Patent ID: 7608295
Filing Date: 2009-10-27
Classification: C03C,C04B,C08G,H01L,H05K

Abstract:
1. A method of repairing a ceramic substrate comprising the steps of: providing a ceramic substrate having a defect; coating the defect region with a polyamic acid composition comprising an aromatic diamine monomer and an aromatic dianhydride monomer, where both of the monomers are flexible and a stoichiometric excess of one of the monomers is used, and subsequently endcapping with an amine or anhydride depending on which monomer was used in excess, and wherein the dianhydride monomer is oxydiphthalic anhydride (ODPA) and the aromatic diamine monomer is 1,3-bis(3′-aminophenoxy)benzene (1,3,3′-APB) or the dianhydride monomer is ODPA and the diamine monomer is a mixture of 1,3,3′-APB and one or both of 4,4′-oxydianiline (4,4′-ODA) and 3,4′-oxydianiline (3,4′-ODA); and curing the polyamic acid coating to form a flexible polyimide.