Abstract: A process for the preparation of vinyl chloride homopolymer and copolymer pulverulent powders suitable for the preparation of plastisols with improved rheological properties, comprising polymerizing to form a vinyl chloride homopolymer or copolymer latex and drying said latex by atomization, the temperature at which the latex to be subjected to drying by atomization is employed being at least equal to 40.degree. C. and being lower than the degradation temperature of said homopolymer or copolymer, and the resultant vinyl chloride polymer pulverulent powders.

Abstract: The improvement in a process for the preparation of latexes of homo- and co-polymers of vinyl chloride, with particles having a mean diameter between 0.2 and 0.8 .mu.m and containing at least one organosoluble polymerization initiator, by polymerization in microsuspension of the corresponding monomer or monomers, according to which a fine dispersion of the monomer or monomers is formed in an aqueous medium containing at least one anionic emulsifying agent or at least one anionic emulsifying agent and at least one nonionic emulsifying agent, in the presence of 0.004 to 0.16% by weight; in relation to the weight of the monomer or monomers, of said initiator expressed as active oxygen and then the thus formed reaction medium is subjected to polymerization at the desired polymerization temperature (.theta..sub.1); the improvement comprising adding to the aqueous medium 2,6-ditert.

Abstract: A process for preparing vinyl chloride homopolymer or copolymer latexes, comprising carrying out the polymerization of a monomer composition in a reaction medium in emulsion or in microsuspension and continuously condensing a vapor fraction of said monomer composition and continuously refluxing said condensed vapor fraction into said reaction medium, degassing the resultant polymer, and carrying out the polymerization under agitation by means of a paddle agitator with a rotating shaft having at least one paddle and at least one deflector with the speed gredient between said at least one paddle and said at least one deflector being between 5 and 50 s.sup.-1 ; the peripheral rotational speed of the agitator is maintained in the range of about 1.1 to 2.1 meters/second for about 50% to 100% of the duration of the polymerization period preceding the beginning of reflux (P.sub.1) and the period which separates the end of reflux from the beginning of degassing (P.sub.3), and at a speed in the range of about 0.

Abstract: A process for the preparation of a vinyl chloride polymer latex having particles with a mean diameter between about 0.2 and 0.8 .mu.m and containing at least one organosoluble polymerization initiator comprising dispersing in an aqueous reaction medium also containing parabenzoquinone, at least one monomer, at least one anionic emulsifier and optionally at least one nonionic emulsifier, and from about 0.004 to 0.16% by weight, with respect to said at least one monomer, of said initiator expressed in terms of active oxygen, polymerizing said at least one monomer at a desired polymerization temperature, .theta..sub.1, and continuously adding parabenzoquinone to said aqueous reaction medium during the polymerization when the temperature .theta..sub.2 of the reaction medium is such that the difference .theta..sub.2 -.theta..sub.1 exceeds a value from 0.degree. to +5.degree. C.

Abstract: Novel lubricating oil polymer additives are obtained by the following:(1) by preparing, by anionic polymerization, a living diene polymer of an Mn of between about 20,000 and 300,000;(2) by functionalizing the said polymer by means of a non-polymerizable nitrogen compound having at least two <C--N=C> groups, such as the polypyridines, pyrimidine and its derivatives, pyrazine and its derivatives, 2,4,6-tri-(2-pyridyl)-1,3,5-triazine, dipyridyl sulfide, etc.; and(3) by hydrogenating the said functionalized polymer.A variant method of preparaing the said polymers comprises metalating the living polymer before functionalization; in accordance with this variant, the hydrogenation operation may take place before metalation or after functionalization.The said polymers can be used as additives which improve the viscosity index and the dispersing power of the lubricating oils. The amount of additive added is between about 0.1 and 10 percent by weight.

Abstract: Novel lubricating oil polymer additives are obtained by the following:(1) by preparing, by anionic polymerization, a living diene polymer of Mn of between about 20,000 and 300,000;(2) by functionalizing the said polymer by means of an N-substituted lactam of the type of N-alkylcaprolactam, N-binylcaprolactam, and particularly of the type of N-alkylpyrrolidione and N-vinylpyrrolidone; and(3) by hydrogenating the said functionalized polymer.A variant method of preparing the said polymers comprises subjecting the living polymer to a metalation operation before functionalization; the hydrogenation operation is carried out before metalation or after functionalization.The said polymers may be used as additives which improve the viscosity index and the dispersing power of lubricating oils. The amount of additive added is between about 0.1 and 10 percent by weight.

Abstract: Fireproof laminations for electric or electronic devices are comprised of a cellulosic substrate impregnated with a phenolic resin, further incorporating a fireproofing-effective quantity of encapsulated red phosphorus particulates.