Method for impregnating natural fibres with a polymer in aqueous dispersion and use of said fibres in composite materials
US10287410B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 7, 2015 |
| Grant date | May 14, 2019 |
| Priority date | — |
| Expiry date | Jun 17, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2377/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for impregnating strands or strips of natural fibers, using the following successive steps: i) the impregnation of the strands or strips by immersion in a bath containing a fine aqueous polymer dispersion; followed by ii) the drying of the strands or strips using a heating system, with the progressive elimination of the water and the gradual melting of the polymer, and the coating of the strands or strips and the molten polymer incorporated into the core of the strands or strips as a binder between the fibers; iii) optionally, the forming of the treated strands or strips into their final shape; and iv) the cooling of the treated strands or strips. The aqueous polymer dispersion comprises at least one semi-crystalline or amorphous polymer and, in the case of an amorphous polymer, has a Tg varying between 50° C. and 175° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.