Synthesis of macrocyclic polymers having low hysteresis compounded properties
US5700888A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 10, 1996 |
| Grant date | Dec 23, 1997 |
| Priority date | — |
| Expiry date | Nov 10, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T152/10495
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a method of anionic synthesis of stable macrocyclic polymers that are compounded to form vulcanizable elastomeric compounds exhibiting reduced hysteresis properties. Cyclic organometallic compounds containing divalent metal atoms of Groups IIA and IIB of the Periodic System are employed as initiators of anionic polymerization of conjugated diene, vinyl aromatic and/or triene monomers. Coupling of the living ends of the resulting macrocyclic polymers or copolymers with a coupling agent or a coupling agent that is also a functionalizing agent results in stable macrocyclic polymers with improved hysteresis properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.