Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Reexamination Certificate
2005-09-06
2005-09-06
Wilson, James O. (Department: 1623)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
C536S001110, C536S056000, C536S080000, C536S090000, C536S091000, C536S096000, C536S123100
Reexamination Certificate
active
06939961
ABSTRACT:
A process for preparing low-viscosity water-soluble cellulose ethers by the oxidative decomposition of higher-viscosity cellulose ethers with hydrogen peroxide is described. The process involves: (a) forming, under conditions of intensive mixing and at temperatures of 65-125° C., a mixture of, (i) one or more higher-viscosity cellulose ethers, and (ii) an aqueous solution of hydrogen peroxide, the proportions of the mixture being selected in such a way that the hydrogen peroxide content is 0.1-10 wt. % in relation to the dry cellulose ether, the solids content of the mixture is at least 25 wt. % in relation to the total weight of the mixture; and (b) agitating continuously the mixture of step (a) at temperatures of 65-125° C. until at least approximately 90% of the hydrogen peroxide has been spent.
REFERENCES:
patent: 5480984 (1996-01-01), Angerer et al.
patent: 5708162 (1998-01-01), Hilbig et al.
patent: 1543116 (1969-07-01), None
patent: 953944 (1962-02-01), None
Akorli Godfried R.
Danesvich Jill
Gil Joseph C.
Krishnan Ganapathy
Wilson James O.
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