Adhesive composition and methods of forming the same

A method of forming an adhesive composition, wherein the method comprises

• providing a pre-adhesive mixture comprising:
• a pre-adhesive (meth)acrylic based polymeric component A, wherein the pre-adhesive (meth)acrylic based polymeric component A is fully polymerized;
• a pre-adhesive (meth)acrylic based polymeric component B at a content of at least about 73 wt. % for a total weight of the pre-adhesive mixture, wherein the pre-adhesive (meth)acrylic based polymeric component B is unpolymerized;
• and
• a pre-adhesive tackifier component;
• mixing the pre-adhesive mixture;
• and
• polymerizing the pre-adhesive mixture to form the adhesive composition,
• wherein the (meth)acrylic based polymeric component A has a weight average molecular weight of at least about 30,000 g/mol and not greater than about 200,000 g/mol,
• wherein the (meth)acrylic based polymeric component B has a weight average molecular weight of at least about 100,000 g/mol, and
• wherein an overall level of acidic monomers in the adhesive composition is not greater than about 0% by weight of the adhesive composition, wherein the pre-adhesive mixture comprises:
• at least about 2 wt. % and not greater than 47 wt. % of a pre-adhesive (meth)acrylic based polymeric component A for a total weight of the pre-adhesive mixture;
• and
• at least about 0.1 wt. % and not greater than about 30 wt. % of a tackifier component for a total weight of the pre-adhesive mixture,
• wherein the pre-adhesive (meth)acrylic based polymeric component A comprises a reaction product of polymerizable material comprising:
• at least about 40 wt. % and not greater than about 99 wt. % of a pre-adhesive monomer component a1 for a total weight of the pre-adhesive (meth)acrylic based polymeric component A, wherein the pre-adhesive monomer component a1 is an ethylenically unsaturated monomer, and
• at least about 0.1 wt. % and not greater than about 20 wt. % of a pre-adhesive monomer component a2 for a totally weight of the pre-adhesive (meth)acrylic based polymeric component A,
• wherein the pre-adhesive (meth)acrylic based polymeric component B is acid-free and comprises a reaction product of polymerizable material comprising:
• at least about 40 wt. % and not greater than about 99 wt. % of a pre-adhesive monomer component b1 for a total weight of the pre-adhesive (meth)acrylic based polymeric component B, wherein the pre-adhesive monomer component b1 is a C1-C24 acrylic ester, and
• at least about 1 wt. % and not greater than about 60 wt. % of a pre-adhesive monomer component b2 for a totally weight of the pre-adhesive (meth)acrylic based polymeric component B, wherein the pre-adhesive monomer component b2 is an ethylenically unsaturated functional monomer selected from the group consisting of hydroxyl containing (meth)acrylic monomer and a nitrogen-containing monomer having a primary, secondary or tertiary amino group or an N,N-dialkylaminoalkyl (meth)acrylate, and
• wherein the tackifier component comprises C5, C9, C5/C9, dicyclopentadiene, or their hydrogenated resins, or combinations thereof, and
• wherein the monomer component a2 is N-hydroxyalkyl (meth) acrylamide.