• Global Site
  • About DIC
  • Business
  • IR
  • Sustainability
  • R&D

WORLDWIDE

DICTAT HC-F Series Anti-scattering Adhesive Film

Optical high performance adhesive products usage image
Optical high performance adhesive products usage image

In mobile devices represented by smartphones, models are becoming common that contain touchscreens that can be directly operated. Tempered glass panels are used in these displays because the demands of design, transparency, quality, texture, and thinness.
By applying DIC's glass anti-scattering adhesive film to the glass panel surface, you can add safety by preventing the glass from breaking or scattering even when dropped.

Features

  • By precisely coating the surface of a polyester film with a newly developed specialized high hardness hard coat material, DIC has achieved a surface pencil hardness of over 2H (including adhesive layer), the industry's highest level of surface hardness.
  • Fingerprints adhered to the hard coat surface can be easily and cleanly wiped off by DIC's unique surface modification techniques.

Development Background

To improve operability in small electronic devices like cellular phones and portable audio players, screens keep getting larger and touchscreens are being added. To compensate for a decrease in stiffness created by making devices thinner, screen panel materials are shifting to tempered glass with high stiffness. To prevent scattering when that glass breaks by dropping the device, the surface is treated in a manner such as the application of an adhesive film. However, these kinds of films have issues where they get damaged easily and attract fingerprints.
Therefore, DIC has achieved the industry's highest level of surface hardness by a unique specialized high hardness hard coating and surface modification techniques to develop a glass anti-scattering film that excels in fingerprint wipe off performance.

Design Concept

Required performance

Conventional acrylic resin and polycarbonate resin screen panels have been used on small electronic devices like cellular phones. However, because resin panels lack stiffness, they had problems such as display malfunctions occurring when the panel changed shape by being pressed by a finger and they were deficient in long term reliability.
Recently, tempered glass panels have come to be used instead of resin panels, but now these glass products possess the danger of breaking. Therefore, as a safety measure when the glass in a panel display breaks, protective adhesive films outfitted with an anti-scattering function are being applied to panels.
Normal protective films are PET films treated with a hard coat, but since their thickness is 200 μm or thicker, they have difficulty helping make devices thinner.

DIC's solution

DIC first used a polyester film 100 μm or thinner for the film backing and selected perfectly balanced materials that are easy to apply with little film curling by optimizing the hard coat and adhesive layers.
The hard coat layer is a newly developed low-shrinkage special high hardness hard coat material containing alkyl fluoride. After this hard coat material is coated on the film, it is cured by a UV or other energy beam to achieve the industry's highest level of surface hardness in a thin hard coat film.
By combining this with an adhesive layer that can maintain sufficient adhesive properties even when thin, the film disperses stress applied to it to prevent the glass from breaking, while at the same time is has an anti-scattering effect when the glass breaks, and it can also yield scratch resistance which had been difficult to achieve in past adhesive films.
The ability to easily wipe off fingerprints is also demanded in panels because the touchscreen is directly touched with the fingers. To accommodate this, DIC was successful in adding superior fingerprint wipe off performance to the hard coat surface by our unique surface modification techniques.

Construction

HC-F Construction

The DICTAT HC-F Series is a hard coat PET adhesive film constructed of a high hardness hard coat layer and adhesive layer on a PET film. This product sold with a protective film applied to the hard coat surface.

Performance Tests

Anti-scattering performance test

Anti-scattering performance test

The anti-scattering performance test evaluates the height where the tempered glass breaks by dropping a stainless steel ball on the glass plate. Tempered glass by itself breaks and scatters at a height of 30 cm. On the other hand, when DICTAT HC2120F-BP is applied to the glass surface, the glass breaks at a height of 50 cm, becoming more difficult to break, and when it does break, the film prevents the glass from scattering.

  Tempered Glass
HC2120F-BP Applied
Tempered Glass
Only
Appearance Tempered Glass HC2120F-BP Applied Tempered Glass Only
Height at glass breaks 50 cm 30 cm
Anti-scattering ability Good, no scattering Glass scattered

Fingerprint wipe off test

The fingerprint wipe off test is a method to evaluate the ease of which fingerprints adhered to the product's hard coat surface are wiped off. For DIC's DICTAT HC-F Series, fingerprints can be almost completely wiped off by wiping them with a tissue 5 times.

HC1100F-BP & HC2120F-BP

HC1100F-BP & HC2120F-BP

Typical hard coat film

Typical hard coat film

Physical Properties Table

The DICTAT HC-F Series excels in adhesive strength and optical performance, and in pencil hardness, the reference mark for hard coat hardness, it satisfies the industry's highest level with 2-3H with attached adhesive.

Product Name Thickness
μm
Peel Strength to Glass
N/25 mm
Total Light Transmittance
%
Haze
%
Pencil Hardness Fingerprint
Wipe Off Performance
HC1100F-BP 92 6 91 0.5 2H Good
HC2120F-BP 120 6 91 0.5 2 to 3H Good
For inquires related to these products
For inquires via the web Contact Form

Asia Pacific | HOME > DIC Products > Industrial Adhesive Tapes > Adhesive Tape for IT Devices > DICTAT HC-F Series Anti-scattering Adhesive Film