Process for preparing silicate coated polypropylene film
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United States of America Patent
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-
Jan 27, 1981
Grant Date -
N/A
app pub date -
Mar 9, 1979
filing date -
Mar 9, 1979
priority date (Note) -
Expired
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Abstract
It has been found that thin oriented polypropylene film can be coated with a submicron thickness of an alkali metal silicate. The thus coated film gives excellent results when used to separate the negative from the liquid photopolymer in preparing plastic printing plates.
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