Polychrome
makes positive diazo By Mr. Bob Gumbinner
In
conjunction with Fuji Film, we made a resin for positive
presensitized plates. Delos Bown started producing this coating
which was an ester of diazo oxide with a resin we made from acetone
and pyrogallol. Because this ester had extra hydroxyl groups, it
held moisture better than the competitive plates which more difficult
to develop, especially if the positive transparency was used several
times. When Dr. Bown developed an allergy to the diazo, the
manufacturing of the positive sensitizer was moved to the building at
Cellomer in Newark where the negative diazo was being manufactured.
In the 1970s, we hired Al Deutsch, who had worked for GAF. He
developed an ester of the
diazo oxide with a six carbon alcohol which made an improved resist
for integrated circuit chips. I went to his wedding in New Jersey.
KS note;
Please see other posts on Dr. Bown
Farewell Dr. Delos Bown HERE
Dr. Bown Episode HERE
Dr. Delos Bown HERE
KS note;
Please see other posts on Dr. Bown
Farewell Dr. Delos Bown HERE
Dr. Bown Episode HERE
Dr. Delos Bown HERE