Process for binding substrates with a liquid optically clear photo-curable adhesive
AssigneesHenkel AG & Co. KGaA, Henkel IP & Holding GmbH
InventorsDaoqiang Lu, Masao Kanari, Junichi Sawanobori
Life of this patent
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Abstract
A process for binding a top substrate to a base substrate is disclosed, in which (a) a liquid optically clear photo-curable adhesive is applied onto the top side of the base substrate, (b) the liquid optically clear photo-curable adhesive is partially cured by exposure to electromagnetic radiation comprising a wavelength ranging from 200 nm to 700 nm, (c) the top substrate is attached on the partially cured adhesive layer of step (b), (d) the adhesive is fully cured by exposure to electromagnetic radiation comprising a wavelength ranging from 200 nm to 700 nm.
Claims20
A liquid optically clear photo-curable adhesive, which consists of:
- (a) 5 to 50 wt % of an aliphatic polyether urethane acrylate having a glass transition temperature in a range of from −80 to −10° C. and a viscosity in a range of from 5,000 to 500,000 mPa at 25° C. at a shear rate of 2.55 sec−1,
- (b) 10 to 80 wt % of a plasticizer selected from the group consisting of polyisoprene resin and polybutadiene resin,
- (c) 0.02 to 5 wt % of a photo initiator selected from the group consisting of 2,2-dimethoxy-1,2-diphenylethan-1-one, trimethylbenzoyl diphenylphosphine oxide, 1-hydroxycyclohexyl benzophenone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one, and combinations thereof;
- (d) 0.1 to 10 wt % of a functional group containing (meth)acrylate monomer, wherein the functional group on the (meth)acrylate monomer is hydroxyl, amide, carboxyl, or a combination thereof, and
- (e) 0.1 to 45 wt % of a (meth)acrylate monomer and/or oligomer, the oligomer having a glass transition temperature in a range of from −80 to 100° C. and a weight average molecular weight in a range from 1,000 to 15,000.
A liquid optically clear photo-curable adhesive, which consists of:
- (a) 10 to 30 wt % of an aliphatic polyether urethane acrylate having a glass transition temperature in a range of from −80 to −10° C. and a viscosity in a range of from 5,000 to 500,000 mPa at 25° C. at a shear rate of 2.55 sec−1;
- (b) 30 to 70 wt % of a plasticizer;
- (c) 0.5 to 1.5 wt % of a photo initiator;
- (d) 0.1 to 10 wt % of a functional group-containing (meth)acrylate monomer;
- and
- (e) 5 to 40 wt % of a (meth)acrylate monomer and/or oligomer, the oligomer having a glass transition temperature in a range of from −80 to 100° C. and a weight average molecular weight in a range from 1,000 to 15,000.
Dependencies are inferred from the claim text.