Manufacture of cellulosic pulp sheets
US-2015027651-A1 · Jan 29, 2015 · US
Manufacture of paper and paperboard
US9103071B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9103071-B2 |
| Application number | US-201214125401-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 20, 2012 |
| Priority date | Jun 20, 2011 |
| Publication date | Aug 11, 2015 |
| Grant date | Aug 11, 2015 |
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Abstract
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The present invention relates to a process of making paper or paperboard, the process including introducing a dual retention system into a cellulosic thin stock, subjecting the cellulosic thin stock to one or more shear stages, and then draining the cellulosic thin stock on a moving screen to form a dried sheet, wherein the dual retention system consists of a first polymeric retention aid and a second polymeric retention aid, the first polymeric retention aid is a water-soluble cationic polymer exhibiting an intrinsic viscosity of at least 6 dl/g, the second polymeric retention aid is a water-soluble cationic polymer exhibiting an intrinsic viscosity of from 4 to 9 dl/g, and the second polymeric retention aid has a greater cationic charge density than the first polymeric retention aid.
First claim
Opening claim text (preview).
The invention claimed is: 1. A process of making paper or paperboard, the process comprising: introducing a dual retention system into a cellulosic thin stock, subjecting the cellulosic thin stock to one or more shear stages, and then draining the cellulosic thin stock on a moving screen to form a dried sheet, wherein the dual retention system consists of a first polymeric retention aid and a second polymeric retention aid, the first polymeric retention aid is a water-so…
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- What does patent US9103071B2 cover?
- The present invention relates to a process of making paper or paperboard, the process including introducing a dual retention system into a cellulosic thin stock, subjecting the cellulosic thin stock to one or more shear stages, and then draining the cellulosic thin stock on a moving screen to form a dried sheet, wherein the dual retention system consists of a first polymeric retention …
- Who is the assignee on this patent?
- Jehn-Rendu Christian, Basf Se
- What technology area does this patent fall under?
- Primary CPC classification D21H17/44. Mapped technology areas include Textiles & Paper.
- When was this patent published?
- Publication date Tue Aug 11 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).