Sulfur vulcanizable rubber containing sodium thiosulfate pentahydrate
US5616655A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1995 |
| Grant date | Apr 1, 1997 |
| Priority date | — |
| Expiry date | Sep 11, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/548
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method is disclosed for processing a rubber composition comprising thermomechanically mixing at a rubber temperature in a range of 140.degree. C. to 190.degree. C. for a mixing time of 1 to 20 minutes PA1 (i) 100 parts by weight of at least one sulfur vulcanizable elastomer selected from conjugated diene homopolymers and copolymers, natural rubber and copolymers of at least one conjugated diene and aromatic vinyl compound; PA1 (ii) 10 to 250 phr of particulate precipitated silica; PA1 (iii) 0.01 to 1.0 parts by weight per weight of said silica of an organosilicon compound; and PA1 (iv) 0.05 to 10 phr of sodium thiosulfate pentahydrate. Addition of the sodium thiosulfate pentahydrate to sulfur vulcanizable rubber, silica and sulfur containing organosilicon compound decreases the mixing/processing time without sacrificing end product properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.