Method for the continuous preparation of heat-vulcanizing silicone rubber compounds
US5409978A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1994 |
| Grant date | Apr 25, 1995 |
| Priority date | — |
| Expiry date | Apr 28, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2383/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a method for the continuous preparation of heat-vulcanizing silicone rubber compounds. The method comprises continuous feeding of (A) 100 weight parts polydiorganosiloxane gum, (B) 5 to 100 weight parts reinforcing filler, and (C) up to 30 weight parts processing aid to a co-rotating twin-screw continuous compounding extruder. The components (A), (B), and (C) are continuously mixed in the extruder at a temperature in a range of about 200.degree. C. to 300.degree. C. The mixed components are then discharged, forming an extrudate. The extrudate is fed continuously to a counter-rotating twin-screw continuous compounding extruder, wherein the extrudate is continuously heat-treated at a temperature in a range of 150.degree. C. to 300.degree. C., forming the silicone rubber compound, which is then discharged from the counter-rotating twin-screw continuous compounding extruder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.