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Method of making thermally removable polyurethanes

United States Patent

June 11, 2002
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A method of making a thermally-removable polyurethane material by heating a mixture of a maleimide compound and a furan compound, and introducing alcohol and isocyanate functional groups, where the alcohol group and the isocyanate group reacts to form the urethane linkages and the furan compound and the maleimide compound react to form the thermally weak Diels-Alder adducts that are incorporated into the backbone of the urethane linkages during the formation of the polyurethane material at temperatures from above room temperature to less than approximately C. The polyurethane material can be easily removed within approximately an hour by heating to temperatures greater than approximately C. in a polar solvent. The polyurethane material can be used in protecting electronic components that may require subsequent removal of the solid material for component repair, modification or quality control.
Loy; Douglas A. (Albuquerque, NM), Wheeler; David R. (Albuquerque, NM), McElhanon; James R. (Livermore, CA), Saunders; Randall S. (late of Albuquerque, NM), Durbin-Voss; Marvie Lou (Albuquerque, NM)
Sandia Corporation (Albuquerque, NM)
09/ 863,173
May 22, 2001
This invention was made with Government support under Contract No. DE-AC04-94AL85000 awarded by the Department of Energy. The Government has certain rights in the invention.