US 8,263,720 B1Granted

Sacrificial adhesive coatings

AssigneeRochal Industries, LLP

InventorsJoseph Salamone, Ann Beal Salamone, Xiang Yu, Levi J. Irwin

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Abstract

Combinations of solubilized, covalently crosslinked, siloxy-containing polymers in a solvent system of a volatile hydrophobic (non-polar) liquid that is non-stinging to a user are excellent non-irritating liquid coating materials for forming films, which, after solvent evaporation, are water insoluble but water-vapor permeable and lightly adherent to surfaces such as skin and mucous membranes. The crosslinking content is greater than 1 weight % and can be as much as 16 weight %. In comparison to non-crosslinked polysiloxy films, or crosslinked films of 1 weight % or less, the enhanced crosslinked polysiloxy films, while continuing to be soluble in the solvent, have reduced tack and reduced adhesion to skin and can act as sacrificial coatings under strongly adherent pressure sensitive adhesives.

Claims26

Dependent claims

A liquid, polymer-containing coating material comprising:

about 1 to 50 weight % crosslinked siloxy-containing polymer, comprising:
34 to 99 monomer-weight-% of at least one polymerizable siloxy-containing monomer component, and
greater than 1 to 16 monomer-weight-% siloxy-containing crosslinking agent, wherein said monomer-weight-% is based upon total weight of the crosslinked siloxy-containing polymer;
and
about 50 to 99 weight % of a non-stinging, volatile, hydrophobic liquid as part of a solvent system, said crosslinked siloxy-containing polymer being solubilized in said solvent system;
wherein weight percentages are based on the total weight of the liquid, crosslinked polymer-containing coating material;
and wherein said non-stinging, volatile, hydrophobic liquid is selected from the group consisting of volatile linear and cyclic siloxanes, volatile alkanes, volatile fluorocarbons and chlorofluorocarbons, liquid carbon dioxide under pressure, and combinations thereof, wherein said siloxy-containing crosslinking agent comprises a di-, tri- or multifunctional vinyl polymerizable siloxane or siloxysilane.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/253,348Filed 5 Oct 2011
Granted: 11 Sep 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

A61L 26/0019
Containing macromolecular materials: obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
C09D 183/00
Coating compositions based on macromolecular compounds obtained by reactions forming in the
C09J 143/04
Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one…: homopolymers…
C08F 230/08
Containing a metal: containing silicon