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Optically Clear Adhesive Tapes as a Reliable Bonding Solution for Applications
on PMMA and PC

The challenge with OCA tape applications is to avoid the forming of air bubbles between material and tape during and after the application process. In the entire application set-up, air bubbles have a negative impact on the function of touch sensors and printed electronics.

Our optically clear adhesive tape solutions enable secure lamination and mounting in a wide field of printed electronics applications, 

and also in touch sensors in human machine interface (HMI) applications. They are particularly suitable for bonding applications on moisture-outgassing plastics such as PMMA or PC. In addition to their permanently high transparency, the adhesive tapes are acid-free and enable a bubble-free appearance at temperatures of up to 105 °C. They are also excellent for encapsulating the print edges of the most common screen printing inks.

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Bubble-free Bonding on
Moisture Outgassing Plastics

Our OCA solutions enable bubble free bonding after a temperature exposition of up to 105 °C:

Substrate-plastics

 

Substrate

  • Polycarbonate (optional: including corona pre-treatment)
  • Polymethylmethacrylate (optional: including corona pre-treatment)
  • Polyethylene
Lamination

 

Lamination

  • Fully or semi automatic
  • First on flexible, then to rigid substrate
Conditioning

 

Conditioning

  • Autoclave
  • Recommendation: 40-60 °C component temperature, 6 bar, > 20 min

Examples of Application Fields:

Lamination of printed electronics and assembly on plastic components

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Bonding of printed overlay films on HMI devices

OPTICA~3
Optically-clear-adhesive-tape-bubble-free-no-haze
Clearly Recognizable in Direct Comparison:

Lohmann's OCA solutions are ahead of conventional OCA adhesive tapes on the market.

Other optically clear adhesive tapes (as an example the upper sample in the illustration) cast clearly visible bubbles after exposure to temperature. These affect the optical brilliance and function of HMI interfaces. For example, the sensitivity of touch sensors is reduced, or the backlighting of buttons and the visual appearance of displays are less visible. In addition, the effect of temperature can reduce the transparency of the optically clear adhesive tape - in some cases, this can even lead to haze or yellowness of the product.

Lohmann's OCA tape (the lower sample in the illustration), on the other hand, remains bubble-free after exposure to temperature. There is no haze or yellowness of the product.


Conventional OCA tape (upper sample) vs. Lohmann OCA tape
(lower sample) after temperature exposure - direct comparison

Optically-clear-adhesive-tape-structure
Your benefits
  • > 98 % optical transmission
  • Low haze and yellowness index
  • Excellent resistance to moisture outgassing plastic substrates (polycarbonate / polymethylmethacrylate)
  • High durability under sunlight exposure without air bubble forming and yellowing
  • Long term durability at temperature exposure < 105 °C without air bubble forming and yellowing possible
  • Acid free and compatible to conductive inks
  • Good adaptability to print steps
  • Clean room practices converting and packaging possible

Questions, Ideas, or a Need for Consulting?

Then please feel free to contact us! Our OCA experts are here to assist you with all your inquiries.

Whether technical advice, product information, or individual solutions - we are here for you. 

Stephan-Falker-1-1

Stephan Falker

Market Manager
Home Appliances
& Electronics

Download Center: Data Sheets and Usage Instructions

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