Norland Products HiPure Liquid Gelatin

HiPure Liquid Gelatin has properties and reactivities similar to animal gelatin, but offers much easier handling characteristics. It can be mixed into water with simple stirring and the solution does not have to be heated to remain fluid. This opens a new field to manufacturers who never considered the chemical characteristics of gelatin before because of the gel properties.

Norland HiPure Liquid Gelatin is a protein molecule consisting of a complex chain of 20 amino acids. It is amphoteric in nature and offers a variety of reactive end groups, including hydroxy (OH), carboxy (COOH), and amino end groups (NH2). Reactivity will depend on the pH of the gelatin solution with amino end groups reacting on the alkaline side, and carboxy end groups reacting on the acid side. Large amounts of acids and bases should be avoided, as the gelatin will degrade in time at pH below 3.0 or above 9.0.
Although HiPure Liquid Gelatin is very water soluble, it can be made insoluble by the addition of polyvalent ion salts such as aluminum sulfate, ferric sulfate, or chrome alum. Acid chromates will also insolubilize the gelatin as the cremate will oxidize it and be reduced to trivalent chromium. Formaldehyde, gluteraldehyde, and glyoxal will likewise react with gelatin to insolubilize it.
Dry films ofHiPure are hard and somewhat brittle. If a flexible film is desired, it can be plasticized with a humectant such as glycerin or a glycol. Use 5 - 10% based on dry weight.
Although dried films are insoluble in organic solvents, the liquid gelatin will tolerate certain water miscible solvents.
Here are the toleration levels of various solvents in 100 parts of 45% Liquid Gelatin solution:

The following materials have shown compatibility with HiPure Gelatin: 

Films cast from mixtures are generally clear. When mixing emulsions with gelatin, special care must be taken to avoid undue localized concentrations which might tend to coagulate the emulsion. If water is to be added to the formula, dilution of the emulsion or latex before adding to the gelatin is suggested.

HiPure for Photographic Coatings
HiPure Liquid Gelatin is very suitable for use in photographic applications. It is deionized in the manufacturing process to remove all salts and the low molecular weight organic impurities. This gives a very pure gelatin with low ash. It should be noted that HiPure has no cysteine and very little methionine in its composition, so it is very low in sulfur.

HiPurets greatest advantage for photographic coatings is the fact that water solutions remain flowable liquids at room temperature which eliminates many of the handling problems associated with gelatin. Our liquid gelatin eliminates the need for heated coating equipment and its critical temperature and viscosity control. It mixes quickly into water with simple stirring and eliminates the problem of undissolved gelatin which cause coating flaws. HiPure also allows higher solid solutions to be formulated with the inherent advantage of faster drying time. No other gelatin is as easy to use in photographic coatings as HiPure Liquid Gelatin.

Norland HiPure Liquid Gelatin is nontoxic because it contains only pure gelatin and a combination of nontoxic preservatives. Since it is a protein material, further dilution with water will require additional preservative to prevent bacterial attack.