Indicia-receptive low adhesion backsize
AssigneeMinnesota Mining and Manufacturing Company
InventorsTimothy A. Mertens, Steven S. Kantner, Kurt C. Melancon
Life of this patent
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Abstract
Pressure-sensitive adhesive tape having low adhesion backsizes and release coatings that can be written on with solvent and water-based inks, the indicia remaining firmly bonded and resisting smearing. The coatings comprise copolymers of (A) free radically polymerizable vinyl monomer, (B) polar monomer in sufficient amount to impart a hydrated Tg of -15.degree. C. to 35.degree. C. and a difference of at least 20.degree. C. between the hydrated and actual Tgs, and (C) siloxane-based polymer of a type and in an amount that will impart a satisfactory release value.
Claims16
A release agent that is a polymer having at least one vinyl polymeric segment and at least one siloxane polymeric segment, said vinyl polymeric segment having a hydrated T.sub.g between -15.degree. C. and +35.degree. C., the temperature difference between the hydrated T.sub.g and actual T.sub.g being at least 20.degree. C., said siloxane segment having a number average molecular weight above about 1,000, the amount and composition of said siloxane segment being selected to provide the release agent with a release value less than about 50 N/dm and a receding contact angle less than 25.degree., said release agent being useful as a low-adhesion backsize and also capable of being written on effectively with both solvent-based and water-based inks.
Dependencies are inferred from the claim text.