Vinylidene fluoridepolymer having a fraction of non-transferred chains and its manufacturing process
US7375159B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 6, 2005 |
| Grant date | May 20, 2008 |
| Priority date | — |
| Expiry date | May 4, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L55/005
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Blends of PVDF (polyvinylidene fluoride) homopolymer or copolymer with ABC triblock copolymers are useful for manufacturing parts which may be sheets, film, tubes, rods, centrifugal pump components and containers. The PVDF comprises a fraction of non-transferred chains of very high molar mass which are insoluble in the usual solvents for PVDF, such as DMF (dimethylformamide), DMSO (dimethyl sulphoxide) and NMP (N-methylpyrrolidone), the polymer fraction associated with these high-mass chains having a dynamic viscosity of greater than 50 kpoise at 230° C., and at a shear rate of 100 s1, and has spherulites with a size between 0.5 and 4μm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.