Viscosity reduction of cellulose derivatives

Details Viscosity reduction of cellulose derivatives Viscosity reduction of cellulose derivatives

1976-06-14

1977-12-06

Griffin, Ronald W.

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

Organic compounds

Carbohydrates or derivatives

127 37, 536 58, 536 80, 536 82, 536 89, C08B 322, C08B 324, C08B 1120

Patent

active

040618595

ABSTRACT:
In the method of making low molecular weight cellulose ethers and esters by contacting such ethers or esters of higher molecular weight with HCl or other hydrogen halide gas, yellowing of the depolymerized or degraded product is inhibited by treating the dry material with SO.sub.2 at about ambient temperature. Residual acid in the product can be neutralized conveniently by treatment with a weak base such as ammonia or sodium bicarbonate. The low molecular weight-low viscosity product is useful in detergent compositions and in coatings for medical pills and capsules.

REFERENCES:
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patent: 1864554 (1932-06-01), Reid
patent: 1878988 (1932-09-01), Sheppard
patent: 1904406 (1933-04-01), Callahan
patent: 1946645 (1934-02-01), Staud et al.
patent: 2159377 (1939-05-01), Freeman et al.
patent: 2553725 (1951-05-01), Rogers et al.
patent: 3391135 (1968-07-01), Ouno et al.
patent: 3549617 (1970-12-01), Whitmeyer

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