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AssigneeSandia Corporation
InventorsDouglas A. Loy, David R. Wheeler, James R. McElhanon, Randall S. Saunders
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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 90° C. The polyurethane material can be easily removed within approximately an hour by heating to temperatures greater than approximately 90° 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.
A method of making a thermally-removable polyurethane, comprising the steps of:
A method of making a thermally-removable polyurethane, comprising the steps of:
A method of making a thermally-removable polyurethane, comprising the steps of:
The method of claim 15 wherein the solid polyerethane is depolymerized by dissolution in a polar solvent at a temperature greater than approximately 90° C.
A method of making a thermally-removable polyurethane, comprising the steps of:
A method of making a thermally-removable polyurethane, comprising reacting a maleimide compound functionalized with an alcohol with a furan compound functionalized with an isocyanate at a reaction temperature less than approximately 90° C. to form a solid thermally-removable polyurethane within approximately 10 minutes material wherein the solid thermally-removable polyurethane material has the property that subsequent heating to a temperature greater than approximately 90° C. in a solvent will depolymerize the solid.
A method of making a thermally-removable polyurethane, comprising reacting a maleimide compound functionalized with an isocyanate and a furan compound functionalized with alcohol at a reaction temperature less than approximately 90° C. to form a solid thermally-removable polyurethane within approximately 10 minutes material wherein the solid thermally-removable polyurethane material has the property that subsequent heating to a temperature greater than approximately 90° C. in a solvent will depolymerize the solid.
A method of making a thermally-removable polyurethane, comprising reacting a maleimide compound functionalized with an alcohol, a furan compound functionalized with an alcohol, and a diisocyanate at a reaction temperature less than approximately 90° C. to form a solid thermally-removable polyurethane within approximately 10 minutes material wherein the solid thermally-removable polyurethane material has the property that subsequent heating to a temperature greater than approximately 90° C. in a solvent will depolymerize the solid.
A method of making a thermally-removable polyurethane, comprising reacting a maleimide compound functionalized with an isocyanate, a furan compound functionalized with an isocyanate, and a polyol at a reaction temperature less than approximately 90° C. to form a solid thermally-removable polyurethane within approximately 10 minutes material wherein the solid thermally-removable polyurethane material has the property that subsequent heating to a temperature greater than approximately 90° C. in a solvent will depolymerize the solid.
Dependencies are inferred from the claim text.