Dry apply adhesive graphic films

Abstract

An adhesive composition includes a blend of a pressure sensitive adhesive and an additive. The pressure sensitive adhesive includes a (meth)acrylate polymer. The additive includes a copolymer with a vinyl polymeric backbone that includes at least one free radically polymerizable vinyl monomer A and at least one reinforcing comonomer B, wherein B is present at 0 to about 20% by weight of the copolymer, and a pendant polysiloxane monomer grafted to the backbone. The adhesive composition may optionally be crosslinked. The adhesive composition may be applied to a film to form a graphic article. These graphic articles may be applied to a substrate without liquid application aids.

1 . An adhesive composition comprising a blend of:
 a pressure sensitive adhesive comprising a (meth)acrylate polymer; and,   an additive comprising a copolymer, wherein the copolymer comprises:
 a vinyl polymeric backbone comprising a at least one free radically polymerizable vinyl monomer A and at least one reinforcing comonomer B, 
 wherein B is present at 0 to about 20% by weight of the copolymer, and a pendant polysiloxane monomer grafted to the backbone, wherein the polysiloxane monomer is present at 0.01 to 50% by weight of the copolymer, and wherein the polysiloxane monomer has a number average molecular weight of 500 to 50,000; and 
   wherein the blend comprises less than 1% by weight of the polysiloxane monomer.   
     
     
         2 . The composition of  claim 1 , wherein the blend comprises less than or equal to 0.9% by weight of the polysiloxane monomer. 
     
     
         3 . The composition of  claim 1 , wherein the blend comprises less than or equal to 0.5% by weight of the polysiloxane monomer. 
     
     
         4 . The composition of  claim 1 , wherein the blend comprises less than or equal to 0.1% by weight of the polysiloxane monomer. 
     
     
         5 . The composition of  claim 1 , wherein the pressure sensitive adhesive is a copolymer comprising (meth)acrylate and (meth)acrylic acid monomers. 
     
     
         6 . The composition of  claim 5 , wherein the (meth)acrylate monomer is 2 MBA and the (meth)acrylic acid monomer is acrylic acid. 
     
     
         7 . The composition of  claim 6 , wherein the pressure sensitive adhesive comprises 90 parts by weight of 2 MBA and 10 parts by weight acrylic acid. 
     
     
         8 . The composition of  claim 1 , wherein A is selected from the group consisting of iso-octyl (meth)acrylate; ethyl (meth)acrylate, 2-ethylhexyl (meth)acrylate and isodecyl (meth)acrylate, and B is selected from the group consisting of (meth)acrylic acid, n-vinyl-2-pyrrolidone, acrylamide, and polystyrene. 
     
     
         9 . The composition of  claim 8 , wherein the copolymer comprises 83 parts by weight of iso-octyl (meth)acrylate, 7 parts by weight of acrylic acid and 10 parts by weight of the polysiloxane monomer. 
     
     
         10 . The composition of  claim 1 , further comprising a crosslinker. 
     
     
         11 . An adhesive composition comprising a blend of:
 a pressure sensitive adhesive comprising a (meth)acrylate polymer; and,   an additive comprising a copolymer, wherein the copolymer comprises:
 a vinyl polymeric backbone comprising a at least one free radically polymerizable vinyl monomer A and at least one reinforcing comonomer B, wherein B is present at 0 to about 20% by weight of the copolymer, and 
 a pendant polysiloxane monomer grafted to the backbone, wherein the polysiloxane monomer is present at 0.01 to 50% by weight of the copolymer, and wherein the polysiloxane monomer has a number average molecular weight of 500 to 50,000; and 
   a crosslinker.   
     
     
         12 . The composition of  claim 11 , wherein the pressure sensitive adhesive is a copolymer comprising (meth)acrylate and (meth)acrylic acid monomers. 
     
     
         13 . The composition of  claim 12 , wherein the (meth)acrylate monomer is 2 MBA and the (meth)acrylic acid monomer is acrylic acid. 
     
     
         14 . The composition of  claim 11 , wherein the pressure sensitive adhesive comprises 90 parts by weight of 2 MBA and 10 parts by weight acrylic acid. 
     
     
         15 . The composition of  claim 11 , wherein A is selected from the group consisting of iso-octyl (meth)acrylate; ethyl (meth)acrylate, 2-ethylhexyl (meth)acrylate and isodecyl (meth)acrylate, and B is selected from the group consisting of (meth)acrylic acid, n-vinyl-2-pyrrolidone, acrylamide, and polystyrene. 
     
     
         16 . The composition of  claim 11 , wherein the copolymer comprises 83 parts by weight of iso-octyl (meth)acrylate, 7 parts by weight of acrylic acid and 10 parts by weight of the polysiloxane monomer. 
     
     
         17 . The composition of  claim 11 , wherein the crosslinker comprises less than 1% by weight of the composition. 
     
     
         18 . The composition of  claim 11 , wherein the crosslinker comprises an aziridine crosslinker.