Supercritical fluid pressure sensitive adhesive polymers and their preparation
AssigneeNitto Denko Corporation
InventorsVincent D. McGinniss, Bhima R. Vijayendran, Kevin B. Spahr, Kazuhiko Shibata, Takayuki Yamamoto
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Abstract
Pressure sensitive adhesive (PSA) polymers, especially low Tg, high tack, nonpolar and polar polymers useful in formulating PSA can be solubilized or dispersed in a supercritical fluid (SCF), such as liquid CO2 or supercritical CO2, using an organic cosolvent such as toluene. PSA polymers can be polymerized in SCF fluids to make unique adhesive products. Inclusion of a fluorinated reactant in the SCF polymerization process yields a PSA with improved resistance to mineral oil.
Claims8
A method for making a pressure sensitive adhesive (PSA), which comprises:
- subjecting one or more of PSA monomer or oligomer reactants to polymerization in a solvent of supercritical, near supercritical, or subcritical fluid, wherein said reactants consist essentially of a C1-C12 alkyl (meth)acrylate.
Dependencies are inferred from the claim text.