Patent ID: 7671141
Filing Date: 2010-03-02
Classification: C08G,C09K,Y10S

Abstract:
1. A process for preparing a second order nonlinear optic polyimide polymer of formula (I), wherein: R R wherein when R and when R wherein R is a phenyl or styryl group that is 3-substituted with a group selected from the —NO x+y+z=100% of the repeating units, x is at least 1%, and either or both of y and z can be zero; the process comprising the steps of: reacting 4,4′-(hexafluoroisopropylidene)diphthalic anhydride with a compound of formula wherein R 1 is the same as that defined for formula (I), optionally in the presence of m-phenylenediamine, so as to form a host polyimide polymer comprising repeating units represented by the formula: wherein R grafting the thus formed host polyimide polymer with a compound of formula R wherein: R when R when R and R 2 ′ represents a group of formula wherein R is a phenyl or styryl group that is 3-substituted with a group selected from —NO