US Patent Issued to 3M Innovative Properties on April 22 for "Polycarbonate polymer with siloxane repeat units, compositions, and methods" (Minnesota Inventors)

ALEXANDRIA, Va., June 6 -- United States Patent no. 12,281,199, issued on April 22, was assigned to 3M Innovative Properties Co. (St. Paul, Minn.).

"Polycarbonate polymer with siloxane repeat units, compositions, and methods" was invented by Carl A. Laskowski (Minneapolis) and Paul B. Armstrong (St. Paul, Minn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Polycarbonate polymers comprising non-aromatic cyclic groups bonded with carbonate linking groups are described. A portion of the non-aromatic cyclic groups comprise a substituent having siloxane repeat units. Representative formulas of the substituents having siloxane repeat units include -CH2-CH2-Si(R4)2-(OSi(R4)2-R5, and -CH[Si(R4)2-(OSi(R4)2)m-R5]-CH3...