Patent ID: 6919420
Filing Date: 2005-07-19
Classification: C08G,H01L,Y10T

Abstract:
1. A reworkable thermoset which can be b-staged into a tack free state and which softens considerably during heating before final cure comprising: an epoxy-containing oligomer having the formula: wherein X is the same or different, and is selected from the group consisting of: at least one R 1 must be a cleavable epoxy, and if more than one, may be the same or different, and said R 1 being selected from the group consisting of: and any R 1 which is not an epoxy, may be a precursor to said epoxies and may be the same or different, said R 1 is selected from the group consisting of: Q is selected from the group consisting of: and n is 1 to 6 said epoxy groups, in said epoxy-containing oligomer, after said epoxy-containing oligomer is cured, being cleavable using an acid selected from the group consisting of an organic acid and a Lewis acid.