Curable pressure sensitive adhesive compositions
Assignee3M Innovative Properties Company
InventorsJie Yang, Stephen A. Johnson, William L. Kausch, Ying-Yuh Lu, Steven J. McMan
Life of this patent
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Abstract
Curable pressure sensitive adhesive compositions comprising an acrylate copolymer, a mono-acrylate oligomer, a multi-acrylate oligomer having from 2 to 5 acrylate functional groups per molecule, and a photoinitiator, the adhesive exhibiting pressure sensitive adhesive characteristics and forms at least a semi-interpenetrating polymer network when cured; wherein the semi-IPN has an average molecular weight between crosslinks (Mc) greater than about 3000, and the cured adhesive has a peel strength greater than about 40 N/dm. Embodiments of the adhesive compositions, when cured, are optically clear and resistant to heat and moisture.
Claims21
An adhesive composition comprising:
- an acrylate copolymer;
- a mono-acrylate oligomer;
- a multi-acrylate oligomer having 2 to 5 acrylate functionalities;
- and
- a photoinitiator that initiates free radical polymerization;
- wherein said mono-acrylate oligomer is present in an amount greater than the amount of said multi-acrylate oligomer, and wherein said mono-acrylate oligomer, multi-acrylate oligomer and photoinitiator, when blended with said acrylate copolymer, forms a pressure sensitive adhesive, and when cured, forms a cured adhesive comprising at least a semi-interpenetrating polymer network having an average molecular weight between crosslinks (Mc) greater than about 3000, said cured adhesive having a peel strength greater than about 40 N/dm.
A curable adhesive composition comprising:
- an acrylate copolymer;
- a mono-acrylate oligomer;
- a multi-acrylate oligomer having 2 to 5 acrylate functionalities;
- an ultra-violet light absorber;
- and
- a photoinitiator that initiates free radical polymerization;
- wherein
- said mono-acrylate oligomer is present in an amount greater than the amount of said multi-acrylate oligomer;
- said mono-acrylate oligomer, multi-acrylate oligomer and photoinitiator, when blended with said acrylate copolymer, forms a pressure sensitive adhesive;
- and
- said blend of oligomers and copolymer, when actinically cured, forms a cured adhesive comprising at least a semi-interpenetrating polymer network with an average molecular weight between crosslinks (Mc) greater than about 3000;
- said cured adhesive exhibiting substantial optical clarity, ultra-violet light absorbing capability, and a peel strength greater than about 40 N/dm.
Dependencies are inferred from the claim text.