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US 4,221,697 AGranted
Composite materials
AssigneeImperial Chemical Industries PLC
InventorsPeter G. Osborn, Desmond W. J. Osmond, Barrie J. Thorpe
Life of this patent
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AssigneeImperial Chemical Industries PLC
InventorsPeter G. Osborn, Desmond W. J. Osmond, Barrie J. Thorpe
Estimating the term…
Stable, fluid, moldable and curable compositions are described from which may be fabricated composite materials, of improved mechanical properties, comprising an organic polymer matrix and a particulate inorganic reinforcing phase dispersed in and bonded to the matrix. The fluid compositions comprise (A) a polymerizable organic liquid having a viscosity not greater than 50 poise at the molding temperature, (B) inorganic filler particles of defined size constituting at least 20% by volume, and optionally up to 90% by volume, of the total composition, and (C) a defined polymeric dispersant whereby the filler particles are stably dispersed in the polymerizable liquid. The generally low viscosity of the curable compositions enables them to be cast by simple techniques and polymerization of the component (A) yields the above-described composite materials.
A stable, fluid, mouldable and curable composition comprising (A) an organic liquid which is polymerisable to form a solid polymer and has a viscosity not greater than 50 poise at the temperature at which the composition is to be moulded, (B) finely divided particles of one or more inorganic fillers having a maximum size of 100 microns, at least 95% by number of the particles being of a size 10 microns or less, and the surface area of the particles being from 20 m.sup.2 /cc to 1 m.sup.2 /cc, the said particles constituting from 35 to 85% by volume of the total composition, and (C) a polymeric dispersant containing at least one component of molecular weight at least 500 which is solvated by the polymerisable organic liquid (A), and containing one or more groupings which are capable of associating with, and effecting anchoring to, the particles of the inorganic filler (B) whereby the filler particles are maintained in a state of stably deflocculated dispersion in the polymerisable liquid.
Dependencies are inferred from the claim text.