Thermoplastic elastomer compositions
AssigneeSolvay Engineered Polymers
InventorsXia Zhao, Hoan Tran, Charles G. Reid
Life of this patent
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Abstract
The invention relates to polymer compositions useful as thermoplastic elastomers for extrusion, calendering, blow molding, thermoforming, and foam processing, and to articles made therefrom. Such improved melt strength thermoplastic elastomers include a blend of propylenic resin (A) and ethylenic elastomer (B), wherein the (A) resin is partially branched and/or the (B) elastomer is partially crosslinked by the addition of multifunctional acrylic monomer (C) containing at least three acrylate groups.
Claims21
A thermoplastic elastomer composition comprising a modified blend of a propylenic resin, an ethylenic elastomer, and a multifunctional acrylic monomer that does not contain a methacrylate group comprising at least three acrylate groups, or a reaction product thereof, with the ethylenic elastomer being present in an amount by weight that is greater than that of the propylenic resin and wherein (a) the propylenic resin is at least partially branched, (b) the ethylenic elastomer is at least partially crosslinked to a gel content of at least about 25%, or (a) and (b), the modified blend having:
- a ratio of the melt strength of the modified blend to the melt strength of an unmodified blend of a propylenic resin that is not branched and an ethylenic elastomer that is not crosslinked of about 1.5 to 15 measured at a temperature of at least about 180° C.;
- a melt flow rate of less than about 1 dg/min measured at 230° C. under a 2.16 kg load;
- a melt flow rate of less than about 5 dg/min measured at 230° C. under a 10 kg load;
- and
- a hardness of less than about 95 Shore A or less than about 45 Shore D.
Dependencies are inferred from the claim text.