Abstract: The present invention relates to a film (A) consisting of a mixture comprising at least one polyamide and at least one polyolefin, the said film being placed on agricultural land into which a fumigant is injected. According to a first variant, the invention also relates to a film comprising the above layer (A) and a layer (B) consisting essentially of a polyolefin. According to a second variant, the invention also relates to a film comprising the above layer (A) placed between two layers (B). A coextrusion binder may optionally be placed between the layers (A) and (B) in the two variants. The invention also relates to a process for the treatment of soils by fumigation.

Abstract: The invention relates to a packaging comprising a thermoplastic film based on a polymer containing polyamide blocks and polyether blocks, said polymer being permeable to water vapor, to ethylene, to CO.sub.2 and to oxygen, such that the permeability to CO.sub.2 is very much greater than the permeability to oxygen. The invention is particularly useful for making sachets in order to conserve fresh fruit, vegetables or meat.

Abstract: The process for the manufacture of (co)polymer powders by aqueous suspension polymerization of at least one monomer which is polymerizable in suspension is conducted in the presence of at least one free-radical generator as catalyst, of at least one dispersing agent and, in addition, of at least one inhibitor scavenging free radicals of at least one complexing agent.

Abstract: A novel bis(mono- or diperoxyoxalate) composition of Structure A, ##STR1## and use of the novel bis(mono- or diperoxyoxalate) composition as an initiators for curing of unsaturated polyester resins and for polymerizing ethylenically unsaturated monomers are disclosed.

Abstract: A multifunctional anionic polymerization initiator which is in the form of a star-shaped polymer, and which is soluble in a nonpolar medium and is substantially free of residual double bonds. The initiator is denoted by the general formula (PA).sub.a N.sup.n- nLi.sup.+. PA is a polymer block of a vinylaromatic or diene monomer A. The variable "a" is the number of branches in the block PA. N is a crosslinked core comprising no or practically no residual double bonds and has the formula (PMc)(RLi).sub.p. Mc is a monomer containing at least two polymerizable double bonds per molecule. PMc is a crosslinked core of at least one polymerized monomer Mc, containing 3 to 30% of residual double bonds in relation to the initial double bonds originating from the monomer Mc. R is an alkyl, aryl, arylalkyl, alkylaryl, cycloalkyl, or alkenyl. The variable "p" is the number of residual double bonds in PMc which are neutralized by RLi. The variable "n" is the number of anionic sites present in the crosslinked core N.

Abstract: The invention relates to a mixture in powder form and comprising (i) at least one polyamide and (ii) at least one polymer (A) containing hydroxyl functional groups and compatible with the polyamide. The polymer (A) may be an ethylene/vinyl alcohol copolymer. The mixture may be used to coat metal substrates.

Abstract: The invention relates to belts made of thermoplastic polymer (A) and comprising a sufficient amount of a polymer (B) to render them antistatic, the said polymer (B) comprising polyethylene glycol blocks. Use is advantageously made of polymers (A) containing polyamide-6 (PA-6) or polyamide-12 (PA-12) blocks and polytetramethylene glycol blocks and polymers (B) containing PA-6 or PA-12 blocks and polyethylene glycol blocks.

Abstract: Use of at least one heteropolyacid H.sub.n A.sub.a D.sub.c O.sub.y.xH.sub.2 O where A is phosphorus, boron, silicon, germanium, tin, arsenic, antimony, copper, nickel, cobalt, iron, cerium, thorium, chromium and mixtures thereof; D is molybdenum, tungsten, vanadium and combinations thereof; a is 0.1-10; c is 6-18; n is the number of acidic hydrogens in the heteropolyacid and is a number above 1; y is the number of oxygens in the heteropolyacid and is a number of 10-70; and x is the number of moles of water of crystal-lisation and is a number of 0-40, as catalyst in the preparation of esters of unsaturated carboxylic acids by direct esterification of acids with alcohols or by transesterification, these reactions being carried out in the liquid phase.

Abstract: The present invention relates to firefighting foam concentrates including a protein hydrolysate in association with:(a) at least one fluorinated cotelomer which has a perfluoroalkyl radical and a polymerized chain consisting of units of an anionic hydrophilic monomer and of a nonionic hydrophilic monomer, and(b) at least one fluorinated surface-active agent whose aqueous solution at a concentration 1 g/l has at 20.degree. C. a surface tension lower than 25 mN/m.These film-forming emulsifiers are effective both against hydrocarbon fires and against polar-liquid fires.

Abstract: This invention relates to dicyclopentyl-oxyethyl methacrylate acrylic copolymer latices forming photocurable coalesced films and prepared by adding a photoinitiator to the latex, and which are useful for preparing lacquers and paints, particularly for building facades.

Abstract: Improvements in the retardation of water evaporation from benzyl alcohol containing water-in-oil emulsions by incorporating in the organic phase thereof an effective amount of a terpene.

Abstract: Aqueous paint stripper formulations containing a solvent system comprised of an ester such as benzyl formate and methods for using the same to strip paint.

Abstract: Ceramic preforms comprising monocrystalline hexagonal platelets of .alpha.-alumina, well adopted for conversion into refractory bricks or ceramic composites, are prepared by crystallizing a settled fine powder of amorphous alumina, transition alumina or alumina hydrate, advantageously in the presence of a fluoro-compound flux, into a coherent mass of such hexagonal platelets of .alpha.-alumina.

Abstract: A lithographic printing ink contains an ester-modified carboxyl-containing copolymer as a pigment dispersant. The ester-modified carboxyl-containing copolymer is the reaction product of a long chain alcohol and a styrene maleic anhydride copolymer, wherein at least 35% of the carboxyl groups of the styrene maleic anhydride copolymer are esterified. The ink further includes a solvent selected from the group consisting of aliphatic hydrocarbons, aromatic hydrocarbons, and mixtures thereof; a modifying oil; a liquid carrier resin; and a pigment.

Abstract: A process for the fluorination of 1230za is provided, wherein 1230za is contacted with HF in the gas phase in the presence of an aluminum fluoride or chromium-based fluorination catalyst under conditions sufficient to produce a reaction mixture containing 1233zd, 1234ze and 245fa. 245fa is a known foam blowing agent and refrigerant, while 1233zd and 1234ze are known intermediates useful for preparing 245fa.

Abstract: This process is characterized in that at least one of the said monomers is polymerized or copolymerized in bulk, solution, emulsion or suspension, at a temperature which may be as low as 0.degree. C., in the presence of an initiator system comprising at least one non-peroxy radical-generator compound and at least one catalyst consisting of a metal complex represented by formula Ma.sub.a (L).sub.n in which M represents Rh, Co or Ir; A represents, a halogen or a pseudohalogen; the groups L, which may be identical or different, each represent a ligand which may be a chiral ligand, which is chosen from cyclooctadiene, PRR'R", P(OR) (OR') (OR"), NRR'R", ORR', SRR', SeRR', AsRR'R", SbRR'R", each radical R, R' and R" independently representing an optionally substituted C.sub.1 -C.sub.14 alkyl group or an optionally substituted aromatic group, it being possible for at least two of these ligands to be joined together by one or more divalent radicals; a is an integer such that 1.ltoreq.a.ltoreq.

Abstract: The process consists in the agglomeration of fine particles of superabsorbent polymer, carried out by introducing an aqueous solution of monomer into a slurry of aqueous polymer dispersed within a hydrocarbon liquid, this introduction being performed directly at the temperature and in conditions of polymerization of the monomer. A superabsorbent product is thus obtained in a very good yield, in the form of aggregates of particles such that the fraction passing through a 100-micron screen is less than 1%.

Abstract: A laminate is provided comprising a) a non-woven based on fibers obtained from a mixture of a polyolefin and an ethylene copolymer; and (b) a thermoplastic film comprising a thermoplastic polymer and an ethylene copolymer.

Abstract: The present invention relates to thermoplastic polyamides and to thermoplastic elastomers based on polyamide with improved thermomechanical performance. They are obtained by grafting along the polymer chain with alkoxysilanes having at least one unsaturation, and especially vinyltrialkoxysilanes of formula CH.sub.2 .dbd.CH--Si--(OR).sub.3 where R represents an alkyl or an alkoxy-substituted alkyl group. The weight ratio of the silane to polyamide in the grafted polymer is generally between 0.1 and 5%. These grafted polyamides may be crosslinked by hydrolysis in steam at 100.degree. C. or by contact with water. The grafted and optionally crosslinked polyamides may be used for producing molded or extruded articles, such as tubes, jackets, single-layer and multilayer films and complex parts, and powder for coating substrates.

Abstract: A compound (Ia) or (Ib) is prepared by reacting, in a polar aprotic solvent, a compound (III) with a salt of a carboxylic or dicarboxylic acid (IIa) or (IIb). The reaction may be carried out under pressure, but also at normal atmospheric pressure or in the region of normal atmospheric pressure (especially between 0.10 bar and 2 bars). The product (Ia) or (Ib) formed is, in this latter case, recovered continuously as it is formed. ##STR1## R.sup.1, R.sup.2 =optionally substituted saturated or unsaturated acyclic or cyclic hydrocarbon radicals; R.sup.3 =C.sub.1 -C.sub.10 perhaloalkyl; 0<n.ltoreq.4; X=halogen.The applications of the fluoroalkyl (meth)acrylates obtained are especially: anti-dust or anti-soiling paints for various supports such as exterior coatings and metal furniture; optical fibers; contact lenses; lithography; electrophotography; heat-resistant materials; dental resins.