Abstract: Semi-aromatic copolyamides and copolyester-amides are obtained by placing an aliphatic polyamide into contact with an aromatic hydroxyacid or aminoacid, by operating at high temperature, under melting conditions, possibly in the presence of a catalyst, with a ratio of the monomer units of aliphatic polyamide to the mols of aromatic hydroxyacid or aminoacid comprised within the range of from 20:1 to 1:1.The semiaromatic copolyamides and copolyester-amides so obtained can display a thermotropic liquid-crystal behaviour as a function of their content of aromatic units linked inside the molecular chain. Their elastic modulus results to be improved relatively to the alifatic polyamides used as the starting product, and the elongation at break results to be decreased.Such semiaromatic polyamides and copolyester-amides can find application in the production of high-stiffness articles, by means of moulding or extrusion processes.

Abstract: A solid polymeric electrolyte is constituted by a solid solution of an ionic compound in an organic matrix of polyether nature, constituted by a mixture consisting of:a high-molecular-weight poly-(ethylene oxide); andthe product of polymerization of a vinylether having the formula:R--(O--CH.sub.2 --CH.sub.2).sub.n --O--CH.dbd.CH.sub.2wherein:R means the methyl or ethyl radical; andn is an integer within the range of from 2 to 6,with said polyvinylether having a number average molecular weight within the range of from about 1,000 to about 10,000 and the weight ratio of said poly(ethylene oxide) to said polyvinylether being within the range of from 10:90 to 90:10.

Abstract: Storage-stable, pumpable, concentrated dispersions of coal in water contain a non-ionic additive constituted by a polymer containing polyethoxy chains grafted onto suitably functionalized polystyrenes having a molecular weight comprised within the range of from 500 to 15000.

Abstract: A modified poly(2,6-dimethyl-p-oxyphenylene) with a glass transition temperature in the range of 180.degree.-220.degree. C. is described in which on the average between 10 and 60% of the macromolecules carry:a) an ##STR1## unit; or b) an ##STR2## unit. Said modified poly(2,6-dimethyl-p-oxyphenylene) is useful as a material in the preparation of flat membranes, in particular asymmetric membrane, for gas separation.

Abstract: A method is disclosed for the inhibition of general corrosion, and of stress corrosion by hydrogen sulfide in manganese and low-alloy, medium-strength and high strength steels, obtained by means of the use of compounds of formula:R.sub.1 --CH.dbd.N--[-(CH.sub.2).sub.n --N.dbd.CH--].sub.m --R.sub.

Abstract: Sterically hindered amino compounds definable by the general formula (I): ##STR1## where R represents a hydrogen atom, a C.sub.1 -C.sub.18 alkyl radical or a C.sub.7 -C.sub.18 alkaryl radical, are useful as organic polymer stabilizers. Processes for preparing these compounds are described.

Abstract: A thermotropic copolyester, showing a liquid-crystalline structure of nematic type within a desired temperature range, contains units deriving from:(a) a saturated bicarboxy aliphatic acid;(b) 4,4'-di-hydroxydipheryl;(c) 4-hydroxybenzoic acid; and(d) 4-hydroxy-benzoic acid bearing an alkyl substituent or a halogen atom bonded to the aromatic ring.Such a copolyester constitutes a material endowed with self-reinforcing characteristics, originating, through the usual transformation processes by injection or by extrusion techniques, marked molecular orientations, which supply the manufactured articles with high stiffness characteristics.Said material can be also used as a reinforcing agent when is mixed, by means of the usual techniques, with the traditional thermoplastic polymers.

Abstract: A thermotropic copolyester, having a liquid-crystallne mesophase of nematic structure within a desired range of temperatures, contains units derived from:(a) a saturated aliphatic bicarboxy acid;(b) 4,4'-dihydroxy-biphenyl;(c) p-hydroxybenzoic acid; and(d) 2,6-hydroxynaphthoic acid.Such a thermotropic copolyester displays improved characteristics, in particular as regards its extensional modulus and its tensile strength, when is used as a self-reinforced material, or as a reinforcer material for traditional thermoplastic polymers.

Abstract: Thermotropic copolyazomethines having a mesophase temperature range lying within a desired range of values are obtained by copolymerizing terephthalic aldehyde with at least two different 1,n-bis(4-aminophenoxy)alkanes.Such copolyazomethines are particularly useful as reinforcing materials for the usual thermoplastic polymers, such as polycarbonate, polybutyleneterephthalate, polyethyleneterephthalate and polyamides.

Abstract: A solid polymeric electrolyte is constituted by a solid solution of an ionic compound in a cross-linked polyether, wherein this latter is the copolymerization product of a vinyl-ether of formula:R--(O--CH.sub.2 --CH.sub.2).sub.n --O--CH.dbd.CH.sub.2 (I)wherein:R is the methyl or ehtyl radical; andn is an integer comprised within the range of from 1 to 16; with a di-vinyl-ether of formula:CH.sub.2 .dbd.CH--(O--CH.sub.2 --CH.sub.2).sub.m --O--CH.dbd.CH.sub.2(II)wherein:m is an integer comprised within the range of from 1 to 16; with a molar ratio of the di-vinyl-ether (II) to the vinyl-ether (I) comprised within the range of from 1/100 to 10/100; with said polyether having a weight average molecular weight of about 10,000, and a glass transition temperature (T.sub.g) comprised within the range of from --60.degree. C. to --80.degree. C.Such a solid polymeric electrolyte is used in the manufacturing of high-energy-density electrochemical generators.

Abstract: Polymeric stabilizer compounds are formed by an organic polymeric matrix, of paraffinic character, deriving from a hydrogenated polydiene and bearing bonded at at least one chain end a sterically hindered aminic function.Such polymeric stabilizer compounds are obtained by means of a process, which provides:(a) the polymerization of a diene, by the technique of the living polymers, under the influence of alkyl metal-alkyl or alkyl metal-aryl catalysts, to yield a polydiene bearing on its chain end a terminal metal atom;(b) the reaction of said metal-bearing polydiene with a sterically hindered aminic compound, bearing in its molecule an electrophilic group, in particular a carbonyl group, reactive towards said metal of the metal-bearing polydiene;(c) the catalytic hydrogenation of the polydiene bearing said sterically hindered aminic function at its chain end.The so-obtained compounds are particularly useful in the stabilization of polypropylene towards the U.V. light degrading action.

Abstract: A thermotropic copolyester, having a nematic structure of the liquid-crystalline phase within a desired range of mesophase temperature, contains units derived from a saturated aliphatic dicarboxylic acid, 4,4'-dihydroxy-biphenyl and p-hydroxybenzoic acid, in a mutual ratio of from 1:1:0.5 to 1:1:8.This thermotropic copolyester is produced by copolymerizing in the molten state a saturated aliphatic dicarboxylic acid, 4,4'-diacyloxybiphenyl and p-acyloxybenzoic acid.The use is disclosed of the thermotropic copolyester as a self-reinforced material, and as a reinforcer material for such traditional thermoplastic polymers as polybutylene terephthalate, polyethylene terephthalate, polycarbonate and nylon.

Abstract: Solid polymeric stabilizer compound containing the hydroxybenzophenone function, having the general formula (I): ##STR1## wherein: m=from 0.01 to 0.99 (preferably from 0.1 to 0.6);l=from 0.99 to 0.01 (preferably from 0.9 to 0.4):m+l=1;R=H, --OH, --OR" (R"+(C.sub.1 -C.sub.20)-alkyl; aryl, alkylaryl cycloalkyl). halogen, (C.sub.1 -C.sub.20)-alkyl, cycloalkyl;R'=H, (C.sub.1 -C.sub.20)-alkyl, cycloalkyl.Also the process for preparing said solid polymeric stabilizers and the stabilized polymeric compositions comprising at least an organic polymer and a stabilizing amount of said solid polymeric stabilizers are disclosed.

Abstract: Solid polymeric stabilizer compounds are disclosed comprising an organic polymeric matrix, to which are linked groups containing a sterically hindered aminic function, the organic polymeric matrix being a polymeric matrix of a vinyl-aromatic, aromatic with heteroatoms, dienic or olefinic polymer, containing hydrogen atoms replaceable by metal atoms, the groups containing the sterically hindered aminic function replacing, at least partially, said replaceable-by-metal hydrogen atoms of the matrix.Also disclosed are processes for the preparation of said solid polymeric stabilizers and stabilized polymeric compositions comprising an organic polymer and a stabilizing amount of said solid polymeric stabilizers.

Abstract: Coupling agents of general formula ##STR1## and their use in a method for the termination of living polymers obtained by the anionic polymerization of dienic and/or vinylaromatic monomers.

Abstract: Coupling agents of general formula ##STR1## and their use in a method for the termination of living polymers obtained by anionic polymerization of diene and/or vinylaromatic monomers.

Abstract: Coupling agents of general formula ##STR1## and their use in a method for the termination of living polymers obtained by the anionic polymerization of dienic and/or vinylaromatic monomers.

Abstract: Coupling agents of general formula ##STR1## and their use in a method for the termination of living polymers obtained by the anionic polymerization of dienic and/or vinylaromatic monomers.

Abstract: Coupling agents suitable to be synthetized by cyclo-oligomerization of 3-methylbutyn-1-ol-3 with subsequent dehydration of the alcohol compounds, and their use in a method for the termination of living polymers obtained by means of the anionic polymerization of diene and/or vinylaromatic monomers.

Abstract: Coupling agents of general formula ##STR1## and their use in a method for the termination of living polymers obtained by the anionic polymerization of dienic and/or vinylaromatic monomers.