Catalyst for synthesizing high trans polymers
US7189792B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2005 |
| Grant date | Mar 13, 2007 |
| Priority date | — |
| Expiry date | Dec 19, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F36/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The process and catalyst of this invention can be utilized to synthesize homo and copolymers of conjugated diene monomers and vinyl aromatic monomers having high trans contents of greater than 60% with low melting points. These homo and copolymers of conjugated diene monomers and vinyl aromatic monomers can be utilized in tire tread and sidewall rubbers that exhibit outstanding wear and tear characteristics in the tread and excellent flexing properties in the sidewall. The rubber polymers of this invention are made utilizing an improved catalyst system. This catalyst system is comprised of (a) organo aluminum compounds, (b) organo lithium compounds, (c) a barium compound selected from barium salts of (i) di(ethylene glycol) ethyl ether, (ii) di(ethylene glycol) propyl ether, (iii) di(ethylene glycol) hexyl ether, (iv) di(N,N-dimethyl amino glycol) ethyl ether, (v) menthol and thymol in the presence of polar modifier consisting of water, alcohols, amines, thiols, phosphates and phosphites. The trans polymers and copolymers of this invention made with the above catalyst system typically have a glass transition temperature ranging from −97° C. to −40° C., a melt temperature ranging fr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.