Patent ID: 7439297

Claim:
A composition consisting essentially of: A) 50-99.9% by weight of at least a copolymer (1) of ethylene (E) with chlorotrifluoroethylene (CTFE) wherein CTFE is between 53 and 70% by moles, optionally containing from 0.1 to 10% by moles of a third monomer, said polymer having a crystallinity in the range 5-45%; B) 0.1-50% by weight of a fine powder of a nucleating agent, having an average particle size lower than 50 micron, and a melting temperature higher than 300° C., selected from TFE homopolymers or TFE copolymers containing at most 0.5% by moles of one or more perfluorinated comonomers, wherein said composition when submitted to thermoforming or extrusion at temperatures in the range 200°-400° C. gives foamed molded articles and foamed coatings having a void degree higher than 10% by volume.