Thermoplastic polymers
AssigneeColorant Chromatics AG
InventorsAndrew Overend, Steven John Moloney, Bjorn Klaas, Bo Sjoblom
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Abstract
Thermoplastic polymers, for example fluoropolymers, are foamed by use of a solid formulation comprising thermoplastic polymer and an oxalate compound which includes a moiety selected from potassium, calcium, titanium, iron, cobalt, nickel, copper, zinc, zirconium and barium.
Claims18
A formulation for use in preparing a foamed thermoplastic polymer, said formulation comprising a thermoplastic polymer and an oxalate compound, wherein said oxalate compound includes a moiety selected from a group consisting of zinc and zirconium, wherein said oxalate compound includes 1 wt % or less of water, wherein said formulation is in the form of pellets which are homogenous, wherein said thermoplastic polymer has a melt processing temperature of at least 250° C., wherein said thermoplastic polymer is a fluoropolymer.
A formulation for use in preparing a foamed thermoplastic polymer, said formulation comprising a thermoplastic polymer and an oxalate compound, wherein said oxalate compound is selected from zinc oxalate and zirconium oxalate, wherein said oxalate compound includes 1 wt % or less of water, wherein said formulation is in the form of pellets which are homogenous, wherein said thermoplastic polymer has a melt processing temperature of at least 250° C. and is a fluoropolymer, wherein said pellets have a volume in the range 2-50 mm3, wherein said pellets include 1 to 10 wt % of said oxalate compound, 0 to 10 wt % of a nucleator and 89 to 99 wt % of said thermoplastic polymer.
Dependencies are inferred from the claim text.