A high performance epoxy based coverlay and bond ply...

C - Chemistry – Metallurgy – 08 – L

Patent

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154/141, 117/30,

C08L 61/14 (2006.01) C08G 59/14 (2006.01) C08G 63/685 (2006.01) C08G 63/91 (2006.01) C08L 67/00 (2006.01) C09J 7/02 (2006.01) C09J 161/14 (2006.01) C09J 163/00 (2006.01) C09J 163/10 (2006.01) C09J 167/00 (2006.01) C09J 179/00 (2006.01) C08G 59/50 (2006.01)

Patent

CA 2004131

A high performance laminating coverlay, and bond ply adhesive material includes one or more epoxy components which inter-react with a high molecular weight polyester component through a two-stage reaction sequence. The first stage of the reaction sequence includes a reaction between an aziridine cure component and a polyester component. The second stage of the sequence involves a reaction between the aziridine/polyester component and the epoxy component(s). The resulting adhesive material provides a flexible, fully cross linked adhesive material with good Z-axis stability and without the evolution of volatile by-products. This resulting adhesive material can be used in bonding polyimide films to etched circuit patterns to provide a high temperature resistant, solvent resistant, moisture resistant, insulating material with good flow properties under normal elecronic circuit processing and environmental conditions. The adhesive material can be used as a bond ply adhesive material for flexible base, hardboard, and multilayer electronic circuit material applications, as well as surface to surface bonding of other materials. In addition, the adhesive material, prior to the second reaction, is stable and has a long shelf life.

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