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Additives help customers manage end-product specifications
The U.S. Patent and Trademark Office has issued patent No. 7,902,312 to Qu-Ming Gu, principal scientist, and Ronald Staib, technical director, Ashland Water Technologies.
Titled “Michael addition adducts as additives for paper and papermaking,” the patent covers a series of resins made by Michael addition to polymers such as polyvinylamine that increase wood-containing paper's tolerance to water-based printing processes.
A Michael addition is a chemical reaction that adds bonding electrons to electron-deficient alkenes (chemical compound containing at least one carbon-to-carbon double bond). These Michael addition adducts are useful in paper manufacturing and are particularly useful as dry strength additives to make paperboard products such as linerboard. The patented adducts are also used as retention and drainage aids for papermaking.
The technology covered in this patent helps reinforce our Hercobond™ 6000 paper performance additives portfolio to provide unparalleled levels of dry strength that enable paperboard packaging and tissue and towel manufacturers to meet their strength and productivity needs. These tools help our customers manage end-product specifications – such as weight, fiber and additive usage – as well as enhance profitability, and develop new grades.
