Method for making hexene-1 containing amorphous poly alpha olefins for improved hot-melt adhesives
US10738222B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2019 |
| Grant date | Aug 11, 2020 |
| Priority date | — |
| Expiry date | Apr 15, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J3/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method to make a hot-melt polymer formulation with from 50 wt % to 100 wt % of a propylene-co-butene-1-co-hexene-1 terpolymer or a propylene-co-hexene-1 copolymer, each polymer made using a metal chloride supported Ziegler-Natta catalyst, at a process temperature between about 130 degrees Fahrenheit and about 200 degrees Fahrenheit and at a reactor pressure sufficient to maintain the propylene in a liquid phase without solvent; using 1 wt % to 20 wt % of at least one of: a metallocene-catalyst made polymer; a homopolymer of propylene with 0.1%-5% functionality; and a styrene block copolymer; and wherein the melt viscosity of the terpolymer or copolymer formulation is controlled by addition of hydrogen gas as a chain transfer agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.