Three-layer nonwoven composite structure
US5178932A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1992 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | Jun 17, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/671
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A nonwoven composite structure is provided which has three melt-extruded nonwoven layers, each of which includes at least a portion of a nonwoven web. The first nonwoven web is adjacent to one surface of the second nonwoven web and the third nonwoven web is adjacent to the other surface of the second nonwoven web. The first and third nonwoven webs consist of continuous and randomly deposited filaments having an average filament diameter in excess of about 7 micrometers. The second nonwoven web consists of substantially continuous and randomly deposited microfibers having an average diameter of from about 0.1 to about 10 micrometers. The microfibers of the second nonwoven web are prepared from a mixture of an additive and a second thermoplastic polymer, which additive imparts alcohol repellency to the surfaces of the microfibers. The three nonwoven layers can be prepared independently from polyolefins, polyesters, polyetheresters, and polyamides. The boundary between at least two adjacent melt-extruded nonwoven layers is indistinct in that fibers at or near the surfaces of such adjacent layers are significantly intermingled. At least one of the first and third nonwoven webs has been…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.