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Composition improves thickening while holding the line on cost
The U.S. Patent and Trademark Office has issued patent No. 7,932,309 to Paul Gillette, technology platform director, and Arjun Sau, principal scientist, Ashland Specialty Ingredients.
What is it?
Titled "Ether derivatives of raw cotton linters for waterborne coatings," the patent is a waterborne coating composition that contains an ether derivative of raw cotton linters, a latex polymer and water. The ether derivative provides improved rheological properties compared to similar cellulose ether compounds produced from more refined – and more expensive – cellulose sources.
The composition improves thickening in coatings such as latex paints. Coatings manufacturers have to consider the overall performance and cost of a thickener during formulation. Will it maintain target viscosity during storage? Will it provide the best application properties? Cellulose ethers produced from purified cotton linters and wood pulp can be very expensive to use in latex paint formulation.
Benefits
Gillette and Sau designed a cellulose ether derivative with superior viscosity buildup capacity, making it perform better in waterborne formulations, like latex paint. Because of the derivative's excellent performance, formulators don't have to use as much, reducing their overall cost. Cost is key, as the material traditionally used to produce high viscosity cellulose ethers has tripled in price over the past few years.
This high-quality composition passed the test on key attributes such as thickening efficiency, leveling, sagging, gloss, hiding, brightness and scrub resistance.
