In leather finishing, the topcoat resin largely determines a product’s visual quality. Conventional high‑gloss topcoats often force a compromise: high shine comes at the expense of flexibility and heat resistance, producing stiff, crack‑prone leather that cannot withstand demanding high‑temperature leather calendering processes.

Technical Control’s Solution

Technical Control PU‑778L is an anionic aliphatic waterborne polyurethane dispersion engineered to overcome these limitations. Formulated as a high‑gloss topcoat for leather surface treatment, PU‑778L delivers stable room‑temperature performance and reliable behavior under high‑temperature leather calendering —combining superior aesthetics with functional durability.

Product Features and Advantages

High Gloss and Clarity

Produces a clear, luminous finish that preserves and enhances the underlying color and grain for a deep, high‑lustre appearance.

Excellent Anti-sticky Property

Provides outstanding blocking resistance to minimize tack and transfer during processing and storage. The final film feels smooth and fine, improving the leather’s hand and wearer comfort.

Tough and Elastic

As an aliphatic PU, it provides protective toughness while maintaining elasticity. Excellent low‑temperature flex resistance reduce surface cracking on garments and footwear.

Outstanding Abrasion Resistance

Forms a wear‑resistant film that protects against everyday friction, maintaining surface sheen and prolonging decorative life.

Heat Resistance

Withstands heat‑press operations without deformation or blocking, reliably producing high‑gloss finishes after thermal treatment.

High‑Temperature Leather Calendering

High‑temperature leather calendering is a vital post‑treatment that uses rapid heat and pressure to reflow and level the topcoat, yielding an even, glossy surface. PU‑778L is specifically designed to reflow and stabilize under these conditions, delivering consistently smooth, high‑gloss results.

Applications

PU‑778L is ideal for leather applications that demand both high gloss and excellent physical performance:

Premium apparel and upholstery leathers — bright, transparent gloss with a pleasant hand feel and outstanding physical properties.

Footwear and decorative leathers — excellent abrasion and flex resistance to meet daily use requirements.

Processing Compatibility

PU‑778L can be used for roll‑coating or spray‑coating processes and works well with a range of anionic auxiliaries, giving formulators the flexibility to fine‑tune formulations for specific production needs.

Product Parameters