Surface modification of alumina hydrate with liquid fatty acids
AssigneeAluminum Company of America
InventorPatrick V. Bonsignore
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Abstract
A surface modified alumina hydrate composition compatible with thermoplastic resins when used as a flame retardant and smoke suppressing filler. Surface modification is accomplished by treating powdered alumina hydrate with about 0.2 to 5 percent by weight of a liquid mixture of C.sub.10 -C.sub.20 carboxylic acids having a titer below about 30.degree. C. and an iodine value of about 15 or less. In a preferred embodiment, the alumina hydrate has a particle size of less than about two microns, and the liquid mixture of acids comprises isostearic acid.
Claims15
A surface modified alumina hydrate composition compatible with thermoplastic resins, said composition comprising
- powdered alumina hydrate having an average particle size of less than about 15 microns, and
- about 0.2 to 5 percent, based on the weight of the alumina hydrate, of a liquid mixture of C.sub.10 -C.sub.20 carboxylic acids, said mixture having a titer below about 30.degree. C. and an iodine value of about 15 or less.
An improved method for dispersing powdered alumina hydrate having an average particle size of less than about 15 microns in a thermoplastic resin, said method comprising the steps of
- modifying the surface characteristics of the hydrate by mixing the hydrate with 0.2 to 5 percent by weight of a mixture of C.sub.10 -C.sub.20 carboxylic acids, said mixture having a titer below about 30.degree. C. and an iodine value of about 15 or less, thereby to form a surface modified hydrate composition, and
- admixing up to 65 percent of the hydrate composition, based on total weight of the hydrate composition and resin, in a thermoplastic resin.
Dependencies are inferred from the claim text.