Polyolefin materials for rotational molding applications having improved impact properties and color stability
US10570270B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 2017 |
| Grant date | Feb 25, 2020 |
| Priority date | — |
| Expiry date | Mar 2, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K2003/267
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Provided herein are polyolefin-based compositions useful for making rotomolded parts having useful properties, including those related to impact resistance and color. In one aspect, there are provided compositions comprising (a) a rotational molded polyolefin, comprising a resin, wherein the resin is polyethylene or a copolymer thereof, having a melt index (MI) ranging from about 1 g/10 minutes to about 10 g/10 minutes; and (b) an additive package comprising: (i) an antioxidant; (ii) a processing stabilizer; (iii) optionally a UV light stabilizer; (iv) optionally a fatty acid-based acid scavenger comprising a metal salt of a fatty acid; and (v) a dihydrotalcite-based acid scavenger present in the composition at between about 800 ppm to about 3,000 ppm. In some embodiments, the ARM Impact Percent Ductility is greater than or equal to about 60% for a molded part made from the cured composition and measured after the composition has been cured between 18-24 minutes at a temperature of 550° F.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.