Patent ID: 8871834
Filing Date: 2014-10-28
Classification: C08K,C08L

Abstract:
1. Process for the reduction of headspace emission in a polymer composition, comprising: (a) at least 50 wt.-% polypropylene, (b) 100 to 5,000 ppm of phenolic antioxidants (AO), (c) optionally 100 to 5,000 ppm of phosphorous antioxidants based on the polymer composition, the process comprising the steps: (i) providing a talc (T); (ii) treating the talc (T) to obtain a coated talc (CT); and (iii) reducing the amount of headspace emission by adding 10,000 to 550,000 ppm of the coated talc (CT) to the polymer composition to provide a headspace emission measured according to VDA 227 wherein said talc (CT) is coated with an organo-metallic compound (OM), said organo metal compound (OM) is defined by formula (I) or formula (II), said formula (I) is wherein “M” is a metal of the groups 4 to 13 of the Periodic Table, “A R is an alkyl-, alkenyl-, alkinyl- or arylalkyl residue with 1 to 30 carbon atoms, R′ is an alkyl-, alkenyl-, alkinyl- or arylalkyl residue with 1 to 30 carbon atoms, and said formula (II) is wherein “M” is a metal of the groups 4 to 13 of the Periodic Table, “A B is CR″ D is (CR′″) R′ is an alkyl-, alkenyl-, alkinyl- or arylalkyl residue with 1 to 30 carbon atoms, R″ is —H, —CH R′″ is selected from the group conisting of —H, —CH n is 1 or 2, wherein said polymer composition having coated talc has a lower headspace emission than the same composition but with unmodified talc.