Fine cellulose particles and process for production thereof

Details Fine cellulose particles and process for production thereof Fine cellulose particles and process for production thereof

1990-05-25

1991-11-12

Nutter, Nathan M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

536124, 536126, C08J 316, C08L 102, C08B 1510

Patent

active

050649507

ABSTRACT:
Fine crosslinked cellulose particles, wherein (1) said cellulose particles are composed substantially of a II-type cellulose crystalline phase and a non-crystalline cellulose phase, (2) said cellulose particles have a crystallinity, determined by X-ray diffractometry, of 5 to 35%, (3) said cellulose particles consist substantially of spherical to elongated spherical particles having an average particle diameter of not more than 300 .mu.m, and (4) said cellulose particles having an exclusion limit molecular weight by polyethylene glycol of not more than 4,000. The particles may have crosslinkage among the cellulose molecular chains in the non-crystalline phase. The fine crosslinked cellulose particles are prepared by (1) preparing fine particles of a coagulated viscose of cellulose xanthate, (2) subjecting the fine particles of coagulated viscose to crosslinking reaction and then neutralizing them with an acid, or first neutralizing said fine particles with an acid and then subjecting the neutralized particles to crosslinking reaction, and (3) separating the resulting fine crosslinked cellulose particles from the mother liquor, and heat-treating them after optionally subjecting them to desulfurization or to washing with an acid, water or methanol.

REFERENCES:
patent: 3501419 (1970-03-01), Bridgeford
patent: 4055510 (1971-10-01), Peska et al.
patent: 4169121 (1979-09-01), Pietsch et al.
patent: 4312980 (1982-01-01), Motozato et al.
patent: 4461892 (1984-07-01), Nishikawa et al.
patent: 4536217 (1985-08-01), Loth et al.
patent: 4551389 (1985-11-01), Ohtake et al.

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