Covering, coating materials

(1) Composition of UBE Polyimide

"UPIA®" is a polyimide precursor formed from UBE's proprietary "BPDA(Biphenyl tetracarboxylic dianhydride)" monomers. This is the original UBE varnish.

UBE polyimide film "UPILEX®" is produced using this unique UBE polyimide precursor giving it various and unique advantages. Polyimide coated film derived from the varnish of the same graded has the same properties.

Details of [UPILEX®] is Here.

(2) General properties of "UPIA®"

(3) Temperature dependence of solution viscosity

(4) Concentration dependence of solution viscosity

"UPIA®" can be used at any desired concentration by diluting it with anhydrous NMP or DMAc (N, N-dimethylacetamide).

(5) Storage stability

"UPIA®" has superior storage stability compared to conventional polyimide varnishes. It exhibits a very low increase in viscosity at room temperature, while conventional polyimide varnish must be refrigerated or frozen.

Other handling precautions are Here

Heat-resistant varnish UPIA-AT (U-Varnish-A) / High heat-resistant varnish UPIA-ST (U-Varnish-S)

UPIA-AT, UPIA-ST is the same as the U-Varnish-A, U-Varnish-S.
UPIA-AT, UPIA-ST has received high praises of usability and high performance.

(1) Thermal properties

Polyimide film obtained from "UPIA®" exhibits a high thermal decomposition temperature. Especially, "UPIA®-ST(U-Varnish-S)" has a thermal decomposition temperature above 550°C, so it does not soften, fluidize, or decompose under use temperatures and it is able to be used in high-temperature processes.
In addition, the polyimide coating has excellent dimensional stability even at high temperatures.

(2) Mechanical properties

Polyimide coating derived from "UPIA®" demonstrates excellent mechanical properties, especially high tensile strength and abrasion resistance.

(3) Electric properties

Polyimide coat obtained from "UPIA®" delivers a high electrical reliability, such as insulation.

(4) Chemical-Resistant Properties

"UPIA®" has excellent resistance to common organic solvents and metallic salt solutions, and it also demonstrates better resistance to acids and alkalis than conventional products. In addition, it delivers superior performance when it comes to abrasion resistance and non- flammability.

Chemical resistance data of UPIA-AT-1001(U-Varnish-A)

We will continue to develop special varnish grades delivering unique advantages for specific applications, based on properties of high heat resistance and chemical resistance.

(1) For secondary battery binder UPIA-LB

We have optimized UPIA-LB for lithium-ion battery binder applications.

• For battery binder applications, we strengthened and optimized the required characteristics according to our customers needs.
• UPIA-LB has the necessary toughness to overcome significant expansion of the electrode material.
• This varnish has high adhesion to Copper, aluminum and SUS, so you should improve the adhesion to the current collector compared to other binder types.
• This polyimide binder is highly resistant to the chemical exposure, it maintains performance, such as cracking resistance and adhesive strength, even immersed in the electrolyte solution
• It has excellent long-term heat resistance, so it is able to be used in high-temperature applications.
• UPIA-LB has excellent physical properties, even with relatively low temperature processing.