derived from specified units containing carboxyl, carboxylate, carbonyl and/or hydroxyl groups. A coating composition is provided.
摘要:
Process for dispersing solid, organic or inorganic colorant particles or mixtures thereof in a system comprised mainly of water by mixing into the aqueous system about 0.05 to 10% by weight of at least one dispersing agent comprising a polymer derived from specified units containing carboxyl, carboxylate, carbonyl and/or hydroxyl groups. A dispersing agent and an aqueous dispersion are provided. The process is particularly useful for dispersing pigments in aqueous systems.
摘要:
A non-foaming iodophor having a high content of active iodine comprises the product formed by mixing while heating at about 50.degree.-120.degree.C for about 0.75-15 hours a reaction mixture of:I. about 10-30 weight percent of elementary iodine; andIi. about 90-70 weight percent of an aqueous solution consisting essentially of:A. about 7-30 weight percent of at least one polycarboxylic acid, at least one polycarboxylate or mixtures of said polycarboxylic acids and polycarboxylates, having at least 65 carboxyl or carboxylate groups per 100 monomer units in the polymer chain and an average degree of polymerization (numerical average value) between about 10 and 500;B. about 0-20 weight percent of at least one alkali metal iodide, ammonium iodide, mixtures of said iodides or at least one lower, monovalent, aliphatic alcohol;C. about 0-20 weight percent of at least one non-volatile multibasic mineral acid, at least one multibasic oxycarboxylic acid, or mixtures of said acids, wherein said acids do not substantially reduce elementary iodine; andD. water in an amount sufficient so that said aqueous solution comprises 100 weight-percent. The iodophor exhibits biocidal activity.
摘要:
A process for precipitating heavy metal ion-polycarboxylate complexes from solution, said process comprising adding to a solution containing at least one of said complexes an aqueous solution of a water soluble aluminum salt, the anion of which does not form any water soluble complexes with said heavy metal ions to be precipitated or optionally such anion-heavy metal complexes having a stability constant, expressed as their decadic logarithm, of less than 2; wherein 0.9 to 1.8 moles of aluminum ions are employed per equivalent of polycarboxylate; and adjusting the pH of the resulting reaction mixture to about 6.5 to about 9.0 with an alkali metal carbonate.
摘要:
A process for decreasing the hygroscopicity of a polycarboxylate, said process comprising preparing a melt of a composition having a melting point of about 40.degree. - 120.degree. C, said composition giving an acid or neutral pH in an aqueous solution or suspension, said composition being less hygroscopic than said polycarboxylate, said composition capable of being free flowing under equilibrium conditions at about 30.degree. C and in an air atmosphere of at least about 40% relative humidity; heating said melt in a mixer to a temperature of up to about 140.degree. C; gradually adding said polycarboxylate as a powder to said melt while mixing said melt; wherein said composition comprises at least about 3 and at most about 40% by weight of the mixture resulting after all polycarboxylate has been added to said melt.
摘要:
Process for improving the water wettability of natural or synthetic zeolites, said process comprising thoroughly mixing at least one natural zeolite, synthetic zeolite or mixture of natural and synthetic zeolites with an aqueous solution of a treating agent selected from the group consisting of at least one polyelectrolytic polycarboxylic acid, at least one completely or partially neutralized polycarboxylate, or at least one mixture of said polycarboxylic acid and polycarboxylates; wherein said treating agent has at least about 40 basic mole percent carboxyl or carboxylate groups and a mean degree of polymerization (numerical mean) between about 3 and about 5000; said mixing conducted at about 0.degree. to about 100.degree.C for at least about 5 minutes; said aqueous solution employed in a concentration between about 2 and about 800 g polycarboxylic acid or polycarboxylate per liter and in such quantity that it comprises about 0.01 to about 10 parts by weight, related to one part by weight of zeolite, of the polycarboxylic acid or polycarboxylate.
摘要:
Trioxane homo-or copolymerizate is produced by continuously feeding the liquid starting material to be polymerized into a mixer in which there is present a powdered to granular oxymethylene homopolymer or copolymer which is fluidized to form a fluidized bed, the speed of feeding, catalyst concentration and polymerization temperature are coordinated to each other in suitable manner and after a polymerization reaction of at least 70 percent polymerizate is continuously or cyclically discharged from the mixer serving as reactor.
摘要:
There is prepared an iodophor solution comprising(a) 0.5 to 3 weight percent iodine,(b) 10 to 30 weight percent phosphoric acid,(c) 5 to 30 weight percent acetic acid, and(d) 0.5 to 20 weight percent of a polymerHaving an average molecular weight between 500 and 10,000 and consisting essentially of repeating units of the general formula ##STR1## where X in 90 to 65% of the cases is COOH, in 10 to 35% of the cases is ##STR2## and in 0 to 10% of the cases is CH.sub.2 OH and/or CN and/or ##STR3## the side chains being distributed statistically at random. The solution is made up with water to 100 weight percent. Preferably there is present hydrogen iodide, alkali metal iodide, alkaline earth metal iodide or ammonium iodide. Also there can be present a wetting agent such as sodium lauryl sulfate or sodium dodecylbenzene sulfonate or sodium dihexylsulfosuccinate.
摘要:
An accelerator combination is provided for the cross-linking of powder paints containing an acrylic resin containing carboxyl groups and an epoxy resin at elevated temperatures, said accelerator containing, based on the weight of said acrylic resin:(a) 0.05 to 3.0% by weight of at least one compound of the formula LiX, in which X signifies a hydroxyl ion, the anion of hydrochloric acid, hydrobromic acid, or of a saturated or unsaturated aliphatic or aromatic carboxylic acid; and(b) 0.5 to 5.0% by weight of at least one quaternary ammonium compound of the formula ##STR1## in which R.sub.1 signifies a saturated aliphatic radical, R.sub.2, R.sub.3 and R.sub.4 signify the same or different saturated aliphatic radicals, aryl radicals or aralkyl radicals, wherein two of the radicals R.sub.2 to R.sub.4 may be replaced by a group which together with the nitrogen atom forms a saturated heterocylic ring, or all radicals R.sub.2 to R.sub.4 may be replaced by a group which together with the nitrogen atom forms a pyridine ring, and in which Y.sup.- signifies a monobasic inorganic or organic acid anion.
摘要:
A radiation-hardenable agent for the scratch-resistant coating of organic glasses consists of a cocondensate of vinyl trimethoxysilane or vinyl triethoxysilane and tetramethoxysilane or tetraethoxysilane, a reactive diluent which comprises at least 2 vinyl, acrylic or methacrylic groups per molecule and, if necessary, of a known photoinitiator. The agent can be prepared by forming the cocondensate in the presence of an amount of water which is at least equivalent to the methoxy or ethoxy groups present or in the presence of a small amount of a carboxylic acid, removing all volatile portions of the reaction mixture and mixing the oily siloxane remaining as residue with the other components.