Heat-activated pressure sensitive adhesive for bonding label stock to plastic film, metal foil and the like
AssigneeH. B. Fuller Company
InventorRobert M. Hume, III
Life of this patent
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Abstract
A heat-activated pressure-sensitive adhesive which comprises an aqueous emulsion of finely divided solids comprising a rubber polymer, a resin and a plasticizer, which optionally contains urea, a urea-compound and/or a polyhydroxy compound in the aqueous phase. Substrates such as plastic film, metal foil and cigarette paper may be effectively bonded.
Claims21
An aqueous adhesive composition which when heated to an activating temperature acquires pressure-sensitive properties, which comprises an emulsion having at least an aqueous phase and a solid phase, wherein the solid phase comprises finely divided particles, that are mutually incompatible at room temperature, of a rubbery polymer, at least about 100 parts of a rosin compound, and at least 150 parts of a plasticizer each per 100 parts of the rubbery polymer, and the aqueous phase comprises less than about 50 wt-% of the emulsion.
An aqueous adhesive composition, which when heated to an activating temperature acquires pressure sensitive properties, which comprises an emulsion having at least a solid phase and an aqueous phase, the solid phase comprising finely divided particles of a styrene-butadiene rubber, about 250-750 parts of a glycerol ester of polymerized rosin, about 250-750 parts of dicyclohexylphthalate each per 100 parts of the styrene butadiene rubber and the aqueous phase comprising an aqueous solution containing about 25 to 500 parts of urea and 25 to 500 parts of glycerine each per 100 parts of rubber in the adhesive.
Dependencies are inferred from the claim text.