Invention Grant
- Patent Title: Dry strength composition, its use and method for making of paper, board or the like
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Application No.: US16969992Application Date: 2019-01-18
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Publication No.: US11427965B2Publication Date: 2022-08-30
- Inventor: Matti Hietaniemi , Asko Karppi , Jonas Konn
- Applicant: Kemira Oyj
- Applicant Address: FI Helsinki
- Assignee: Kemira Oyj
- Current Assignee: Kemira Oyj
- Current Assignee Address: FI Helsinki
- Agency: Meunier Carlin & Curfman LLC
- Priority: FI20185272 20180322
- International Application: PCT/FI2019/050036 WO 20190118
- International Announcement: WO2019/180302 WO 20190926
- Main IPC: D21H21/20
- IPC: D21H21/20 ; D21F11/00 ; D21H17/00 ; D21H17/29 ; D21H23/04

Abstract:
A dry strength composition for manufacture of paper, board or the like is disclosed. The dry strength composition includes, as a mixture, at least one anionically derivatized polysaccharide, and cationic starch having an amylopectin content ≥80 weight-%. The anionically derivatized polysaccharide and the cationic starch provide the composition with a charge density in a range of 0.1-1.5 meq/g, when measured at pH 2.8, and −0.1-−3 meq/g, preferably −0.3-−2.5 meq/g, more preferably −0.5-−2.0 meq/g, when measured as an aqueous solution, at pH 7.0. Further disclosed are a use of the composition and a method for manufacturing paper, board or the like.
Public/Granted literature
- US20210102343A1 Dry strength composition, its use and method for making of paper, board or the like Public/Granted day:2021-04-08
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