Soft and strong elastomeric compositions from semicrystalline-amorphous polyolefin block copolymers
US8993672B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 2008 |
| Grant date | Mar 31, 2015 |
| Priority date | — |
| Expiry date | Aug 15, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/03
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Polyolefin block and graft copolymers comprised of two or more semicrystalline polyolefin blocks or grafts and one or more amorphous polyolefin blocks can be blended with a low molecular weight fluid diluent that preferentially locates within and swells the amorphous domains of the block or graft copolymer, while preserving the crystallinity of the semicrystalline block domains. After mechanical or thermomechanical processing, such compositions combine softness with high strength and high recoverable elasticity. Compositions are also disclosed whereby the diluent species is removed from the composition, either before or after the mechanical or thermomechanical processing, in order to create a strong elastic material with an ultra-low entanglement density within the amorphous domains.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.