Cellulose derivatives with a low degree of substitution

Details Cellulose derivatives with a low degree of substitution Cellulose derivatives with a low degree of substitution

1994-08-31

1996-06-04

Nutter, Nathan M.

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

Organic compounds

Carbohydrates or derivatives

536 63, 536 64, 536115, 536119, 536124, C08B 300, C08B 500, C08B 700

Patent

active

055233988

ABSTRACT:
The invention is directed to the formation of cellulose derivatives using homogenous phase reaction conditions. Cellulose is dissolved using DMAc/LiCl and a reagent system is added to promote the acylation of an appropriate acid anhydride or free carboxylic acid. One reagent system includes N,N-dicyclohexylcarbodiimide (DCC) and 4-pyrrolidinopyridine (PP). Another reagent system includes p-toluene sulfonyl chloride (TsCl) and pyridine (Py).

REFERENCES:
patent: 4307229 (1981-12-01), Liav et al.
patent: 4316983 (1982-02-01), Bollag et al.
patent: 4983670 (1991-01-01), Yates et al.

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