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US 5,669,985 AGranted
Movie film cleaning process
AssigneeAlbemarle Corporation
InventorsBurnell Lee, Farah D. Azarnia
Life of this patent
Estimating the term…
Abstract
This invention relates to a solvent system and process for cleaning cellulose triacetate polymer camera film. The solvent system comprises n-propyl bromide and an alkyl bromide in which the alkyl group contains 4 to 7 carbon atoms.
Claims5
A process for cleaning cellulose triacetate polymer based camera film, which process comprises immersing the film into a solvent system then removing and drying the film, wherein the solvent system is comprised of from about 40 to about 75 wt % of a n-propyl bromide product and from about 60 about to about 25 wt % alkyl bromide in which the alkyl group contains 4 to 7 carbon atoms.
Dependencies are inferred from the claim text.