ADHESIVE ACRYLATE-OLEFIN COPOLYMERS, METHODS FOR PRODUCING SAME AND COMPOSITIONS UTILIZING SAME

摘要

The present invention relates to an adhesive compositions, facestocks and/or packaging labels containing same, where such compositions, facestocks and/or labels are designed to facilitate the recyclability of a plastic article formed from any suitable polymer or mixture of polymers (e.g., a polyethylene terephthalate (PET), high density polyethylene (HDPE), polyvinyl chloride (PVC), low density polyethylene (LDPE), polypropylene (PP), polystyrene (PS), or others of all plastic types), or even glass bottles. In another embodiment, the present invention relates to a method for removing an adhesive composition, facestock and/or packaging label containing same, from a plastic article that is to be recycled.

主权项

1. A facestock/adhesive construction for a plastic, glass, cardboard, or metal article comprising:
a face layer, wherein the face layer is formed from a facestock material selected from paper facestocks, olefin polymer facestocks, polystyrene facestocks, or PET facestocks; and an adhesive layer, wherein the facestock is able to be removed from a plastic, glass, cardboard, or metal article in a manner that enables recycling of the plastic, glass, cardboard, or metal article; and wherein the adhesive layer comprises an adhesive selected from the group consisting of: (i) an acrylic emulsion pressure-sensitive copolymer latex comprising butyl acrylate, 2-ethylhexyl acrylate, and an unsaturated carboxylic acid that is stabilized via nonylphenol polyethylene glycol and partially hydrolyzed polyvinyl alcohol, having a mean particle size greater than about 1 micron and a particle size range of about 0.5 microns to about 3.0 microns, having a glass transition temperature value of about −48° C. to about −55° C.; (ii) a homogeneous dispersion comprising an anionic/non-ionic emulsion pressure-sensitive copolymer latex of 2-ethylhexyl acrylate and other alkyl acrylates and styrene with at least one unsaturated carboxylic acid, including tackifiers comprising a mixture of hydrogenated rosin and tall oil esters; (iii) a polymer produced by copolymerizing a mixture of monomers comprising at least one monomer selected from alkyl acrylate esters containing from about 4 to about 12 carbon atoms in the alkyl group with such one or more alkyl acrylates present in a total amount from about 90 weight percent to about 98 weight percent with up to about 5 weight percent of an unsaturated polar acrylate monomer that contains from 3 to 5 carbon atoms; and (iv) a polymer produced by copolymerizing a mixture of monomers comprising at least one monomer selected from the group of alkyl acrylate esters containing from about 4 to about 12 carbon atoms in the alkyl group where the one or more alkyl acrylate esters are present in a total amount from about 65 weight percent to about 80 weight percent, vinyl acetate present in a total amount of from about 15 to about 35 percent by weight, and up to about 5 weight percent of an unsaturated carboxylic acid contains from 3 to 5 carbon atoms.