Adhesive compositions with (meth)acrylic-based block copolymers
First Claim
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1. An adhesive article comprising:
- a substrate; and
an adhesive composition layer having a first major surface attached to the substrate, wherein the adhesive composition layer comprises a crosslinked polymeric product of a reaction mixture comprisinga) a (meth)acrylic-based composition comprising1) 0 to less than 10 weight percent of a (meth)acrylic-based triblock copolymer A-B-A based on a total weight of the (meth)acrylic-based composition, whereineach A block is a polymerized product of a first monomer composition comprising an alkyl methacrylate;
the B block is a polymerized product of a second monomer composition comprising an alkyl acrylate;
the (meth)acrylic-based triblock copolymer A-B-A having 20 to 55 weight percent A blocks and 45 to 80 weight percent B block based on a total weight of the (meth)acrylic-based triblock copolymer A-B-A; and
2) greater than 90 to 100 weight percent of a (meth)acrylic-based diblock copolymer C-D based on the total weight of the (meth)acrylic-based composition, whereinthe C block is a polymerized product of a third monomer composition comprising an alkyl methacrylate;
the D block is a polymerized product of a fourth monomer composition comprising an alkyl acrylate; and
the (meth)acrylic-based diblock copolymer C-D having 5 to 30 weight percent C block and 70 to 95 weight percent D block based on a total weight of the (meth)acrylic-based diblock copolymer C-D; and
b) electron beam radiation and/or gamma ray radiation, wherein the reaction mixture is free of a chemical crosslinking agent; and
an absorbent material positioned adjacent to but not covering an outer edge of a second major surface of the adhesive composition layer opposite the substrate.
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Abstract
Adhesive compositions are provided that contain a crosslink product resulting from exposure of a (meth)acrylic-based composition to electron beam radiation, gamma ray radiation, or both. More particularly, the (meth)acrylic-based composition includes a (meth)acrylic-based diblock copolymer and an optional (meth)acrylic-based triblock copolymer. These adhesive compositions are particularly well suited for application to biological surface such as skin.
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11 Claims
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1. An adhesive article comprising:
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a substrate; and an adhesive composition layer having a first major surface attached to the substrate, wherein the adhesive composition layer comprises a crosslinked polymeric product of a reaction mixture comprising a) a (meth)acrylic-based composition comprising 1) 0 to less than 10 weight percent of a (meth)acrylic-based triblock copolymer A-B-A based on a total weight of the (meth)acrylic-based composition, wherein each A block is a polymerized product of a first monomer composition comprising an alkyl methacrylate; the B block is a polymerized product of a second monomer composition comprising an alkyl acrylate; the (meth)acrylic-based triblock copolymer A-B-A having 20 to 55 weight percent A blocks and 45 to 80 weight percent B block based on a total weight of the (meth)acrylic-based triblock copolymer A-B-A; and 2) greater than 90 to 100 weight percent of a (meth)acrylic-based diblock copolymer C-D based on the total weight of the (meth)acrylic-based composition, wherein the C block is a polymerized product of a third monomer composition comprising an alkyl methacrylate; the D block is a polymerized product of a fourth monomer composition comprising an alkyl acrylate; and the (meth)acrylic-based diblock copolymer C-D having 5 to 30 weight percent C block and 70 to 95 weight percent D block based on a total weight of the (meth)acrylic-based diblock copolymer C-D; and b) electron beam radiation and/or gamma ray radiation, wherein the reaction mixture is free of a chemical crosslinking agent; and an absorbent material positioned adjacent to but not covering an outer edge of a second major surface of the adhesive composition layer opposite the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification