High Refractive Acrylic Resin For Optical Films

Optical functional films are a type of thin film material with specific optical properties, which are widely used in display devices (such as LCD and OLED screens), lighting systems, optical sensors and other fields. They achieve functions such as brightening, anti-reflection, protection, and viewing angle control by regulating the propagation direction, reflection, refraction, and scattering of light. The following is a detailed introduction to several common optical functional films:

1. Protective Film
Definition and Function
Protective Film is a transparent film used to cover the surface of optical devices or display screens. It mainly plays a physical protection role and may have additional functions such as anti-reflection, anti-glare, and anti-fingerprint.

Structure and Materials

Substrate: Commonly used PET (polyester), TPU (thermoplastic polyurethane) or acrylic materials.

Functional layer: Anti-scratch coating (such as silicone), anti-reflective coating (AR coating) or anti-fouling coating may be added.

Core Function

Physical protection: prevent screen scratches, abrasion or impact damage.

Optical optimization: reduce ambient light reflection (anti-glare) and improve display contrast.

Easy to clean: anti-fingerprint, anti-oil, easy to wipe.

Application scenarios
Mobile phone/tablet screens, car central control screens, industrial equipment touch screens, etc.

2. BEF Brightness Enhancement Film
Definition and Function
BEF was developed by 3M. It is a functional film that achieves directional light enhancement through a micro-prism structure. It is often used with a prismatic film to further enhance display brightness.

Structural Features

Multi-layer design: usually composed of a prism layer (micro-structure surface) and a diffusion layer (substrate).

Micro-structure density: the prism spacing is smaller (such as 20-50μm), which is denser than traditional prism films.

Working Principle

Light Focusing: The micro-prism reflects the large-angle light back to the backlight system and emits it again after recycling.

Total reflection effect: The prism angle design is used to make the light fully reflected in the film and finally concentrated in the normal viewing direction.

Performance Advantages

High gain brightness: A single layer of BEF can increase the brightness by about 60%, and the multi-layer superposition effect is more significant.

Light and thin: The thickness is only 100-200μm, suitable for ultra-thin display devices.

Application areas: High-end LCD TVs, laptops, car displays, etc.

T-6603 resin is a modified acrylic UV resin with high refractive index, strong toughness, low shrinkage, fast curing, high temperature and humidity resistance and hot and cold shock resistance. As the main resin, it is used in optical lens bonding, optical film printing, optical fiber coating and optical module 3D printing molding.

UV ink: T-6603 resin is recommended for optical functional films, laminating protective films, prism BEF brightening films. The coating is colorless and highly transparent, with high hardness and good protective function. Fast curing and extremely low shrinkage. The film does not warp or curl when cured.

UV adhesive: Applicable to optical lens bonding, optical fiber coating, good toughness, and long-lasting stability under double 85 conditions.

Monomer: OPPEA and other high refractive index monomers are recommended for surface coating. The combination of mercapto monomer (Thiol-80) for LED light source surface printing can increase the curing speed. For adhesive applications, VM-3540 VM-3530 vinyl ether and other monomers are recommended to promote adhesion.

Solvent: It is miscible with ester, ketone, or aromatic solvents. It cannot be dissolved in a single alcohol solvent, but is soluble in a mixed solvent containing alcohol and ether.
Polymer: It can be well soluble with polyester, epoxy, polyurethane, phosphate ester, and acrylate to meet the needs of formula preparation.

Packing: 20kg plastic drum, 200kg iron drum

More detailed application references and MSDS are available upon request....

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