Acrylic polymer-based adhesives
Acrylic polymers comprising a non-primary hydroxyl functional monomer and low Tg alkyl acrylate monomers are useful in adhesive compositions that find use in skin contact applications.
1 . An acrylic polymer comprising less than about 50 wt % of a functional monomer component and greater than about 40 wt % of a low Tg alkyl acrylate component, and wherein the polymer comprises greater than about 3 wt % of a secondary hydroxyl functional monomer.
2 . The polymer of claim 1 further comprising a nitrogen containing monomer component and/or a carboxyl functional monomer.
3 . The polymer of claim 2 which comprises hydroxypropyl acrylate and/or hydroxypropyl methacrylate.
4 . The polymer of claim 3 which comprises butyl acrylate, t-octyl acrylamide, hydroxyethyl acrylate and acrylic acid.
5 . The polymer of claim 4 which comprises from about 55 to about 65 wt % of butyl acrylate, from about 5 to about 15 wt % t-octyl acrylamide, from about 20 to about 30 wt % of hydroxypropyl acrylate and from about 5 to about 10 wt % of acrylic acid.
6 . The polymer of claim 5 which comprises about 59 wt % of butyl acrylate, about 9.5 wt % t-octyl acrylamide, about 25.5 wt % of hydroxypropyl acrylate and about 6 wt % of acrylic acid.
7 . A pressure sensitive adhesive composition comprising an acrylic polymer, wherein the acrylic polymer comprises less than about 50 wt % of a functional monomer component and greater than about 40 wt % of a low Tg alkyl acrylate component, and wherein the polymer comprises greater than about 3 wt % of a secondary hydroxyl functional monomer.
8 . The adhesive of claim 7 wherein the acrylic polymer comprises hydroxypropyl acrylate and/or hydroxylpropyl methacrylate.
9 . The adhesive of claim 8 wherein the acrylic polymer also comprises a nitrogen containing monomer and/or a carboxyl functional monomer.
10 . The adhesive of claim 9 wherein the alkyl acrylate monomer component comprises butyl acrylate, 2-ethylhexyl acrylate and/or isooctyl acrylate.
11 . The adhesive of claim 10 which comprises an N-substituted acrylamide
12 . The adhesive of claim 11 wherein the N-substituted acrylamide is t-octyl acrylamide.
13 . The adhesive of claim 12 wherein the acrylic polymer comprises butyl acrylate, t-octyl acrylamide, hydroxypropyl acrylate and acrylic acid.
14 . The adhesive of claim 13 wherein the acrylic polymer comprises from about 55 to about 65 wt % of butyl acrylate, from about 5 to about 15 wt % t-octyl acrylamide, from about 20 to about 30 wt % of hydroxypropyl acrylate and from about 5 to about 10 wt % of acrylic acid.
15 . The adhesive of claim 14 further comprising a plasticizer, a tackifier, a permeation enhancer, a therapeutic agent, or a combination thereof.
16 . An article of manufacture comprising the adhesive of claim 7 .
17 . The article of claim 16 to be adhesively adhered to the skin.
18 . The article of claim 16 which is a tape, a plaster, or a bandage.
19 . The article of claim 16 wherein the adhesive comprises an acrylic polymer comprising butyl acrylate, t-octyl acrylamide, hydroxypropyl acrylate and acrylic acid.
20 . The article of claim 19 wherein the adhesive further comprises a plasticizer, a tackifier, a permeation enhancer, a therapeutic agent, or a combination thereof.