Butadiene-base polymer and a process for producing the same
US4540744A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 12, 1985 |
| Grant date | Sep 10, 1985 |
| Priority date | — |
| Expiry date | Feb 12, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S525/901
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A butadiene-base polymer containing a branched polymer through tin-carbon bond and a process for producing the same are disclosed. The butadiene-base polymer is produced by polymerizing 1,3-butadiene alone or 1,3-butadiene and aromatic vinyl compound in a hydrocarbon solvent in the presence of a Lewis base using an organolithium compound as an initiator and then coupling with a tin halide, and satisfies the following requirements: PA0 (1) a content of a bound aromatic vinyl compound in the butadiene-base polymer is 0-40% by weight; PA0 (2) a ratio of vinyl bond-containing butadiene unit in the toal butadiene unit of the butadiene-base polymer is 30-90%; PA0 (3) a ratio of the branched polymer in the butadiene-base polymer is at least 30% by weight; and PA0 (4) a ratio of a component having a molecular weight of less than 100,000 as polystyrene in the molecular weight distribution as measured by a gel permeation chromatography is 10-20% by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.