Abstract: The process comprises the following phases: formation of a pre-emulsion of monomers in water; transfer into the polymerisation reactor with stirring, of (1) reaction stock consisting of a water solution of a surfactant, in an amount by weight relative to the weight of final polymer dispersion of 1–15%; (2) a portion of the pre-emulsion prepared in the previous phase, in an amount of 1%–10% by weight of the initial pre-emulsion; phase C.1: initiation of the polymerisation ; phase C.2: polymerisation of the monomer mixture at 30–90° C., by gradually adding into the reactor, separately, the initiator solution and the remaining portion of the pre-emulsion with an added salt, which is soluble in water at 25° C. to at least 1% by weight, in an amount so as to have a salt concentration in the added pre-emulsion of 0.02–0.25% by weight; phase C.3: scrubbing of the residual monomers.

Abstract: Processes for the preparation of adherent polyvinylidene fluoride, hexafluoropropylene coatings on objects of glass, metal, stone, bricks, cementitious objects, mortar, title and the like without the need of primers or alloying polymers and open celled foams from polymers having a Tg below the freezing point of the aqueous phase of the latex (either emulsion or suspension) of their formation are disclosed.

Abstract: Processes for the preparation of adherent polyvinylidene fluoride, hexafluoropropylene coatings on objects and for the direct production of open celled foams from a polymer latex without a need for any blowing agent.

Abstract: The process comprises the following phases: formation of a pre-emulsion of monomers in water transfer into the polymerisation reactor with stirring, of (1) reaction stock consisting of a water solution of a surfactant, in an amount by weight relative to the weight of final polymer dispersion of 1-15%; (2) a portion of the pre-emulsion prepared in the previous phase, in an amount of 1%-10% by weight of the initial pre-emulsion; phase C.1: initiation of the polymerisation ; phase C.2: polymerisation of the monomer mixture at 30-90° C., by gradually adding into the reactor, separately, the initiator solution and the remaining portion of the pre-emulsion with an added salt, which is soluble in water at 25° C. to at least 1% by weight, in an amount so as to have a salt concentration in the added pre-emulsion of 0.02-0.25% by weight; phase C.3: scrubbing of the residual monomers.

Abstract: A process for obtaining an aqueous polymer dispersion comprising the following steps:—formation of a monomer preemulsion in water by using surfactants;—transfer into the reactor of the basic charge containing a surfactant solution and a part of the preemulsion;—step C.1 polymerization start;—step C.2 polymerization of the monomeric mixture;—step C.3 removal of the residual monomers; wherein: A) from the start and up to a time in the range from −40% to +20% with respect to the instant wherein the polydispersity index of the particle sizes increases, the preemulsion is fed and the surfactant concentration in the reactor is not higher than 0.7% by weight; B) subsequently and till the polymerisation end, the remaining part of preemulsion is fed and the surfactant concentration in the dispersion is higher than that in step A) but lower than 5% by weight with respect to the dispersion weight.

Abstract: Processes for the preparation of adherent polyvinylidene fluoride, hexafluoropropylene coatings on objects and for the direct production of open celled foams from a polymer latex without a need for any blowing agent.