Compositions – Magnetic – With wax – bitumen – resin – or gum
Patent
1995-03-17
1997-03-11
Bonner, Melissa
Compositions
Magnetic
With wax, bitumen, resin, or gum
252 6253, 252 6255, 428900, 428692, 524339, 524440, 40426, 40449, 40600, 40621, 52DIG4, G09F 704
Patent
active
056097883
ABSTRACT:
Magnetic paint additives are formulated from ferromagnetic particles having a mixed particle range of from about 0.01.mu. to about 74.mu., preferably from about 0.01.mu. to about 37 to 44.mu.. Iron powder is preferred. Preferred additives are formulated by blending the particles with a surfactant or surfactant mixture, or a surfactant and alcohol mixture, in amounts sufficient to suspend the particles. The additive may be blended with any oil-, latex-, or lacquer-based paint or coating to form a magnetic paint or coating having a viscosity substantially similar to the paint containing no particles and/or additive. Some embodiments employ from about 500 to about 2000 grams of particles per gallon of paint. One preferred additive embodiment comprises 2 to 3 parts 6 to 9 micron iron powder and 1 part surfactant. Surfaces such as wood, wall board, sheet rock, foam, plywood, plastic, fiberboard and the like so coated may be cut with conventional woodworking tools to form magnetic signs.
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