Polypropylene copolymer composition having subzero impact resistance
US12221530B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 2020 |
| Grant date | Feb 11, 2025 |
| Priority date | — |
| Expiry date | Jul 16, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2207/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polypropylene polymer compositions are disclosed that can be formulated to have excellent clarity properties in conjunction with excellent impact resistance properties at subzero temperatures. The polypropylene polymer compositions are heterophasic compositions containing a first phase polymer combined with a second phase polymer. The first phase polymer is a polypropylene and alpha-olefin copolymer while the second phase polymer is also a polypropylene and alpha-olefin random copolymer. The second phase polymer contains relatively high amounts of ethylene. The increased amounts of ethylene in the second phase polymer were found to dramatically improve impact resistance at subzero temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.