Paper and methods of making paper
US-9212453-B2 · Dec 15, 2015 · US
Method for increasing the dry strength of paper, paperboard, and cardboard
US8926797B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8926797-B2 |
| Application number | US-201013376509-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 7, 2010 |
| Priority date | Jun 16, 2009 |
| Publication date | Jan 6, 2015 |
| Grant date | Jan 6, 2015 |
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Abstract
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Process for the production of paper, board and cardboard having high dry strength by addition of (a) at least one trivalent cation in the form of a salt, (b) at least one water-soluble cationic polymer and (c) at least one water-soluble amphoteric polymer to the paper stock, draining of the paper stock with sheet formation and subsequent drying of the paper products, the water-soluble cationic polymer (b) being selected from the group consisting of the (i) polymers comprising vinylamine units and (ii) polymers comprising ethylenimine units.
First claim
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The invention claimed is: 1. A process for producing a paper, board, or cardboard product having high dry strength, the process comprising: adding (a) a trivalent cation in the form of a salt, (b) a water-soluble cationic polymer, and (c) a water-soluble amphoteric polymer, to a paper stock, thereby forming a resulting paper stock; draining the resulting paper stock, thereby forming at least one sheet; and subsequently drying the at least one sheet, thereby forming the paper,…
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- What does patent US8926797B2 cover?
- Process for the production of paper, board and cardboard having high dry strength by addition of (a) at least one trivalent cation in the form of a salt, (b) at least one water-soluble cationic polymer and (c) at least one water-soluble amphoteric polymer to the paper stock, draining of the paper stock with sheet formation and subsequent drying of the paper products, the water-solubl…
- Who is the assignee on this patent?
- Jehn-Rendu Christian, Krueger Ellen, Haehnle Hans-Joachim, and 4 more
- What technology area does this patent fall under?
- Primary CPC classification D21H21/18. Mapped technology areas include Textiles & Paper.
- When was this patent published?
- Publication date Tue Jan 06 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).