Process to prepare biaxially oriented film
US10364330B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2015 |
| Grant date | Jul 30, 2019 |
| Priority date | — |
| Expiry date | Nov 12, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2477/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Processes are disclosed for preparing biaxially oriented film by forming a polymer melt of a composition which includes at least 50 wt % with respect to the total amount of the composition of a copolyamide having at least 75 wt. % monomeric units derived from either (i) caprolactam or (ii) hexamethylene diamine and adipic acid, each of which further includes units derived from diamines X and/or diacids Y and/or aminoacids Z in a summed amount of between 0.2 to 25 wt %, followed sequentially by casting and quenching a film of the polymer melt, MD-stretching of the film, TD-stretching the film, cooling the film after TD-stretching, and heat setting the biaxially oriented film. The resulting biaxially oriented film exhibits attributes suitable for use as food packaging.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.