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US 11,535,733 B2Granted
Clarified polypropylene for long term color performance
AssigneeFina Technology, Inc.
InventorsMichael McLeod, John Ashbaugh, Marc Mayhall
Life of this patent
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Abstract
Color-stable rheology controlled polyolefin compositions and methods of making are described. A color-stable rheology controlled polyolefin composition can include a controlled rheology grade thermoplastic polyolefin, and an effective amount of a trisamide-based compound that imparts color-stability to the composition. The color-stable solid-state thermoplastic polyolefin composition can have a Hunter b value color change (Δb) rate of ≤0.03/day when stored at 93° C. for 50 days.
Claims16
A color-stable solid-state thermoplastic polyolefin composition comprising:
- (a) a vis-broken thermoplastic polyolefin;
- and
- (b) a trisamide-based compound,
- (c) a hindered amine light stabilizer;
- (d) a glycerol monostearate;
- (e) an organic peroxide;
- (f) a metal stearate;
- and
- (g) a phosphite-based antioxidant;
- wherein the color-stable solid-state thermoplastic polyolefin composition has a Hunter b value color change (Δb) rate of ≤0.03/day when stored at 93° C. for 50 days, wherein the color-stable solid-state thermoplastic polyolefin composition has a melt flow rate (MFR) as measured by ASTM D1238 ranging from 5 dg/min to 150 dg/min.
7 more elements
Dependencies are inferred from the claim text.