Patente US4970287 - Thermally stable phenolic resin compositions with ortho, ortho methylene linkage - Google PatentesB???squeda Im???genes Maps Play YouTube Noticias Gmail Drive M???s ??Iniciar sesi???n B???squeda avanzada de patentesPatentesA phenolic resin composition comprising units of formula (I): ##STR1## wherein R1 is a halogen and R2 is a lower alkyl group having 1 to 4 carbon atoms, and