Fibrous material impregnated with thermoplastic polymer of optimum molecular mass and viscosity and method for the production thereof
US12173129B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 2019 |
| Grant date | Dec 24, 2024 |
| Priority date | — |
| Expiry date | Mar 8, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2377/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention concerns an impregnated fibrous material comprising at least one continuous-fiber fibrous material in the form of a roving or a plurality of parallel rovings and at least one thermoplastic polymer matrix, characterized in that said at least one thermoplastic polymer is an amorphous or semi-crystalline polymer having a glass transition temperature such that Tg≥40° C., especially Tg≥100° C., in particular ≥120° C., the fiber content of said impregnated fibrous material being from 45 to 65% by volume, preferably from 50 to 60% by volume, especially from 54 to 60% by volume, the number-average molecular mass Mn of said thermoplastic polymer being from 11,000 to 25,000 g/mol, the melt viscosity of said thermoplastic polymer being from 80 to 1500 Pa·s, as measured by plane-plane rheology at 1 Hz and 2% deformation, at a temperature of Tg+220° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.