Process for the manufacture of paper and paperboard
US-2015345081-A1 · Dec 3, 2015 · US
Process for manufacturing paper and board having improved retention and drainage properties
US8999112B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8999112-B2 |
| Application number | US-201313753631-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 30, 2013 |
| Priority date | Aug 2, 2010 |
| Publication date | Apr 7, 2015 |
| Grant date | Apr 7, 2015 |
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Abstract
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A method for manufacturing a sheet of paper and/or board having improved retention and drainage properties is provided, according to which, before the formation of the sheet and/or board, at least two retention aids are added to the fibrous suspension. These two retention aids are a main retention aid corresponding to a (co)polymer having a cationic charge density above 2 meq/g, obtained by the Hofmann degradation reaction, and a secondary retention aid corresponding to a water-soluble or water-swellable polymer having an anionic charge density above 0.1 meq/g. The main retention aid is introduced into the fibrous suspension in a proportion of 100 to 800 g/t of dry pulp, and the secondary retention aid is introduced into the fibrous suspension in a proportion of 50 to 800 g/t of dry pulp and has an intrinsic viscosity IV above 3 dl/g.
First claim
Opening claim text (preview).
What is claimed is: 1. A method for manufacturing at least one of a sheet of paper and a board, comprising, before the formation of the at least one of the sheet and the board, the step of adding at least two retention aids to a fibrous suspension, at one or more injection points, the at least two retention aids comprising: a main retention aid comprising a (co)polymer having a cationic charge density above 2 meq/g, obtained by the Hofmann degradation reaction, in aqueous solution…
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Classifications
- D21H17/375Primary
Textiles & Paper · mapped topic
- D21H17/72Primary
Textiles & Paper · mapped topic
Textiles & Paper · mapped topic
Textiles & Paper · mapped topic
Textiles & Paper · mapped topic
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- What does patent US8999112B2 cover?
- A method for manufacturing a sheet of paper and/or board having improved retention and drainage properties is provided, according to which, before the formation of the sheet and/or board, at least two retention aids are added to the fibrous suspension. These two retention aids are a main retention aid corresponding to a (co)polymer having a cationic charge density above 2 meq/g, obtained by the…
- Who is the assignee on this patent?
- Faucher Gatien, Hund Rene, Spcm Sa
- What technology area does this patent fall under?
- Primary CPC classification D21H17/375. Mapped technology areas include Textiles & Paper.
- When was this patent published?
- Publication date Tue Apr 07 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).