|  | "Soft TPO Formulations Containing Specialty Propylene Elastomers"
N. Dharmarajan, S. Srinivas, M.G. Williams, V. Gallez and S. Datta
(ANTEC 2005, May 2005, Boston, MA USA)
ABSTRACT
Vistamaxx polymers are Specialty Propylene Elastomers (SPE) 1containing
isotactic propylene crystallinity. The presence of the iPP crystallinity
renders these polymers very compatible with polypropylene (PP). When these
polymers are blended with PP, the flexural modulus of the composition is
substantially reduced at low weight fraction of SPE. This paper describes the
physical, rheological and morphological characteristics of SPE/PP blends,
comprising SPE resins of varying MFR and crystallinity.
The SPE composition in blends with a 3 MFR PP homopolymer is varied from 20
wt. % to 90 wt. The performance data is analyzed using regression models,
correlating the blend properties with SPE and PP type and content in the
formulation. Our results indicate that the SPE type, particularly
crystallinity, has a strong influence on the physical properties of the blend
formulations.
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