This invention relates to a composition of matter and to a method for producing a controllable, residue-free break of an emulsion or a dispersion of a water-in-oil emulsion. An emulsion breaker is incorporated into the emulsion. It is temporarily-protected (deactivated) so that breaking of the emulsion is initially avoided. By removing the protection, the breaker becomes active, and it acts to break the emulsion into its separate phases.

There is disclosed an emulsion composition which comprises an aqueous emulsion (A) obtained by emulsion polymerization of 100 parts by weight of an ethylenically unsaturated monomer in the presence of 1 to 15 parts by weight of a carboxyl group-modified polyvinyl alcohol such as itaconic acid-modified polyvinyl alcohol as the dispersant and a polyamide resin (B) such as polyamide epichlorohydrin. The above emulsion composition has a long pot-life and can easily be made into a film having a high ...

A method for preparing a bitumen emulsion which comprises forming the emulsion from bitumen, water, emulsifying agent, inorganic acid and metal salt, said metal being selected from lithium, sodium, potassium, magnesium, calcium and aluminum wherein the bitumen emulsion has a viscosity of at least 200 cst at 25.degree. C., by the steps of: (a) feeding the bitumen into a first static mixer at a temperature above 50.degree. C.; (b) introducing part of the water under pressure into the first static ...

Vinyl C.sub.1 to C.sub.3 alkanoate/C.sub.2 to C.sub.4 alkylene copolymer emulsions e.g. vinyl acetate/ethylene, are usable as wet adhesives and pressure sensitive adhesives for a number of applications. Their bonding to the surfaces of lower polarity, e.g. polyethylene, is improved by including vinyl esters of C.sub.4 to C.sub.18 primary carboxylic acids as a monomer.

A copolymer emulsion suitable for use as a sizing agent for glass fibre is formed by microfluidising an emulsion containing at least 90% by weight of C1 to C10 alkyl(meth)acrylate monomer and stabilised by a protective colloid, e.g. polyvinyl alcohol, prior to initiation by the polymerisation reaction.

A cure stable polyester emulsion for use in an aqueous size composition has been developed for glass fibers produced for molded products having appearance surfaces known as Class A surfaces. The size contains a cure stable polyester emulsion and a static insensitive lubricant system. The resulting coated glass fibers are especially useful in improving processability and product uniformity of SMC applications.

The viscosity of an asphalt emulsion may be controlled by incorporating up to about 1 percent by weight of a modified starch containing not more than 27 percent amylose and the balance substantially amylopectin.

An adhesive composition based on a polyvinyl acetate emulsion for bonding wood and other porous substrates, which contains lecithin as a built-in lubricant. Lecithin in this adhesive composition assists in release of the adhesive from the press platen, etc. in the manufacture of plywood or other products.

An apparatus and method for resolving an emulsion that has an aqueous phase and an organic phase that includes components capable of polymerizing or coagulating. The emulsion is added to a tank and heated (with gentle agitation to avoid formation of hot spots) to a temperature sufficient to prevent it from setting up inside the tank. A non-corrosive inorganic separation aid incapable of initiating polymerization of the emulsion or its constituents is added to the tank with mixing to cause the em...

Stable emulsions and dispersions of both the water-in-oil and oil-in-water types are prepared by subjecting mixtures of the two phases to shear stress in the presence of nitrile group-containing copolymers capable of forming hydrogels containing at least 90% by weight of water at room temperature.