Patent ID: 6337373
Filing Date: 2002-01-08
Classification: C08F,C08J

Abstract:
A fluorine-containing graft copolymer comprising a backbone of an olefin polymer material to which is graft polymerized (a) at least one fluorinated gaseous monomer having the formula CR1R2&boxH;CR3R4, where R1=H, F, or Cl; R2=H, F, or Cl; R3=H, F, CH3, CF3, or Cl, and R4=H, F, or Cl, wherein at least two fluorine atoms are present, and, optionally, (b) at least one non-fluorinated monomer selected from the group consisting of (i) vinyl-substituted aromatic, heterocyclic, and alicyclic compounds, (ii) unsaturated aliphatic nitriles, and (iii) unsaturated aliphatic monocarboxylic acids or esters thereof, wherein the total amount of monomers added is about 1 to about 100 parts per hundred parts of the olefin polymer material, and wherein the particulate olefin polymer material has a weight average diameter of about 0.4-7 mm, a surface area of at least 0.1 m2/g, and a pore volume fraction of at least about 0.07 and wherein more than 40% of the pores in the particle have a diameter greater than 1 micron.