Rumen-stable pellets

Claim 1

Method of preparing a composition adapted for use in coating pellets orally administrable to a ruminant which protects the core material in the rumen and releases it in the abomasum, said composition comprising (a) from about 16 to about 87% based on the total composition weight of a film-forming polymeric material comprising a polymer, copolymer or mixture thereof, said polymeric material having basic amino groups the nitrogen content of which constitutes between about 2 and about 14% by weight, of the polymeric material, (b) from about 0.5 to about 32%, based on the total composition weight of a hydrophobic material dispersed in said polymeric material selected from the group consisting of waxes, resins, polymers, fatty acids having from 12 to 32 carbon atoms, aluminum salts of fatty acids having from 12 to 32 carbon atoms and polyfunctional carboxylic acids having a ratio of from 10 to 22 carbon atoms per carboxyl group, and (c) from about 7 to about 80%, based on the total composition weight, of a physiologically acceptable flake material dispersed in said polymeric material, said method comprising first mixing said hydrophobic material and said flake material, causing the particles of flake material to come into rubbing contact with said hydrophobic material so that the surface of the particles of flake material become hydrophobic and subsequently blending the resulting mixture of hydrophobic material and flake material with said polymeric material to form said composition.