Method for suppressing pitch formation
AssigneesKurita Water Industries Ltd., Gun Ei Chemical Industry Co., Ltd.
InventorsSatoshi Wada, Yuko Okusa, Chigusa Taguchi, Yukio Abe, Michiyasu Yamazaki
Life of this patent
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Abstract
Provided are a pitch-formation suppressor and the like which can be widely applied independently of the substance that causes a pitch and of the situation to generate a pitch in a paper manufacturing process, and which can effectively suppress and prevent the troubles due to the pitch, such as foreign spots and defects in a paper, breakage of a paper, and lowering of workability. This pitch-formation suppressor comprises an alkaline solution in which a phenol resin and/or a modified phenol resin is dissolved, or an acid solution in which a phenol resin and/or a modified phenol resin is dissolved.
Claims10
A method for suppressing pitch formation, comprising:
- treating a novolak phenol resin or a resol phenol resin with a secondary reaction, thereby obtaining secondarily reacted phenol resin and wherein the secondary reaction excludes a presence of an amine and an aldehyde therein;
- and
- adding a pitch-formation suppressor comprising an alkaline solution in which the secondarily reacted phenol resin is dissolved, or an acid solution in which the secondarily reacted phenol resin is dissolved, in a paper manufacturing process.
A method for suppressing pitch formation, comprising:
- adding an aldehyde to an alkaline solution of a raw material resin selected from the group consisting of a novolak phenol resin and a resol phenol resin, thereby carrying out addition polycondensation reaction of the raw material resin with the aldehyde and obtaining a secondarily reacted phenol resin;
- and
- adding a pitch-formation suppressor comprising an alkaline solution in which the secondarily reacted phenol resin is dissolved, or an acid solution in which the secondarily reacted phenol resin is dissolved, in a paper manufacturing process,
- wherein the addition polycondensation reaction is carried out at 85° C. for 8 hours.
Dependencies are inferred from the claim text.