Invention Grant
- Patent Title: Method for producing paper, and pitch removal agent
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Application No.: US15123528Application Date: 2015-03-11
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Publication No.: US10370794B2Publication Date: 2019-08-06
- Inventor: Chigusa Taguchi , Munetoshi Tomita , Hiroki Takeda
- Applicant: KURITA WATER INDUSTRIES LTD. , THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD.
- Applicant Address: JP Tokyo JP Tokyo
- Assignee: KURITA WATER INDUSTRIES LTD.,MITSUBISHI CHEMICAL CORPORATION
- Current Assignee: KURITA WATER INDUSTRIES LTD.,MITSUBISHI CHEMICAL CORPORATION
- Current Assignee Address: JP Tokyo JP Tokyo
- Agent Manabu Kanesaka
- Priority: JP2014-048237 20140311; JP2015-046941 20150310
- International Application: PCT/JP2015/057967 WO 20150311
- International Announcement: WO2015/137521 WO 20150917
- Main IPC: D21C9/08
- IPC: D21C9/08 ; D21B1/32 ; D21H11/14 ; D21H21/02 ; D21H17/36 ; D21C5/02

Abstract:
Provided is a method for producing paper and a pitch removal agent that can remove pitch efficiently.A pitch removal agent having an average polymerization degree of 300 to 2500, a saponification index of 70 to 88 mol % and satisfying, when the absorbance at a wavelength of 490 nm is designated as y (Abs) and the saponification index as x (mol %), the Numerical Formula (A) below is added to a pulp slurry during production of paper using waste paper in the step of deinking the waste paper by floatation and/or a step earlier: y=−0.0297x+b (A) (wherein, 70≤x≤88 and 2.80≤b≤3.03).
Public/Granted literature
- US20170073891A1 METHOD FOR PRODUCING PAPER, AND PITCH REMOVAL AGENT Public/Granted day:2017-03-16
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