Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1995-05-26
1996-07-16
Acquah, Samuel A.
Paper making and fiber liberation
Processes and products
Non-fiber additive
528271, 5282955, 528332, 528392, 528403, 525418, 525540, 1621646, 162167, D21H 1754
Patent
active
055363709
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of EP93/03205 filed Nov. 16, 1993.
The present invention relates to condensates of polyalkylenepolyamines, which are obtainable by partial amidation of polyalkylenepolyamines and subsequent condensation of the partially amidated polyalkylenepolyamines with bifunctional or polyfunctional crosslinking agents, processes for the preparation of the condensates by partial amidation of polyalkylenepolyamines and condensation of the partially amidated polyalkylenepolyamines with bifunctional or polyfunctional crosslinking agents, and the use of the condensates as drainage aids, flocculants, retention aids and fixing agents in papermaking.
DE-A-2 046 304 discloses detergents which contain partially amidated polyethyleneimines as softeners. These products are prepared by reacting a polyethyleneimine with a fatty acid or with a fatty ester at elevated temperatures, for example at 150.degree. C.
DE-C-2 434 816 discloses a process for the preparation of nitrogen-containing condensates, in which polyamidoamines are grafted with ethyleneimine and the reaction products thus obtainable are reacted with .alpha.,.omega.-bis(chlorohydrin) ethers of polyalkylene oxides at from 20.degree. to 100.degree. C., and the reaction is continued until the formation of high molecular weight resins which are still just water-soluble and have a viscosity of more than 300 mPa.s, measured at 20.degree. C. in 20% strength by weight aqueous solution. The condensates thus obtainable are used as retention aids, flocculants and drainage aids in papermaking.
DE-C-2 436 386 discloses the use of nitrogen-containing condensates based on polyalkylenepolyamines as drainage accelerators and retention aids in the paper industry. The nitrogen-containing condensates are prepared by reacting polyalkylenepolyamines which contain from 15 to 500 alkyleneimine units with .alpha.,.omega.-chlorohydrin ethers of polyethylene oxides which contain from 18 to 90 ethylene oxide units, at from 20.degree. to 100.degree. C., with formation of high molecular weight resins which are still water-soluble.
DE-C-2 916 356 discloses a process for the preparation of water-soluble polyetheramines, in which di- or polyamines having from 2 to 10 nitrogen atoms are subjected to a condensation reaction with chlorohydrin ethers obtained from 1 mol of a dihydric alcohol of 2 to 5 carbon atoms, its ethoxylation products which contain up to 18 ethylene oxide units, glycerol or polyglycerol which contains up to 15 glycerol units, and at least from 2 to 8 mol of epichlorohydrin, initially in polar, water-miscible solvents in the absence of water or in the substantial absence of water, at from 110.degree. to 200.degree. C., and an alkali metal base or alkaline earth metal base is then added in an amount sufficient to neutralize at least 20% of the hydrogen chloride formed in the condensation. Thereafter, a postcondensation is also carried out. The condensation products are used as flocculants, retention aids and drainage aids in papermaking.
Of the condensates described above, the substances disclosed in DE-C-2 434 816 have proven particularly useful in practice as retention aids and drainage aids in papermaking. However, all of the abovementioned condensates have virtually no fixing action for sizes or interfering substances in papermaking. Moreover, they are more or less susceptible to interfering substances which accumulate in the paper stock owing to the increasing use of closed water circulations in paper machines.
It is an object of the present invention to provide novel substances. It is a further object to provide, for papermaking, an assistant which acts simultaneously as a fixing agent and as a drainage aid, flocculant and retention aid.
We have found that these objects are achieved, according to the invention, by condensates of polyalkylenepolyamines, which are obtainable by bifunctional or polyfunctional crosslinking agents which have, as a functional group, a halohydrin, ethoxy, aziridine or isocyanate unit or a halogen atom, least 100 mPa.s in 20% str
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Linhart Friedrich
Lorencak Primoz
Moench Dietmar
Reuther Wolfgang
Scherr Guenter
Acquah Samuel A.
BASF - Aktiengesellschaft
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