Method of making thermally removable adhesives
AssigneeSandia Corporation
InventorJames H. Aubert
Life of this patent
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Abstract
A method of making a thermally-removable adhesive is provided where a bismaleimide compound, a monomeric furan compound, containing an oxirane group an amine curative are mixed together at an elevated temperature of greater than approximately 90° C. to form a homogeneous solution, which, when cooled to less than approximately 70° C., simultaneously initiates a Diels-Alder reaction between the furan and the bismaleimide and a epoxy curing reaction between the amine curative and the oxirane group to form a thermally-removable adhesive. Subsequent heating to a temperature greater than approximately 100° C. causes the adhesive to melt and allows separation of adhered pieces.
Claims19
A method of making a thermally-removable adhesive, comprising the steps of:
- mixing a bismaleimide compound and a monomeric furan compound, said monomeric furan compound containing an oxirane group, at an elevated temperature of greater than approximately 90° C. to form a homogeneous solution;
- mixing a curative at said elevated temperature to form a second homogeneous mixture;
- and
- cooling said second homogeneous mixture to a temperature less than approximately 70° C. to simultaneously initiate a Diels-Alder reaction between said furan and said bismaleimide and a epoxy curing reaction between said curative and said oxirane group, thereby forming a thermally-removable adhesive.
A method of adhering two pieces together, comprising:
- mixing a bismaleimide compound and a monomeric furan compound, said monomeric furan compound containing an oxirane group, at an elevated temperature of greater than approximately 90° C. to form a homogeneous solution;
- mixing a curative at said elevated temperature to form a second homogeneous mixture;
- cooling said second homogeneous mixture to a temperature less than approximately 70° C. to form a thermally-removable adhesive;
- contacting said thermally-removable adhesive to the surface of a first piece;
- heating to a temperature greater than approximately 90° C.;
- contacting the surface of a second piece to the thermally-removable adhesive to form a two-piece system;
- and
- curing said two-piece system by cooling to less than approximately 70° C. to adhere the first piece to the second piece.
A method to form a conformal coating solution, comprising comprising the steps of:
- mixing a bismaleimide compound and a monomeric furan compound, said monomeric furan compound containing an oxirane group, at an elevated temperature of greater than approximately 90° C. to form a homogeneous solution;
- mixing a curative at said elevated temperature to form a second homogeneous mixture;
- diluting said homogeneous mixture with a solvent;
- and
- applying said diluted homogeneous mixture to a surface at a temperature less than approximately 70° C. to simultaneously cure and evaporate at least a portion of said solvent to form a thermally-removable conformal coating.
Dependencies are inferred from the claim text.