Polycarbonate-CompatibleAdhesive Film

GUNZE Limited Electronic Components Division

UV cutting

Outgas-resistant

Bending durability

Acid-free

Thickness

Total light transmittance

Haze

Adhesive strength*With glass, units: N/25 mm

Adhesivefunction

100μm

90.1 %

0.6 %

8.4（12.7）

175μm

90.5 %

0.6 %

9.3（13.2）

Outgas-resistant OCA Measurement method

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●

-

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-

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-

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CSA117 CSA128

JIS K7361-1*

JIS K7136*

Conforms to JIS Z0237

Model no.

Outgas-resistant OCA (adhesive film for polycarbonate)

Ordinary OCA (Optical Clear Adhesive) film is designed assuming it will be bonded to PET film or glass. Therefore, it is not suitable for bonding with resin sheets such as polycarbonate or acrylic. Outgas-resistant OCA developed by Gunze can be used to bond with a variety of materials including not only PET films and glass, but also acrylic and polycarbonate.

Adhesive films used in display components have a direct effect on display performance, and thus require characteristics like optically uniform transparency, and no occurrence of peeling or bubbles. Gunze is working to solve these problems and enhance the function of adhesive film, and as an example of multi-function OCA, we offer adhesive film with outstanding outgas-resistant functionality (compatible with polycarbonate).

*The above are measured values, not guaranteed values.

*Figures in parentheses are numeric values for bonding with polycarbonate

*Measurement composition: Film / Adhesive layer / Glass

【Basic composition】

OCA

Glass

Polycarbonate filmAcrylic film

Plastic substrates such as acrylic and polycarbonate have high water absorbency, and moisture contained in the substrate may turn into gas due to changes over time, or changes in the environment. This is called "outgas." For this reason, a special-purpose OCA must be selected when bonding plastic substrates with a high level of outgas. Gunze's outgas-resistant OCA suppresses bubbles and peeling attributable to outgas.

Outgas-resistant OCA has been provided with an ultraviolet (UV) cutting function, a combination of features previously believed to be difficult to achieve. The film protects the underlayer from ultraviolet degradation, and is also outstanding for improving light-fastness.

In terms of applications, OCA is primarily used for bonding the electrode film used in touch panels. This electrode film is composed of a metal film called ITO, and metal wire made of material like silver. Metal corrosion is prevented by making the primary materials of OCA acid free. Gunze OCA is designed to provide acid-free function, while also maintaining adhesive strength.

No bubbles! UV cutting function! Acid free!

Outgas-resistant

OCA Conventional

OCA

Testcomposition

Conditon photo Condition photoPolycarbonateOutgas-resistant OCA

Glass

No air bubbles or peeling Air bubbles and peeling occer

Condition:85℃／90%R.H.×500hr

PolycarbonateConventional OCA

Glass

1 2 3

1009080706050403020100340 350 360 370 380 390 400 410 420

Tran

smitt

ance

(%)

Wavelength(nm)

Spectral transmittance

General adhesive

Outgas-resistant OCA

Developed product