Medico-surgical and sanitary articles and materials
US4868024A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1987 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Aug 7, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31935
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Sheet material for making a water closet disposable article, such as a bag for body waste products, is unaffected by contact with water of neutral pH, but is degraded on contact with an alkali added to the pan of the water closet. The material may have a central layer of polyvinyl alcohol, an inner layer made up of at least two coatings of a blend of polyvinylidene chloride acrylonitrile copolymer with carboxylated acrylic copolymer, and an outer layer of at least two coatings of carboxylated acrylic acid. A similar sheet can be used to back an absorbent layer of a sanitary article, such as a diaper. In use, an alkaline substance containing triethanolamine and a surfactant, such as sodium dioctyl sulphosuccinate, is added in liquid form to the water closet pan prior to dropping in the bag or other article, so as to raise the pH of the water to about 10.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.