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Patent Agency Ranking
公开(公告)号：DE3308298A1
公开(公告)日：1984-09-13
申请号：DE3308298
申请日：1983-03-09
Applicant: BASF AG
Inventor： MELZER JAROSLAV
IPC: D21C9/10
Abstract: In the process, wood pulp is reductively bleached by the action of water-soluble dithionites, formamidinesulphinic acid or water-soluble salts thereof in an aqueous medium at 40 to 100 DEG C in the presence of effective quantities of (1) 1-hydroxyethylidene-1,1-diphosphonic acid, (2) aminotri-(methylenephosphonic acid), (3) ethylenediaminetetra-(methylenephosphonic acid) and/or (4) diethylenetriaminepenta-(methylenephosphonic acid) or the sodium, potassium or ammonium salts of the said acids as complexing agents.
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公开(公告)号：CA1162338A
公开(公告)日：1984-02-14
申请号：CA357446
申请日：1980-07-31
Applicant: BASF AG
Inventor： HERTEL OTTO , SCHARF EMIL , MELZER JAROSLAV , FIKENTSCHER ROLF
Abstract: process for the production of water-soluble auxiliaries for the papermaking industry by reacting (a) 1 part by weight of a polyamidoamine obtained by condens ing 1 mole of a dicarboxylic acid having from 4 to 10 carbon atoms with from 0.8 to 1.4 moles of a polyalkylene polyamine having from 3 to 10 alkyleneamine units and containing up to 8 ethleneimine units per basic nitrogen atom with (b) 0.1 to 4 parts by weight of an .alpha..omega.-dichloro polalkylene oxide obtained by reacting a polyalkylene oxide having from 8 to 100 alkylene oxide units with a compound selected from the group consisting of a thionyl chloride and phosgene and then cleaving the reaction products by heating them to a temperature of from 70.degree. to 150.degree.c in the presence of a tertiary amine as catalyst, as crosslinking agent, at a temperature above 20.degree.c in aqueous solution or in a water-soluble organic solvent, the reaction being carried out to a point at which the viscosity of an aqueous solution containing 20% by weight of auxiliary is from 300 to 2,500mPas..
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公开(公告)号：CA1150262A
公开(公告)日：1983-07-19
申请号：CA369239
申请日：1981-01-23
Applicant: BASF AG
Inventor： HERTEL OTTO , SCHARF EMIL , MELZER JAROSLAV
IPC: C08G81/00 , C08G59/10 , C08G59/26 , C08G59/28 , C08G69/48 , C08G73/02 , D21H17/46 , D21H17/54 , D21H21/10 , C08G59/50
Abstract: A process for the preparation of water-soluble polymeric crosslinking agents by a two-stage reaction of di-secondary diamines with epichlorohydrin and/or dichlorohydrin, wherein, in the first stage, di-secondary diamines are condensed with epichlorohydrin and/or dichlorohydrin in a molar ratio of from 1:0.5 to 1:1 at a pH of from 9 to 12, and in the second stage the condensates obtained in the first stage are reacted with additional epichlorohydrin and/or dichlorohydrin at a pH of from 4 to 8.5. The watersoluble condensates thus obtained are crosslinking agents for polyamines, polyamidoamines, ethyleneimine-modified polyamidoamines and polyether-amines. The crosslinking reaction gives water-soluble condensates, which possess a high cation activity and may be used as retention aids, drainage aids and flocculants in the manufacture of paper.
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公开(公告)号：CA1050680A
公开(公告)日：1979-03-13
申请号：CA257260
申请日：1976-07-19
Applicant: BASF AG
Inventor： MELZER JAROSLAV , SCHENCK HANS-UWE
IPC: B01D21/01 , C02F1/54 , C08J3/02 , C08L33/00 , C08L33/02 , C08L33/14 , C08L33/24 , C08L33/26 , C08L77/00 , D21F1/82 , D21H17/43 , D21H17/45
Abstract: Mixtures of high molecular weigh polyacrylamides in the form of a water-in-oil polymer dispersion and containing in the inner phase from 99.99 to 95% w/w of a cationic polyacrylamide and from 0.01 to 5% w/w of an anionic polyacrylamide or from 99.99 to 95% w/w of an anionic polyacrylamide and from 0.01 to 5% w/w of a cationic polyacrylamide, all percentages being based on the total amount of polymer. The said polymer mixtures are particularly effective retention aids and flocculants and are preferably used in the manufacture of paper as pulp additives.
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