UNIFINER

UNIFINER has been developed by changing the structure as a new polyarylate resin that is transparent and more highly heat-resistant, easily and stably soluble in solvents.

Main Features of UNIFINER

1. High heat resistance

Tg of up to 275°C (M-2000H)

2. Solvent Solubility

Dissolution in general purpose solvents such as cyclohexanone and toluene

3. Transparency

Excellent optical property

The others

1. Chemical structual formula

Polyarylate resin is a general term of thermoplastic aromatic polyester that consists of polycondensate of dihydric phenol and dibasic acid.

A representative polyarylate resin is U-polymer [U-100]; a transparent, highly heat-resistant, amorphous thermoplastic super engineering plastic. UNITIKA industrialized earlier than any other company in the world. [U-100] has the following chemical structure:

UNIFINER has been developed by changing the structure as a new polyarylate resin that is transparent and more highly heat-resistant, easily and stably soluble in solvents.

2. Mechanical characteristic

UNIFINER has excellent mechanical strength (toughness) that the conventional transparent resin does not have.
The surface hardness is high and equivalent to the HB class of the pencil hardness.

3. Weathering durability

Polyarylate resin has great ultraviolet absorption capacity and high weathering durability. Polyarylate resin has such characteristics, because it absorbs ultraviolet energy and causes Fries rearrangement reaction, producing a benzophenone structure on the resin surface. (Refer to the figure below.) This allows polyarylate resin to block light of 400 nm or less. The Fries rearrangement reaction changes the tone of color (yellowing), hardly affecting the transparency.

4. Electrical properties

The dielectric breakdown strength is higher than any other kind of thermoplastic resin.
The volume resistivity is high, indicating insulation properties.
The insulation properties do not diminish even at high temperatures and after heat aging, ensuring stable electrical properties.
The dielectric constant (ε) and dielectric loss tangent (tanδ) are stable in wide temperature and frequency ranges.

5. Chemical resistance

Polyarylate resin is amorphous, having ester bonds in the backbone; therefore, there is a limit to the resistance to alkalis, aromatic hydrocarbons, halogenated hydrocarbons, ketones, and heated water (steam). Caution should be exercised. Furthermore, attention should be paid to the resistance to solvents in the case of the types with increased solvent-solubility.