Abstract: Fibers of narrow cross section for use in tobacco filters composed of cellulose acetate fibers in which the fiber cross section is in a rectangular configuration and the longer/shorter diameter ratio thereof is greater than 5.5.Filters of high filtering performance can be manufactured with a relatively small fiber filling rate.

Abstract: A tobacco smoke filter for use suitable in cigarettes comprising cellulose acetate filaments which have a C-shaped cross section. Such filter shows a good filtration performance with less impairment of the tobacco taste or flavor.

Abstract: A cigarette filter composed of a bundle of cellulose acetate filaments having at least two different filament denier sizes randomly distributed in the direction perpendicular to the longitudinal axis of said filter.

Abstract: A new impact-resistant ABS resin composition is disclosed comprising (1) 100 parts by weight of a graft copolymer of vinyl aromatic monomer and vinyl cyanide monomer, said copolymer being grafted onto butadiene rubber particles of a size of from 0.5 to 2.0 .mu. dispersed in the graft copolymer and (2) 1 to 10 parts by weight of a straight chain saturated polyester having an average molecular weight of from 1000 to 50000. The composition is prepared by the bulk-suspension two stage polymerization of vinyl aromatic monomer and vinyl cyanide monomer in the presence of butadiene rubber component. The polyester is incorporated during either the bulk polymerization stage or the suspension polymerization stage, or it is blended with the ABS polymer after the two stage polymerization is completed.