Archroma, a global leader in color and specialty chemicals, today announced a successful outcome from opposition proceedings held at the European Patent Office (EPO).

The invention, which allows more efficient use of optical brightening agents, is a new illustration of how Archroma continuously works with its partners in the paper industry to provide innovations that combine both performance and ecological benefits.

On August 22, 2012, the EPO granted Archroma and International Paper a European patent, which is presently in force in fifteen member states of the European Patent Convention. The patent claims and protects aqueous sizing compositions for optical brightening of substrates for ink jet printing comprising binder, divalent metal salt, and a specific optical brightener. The European Patent 2,192,230, jointly owned by Archroma and International Paper, was upheld with only minimal amendment to the scope of the claims. The oral proceedings of October 6, 2015 resulted following an opposition to the patent filed by two parties. The Opposition Division of the EPO came to this decision on October 6, 2015 after a public hearing in opposition proceedings. The reasons for the Opposition Division’s decision, setting out a full assessment of the facts and arguments, will be published at a later date.

Valerie Diele-Braun, President of Archroma’s Paper Solutions, comments: “We are pleased that the invention resulting from a joint development between our two companies has been confirmed by the EPO. Archroma takes pride in working with customers to provide innovative solutions delivering business success.”

Archroma and International Paper were represented at the oral proceedings by the law firm of Wallinger, Ricker, Schlotter, Tostmann (WRST).


Media Relations

Marilyn Chua



Notes For Editors

About Archroma

Archroma is a global, diversified provider of specialty chemicals serving the branded and performance textiles, packaging and paper, and coatings, adhesives and sealants markets.

Headquartered in Pratteln, Switzerland, Archroma operates with more than 4,500 employees located in 42 countries and with over 30 production sites.

Archroma is passionate about delivering leading and innovative solutions, enhancing people’s lives and respecting the planet. The company is committed to the principles of "The Archroma Way to a Sustainable World: Safe, Efficient, Enhanced. It's our nature!"; an approach reflected in its innovations, world-class quality standards, high service levels and cost-efficiency.

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