Method for the preparation of cross-linked polysaccharide ethers

Details Method for the preparation of cross-linked polysaccharide ethers Method for the preparation of cross-linked polysaccharide ethers

1980-09-02

1982-03-23

Clingman, A. Lionel

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

Organic compounds

Carbohydrates or derivatives

536 87, C08G 5968

Patent

active

043213677

ABSTRACT:
In the preparation of etherified polysaccharides, the inclusion of a polyhalo methane or an alkylene dihalide in the etherification reaction mixture yields a water-soluble, cross-linked product which exhibits increased viscosities in aqueous solution. For example, the admixture of a cellulose, e.g., cotton linter; an alkali metal hydroxide; etherifying agents such as methyl chloride or propylene oxide; and 1,2-dichloroethane in a reaction diluent such as toluene can be heated to form a water-soluble, cross-linked hydroxypropyl methylcellulose exhibiting increased solution viscosities.

REFERENCES:
patent: 2650917 (1953-09-01), Moe
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patent: 3574188 (1971-04-01), Takehara et al.
patent: 4129722 (1978-12-01), Iovine et al.
patent: 4175183 (1979-11-01), Ayers
Brown, W. et al., Chem. Abs., 1972, 77, 154, 143a.
"Cellulose and Cellulose Derivatives" vol. V, Part V (Wiley-Interscience), pp. 849-850.

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