Polybutadiene rubber composition
US4812525A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jul 16, 1987 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | Jul 16, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L9/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A rubber composition is disclosed which contains, as a rubber component, 20-100% by weight of (A) polybutadiene polymerized by using a lithium initiator and 80 to 0% by weight of (B) another rubber component. The polybutadiene has the following physical properties (i)-(v): PA0 (i) The molecular weight distribution of Mw/Mn is 1.4 to 3.0 in which Mw and Mn are a weight average molecular weight and a number average molecular weight, respectively; PA0 (ii) A polymer component having the molecular weight being not more than 10.sup.5 when calculated as polystyrene is from 7 to 25%; PA0 (iii) The content of bound vinyl groups is from 10 to 25%; PA0 (iv) The content of tin atoms bonded to the polymer by tin-carbon bonds is not less than 50 ppm; PA0 (v) Mooney viscosity (ML.sub.1+4, 100.degree. C.) is from 20 to 70.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.