Method for stabilizing monovinylarene/conjugated diene copolymers and a method for preparing a stabilizing mixture
US5422389A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1994 |
| Grant date | Jun 6, 1995 |
| Priority date | — |
| Expiry date | Feb 4, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2309/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for stabilizing polymers is provided comprising: PA1 (1) contacting at least one hindered phenolic compound and an organic phosphite to form a stabilizing mixture, PA1 wherein said contacting is at a temperature sufficient to at least partially dissolve said hindered phenolic compound, PA1 wherein said stabilizing mixture is essentially free of organic solvent; and PA1 (2) contacting said stabilizing mixture and a polymeric composition comprising a monovinylarene/conjugated diene copolymer; PA1 wherein said organic phosphite and said at least one hindered phenolic compound are present in step (2) in an effective amount sufficient to stabilize said polymeric composition. In accordance with another aspect of this invention a method for preparing a stabilizing mixture essentially free of organic solvent is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.