Macromer reinforced pressure sensitive skin adhesive sheet material
AssigneeMinnesota Mining and Manufacturing Company
InventorsStephen E. Krampe, Cheryl L. Moore, Charles W. Taylor
Life of this patent
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Abstract
A skin adhesive coated sheet material is provided which is coated with a polymer that exhibits an enhanced level of initial adhesion when applied to skin but resists objectionable adhesion build up over time. The skin adhesives are comprised of a macromer reinforced acrylate copolymer which has a creep compliance value at least about 1.2.times.10.sup.-5 cm.sup.2 /dyne. A stable chemical complex of iodine, iodide and a pressure-sensitive adhesive is also provided wherein the adhesive has a creep compliance value of at least about 1.0.times.10.sup.-5 cm.sup.2 /dyne measured when the adhesive composition is substantially free of iodine.
Claims19
An adhesive sheet material suitable for application to skin, said adhesive sheet material comprising a conformable backing member and a skin adhesive composition which is applied to at least a portion of one surface of said conformable backing member, said skin adhesive composition comprising a copolymer of copolymerized A monomers, C macromers, and optionally B monomers, wherein:
- A is a monomeric acrylate or methacrylate ester of a non-tertiary alcohol, said alcohol having from about 1 to about 14 carbon atoms with the average number of carbon atoms being from about 4 to about 12;
- B, when used, is at least one ethylenically unsaturated compound copolymerizable with said A monomer, with B monomers comprising from about 0% to about 25% of the total weight of A and B monomers;
- and
- C is a macromer having the general formula:
- X-(Y).sub.n -Z
- wherein:
- X is a vinyl group copolymerizable with said A and B monomers, X having the general formula:
- ##STR5## wherein R is a hydrogen atom or COOH group and R' is a hydrogen atom or a methyl group;
- Y is a divalent linking group with n being either 0 or 1;
- and
- Z is a monovalent polymeric moiety having a T.sub.g greater than about 20.degree. C. and a weight average molecular weight in the range of about 2,000 to about 30,000 and being essentially unreactive under copolymerization conditions, Z having the general formula:
- ##STR6## wherein R.sup.2 is a hydrogen atom or a lower alkyl group, R.sup.3 is a lower alkyl group, n is an integer from about 20 to about 500, and R.sup.4 is a monovalent radical selected from the group consisting of:
- ##STR7## and --CO.sub.2 R.sup.6 wherein R.sup.5 is a hydrogen atom or a lower alkyl group and R.sup.6 is a lower alkyl group;
- wherein the number and composition of said C macromers is such that the skin adhesive composition has a creep compliance of at least about 1.2.times.10.sup.-5 cm.sup.2 /dyne when measured after about 3 minutes of subjection to stress.
Dependencies are inferred from the claim text.