Porous laminated, super absorbent, hydratable, temperature control pack system
US6269654A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1998 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | May 15, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25D2303/0822
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A hydratable packet pad (10) comprising a series of spaced, packet cells (17) made up of a backing sheet (11), preferably of an impervious plastic sheet material, e.g., polyester film, and an upper, porous, sheet (12) permeable to water, of, for example, non-woven polypropylene without any additive(s), with a tacky sealant (13), [e.g., 22.5% ethylene-methyl-acrylate (EMA)], used to affix and seal the two sheets together in a process forming the cells and to initially hold the polymer powder in the cell areas, which are initially deposited on the film in a squat cone, prior to the cells being formed. Within each cell of the packet is a superabsorbent polymeric material (14) of a multiply-cross-linked polymer, for example, a doubly cross-linked sodium polyacrylate polymer. The superabsorbent material also preferably includes no alcohol (OH) functional groups, and the sheeting materials preferably contain no cellulose materials. The superabsorbent polymer also preferably is of the type that is particularly effective in absorbing water. In comparison to the prior art, 1994 predecessor product, the preferred embodiment of the present invention shows over an eight-to-one (>8:1) improveme…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.