|Schmidt, H.-W.; Blomenhofer, M.; Ganzleben, S.; Hanft, D.; Kristiansen, M.; Smith, P.; Stoll, K.; Mäder, D.; Hoffmann, K.: Trisamide based nucleating agents for isotactic polypropylene, Addcon World 2005, International Conference, 11th Hamburg Germany, Sept. 21-22, 2005 (2005)|
We report the discovery of a family of org. compds., substituted 1,3,5-benzene trisamides, that - depending on subtle details of their chem. structure- are capable of selectively and extremely efficiently nucleating the growth of the common a-crystal modification of the major industrial polymer isotactic polypropylene (i-PP); rendering this normally turbid material highly transparent ("clarified") at exceedingly low concns. (as low as a wt. fraction of 0.0002); inducing the mech. distinct, tough i-PP b-polymorph; or promoting growth of hybrids of both crystallog. modifications with heretofore unknown combinations of the above desirable optical-mech. properties. In addn., these trisamide-based compds. exhibit excellent thermal stability and organoleptic neutrality, and do not feature absorption of visible light, adding to a most favorable set of characteristics that provides marked benefits over presently employed nucleating/clarifying agents. It is anticipated that the present study advances the development of multi-functional additives for tailoring physico-chem. properties also of other polymers.