Smit & Zoon Patent Application

Patent Application Smit & zoon files patent application on bio-based leather retanning chemicals.
Smit & zoon first leather chemical company to use lignin modified polyphenolic leather chemicals.

Smit & zoon just filed a European patent application for ‘lignin modified polyphenolic leather chemicals’. This makes Smit & zoon the first leather chemical company to use lignin modified polyphenolic in its products. Smit & zoon’s product development team is currently testing lignin-based products.

Dr. Yujie Ma, R&D scientist, and Ms. Petra Berends, Product technologist, both member of the Bio-based platform within Smit & zoon’s research department, lead the research on using lignin in retanning agents. The patent describes the smart utilization of industrial lignin to mix with phenol in the production of otherwise 100% petro-based polyphenolic retanning chemicals. Part of the phenol in the concerning products is replaced by lignin during the chemical conversion process.

Positive First Trials
Trials with lignin-based products are currently taking place. Dr. Ma is pleased with the first results: “First trials show a great outcome on leather. The lignin-based products bring fullness and softness and result in an equal and intense dye.”

Bio-based Platform
Smit & zoon’s Bio-based platform aims to increase the bio-based content and the degree of biodegradability in the company’s leather chemical portfolio. This is in line with Smit & zoon’s CSR ambition to play a catalyzing role in making the leather value chain largely sustainable by 2025.

A Natural Polymer
Lignin is a natural cross-linked polyphenol derived from biomass that is formed in the cell walls of wood or agricultural crops and plants providing structural strength. Lignin constitutes about 20-35% of the mass of every tree or plant and is the most abundant natural aromatic resource. As a by-product from the pulp and paper industry, lignin is currently mainly burned to generate energy.


Source: Smit & Zoon