Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1995-09-22
1999-01-05
Krynski, William
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428375, 428378, 131332, 131343, 131342, 131345, 21050029, 2105003, 21050031, 21050032, 210508, B32B 2300, A24B 1528, B01D 3900
Patent
active
058560068
ABSTRACT:
A tobacco filter material containing fibers which have a core and a surface layer which surrounds the core, wherein the core comprises a non-esterified cellulose and the surface layer comprises a cellulose ester. The fiber may be (A) a cellulose fiber coated with a cellulose ester or (B) a fibrous cellulose derivative with its surface layer esterified by an organic acid and having an average degree of substitution of not more than 1.5. Wood pulp can be used as the cellulose fiber and the amount of the cellulose ester in the coated cellulose (A) is 0.1% by weight or more. The cellulose derivative (B) has its surface layer esterified with an organic acid and retains a non-esterified core portion. This cellulose derivative may be obtained, for example, by the non-catalytic liquid phase treatment of a cellulose fiber with an organic acid and an organic acid anhydride or halide.
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Asai Tanemi
Matsumura Hiroyuki
Shibata Tohru
Shimamoto Syu
Daicel Chemical Industries Ltd.
Gray J. M.
Krynski William
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