Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1982-01-20
1983-09-20
Smith, William F.
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621643, 1621646, 1621683, 524364, 524607, 524608, 524612, 528332, D06M 1310, D21H 302
Patent
active
044054084
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
The present invention relates to a cellulose treating agent which is obtained by dispersing an alkyl keten dimer in water in the presence of a dispersing agent which comprises a reaction product of a mixture of selected carboxylic acids and polyalkylenepolyamine such as triethylenetetramine or a product obtained by reacting an epihalohydrin with said reaction product and, more specifically, to such a cellulose treating agent of the aforementioned type that is most suitably applicable as a water repellent for paper and other cellulosic product and, particularly, as a reactive sizing agent for papermaking.
BACKGROUND OF THE INVENTION
It is well-known that alkyl ketene dimers are bonded with hydroxyl groups of cellulose molecules generally to impart thereto a water repellency. Because of such properties, alkyl ketene dimers are commonly used as cellulose treating agents to impart a water repellency to paper and other cellulosic products and, especially, as reactive sizing agents for papermaking. Typical examples of alkyl ketene dimers used for such applications include decyl ketene dimer, dodecyl ketene dimer, tetradecyl ketene dimer, hexadecyl ketene dimer, octadecyl ketene dimer and the like.
Since alkyl ketene dimers are water-insoluble, they are dispersed in water by various methods for permitting them to be used as cellulose treating agents. In this connection, it is most desirable to use such an alkyl ketene dimer as a cationic dispersion for obtaining a higher effect. This is because if the alkyl ketene dimer is dispersed in water as cationic fine particles, the bonding between the alkyl ketene dimer and cellulose which shows anionic properties in water will be promoted by the attraction between the positive charges of the fine particles of the alkyl ketene dimer and the negative charges of the cellulose. Heretofore, as cationic dispersing agents for alkyl ketene dimers used for the aforementioned purpose, several substances have been proposed including cationic starch (U.S. Pat. No. 3,130,118), polyamidepolyamine-epihalohydrin resins, cationic melamine-formaldehyde resins (U.S. Pat. No. 3,046,186) and cationic urea-formaldehyde resins. However, since dispersions obtained by using these cationic dispersing agents according to the prior art are rather poor in their stability, they cannot fully exhibit an effect as cellulose treating agents.
Accordingly, an object of the present invention is to provide a solution to the foregoing problems or drawbacks of the prior art in applying alkyl ketene dimers as cellulose treating agents.
SUMMARY OF THE INVENTION
The present invention provides improved cellulose treating agents each comprising a stable cationic dispersion of an alkyl ketene dimer. Further, the present invention provides paper which is sized with the aforementioned cellulose treating agents and, particularly, paper which is most effectively sized internally therewith.
As a result of a series of studies, the inventors have found out that a highly stable cationic aqueous dispersion of an alkyl keten dimer can be obtained by dispersing it in water in the presence of a dispersing agent comprising a reaction product of an aliphatic monohydroxymonocarboxylic acid having 9 to 32 carbon atoms and polyalkylenepolyamine and/or a product obtained by reacting an epihalohydrin with said reaction product and that such a dispersion have a superior effect as a cellulose treating agent. The present invention has been achieved on the basis of the aforementioned findings by the inventors.
The reaction between an aliphatic monocarboxylic acid or aliphatic dicarboxylic acid and polyalkylenepolyamine proceeds as a reaction between the primary amino groups of the polyalkylenepolyamine and carboxyl groups of the carboxylic acid to produce an amide, and the reaction is most promoted at temperatures above 100.degree. C. or, preferably, at 150.degree. C. to 250.degree. C., and by removing from the reaction system the water which is a condensation product of the reaction, as is well known. Also, it is
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patent: 3006806 (1961-10-01), Schur
patent: 4317756 (1982-03-01), Dumas
Asakura Akira
Yamada Hideto
Yoshioka Shigehiko
Seiko Kagaku Kogyo Co., Ltd.
Smith William F.
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