Method of producing films by means of coextrusion blow-moulding
US8377354B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2002 |
| Grant date | Feb 19, 2013 |
| Priority date | — |
| Expiry date | Apr 21, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2027/16
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a method of producing a film comprising at least one layer of a thermoplastic fluoro-polymer and at least one layer of another polymer (A). The inventive method consists in using extrusion blow molding to coextrude a fluoro-polymer and polymer (A) which adhere to one another; with a layer of another thermoplastic polymer (B) such that it forms a layer which is adjacent to the fluoropolymer/polymer (A) layer According to the invention, the thermoplastic polymer (B) is incompatible with the fluoro-polymer and polymer (A) and has adequate extrudate behavior to support the layers of fluoro-polymer and/or polymer (A). Once the coextrudate has been cooled, by separating the layer(s) of (B), at least the film is recovered, said film comprising at least one layer of a polymer selected from among thermoplastic fluoro-polymers and polymers (A).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.