Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1996-11-29
1998-10-06
Silverman, Stanley S.
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621686, 1621683, 106236, 106218, 524272, D21H 1762
Patent
active
058172149
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP96/00900 filed on Apr. 1, 1996.
1. Technical Field
The present invention relates to a rosin emulsion sizing agent for paper making and a method for paper sizing using the same.
2. Background Art
In recent years, as a sizing agent for paper making, on the basis of the request for closing a paper making system and the like, the use of a rosin emulsion type sizing agent becomes to be the main current. Also, in consideration of an evil influence in paper making under an acidic condition, such as deterioration of paper machines, among the rosin emulsion type sizing agents, a rosin emulsion type sizing agent having excellent sizing property in the neutral range is required. Also, as a dispersing agent used for the emulsion type sizing agent, as usual, from the viewpoint of fixing property, an anionic dispersing agent is used because cationized starch, a cationic polymer or the like is used as a fixing agent for a sizing agent.
As the dispersing agent, for instance, low molecular weight surface active agents such as sodium alkylsulfate, sodium alkylbenzenesulfonate and sulfuric acid ester salt of polyoxyethylene alkylphenyl ether are known. However, because the low molecular weight surface active agent largely foams during paper making, a polymer type dispersing agent which slightly foams has been used in recent years.
As the polymer type dispersing agent, for instance, in Japanese Unexamined Patent Publication No. 203031/1989 and the like, there is proposed an anionic copolymer obtained from a hydrophobic monomer such as styrene and hydrophilic monomers such as an acrylic acid type monomer and a sulfonic acid type monomer, which are main components. However, the copolymer described in the publication becomes insoluble owing to the reciprocal action on cationic chemicals such as alum not fixed with pulp and cationized starch when the amount of the hydrophobic monomer is large. As a result, emulsion is broken and aggregate is generated, and then this causes machine troubles. Conversely, when the amount of the hydrophobic monomer is small, that is, the amount of the acrylic acid type monomer having a carboxylic acid which is a weak acid becomes large, dilution stability in hard water becomes insufficient. On the contrary, when the amount of the sulfonic acid type monomer which is a strong acid becomes large, the emulsion is stably dispersed in hard water, however, aggregation force becomes strong, and as a result, because distribution of a sizing agent to papers becomes ununiform, sizing effect is lowered.
Additionally, in Japanese Unexamined Patent Publication No. 169898/1981, there is proposed emulsion obtained by using a fortified rosin as a rosin substance and using a denatured polyacrylamide as a dispersing agent. However, in the neutral range of at least pH 6, solubility in water becomes high based on dissociation of a carboxylic acid in the fortified rosin, and fixing property with pulp is lowered. Accordingly, sizing property in the neutral range cannot be sufficiently improved.
The present invention aims at providing a rosin emulsion sizing agent for paper making in which there is used a polymer type dispersing agent which is excellent in mechanical stability, hardly generates aggregate based on the reciprocal action on alum not fixed with pulp or other cationic chemicals and is excellent in stability in hard water, and furthermore, the sizing agent being excellent in sizing property (in particular, sizing property in the neutral range), and a method for paper sizing using the same.
The present inventors have earnestly studied in order to accomplish the above-mentioned object. As a result, it was found that, for the first time, there could be obtained a rosin emulsion sizing agent for paper making agreeing to the above-mentioned object, by using a specific rosin substance containing a rosin ester and the like, as a rosin substance, and combining a copolymer as a dispersing agent for the specific rosin substance, obtained from specific components composed of a hydrophilic
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Arai Daijiro
Sasaki Yoshihiro
Tani Nobuyuki
Arakawa Kagaku Kogyo Kabushiki Kaisha
Fortuna Jose S.
Silverman Stanley S.
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