Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1992-06-01
1994-06-14
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
162147, 1621683, 162180, 1621812, 162183, D21H 2116
Patent
active
053207122
ABSTRACT:
The present invention relates to a method for sizing of paper by using a particular vinylamine polymer as a size-fixing aid. By the use of the vinylamine polymer as a size-fixing aid, it has become possible to obtain a paper having superior sizing properties by papermaking at a pH around neutrality using a hitherto known acidic sizing agents without using a neutral sizing agent. The method of the present invention further has effects that operating efficiency of papermaking is greatly improved since contaminations of a papermaking machine due to a neutral agent can be avoided, and therefore, the prices of paper can be greatly lowered. The present method has further advantages when it is applied under acidic papermaking condition of a pH of less than 5.5. In such a condition, the addition amount of alum can be decreased and the life of a papermaking machine can be prolonged. In spite of a small amount of alum added, a considerably good sizing effect can be obtained by the present method.
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patent: 4784727 (1988-11-01), Schroer et al.
patent: 4808683 (1989-02-01), Itagaki
patent: 4824913 (1989-04-01), Murao
patent: 4842691 (1989-06-01), Nakajima et al.
patent: 4957977 (1990-09-01), Itagaki
Database Paperchem, Institute of Paper Chemistry & JP-A-78014807 (Arakawa Forest) Sep. 2, 1978 "The Entire Abstract".
Nakajima Masato
Sawayama Shigeru
Chin Peter
Conlin David G.
Linek Ernest V.
Mitsubishi Kasei Corporation
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