Abstract: Granules containing feed additives for ruminants are coated with an enzymatically degradable composition, consisting of: zein in combination with a non-water-soluble polymer and optionally a plasticizing agent, or zein in combination with a hydrophobic substance and optionally a non-water-soluble polymer.

Abstract: A basic copolymer of styrene with vinylpyridine is purified by extraction with supercritical carbon dioxide to remove residual monomers.

Abstract: A composition for coating a biologically active substance, which is stable in a medium with a pH greater than or equal to 5 and which enables the active substance to be released in a medium with a pH less than or equal to 3.5, consisting of a basic amino copolymer (preferably vinyl-pyridine/styrene copolymer) and a hydrophobic substance with a melting point greater than 60.degree. C. (preferably stearic acid), the hydrophobic substance content being between 50 and 90% of the total mass of the coating, and granules comprising a nucleous containing the biologically active substance, coated with this composition.

Abstract: Composition for feeding ruminants, containing a water-soluble biologically active substance which is stable in a medium whose pH is greater than or equal to 5 and which permits the release of the active substance in a medium whose pH is less than 3.5, comprising:a core containing the active substance, which has optionally undergone a surface treatment,a first coating layer consisting of a film-forming substance sensitive to pH variations, optionally in combination with an inorganic filler, anda second coating layer consisting of a hydrophobic substance, optionally in combination with an inorganic filler.

Abstract: A new process of adhesive-coating which makes it possible to increase the adhesion of glass fibers to rubbers based on natural rubber. The fibers are impregnated by means of a composition consisting or consisting essentially of a solution containing a resorcinol/formaldehyde resin, a natural latex, a latex based on vinylpyridine and, preferably, ammonium hydroxide, and while passing through the coating bath they are subjected to vibratory movements communicated directly to the fibers. The glass fibers adhesive-coated in this way are of great interest to the rubber industry in the manufacture of tires, conveyors, conveyor belts, hoses and the like.

Abstract: The present invention relates to an adhesive-coating composition for increasing the adhesion of heat-stable, high-modulus, modal, polyester-based yarns and glass fibres towards compounded rubbers based on natural rubber and on synthetic rubber, said composition comprising a solution of a precondensed resorcinol/formaldehyde resin, a latex based on vinylpyridine and polychloroprene latex, 28% strength ammonium hydroxide and a dicarboxylated butadiene/styrene resin. Yarns and fibres coated with the adhesive-coating composition of the invention are useful in the manufacture of tires, conveyors, conveyor belts, hoses and the like.

Abstract: A size composition is described which is capable of increasing the adherence, and particularly the adherence to rubber, of multifilament yarns having a base of polyester, a base of polymers of high modulus of elasticity, or a base of thermostable polymers, wherein said size composition contains tris(epoxypropoxy 2,3)3-propionyl 1,3,5-hexahydro-s-triazine as preadhering agent, preferably present in an amount between 1 and 30% based on the weight of the size composition. The treated yarn is thereafter bonded to a desired substrate, such as rubber.