oup, an alkylene group, wherein R4 is an alkyl or alkylene group or an aryl or arylene group; R2 and R3, which can be the same or different,...http://www.google.es/patents/US6551393?utm_source=gb-gplus-sharePatente US6551393 - Methods of making a particle having an attached stable free radical B???squeda avanzada de patentes N???mero de publicaci???nUS6551393 B2Tipo de publicaci???nConcesi???n N??