B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
B24D3/28—Resins or natural or synthetic macromolecular compounds
B24D3/285—Reaction products obtained from aldehydes or ketones
Procede pour l'obtention d'une lentile optique en matiere synthetique thermoplastique revetue d'une couche de protection en matiere synthetique thermodurcissable