Double-Sided Self-Adhesive Products with High Optical Quality
The invention relates to a double-sidedly pressure-sensitively adhesive product having a haze value (measured by test method B) of 5% or less, comprising a carrier having a first surface and a second surface, and also a first layer of pressure-sensitive adhesive, disposed on the first surface of the carrier, and a second layer of pressure-sensitive adhesive, disposed on the second surface of the carrier, characterized in that the carrier has a modulus of elasticity of 2.5-500 MPa.
1 . A process for adhesive bonding of optical components comprising applying a double-sided pressure-sensitive adhesive product to optical components,
wherein the adhesive product comprises,
(i) a carrier having a first surface and a second surface, and
(ii) a first layer of pressure-sensitive adhesive, disposed on the first surface of the carrier, and
(iii) a second layer of pressure-sensitive adhesive, disposed on the second surface of the carrier,
and wherein the carrier has a modulus of elasticity of 2.5-500 MPa, and the adhesive product has a haze value of 5% or less as measured by ASTM D1003.
2 . The process of claim 1 , wherein the carrier has a modulus of elasticity of 5-250 MPa.
3 . The process of claim 1 , wherein the difference in the refractive indices of the first and second layers of pressure-sensitive adhesive in relation to the refractive index of the carrier is in each case less than 0.1.
4 . (canceled)
5 . The process of claim 1 , wherein the optical components have topographical height differences of more than 100 μm.
6 . (canceled)
7 . The process of claim 1 , wherein at least one of the optical components is transparent.
8 . The process of claim 1 , wherein the carrier has a layer thickness of between 100 μm to 1000 μm.
9 . The process of claim 1 , wherein the carrier has a layer thickness of between 250 μm to 500 μm.
10 . The process of claim 1 , wherein the carrier has a layer thickness of between 125 μm to 250 μm.
11 . The process of claim 1 , wherein the carrier is made from a non-thermoplastic elastomer.
12 . The process of claim 1 , wherein the carrier is made from a thermoplastic elastomer selected from the group consisting of semicrystalline polymers, polyolefins, ethylene-vinyl acetate (EVA), ethylene-acrylate (EA), ethylene-methacrylate (EMA), low density polyethylene (PE-LD), linear low density polyethylene (PE-LLD), very low density linear polyethylene (PE-VLD), polypropylene homopolymer (PP-H), impact or random polypropylene copolymer (PP-C), soft polyethylene elastomers, soft polypropylene copolymers, and elastomeric heterophase polyolefin.
13 . The process of claim 1 , wherein the carrier is selected from the group consisting of crosslinked (meth)acrylate copolymer-based elastomers.
14 . The process of claim 1 , wherein the carrier comprises a (meth)acrylate block copolymer.
15 . The process of claim 1 , wherein the carrier comprises a polymethylmethacrylate-polybutylacrylate-polymethylmethacrylate block copolymer.