Cross-linked thermoplastic polyvinylidene fluoride compositions
AssigneeArkema Inc.
InventorsJames J. HENRY, Gregory S. O'BRIEN
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Abstract
The invention relates to polyvinylidene fluoride (PVDF) copolymer compositions that have improved crosslinking efficiency and performance. The PVDF copolymer contains a high level (>14 and preferably greater than 16 wt %) of a fluorinated comonomer, and has a high molecular weight as measured by the melt viscosity at 230°C. and 100 sec-1 of 18 to 40 kpoise. The composition can be effectively cross-linked with a low level radiation (high cross-linking efficiency). The cross-linked composition is useful in high-temperature applications, such as automotive wire and cable, and heat shrink tubing.
Claims20
A cross-linkable polyvinylidene fluoride (PVDF) composition comprising a PVDF copolymer, and said PVDF copolymer comprises from 70 to 84 weight percent of VDF monomer units, and from 16 to 30 weight percent of one or more fluorinated comonomers, wherein the melt viscosity of the PVDF copolymer prior to crosslinking is in the range of from 22 to 29 kpoise when measured at 230° C. and 100 s-1 shear rate, kpoise, and wherein said PVDF copolymer is thermoplastic.
Dependencies are inferred from the claim text.