Date of Award

4-1983

Degree Name

Bachelor of Science

Department

Paper Science and Engineering

Abstract

The permeability of silicone release coatings is a function of the silicone polymer, catalyst, coat weight, and film former. Experimental results showed that increasing the amount of silicone and the coat weight of the release coating will decrease the coatings permeability. No difference in permeability was noted by changing silicone polymer or catalyst amount. Using a low molecular weight CMC (as a film former) has no effect on the permeability of the release coating. A high molecular weight CMC reduced the permeability probably due to interference of diffusion dye molecules through the film conses by the high molecular weight CMC molecules.

The adhesive release, measured by 180◦ peel adhesion test, way a function of the type and amount of silicone used, viscosity, film formers, and coat weight. Experimental work showed that as the amount of silicone increased, the adhesion of the pressure sensitive adhesive decreased. A film former (low molecular weight CMC), increased coat weight, and increased silicone content will decrease the adhesion of the adhesive. Increasing viscosity with high molecular weight CMC shows a tremendous decrease in the adhesion of the adhesive. Changing the silicone polymer showed no change in the adhesion of the adhesive. The study shows that creation of a tamper proof label is feasible concerning the permeability of the silicone release coating.

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