摘要:
The invention relates to the use of biodegradable graft copolymers producible in the presence of empirically determined quantities of water from polyvinyl alcohols with a degree of saponification of 88 to 99.5 mol. % by an acid catalysed acetalisation and/or transacetylisation reaction with carbohydrates containing carbonyl groups or presumptive carbonyl groups, in which the degree of acetqalisation, expressed in carbonyl equivalents per 100 vinyl alcohol equivalents, is between 0.2 and 20, and preferably between 1 and 10, as a plasticiser for the thermoplaticisation of starch and/or starch mixtures.
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 method for the production of packaging material systems for technical and pharmaceutical individual doses uses acid-catalyzed acetalization reaction of polyvinyl alcohol with vinyl alcohol copolymers (PVACL) produced with starch or starch derivatives in conjunction with destructuring agents. In the method, vinyl alcohol copolymers (PVCL) which contain water and which are soluble in cold water are produced either beforehand or after from the films and destructuring agents are added such that the hydrogen bridges between the polymer chains are fully or partially interrupted and that the films of vinyl alcohol copolymers thus prepared are subsequently heated to temperatures below the melting or expansion intervals thereof and are further processed in a sealing process using pressure for the production of a sealing seam for packaging in the form of individual doses.
摘要:
The description relates to vinyl alcohol copolymers which can be produced by the acid-catalysed acetalisation reaction of polyvinyl alcohols with a degree of saponification of 80-99.5 mol % and preferably between 88 and 99.5 mol % with natural substances or their derivatives containing carbonyl or presumptive carbonyl groups. The description also relates to water-soluble films containing such vinyl alcohol copolymers, the solubility of which can be adjusted to the desired solution temperature. Said water-soluble films are used as packaging materials and auxiliaries, e.g. in the form of sealing lacquers.
摘要:
There is provided a process for the substitution of one or for the successive substitution of two chlorine atoms of cyanuric chloride by one or two amines whch may be the same or different in the presence of an acid binding agent and in the presence of an organic solvent, particularly for the production of 2-alkylamino-4,6-dichloro-, s-triazines and more preferably for the production of 2,4-di-(alkylamino)-6-chloro-s-triazines wherein there is used a 4 to 60 weight % solution or suspension of cyanuric chloride in a mixture of 65 to 85 weight % of one or more aliphatic hydrocarbons or cycloaliphatic hydrocarbons hving 5 to 10 carbon atoms and/or one or more aromatic hydrocarbons and 35 to 15 weight % of one or more ketones having 3 to 8 carbon atoms.
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:
There is provided a process, preferably continuous and in a given case successive, substitution of one or two chlorine atoms of cyanuric chloride by one or two amines, which may be the same or different, in the presence of an acid acceptor and in the presence of an organic solvent, particularly for the production of 2-alkylamino-4,6-dichloro and preferably for the production of 2,4-di(alkylamino)-6-chloro-s-triazines wherein there is added 1.00 to 1.05 mole, preferably 1.00 to 1.03 mole of a first amine to a 4.5 to 50 weight % suspension or solution of cyanuric chloride in a mixture of 65 to 85 weight % of xylene, toluene, ethylbenzene, benzene and/or an aliphatic or cycloaliphatic hydrocarbon with 5 to 10 carbon atoms (toluene being preferred) and 35 to 15 weight % of a ketone with 3 to 8 carbon atoms, preferably acetone, while maintaining the temperature between about 0 and about 20.degree. C, preferably about 10 to 18.degree. C., continuously so regulating the pH value of the reaction mixture obtained in accordance with the reaction time by addition of alkali and in a given case, water so that this corresponds to a point within the area bounded by lines ABCD of FIG. 1, which runs through the area beginning with the reaction time t,(step 1)= 0 until reaching a position in the area bounded by the lines BCEF and after reaching a pH of 7.0, preferably 7.2 maintains a temperature of about 10.degree. to about 60.degree. C., preferably about 25.degree. to 40.degree. C., after addition of 0.96 to 1.05, preferably 0.98 to 1.02 equivalents of alkali per mole of cyanuric chloride, adding at least an equimolar amount, preferably 1.00 to 1.02 mole of the second amine per mole of cyanuric chloride and continuously so adjusting the pH value of the reaction mixture obtained depending on the reaction time by addition of alkali that this corresponds to a point within the area which is defined by lines GHIJ in FIG. 3 which passes through the band beginning with the reaction time t(step 2)= 0 of the second reaction step until reaching a position in the area bounded by the lines HIKL and thereby maintaining a temperature of 40 to 70.degree. C., preferably 45.degree. to 55.degree. C. and thereafter working up the product in known manner wherein t.sub.1 is a time of 4 to 10 hours, preferably about 7 hours and t.sub.2 is a time of 2 to 8 hours, preferably about 6 hours and wherein the B C corresponds to the equation, pH = -(12.6/t.sub.1)+ 14.35 and the line H I corresponds to the equation pH = -(24,857/t.sub.2)+ 23.9285. There are also disclosed novel, purified mono and bis alkylamino-cyanoalkylalkylamino -- s -- triazines.
摘要:
2-Chloro-n-caproic acid and 6-substituted 2-chloro-n-caproic acids are produced from n-caproic acid or 6-substituted n-caproic acids are chlorinated in the presence of sulfur halides and phosphorus halides at elevated temperatures using for each mole of caproic acid there is used up to about 1.2 mole of chlorine and as catalyst at least one compound of the group of sulfur chlorides, sulfur bromides, phosphorus chloride and phosphorus bromide at a temperature of about 110.degree. to 130 .degree. C.
摘要:
Alkali percarbonates are prepared from aqueous alkali carbonate and hydrogen peroxide solution in the presence of polymeric carboxylates, especially those that contain in addition to carboxylate or carboxylic groups hydroxyl groups and if desired carbonyl groups and which have an average degree of polymerization of 5 to 5000.