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.
Claims9
A pressure sensitive adhesive (PSA) composition consisting essentially of a (meth)acrylic PSA polymer, a solvent of supercritical, near supercritical, or subcritical fluid, and an organic cosolvent, wherein the (meth)acrylic PSA polymer is dispersed in the solvent and the cosolvent.
A pressure sensitive (PSA) composition of improved mineral oil resistance, consisting essentially of a PSA polymer, a solvent of supercritical, near supercritical, or subcritical fluid, and an organic cosolvent, wherein the PSA polymer is made from one or more of PSA monomer or oligomer reactants which are subjected to polymerization in a solvent of supercritical, near supercritical, or subcritical fluid, wherein said reactant includes fluorinated monomer or oligomer reactant.
Dependencies are inferred from the claim text.