Iron oxide particles
US5922464A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1997 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Aug 8, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2993
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A rubber or resin composition comprises: PA1 0.1 to 10.0 parts by weight of iron oxide particles composed of iron oxide core which contains 0.21 to 2.14 wt % of silicon, calculated as SiO.sub.2, and 0.01 to 10.0 wt %, calculated as SiO.sub.2, of a precipitate composed of silicon, which adheres to the surfaces of said iron oxide core, a sphere ratio, maximum diameter/ minimum diameter, of said iron oxide particles being of 0.7 to 1.0, an average particle diameter of said iron oxide particles being 0.05 to 1.0 .mu.m, a geometric standard deviation .sigma.g of said iron oxide particles which shows the particle size distribution being not more than 1.40, a bulk density of said iron oxide particles being 0.80 to 1.5 g/cm.sup.3, and a surface activity of said iron oxide particles which is indicated by the number of cyclohexanone molecules adsorbed to the surfaces of the iron oxide particles, number of molecules/nm.sup.2, being not more than 1.70; and PA1 90 to 99.9 parts by weight of rubber or thermoplastic resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.