Pressure-sensitive adhesive
AssigneeMinnesota Mining and Manufacturing Company
InventorsPatrick G. Zimmerman, Gaddam N. Babu, Lang N. Nguyen, Ingrid E. Blair, George F. Vesley
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Abstract
Radiation-curable, tackifier-free compositions are provided which contain: (i) a blend of certain acrylate esters and monoethylenically-unsaturated copolymerizable monomers; (ii) certain .alpha.-olefin polymers; and (iii) a photoinitiator and optionally, a crosslinker. Pressure-sensitive adhesives having good adhesion to both low and high energy surfaces as well as possessing excellent low and high temperature performance properties are prepared by exposing the radiation-curable compositions to light having a wavelength in the range of from about 280 to 400 nm.
Claims29
A radiation-curable tackifier-free composition comprising:
- a) 100 parts by weight (pbw) of a blend of:
- i) 60 to 100 pbw acrylic acid esters of monohydric alcohols having an average of 4 to 12 carbon atoms;
- and
- ii) 0 to about 40 pbw monoethylenically-unsaturated copolymerizable monomer whose homopolymer has a T.sub.g greater than about 50.degree. C.;
- b) 10 to 100 pbw of polymer of alpha-olefins having a T.sub.g in the range of about -70.degree. C. to -10.degree. C. and having a weight average molecular weight of about 25,000 to about 5,000,000 wherein at least 60 mole percent of the alpha-olefins have 6 to 18 carbon atoms;
- and
- c) photochemically effective amount of a material selected from the group consisting of:
- (i) photoinitiator, (ii) photoinitiator and a polyfunctional acrylate crosslinker;
- and (iii) a photoinitiator that is also a photocrosslinker.
Dependencies are inferred from the claim text.