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US 4,362,843 AGranted
Process for producing a polymerized, heat-resistant lacquer
AssigneeInternational Business Machines Corporation
InventorsDietrich J. Bahr, Marian Briska, Klaus Schackert
Life of this patent
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Abstract
After having been pretreated by kneading at its softening temperature, a cellulose acetate is subjected to block polymerization by being kneaded with, for example, an ethylene vinyl acetate copolymerizate, at its mean softening temperature. If necessary, the block copolymerizate may be subsequently cross-linked by adding a peroxide.
Claims10
A process for producing a polymerized, heat-resistant, cellulose acetate based lacquer of a high carbon black compatibility and a high pigment absorption, preferably for record carriers coated with aluminum, characterized in that:
- initially, a higher melting polymer is homogenized by kneading at about softening temperature, whereby the quantity of plasticizer added is such that the mechanical energy of the kneading process is still transferred to the polymer,
- in that subsequently, a lower melting polymer is added and this mixture is kneaded up to homogenization at about the means softening temperature, and
- in that the copolymerizate thus obtained is processed to form a lacquer, adding pigments when desired.
Dependencies are inferred from the claim text.