Nontacky acrylonitrile/butadiene adhesive tape
AssigneeMinnesota Mining and Manufacturing Company
InventorsRobert C. Brown, Shih-Lai Lu
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Abstract
Adhesive tape, the adhesive layer of which comprises a copolymer of (a) acrylonitrile and (b) butadiene and/or isoprene. Even though such an adhesive copolymer layer is usually substantially nontacky, it forms under moderate pressure bonds to many substrates which become stronger than the substrates. The bonds become strong more quickly when heated while the pressure is being applied. For a usefully long period of time after initiating a bond, the tape usually is repositionable.
Claims21
Adhesive tape comprising a backing and an essentially tack-free adhesive layer at least about 0.013 mm thick that consists essentially of an uncrosslinked, tackifier-free copolymer of (a) 10 to 50 weight percent of acrylonitrile and (b) 50 to 90 weight percent of at lest one of butadiene and isoprene, said copolymer having a Mooney viscosity of from about 45 to 95, and said adhesive copolymer layer having a water contact angle of at least 20.degree., said tape initially repositionably bonding at room temperature directly to substrates of polyvinyl chloride, polycarbonate, polystyrene, corona-treated polyester, acrylate, vinyl chloride-vinyl acetate copolymer, or shellac, the strength of the bond increasing in a short time after application to the extent that repositionability is no longer possible.
Dependencies are inferred from the claim text.