Increased regrind use in coextruded structures
US4999254A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1990 |
| Grant date | Mar 12, 1991 |
| Priority date | — |
| Expiry date | Sep 21, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/3192
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A laminate, a method for making the laminate and articles formed from the laminate are disclosed. The laminate comprises an outer layer, an optional adhesive layer, an inner layer, an intermediate regrind layer formed of a blend of the materials from which the other layers are formed, and, interposed between the outer layer and the intermediate regrind layer, there is a buffer layer which is formed from a blend of the materials from which the outer layer and the intermediate regrind layer are formed and which comprises at least about 5% of the material of the intermediate regrind layer. The outer layer is preferably polypropylene and the inner layer is preferably an ethylene vinyl alcohol copolymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.