Transparent, deep-drawable and quick-sealing film with ultraviolet-blocking properties
US6479576B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2001 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Mar 22, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31855
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Described is a multi-layer film comprising, (a) at least one first layer of polyamide; (b) at least one second layer of polyethylene or an ethylene-copolymerizate containing fine-particulate titanium dioxide, a majority of the titanium dioxide particles having a diameter of between 5 and 30 nm; (c) optionally at least one EVOH-containing third layer; and (d) optionally at least one bonding layer. The multi-layer film has a value of from 5 to 200, as determined from the summation of the product of the following equation (I) for all second layers of the multi-layer film,(A×B)  Equation (I)Equation (I) is calculated for each second layer, A is the thickness of the second layer in micrometers, and B is the weight percent of titanium dioxide present in the second layer, based on the total weight of the second layer. Also described is the use of the film according to the present invention as a packaging material for foodstuffs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.