A composition for forming a bone cement or the like, comprising a powder component and a monomer component, the powder component comprising ethylmethacrylate polymer beads incorporating particles of opacifier therein and the monomer component comprising n-butyl methacrylate....http://www.google.com.au/patents/US4791150?utm_source=gb-gplus-sharePatent US4791150 - Composition for use in making bone cement
