Absorbent articles
US5804518A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1995 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Nov 6, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/678
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An absorbent article having, as a back sheet, a porous sheet obtainable by preparing, by melt blending, a melt blended solution comprising 30 to 90 parts by weight of a crystalline polyolefin and 10 to 70 parts by weight of a compound with which the crystalline polyolefin is miscible and in which the crystalline polyolefin will dissolve at or above the melting point of the crystalline polyolefin but which will phase separate below the melting point of the crystalline polyolefin, molding the blended solution into a sheet, and stretching the sheet in at least one direction. The crystalline polyolefin is a polypropylene having a weight average molecular weight (Mw) to number average molecular weight (Mn) ratio (Mw/Mn) of no more than 6.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.