Axially oriented confined crystallization multilayer films
US9598212B2 · kind B2 · utility
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Key dates
| Filing date | Jul 14, 2014 |
| Grant date | Mar 21, 2017 |
| Priority date | — |
| Expiry date | Jul 14, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2457/20
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of forming a confined crystallization multilayer film includes coextruding a plurality of first polymer layers and a plurality of second polymer layer to form a multilayer film wherein each first polymer layer is sandwiched between second polymer layers and axially orienting the multilayer film at a temperature below the melting temperature (Tm) of the second polymer layer and to a thickness such that each first polymer layer forms a high aspect ratio substantially crystalline lamellae.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.