Binder for pre-moistened paper products
US4537807A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1984 |
| Grant date | Aug 27, 1985 |
| Priority date | — |
| Expiry date | Apr 16, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/2787
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A premoistened towelette or wiper type paper product having high wet strength when stored in an acidic pH medium and during usage and lower wet strength when immersed in a neutral or alkaline pH medium for disposal in conventional sewage systems comprising a non-woven fibrous web which is treated with an improved polymeric binder comprising a copolymer of glyoxal and polyvinyl alcohol which maintains high wet strength when stored for sustained periods of time in acidic pH wetting medium conventionally used for external cleansing of the human body and during usage and yet which will readily break-up during flushing. This instant invention also comprises a method of treating non-woven fibrous webs with the improved glyoxalated polyvinyl alcohol copolymer binder and drying prior to wetting in an acidic, e.g. boric acid medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.