National Starch and Chemical Corporation

Other

Jayant K Patel

Wadym Jarowenko

Otto B Wurzburg

Roger W Rubens

A method and apparatus for implanting synthetic lenses into a human eye in which the capsular bag is first evacuated of the natural lens substance and thereafter a peripheral spreader is inserted into the evacuated capsular bag within which an expandable lens sack is received. In one alternative the spreader forms the exterior position of the lens and is thus inserted as a collapsed structure into the capsular bag and in the other alternative the spreader comprises a plurality of arcuate segments expelled through a needle into the lens capsule.

Expandable lens replacement

Starch is phosphorylated by a virtually pollution-free, continuous process whereby an aqueous reagent solution of a tripolyphosphate, orthophosphate or pyrophosphate salt or a mixture thereof is sprayed onto a moist starch cake on a rotary vacuum filter in an amount sufficient to achieve efficient impregnation of the starch cake without losing significant levels of salt to the effluent. In a preferred embodiment, the reagent solution contains alkali metal tripolyphosphate salt and is obtained by diluting a concentrated solution thereof. The thus-impregnated starch is subsequently dried and heat-reacted by known procedures to produce an orthophosphate starch monoester.

Continuous process for phosphorylating starch

Starch is phosphorylated by an improved pollution-free process which involves forming a reagent solution of an alkali metal tripolyphosphate salt in water having 20- 36% by weight of the salt dissolved therein, forming a starch cake containing no more than 45% by weight moisture, adding 2 - 30% by weight of the tripolyphosphate salt reagent solution to the starch cake, and drying and heat-reacting the thus-impregnated starch. In this process more efficient impregnation of the starch is achieved. The impregnation is preferably effected in a centrifuge.

Growing community of inventors

North Plainfield, NJ, United States of America

Jayant K Patel