Macromolecular compounds [2013???01]C04B 41/4803. . . . {Polysaccharides, e.g. cellulose, or derivatives thereof} [2013???01]C04B 41/4807. . . . {Proteins or derivatives thereof} [2013???01]C04B 41/4811. . . . {Condensation polymers of aldehydes or ketones} [2013???01]NOTE In this group the following term is used with the meaning indicated: aldehydes" also covers other organic compounds reacting