Back to results
US 11,401,405 B2Granted
Methods for improving color stability in polyethylene resins
AssigneeChevron Phillips Chemical Company LP
InventorsJustin Wade Kamplain, Elizabeth Mary Lanier
Life of this patent
Estimating the term…
Abstract
Polymer compositions containing a titanated chromium-based ethylene polymer, 150-350 ppm of zinc stearate and/or calcium stearate, 50-5000 ppm of a phenolic antioxidant, 200-3000 ppm of a diphosphite antioxidant, and optionally, 200-3000 ppm of a monophosphite antioxidant, are described. These polymer compositions have improved long-term color stability, as well as lower levels of color formation after aging.
Claims22
A polymer composition comprising:
- a titanated chromium-based ethylene polymer comprising an ethylene homopolymer and/or an ethylene/α-olefin copolymer;
- (ii) from about 150 ppm to about 350 ppm of zinc stearate and/or calcium stearate;
- (iii) from about 50 ppm to about 5000 ppm of a phenolic antioxidant;
- and
- (iv) from about 200 ppm to about 3000 ppm of a diphosphite antioxidant;
- and
- wherein the polymer composition has a Δcolor/Δtime of less than 45.
4 more elements
A polymer composition comprising:
- (i) a titanated chromium-based ethylene polymer comprising an ethylene homopolymer and/or an ethylene/α-olefin copolymer;
- (ii) from about 150 ppm to about 350 ppm of zinc stearate and/or calcium stearate;
- (iii) from about 50 ppm to about 5000 ppm of a phenolic antioxidant;
- (iv) from about 200 ppm to about 3000 ppm of a monophosphite antioxidant;
- and
- (v) from about 200 ppm to about 3000 ppm of a diphosphite antioxidant;
- and
- wherein the polymer composition has a Δcolor/Δtime of less than 45.
5 more elements
Dependencies are inferred from the claim text.