Silicone-Polyimide Polymers As Adhesion Promoters
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Silicone-polyimide polycondensation polymers either in the polyamic state or prepolymerized, when diluted to low solids of 1-10%, can be used as adhesion promoters. The silicone segment of the silicone- polyimide copolymer (SPC) serves to impart excellent wetting, adhesion, and resistance to moisture at the interface. The polyimide segment of the SPC can react with or solubilize the subsequent polyimide coating to form an inseparable interpenetrating network. Use of the silicone polyimide as a prepolymer (polyamic acid) can be used to advantage to react with a monomeric or polyamic system so that, with cure, the promoter and coating may co-cure. Either an imidized or a non-imidized polyimide coating can be used with either an imidized or a non-imidized SPC.