Abstract: Halogenated butyl rubbers are provided comprising lignins and co-reinforcing agents, where the ratio of the lignin to the co-reinforcing agent is selected so as to effectively modulate advantageous properties of the vulcanizate. The advantageous properties are achieved when using a ratio of lignin to the co-reinforcing agent, such as carbon black or silica, that is higher than in a reference vulcanizate, in effect the substitution of lignin for conventional reinforcing agents improves the reinforcement of the vulcanizates.

Abstract: Anthropogenic derivatives of native lignin are disclosed, having specific viscoelastic metrics which selectively facilitate the processing of these lignin derivatives into particular finished products. Such lignin derivatives are characterized by rheological metrics that include minimum storage modulus (G?min), onset of softening temperature (T1), and/or cross-over temperature (T2) from predominately viscous to predominately elastic behaviour.