Cross-linking of cellulose sulfate esters with tetravalent metal

Details Cross-linking of cellulose sulfate esters with tetravalent metal Cross-linking of cellulose sulfate esters with tetravalent metal

1979-07-05

1980-12-30

Griffin, Ronald W.

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

Organic compounds

Carbohydrates or derivatives

106194, 106195, 536 33, 536 36, 536 38, 536 41, C08B 514

Patent

active

042425069

ABSTRACT:
Cellulose sulfate esters are cross-linked with tetravalent metal ions at a threshold pH of about 3.0 or higher. The cross-linked products have a higher aqueous viscosity and are more highly pseudoplastic than the precursor cellulose sulfate and may also exhibit a relatively high yield point. The products may be employed in forming thickened aqueous compositions and cohesive gel-like compositions.
The presence of other metallic ions, in addition to the tetravalent metal ions, is beneficial and enhances the viscosity increase produced by cross-linking of the cellulose sulfate with the tetravalent metal ions.
The invention is directed to a process for cross-linking of cellulose sulfate esters with tetravalent metal ions, to mixtures of cellulose sulfate esters and tetravalent metal ions that may be used in producing cross-linking of the cellulose sulfate, to a cellulose sulfate product which is cross-linked with tetravalent metal ions, and to aqueous compositions containing cellulose sulfate cross-linked with tetravalent metal ions.

REFERENCES:
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patent: 3520960 (1970-07-01), Douglas
patent: 3793043 (1974-02-01), Dresie et al.
patent: 3804174 (1974-04-01), Chatterji et al.
patent: 3816150 (1974-06-01), Ishii et al.
patent: 4138535 (1979-02-01), Schweiger
patent: 4141746 (1979-02-01), Schweiger

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