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US 12,441,872 B2Granted
Rotomolding composition
AssigneeNOVA Chemicals (International) S.A.
InventorsCarmine D'Agostino, Gilbert Arnould, Celine Bellehumeur, Henry Hay, Van Dang
Life of this patent
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Abstract
A rotomolding composition comprises a blend of two polyethylenes: 1) a well stabilized polyethylene; and 2) a poorly stabilized polyethylene having a very low flow rate. The poorly stabilized polyethylene is further characterized by having a large particle size (from 500 to 3000 microns). Rotomolded parts prepared from the composition have a rough inner surface. Polyurethane foam adheres well to this rough surface.
Claims9
A polyethylene composition comprising:
- 1) From 85 to 99 weight % of a stabilized polyethylene having a melt index, I2, as measured by ASTM D 1238 at 190° C. using a 2.16 kg lead, of from 0.5 to 10 grams/10 minutes;
- a density as measured by ASTM D792 of from 0.920 to 0.950 g/cc;
- and
- 2) From 15 to 1 weight % of a substantially non-stabilized polyethylene having (i) a high load melt index, I21, as measured by ASTM D1238 at 190° C. using a 21.6 kg load, of from 2 to 20 grams/10 minutes;
- (ii) a density of from 0.950 to 0.965 g/cc as measured by ASTM D792;
- and (iii) an average particle size of from 500 to 3000 microns;
- wherein:
- the stabilized polyethylene contains a stabilizer package comprising a primary antioxidant and a secondary antioxidant;
- the substantially non-stabilized polyethylene contains less than 100 ppm of primary antioxidant and/or secondary antioxidant;
- and
- an average particle size of said stabilized polyethylene is smaller than the average particle size of said substantially non-stabilized polyethylene.
8 more elements
Dependencies are inferred from the claim text.