Compositions – Heat-exchange – low-freezing or pour point – or high boiling... – Organic components
Patent
1989-04-21
1991-02-12
Lieberman, Paul
Compositions
Heat-exchange, low-freezing or pour point, or high boiling...
Organic components
252 781, 252 79, 252572, 524504, 524533, 524853, 525291, 525285, 525301, 525308, 525317, C10M16904, C09K 300
Patent
active
049921924
ABSTRACT:
Disclosed are electrorheological (ER) fluids which display improved stability against sedimentation, reduced current density and good ER responses. Thes=e ER fluids are prepared from monomers which are polymerized by dispersion polymerization in a low conductivity medium which also serves as the dispersion medium for the fluid. The ER fluids are further processed by modifying the polymer particles through polymerization of a hydrophilic monomer to form a hydrophilic shell or globule around the particles followed by neutralization through addition of an organic soluble base. The resulting dispersion is then doped with water to obtain a stable ER fluid. The hydrophilic shell or globule constitutes about 15% of the particle. Water dopant is only absorbed by the hydrophilic portion of the particle and does not enter into the core of the particle. The quantity of water is significantly reduced, which in turn results in a significant reduction of the current density at any given comparative voltage.
REFERENCES:
patent: 3047507 (1962-07-01), Winslow
patent: 3367872 (1968-02-01), Martinek et al.
patent: 3412031 (1968-11-01), Martinek et al.
patent: 3950284 (1976-04-01), Fukuda et al.
patent: 4033892 (1977-07-01), Stangroom
patent: 4129513 (1978-12-01), Stangroom
patent: 4315085 (1982-02-01), Ozari et al.
patent: 4420596 (1983-12-01), Lochhead et al.
patent: 4427820 (1984-01-01), Backhouse et al.
patent: 4502973 (1985-03-01), Stangroom
patent: 4533695 (1985-08-01), Theodore et al.
patent: 4772407 (1988-09-01), Carlson
Goldberg Mark
Hercules Incorporated
Lieberman Paul
Patterson Joanne W.
Skane Christine A.
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