Using our background in display enhancement and with the help of other display bonding partners, we employ a wet bonding system that cures to a gel, to deliver a cost effective, scalable system in which the components are processed at ambient temperature without the use of vacuum, temperature, pressure and need for multiple tooling.

Our LOCA bond cures within the wave length range of 390-500nm and can therefore cure through a polarizer and materials containing UV inhibitors. The system can also cure behind edge masks up to a width of ≥20mm (3/4″).

process

Environmental performance

Temperature Stable under multiple ESS cycles between -550C to +950C with ramp rates of 3-50C/min and dwell times at extremes of 30 minutes (minimum)
Humidity No change after exposure to 95% R.H. at 700C for a minimum of 50 hours
UV/solar exposure Fill adhesive and sealing gasket are stable and show minimal changes in transmission and l.a.b. values following extensive simulated UV/solar exposure. Testing to MIL-STD-810G Method 505.5 Procedure II for quantification is ongoing in our certified solar chamber.
Chemical Resistance Stable when in contact with most silicone, polyurethane and polysulphide adhesive sealants. The LOCA bond will be attacked when in contact with adhesive sealants with solvent systems including MEK, acetone, toluene or similar materials.

 

Mechanical performance

Impact resistance. Enhances laminate performance to exceed the boot impact MIL-STD – 3122 and the Wrench Impact Ball drop test (1″ diameter steel ball dropped from 20-25″ – 6 impacts)
Shock absorption LOCA bond laminates of un-tempered float glass absorb 8+ times the energy of a standard dry film laminate before failure
Vibration tolerance In accordance with MIL-STD-810F-514.5
Adhesion – Sheer No failure of a bond to a 10.4″ display with a 1000gm weight suspended vertically at 850C for 8 hours and >1000 hours at ambient
Bond thickness Minimum 0.7 +/-0.1mm measured from the surface of the display bezel to the rear surface of the display enhancement stack

Typical 0.7 +0.3/-0.1mm bond thickness between the display surface depending on the LCD bezel

 

Material properties

Material type Low viscosity, UV-visible curing proprietary Alkyl Urethane
Optical Photopic transmission (Pt) ; >98.5% (typical 99.0%)

# measured between 2 layers of anti-reflective glass Specular Reflectance @ 300 (Sr); <0.05%

Diffuse Reflectance @ 300 (Dr); <0.05%

Refractive Index; 1.51 ±0.02

Cure range 390-500nm
Cure time < 3 minutes with exposure to 3-5milliwatts/sq cm at ambient temperatures
Viscosity (uncured) <50 cps (Allows LOCA bond to be pumped into a fill cavity high rates with low pressure)
Material uniformity A chemical fingerprint of each batch is obtained using FTIR spectrophotometer. All batches must fall within the specified finger print with a tolerance of +/-2%
Hardness / Softness <15 Durometer scale A)
Elasticity Young’s modulus <180KPa
Shrinkage < 5 % by volume
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