Synthesis of styrene-butadiene rubber
US6372863B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2000 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Oct 6, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60C1/0016
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention discloses a process for synthesizing random styrene-butadiene rubber comprising: (1) continuously charging 1,3-butadiene, styrene, an initiator, and a solvent into a first polymerization zone, (2) allowing the 1,3-butadiene and styrene to copolymerize in the first polymerization zone to total conversion of 60 to 90 percent to produce a polymer cement containing living styrene-butadiene chains, (3) continuously charging the polymer cement containing living styrene-butadiene chains and additional 1,3-butadiene monomer into a second polymerization zone, wherein from 20 to 40 percent of the total amount of 1,3-butadiene changed is charged into the second polymerization zone, (4) allowing the copolymerization to continue in the second polymerization zone to a conversion of the 1,3-butadiene monomer of at least 90 percent, wherein the total conversion of styrene and 1,3-butadiene in the second polymerization zone is limited to a maximum of 95 percent, (5) withdrawing a polymer cement of random styrene-butadiene rubber having living chain ends from the second reaction zone, (6) killing the living chain ends on the random styrene-butadiene rubber, and (7) recovering the rand…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.