Vinylidene fluoridepolymer having a fraction of non-transferred chains and its manufacturing process
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United States of America Patent
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May 20, 2008
Grant Date -
Jul 28, 2005
app pub date -
Jan 6, 2005
filing date -
Jul 16, 2001
priority date (Note) -
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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.degree. C., and at a shear rate of 100 s.sup.1, and has spherulites with a size between 0.5 and 4.mu.m.
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