Abstract: The invention concerns the use in a stabilizing composition for halogenated polymers, of at least a silylated compound of formula: (R1)4-x-Si[O—C(R2)=CH2-C(?O)(R3)]x, wherein R1, identical or different, represent an aliphatic or aromatic radical; said radicals being selected such that the silylated compound has a boiling point higher than at least 30° C. relative to the working temperature of said polymer; R3 represents an aliphatic radical R or a radical —OR1; R2, R and R1, identical or different, represent an aliphatic radical, linear or not, comprising 1 to 10 carbon atoms, or an aromatic radical, preferably comprising 6 carbon atoms, optionally substituted by at least an aliphatic radical comprising 1 to 10 carbon atoms; x is equal to 1 or 2.

Abstract: The invention concerns a compound containing calcium or magnesium acetylacetonate, at least partially coated with a compatible agent selected among alcohol's, carboxylic or sulphonic acids, or their derivatives, phosphates or titanates, &bgr;-ketone compounds; said agents having at least a long chain radical; waxes; polyols; epoxidized vegetable oils; polysiloxane oils or resins or silanes. The invention also concerns the preparation of such a compound and the use of said compound as additive in formulations based on halogenated polymers.

Abstract: The invention concerns the use, for increasing the durability of moulds made of silicone elastomer crosslinkable by a poly addition or polycondensation reaction, of additive capable of stabilizing the silicone elastomer constituting the mold with respect to materials to be molded, of an additive selected among: (a) antioxidant additives comprising, in their structure additives containing at least one R—Sq—R′ group in which R and R′ are monovalent hydrocarbon groups with at least 3 carbon atoms or a monovalent hydrocarbon group with an ester bond or R and R′ together form a cycle, q being a whole number between 1 and 3 inclusively, (b) additives inhibitors of free radicals capable, in moulding conditions of generating radicals ═N—O; the invention concerns the synergistic combination of (a)+(b), the synergistic combination of (a) and/or (b) with phosphites (c), except for the use of bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate as only additive in a silic

Abstract: The invention concerns a composition comprising calcium or magnesium acetylacetonate and at least a free &bgr;-diketone and/or in the form of a metal chelate, and having a melting point at most equal to 200° C. The invention also concerns the use of said composition for forming a formulation comprising at least a halogenated polymer, to prevent heterogeneity resulting from the presence of calcium or magnesium acetylacetonate, in said polymer.

Abstract: The present invention relates to multifunctionalized alkoxy, the alkoxy functionality Y being introduced onto a suitable polyhydroorganosiloxane by a dehydrogenation/condensation reaction from the alcohol from which Y derives and then the functionality W by a hydrosilylation reaction from the olefinic compound form which W derives. The multifunctionalized alkoxy polyorganosiloxanes can be used as antiadhesion modulators in silicone compositions and as silica covering agents in silicone compositions containing fillers.

Abstract: The present invention relates to multifunctionalized alkoxy, the alkoxy functionality Y being introduced onto a suitable polyhydrooorganosiloxane by a dehydrogenation/condensation reaction from the alcohol from which Y derives and then the functionality W by a hydrosilylation reaction from the olefinic compound from which W derives. The multifunctionalized alkoxy polyorganosiloxanes can be used as antiadhesion modulators in silicone compositions and as silica covering agents in silicone compositions containing fillers.

Abstract: The present invention is directed to compositions containing novel beta-diketones of formula (I) and formula (II),R.sub.1 COCH.sub.2 COR.sub.2 (I)R.sub.2 COCH.sub.2 COR.sub.2 (II)which may be used to stabilize various polymers, such as polyvinyl chlorides (PVCs). The present invention is also directed to a method for preparing .beta.-diketones by a Claisen condensation reaction, which is represented as follows:R.sub.4 COCHR.sub.5 H+R.sub.6 C(O)OR.sub.7 +RO.sup.- .fwdarw.?R.sub.4 COCR.sub.5 COR.sub.6 !-+R.sub.7 OH+ROH.

Abstract: Novel piperidyl organosiloxanes, well adapted for the light/UV-stabilization of a wide variety of polymer substrates, e.g.

Abstract: The invention relates to compositions for chlorine-containing polymer such as PVC, including a stabilizing composition.According to the invention the stabilizing composition includes:a) the unpurified crude product resulting from the reaction of condensation of an ester with a ketone in the presence of an alkaline agent, this crude product including between 10 and 95%, preferably between 20 and 80% by weight of beta-diketone, andb) a metal acetylacetonate complex,the ratio of the constituents a/b being between 50/50 and 1/99.The invention also relates to the standard objects obtained from these compositions.

Abstract: The present invention relates to a stabilizing composition for a chlorine-containing polymer (PVC), characterized in that it comprises the unpurified crude product resulting from the reaction of an ester with a ketone in the presence of an alkaline agent, this crude product comprising at least 10 % by weight of .beta.-diketone and being in the form of a powder.

Abstract: Novel piperidyl organosiloxanes, well adapted for the light/UV-stabilization of a wide variety of polymer substrates, e.g.

Abstract: The present invention is directed to compositions containing novel beta-diketones of formula (I) and formula (II),R.sub.1 COCH.sub.2 COR.sub.2 (I)R.sub.2 COCH.sub.2 COR.sub.2 (II)which may be used to stabilize various polymers, such as polyvinyl chlorides (PVCs). The present invention is also directed to a method for preparing .beta.-diketones by a Claisen condensation reaction, which is represented as follows:R.sub.4 COCHR.sub.5 H+R.sub.6 C(O)OR.sub.7 +RO.sup.- .fwdarw.[R.sub.4 COCR.sub.5 COR.sub.6 ]--+R.sub.7 OH+ROH.

Abstract: A preferred embodiment of a resonator embodying the invention comprises entially a resonating plate, an action electrode and a detection electrode, and a supporting base. The electrodes are placed facing symmetrical narrow edges of the plate, opposite vibration loops, and are coupled to the plate by capacitive, electrostrictive or piezoelectric effect according to the material of which the plate is comprised. A very wide range of elastic solid materials can be used to embody the resonating plate. The plate is attached to the supporting base at points corresponding to vibration nodes of the plate. The plate vibrates advantageously according to a contour mode called Lame mode. High coefficients of quality in the region of 10.sup.7 are obtained. The resonators embodying the invention can be easily integrated. To do so, the plate is e.g. embodied in silicon. Such a resonator is included in a high-stability oscillating loop comprising a phase shifter and an amplifier.

Abstract: The present invention relates to new hydroxybenzophenones containing an ester functional group and to the use of these compounds as UV absorbers in organic polymers. More precisely, the new hydroxybenzophenones are 1,3-di(4-benzoyl-3-hydroxyphenoxy)-2-propanol carboxylates which preferably have a molecular mass of at least 500.These benzophenones can be employed as anti-UV agents in organic polymers, either by themselves or jointly with known benzophenones of lower molecular mass, such as 2-hydroxy-4-alkoxybenzophenones.

Abstract: Disclosed is a method for the control of display screens that can be applied to internal memory type screens, notably plasma display panels for which it increases the dynamic range of the adjusting of the luminosity. This method consists in controlling the cells (C1 to C16) of the screen by means of addressing commands, each one of which comprises a selective command and a semi-selective command. According to one characteristic, for the addressing of one and the same line (L1 to L4) of cells (C1 to C16), the method consists in separating the selective command (CI) from the semi-selective command (CE) by an adjustable interval of time (PL1 to PL4).

Abstract: Polymer matrices, e.g., halogenated polymers such as PVC, polyolefins, polystyrenes, polyalkadienes, etc., are stabilized against the adverse effects of heat and light, by incorporating therein an effective stabilizing amount of a compound of the formula (I): ##STR1## in which n is a number ranging from 1 to 3, and R is a methyl radical or a hydrogen atom.

Abstract: Novel compositions for stabilizing chlorinated polymers, copolymers and homopolymers comprising dawsonite, an organotin .beta.-diketonate, an organic zinc compound, and an organic calcium, magnesium, barium or lanthanide compound are disclosed. The compositions of the present invention enable the content of epoxidized oils to be decreased in chlorinated polymers while preserving thermal stability.

Abstract: Novel dihydropyridine compounds bearing substituted piperidyl substituents are effective heat/light stabilizers for a wide variety of polymer substrates, e.g., for halopolymers such as PVC, and are also effective anti-UV agents and antioxidants for such polymers as polyolefins, polystyrenes, polyalkadienes, polyurethanes, polyamides, polyesters, polycarbonates, polysulfones, polyethersulfones, polyetherketones, acrylic polymers, or copolymers or mixtures thereof.

Abstract: Compounds containing a 2,2,6,6-tetramethylpiperidinyl group and a method of making them. The compounds are effective for the protection of organic polymers against degradation due to light and ultraviolet radiation.

Abstract: Linear and cyclic diorganopolysiloxanes containing benzotriazole functional groups are well suited for the coating of optical fibers and for lubricating plastics, e.g., PVC.