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US 2015/0087787 A1Published application
Polypropylene blends and processes for producing polymeric compositions
AssigneesDow Global Technologies LLC, GnoSys Global Ltd., University of Southampton
InventorsSimon J Sutton, Theo E. Geussens, Alun Vaughan, Gary Stevens
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Abstract
Polymer blends of polypropylene homopolymer and propylene-α-olefin interpolymer. Processes for producing polymeric compositions comprising control-cooling heated blends of polypropylene and propylene-α-olefin interpolymer. Such polymeric compositions can be employed in forming coated wires and cables.
Claims10
A process for preparing a thermoplastic polymeric composition, said process comprising:
- (a) heating a polymer blend comprising a polypropylene homopolymer and a propylene-α-olefin interpolymer to a melt temperature of greater than 140° C. and at least the melting temperature of either the polypropylene homopolymer or the propylene-α-olefin interpolymer, whichever is greater, for a time sufficient to form a polymer melt blend;
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- (b) cooling said polymer melt blend from said melt temperature down to ambient temperature, wherein said cooling comprises:
- (i) non-control-cooling said polymer melt blend from said melt temperature to an initial cooled temperature in the range of from 140 to 125° C.,
- (ii) control-cooling said polymer melt blend at an average cooling rate in the range of from 0.1 to 30° C. per minute from said initial cooled temperature to an intermediate cooled temperature in the range of from 110 to 100° C., and
- (iii) cooling, by either control-cooling or non-control-cooling, said polymer melt blend from said intermediate cooled temperature to ambient temperature, thereby forming said polymeric composition.
3 more elements
Dependencies are inferred from the claim text.