Adhesive compositions with (meth)acrylic-based block copolymers

Patent metadata

Field	Value
Publication number	US-10640690-B2
Application number	US-201716082416-A
Country	US
Kind code	B2
Filing date	Mar 14, 2017
Priority date	Mar 18, 2016
Publication date	May 5, 2020
Grant date	May 5, 2020

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.

First claim

We claim:

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 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.

2. The adhesive article of claim 1 , wherein the substrate is a backing layer.

3. The adhesive article of claim 1 , further comprising a pharmaceutical agent.

4. The adhesive article of claim 1 , wherein the adhesive article is adhered to skin.

5. The adhesive article of claim 1 , wherein each A block has a glass transition temperature equal to at least 50° C. and wherein the B block has a glass transition temperature no greater than 20° C. when measured using Dynamic Mechanical Analysis.

6. The adhesive article of claim 1 , wherein the adhesive composition further comprises an additive selected from a tackifier, plasticizer, filler, or a combination thereof.

7. The adhesive article of claim 1 , wherein the A blocks of the (meth)acrylic-based triblock copolymer A-B-A and the C block of the (meth)acrylic-based diblock copolymer C-D comprise the same alkyl methacrylate having a glass transition temperature as a homopolymer that is at least 50° C. when measured using Dynamic Mechanical Analysis.

8. The adhesive article of claim 1 , wherein the B block of the (meth)acrylic-based triblock copolymer A-B-A and the D block of the (meth)acrylic-based diblock copolymer comprise the same alkyl acrylate having a glass transition temperature as a homopolymer that is no greater than 20° C. when measured using Dynamic Mechanical Analysis.

9. The adhesive article of claim 1 , wherein the A blocks of the (meth)acrylic-based triblock copolymer A-B-A and the C block of the C-D (meth)acrylic-based diblock copolymer are poly(methyl methacrylate) and wherein the B block of the (meth)acrylic-based triblock copolymer A-B-A and the D block of the C-D (meth)acrylic-based diblock copolymer are both a poly(n-butyl acrylate), poly(isooctyl acrylate), poly(2-octyl acrylate), poly(isobornyl acrylate), or poly(2-ethylhexyl acrylate).

10. The adhesive article of claim 1 , wherein the (meth)acrylic-based triblock copolymer A-B-A has a number average molecular weight (M n ) in a range of 25 to 150 kDaltons and wherein the (meth)acrylic-based diblock copolymer C-D has a number average molecular weight (M n ) in a range of 25 to 100 kDaltons.

11. The adhesive article of claim 1 , wherein the adhesive composition comprises 70 to 100 weight percent of the (meth)acrylic-based composition and 0 to 30 weight percent of an additive selected from a tackifier, plasticizer, filler, or combination thereof.

Assignees

• 3M Innovative Properties Co

Inventors

• Tse Kiu-Yuen
• Determan Michael D

Classifications

• C09J153/00 Primary

  Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers · CPC title

• C09J133/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C08L2203/02

  for biomedical use · CPC title

• C08L53/00

  Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers · CPC title

• C08L2312/06

  by radiation · CPC title