Patent ID: 8118975

Claim:
A printable thermally stable uncoated paper, comprising: a) non-granular, fibrous or film-like polymer fibrids in the form of very finely-divided filmy or irregular fibrous shape particles comprising a polymer or copolymer derived from an amine monomer selected from the group consisting of 4,4′diaminodiphenyl sulfone, 3,3′diaminodiphenyl sulfone, and mixtures thereof, the fibrids having an average maximum dimension of 0.1 to 1 mm, a ratio of maximum to minimum dimension of 5:1 to 10:1, and a thickness of no more than 2 microns; and b) at least one high performance floc selected from the group of para-aramid, meta-aramid, carbon, glass, liquid crystalline polyester, polyphenylene sulfide, polyether-ketone-ketone, polyether-ether-ketone, polyoxadiazole, polybenzazole, and mixtures thereof, the floc having a length of from 2 to 25 mm; wherein, the weight ratio of fibrids to floc in the paper composition is from 95:5 to 10:90; and wherein the polymer fibrids are present in the paper in an amount of at least 20 weight percent and provide sites for accepting a printing ink on a surface of the paper.