Dry strength paper and process therefor
US4088530A · kind A · utility
10Cited by
3References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 6, 1976 |
| Grant date | May 9, 1978 |
| Priority date | — |
| Expiry date | May 6, 1996 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/43
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Paper of dry strength is produced by forming an aqueous solution of papermaking cellulose fibers and adding thereto a 90:10 to 98:2 copolymer of acrylamide and maleic acid followed by addition of alum. The use of the acrylamide-maleic acid copolymer allows production of paper at a much broader pH range towards the alkaline side which eliminates the need for close control of pH and which substantially reduces corrosion of the papermaking equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.