BASF, Audi, Covestro develop new clearcoat with biobased hardener

MUNSTER/ LEVERKUSEN, GERMANY: A team of employees from BASF’s coatings division, Audi and Covestro have collaborated, for the first time, developing a clearcoat containing a biobased hardener. And was applied to test bodies of the Audi Q2 under near-series conditions at the Audi plant in Ingolstadt, Germany.

This will help the automotive industry, manufacturers and suppliers who are working constantly to reduce energy consumption and CO2 emissions in production.

BASF developed the clearcoat using the biobased hardener Desmodur eco N 7300 from Covestro. A total of 70 percent of the hardener’s carbon content is sourced from renewable raw materials. This innovation reduces the consumption of fossil resources. The clearcoat forms the top layer of the coating system, lending it scratch resistance, a glossy appearance and protection against sunlight and other weather effects.

Improved eco-balance, high quality

“Our new clearcoat helps our customers to reach their sustainability targets, without having to compromise in terms of quality and performance,” said Dr Matthijs Groenewolt, head of clearcoat and topcoat development at BASF.

“Using renewable raw materials in the production of biobased hardeners helps to conserve fossil resources. At the same time, the biomass, as it grows, captures CO2 in the environment,” added Dr Markus Mechtel, head of marketing for automotive coatings at Covestro.

In addition, process steps are eliminated during biobased raw material production for this hardener, and thus leading to an additional reduction of CO2 emissions.

Promising test results

“The use of biobased raw materials in automotive coatings is still in its infancy. But the application of the new clearcoat on our existing machines fulfilled all our specifications and delivered promising results. With this project, Audi takes up a pioneering role in this field in the automotive industry,” said Thomas Heusser, head of materials and process engineering at Audi.

After successful coating of test bodies of the Audi Q2, Thomas Heusser is hopeful: “Even though not all tests required for approval of the coating for use in full-scale production have been concluded, the three companies have taken an important step toward an even more sustainable automotive coating process.”

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