申请人:ROLIC AG
                            
                            
                                公开号:US20170362381A1
                            
                            
                                公开(公告)日:2017-12-21
                            
                            A thermally stable diamine compound of formula (I′) is proposed as well as polymers, copolymers, polyamic acids, polyamic acid esters, or polyimides based on such compound. Also, a process of preparing orientation layers for liquid crystals including preparing orientation layers for liquid crystals from thermally stable alignment materials comprising diamine compounds of formula (I′).