摘要:
The invention concerns the use of an efficient amount of a polyfunctional coupling system (A) as inorganic-elastomer filler coupling agent in rubber compositions including: (B) at least one elastomer such as natural or synthetic rubber; (C) an inorganic filler as reinforcing filler; (D) all or part of the constituents or additives normally used including in particular one (or more) vulcanizing agent(s). Said use is characterized in that: the polyfunctional coupling system consists in combining the following ingredients (A1) and (A2): (A1) is at least one coupling agent selected among the functionalized organosilicium compounds of following formula (I): [(G0)3SiO1/2]m [(G0)2SiO2/2]n [G0SiO3/2]o [SiO4/2]p [(G2)a(G1)a'(Z-CO-N=N-CO-A )SiO(3-a-a')/2]q, wherein the symbols Z, A, G0, G1, G2, a, a', m, n, o, p and q are such as defined in Claim 1; (A2) is at least one coupling agent selected among either polysulphurated 'symmetric' silanes, or sulphurated 'asymmetric' silanes; said polyfunctional coupling system (A) is incorporated in isoprene elastomer-based rubber compositions.
摘要:
The invention relates to adhesive silicon elastomer compositions which can be cross-linked by polyaddition. More specifically, the invention relates to the development of a single-component self-adhesive silicon elastomer. The inventive adhesive silicon elastomer composition which can be heat cross-linked by polyaddition (hydrosilylation) is of the type that comprises: α/ at least one polyorganosiloxane (POS) bearing ethylenic and/or acetylenic unsaturation(s), {POS with units =Si-[unsaturation]}; β/ at least one polyorganosiloxane (POS) bearing units =Si-H; η/ a catalytic assembly containing η.1 at least one metallic catalyst (preferably platinum based), η.2 and at least one cross-linking inhibitor; δ/ a filler; ε/ at least one adhesion promoter; ς/ at least one POS resin; μ/ at least one thermal resistance agent; and ?/ optionally at least one other functional additive. The invention also relates to the use of said adhesive silicon elastomer composition as a glue and/or in the production of joints.
摘要:
The invention concerns the use as catalyst for hydrosilylation of at least an unsaturated reagent (A) with at least a silicone monomer, oligomer or polymer (B) having, per molecule, at least a SiH reactive unit, in the presence of a homogeneous catalytic system comprising (i) a platinum group metal, preferably complex-catalyzed, and (ii) a heterocyclic organic compound such as lactone.
摘要:
The invention concerns a silicone composition crosslinkable into elastomer by hydrosilylation, in the presence of carbene-based metal catalysts. The invention aims at providing a composition of that type, stable over long periods at room temperature (one day to several months), without loss of its characteristic of being heat-curable by hydrosilylation and without generating secondary isomerization or colouring reactions. The invention is characterised in that the composition comprises: a polyorganovinylsiloxane (polydimethyl)(methylvinyl) siloxane; a polyorganohydrogenosiloxane; a platinum catalyst formed by a complex of formula C3 and optionally an acetylene crosslinking inhibitor; optionally a siliceous filler. The invention also concerns novel hydrosilylation catalysts of the metal complex type of formula C3 above. The life span of the potted single-constituent compositions of the invention is significantly increased.
摘要:
The invention relates to metal complexes of formula (I), wherein M, X, Y1, Y2, R1, R2, R5 and R6 have the meanings given in claim 1. These complexes are particularly suitable for use as catalysts of hydrosilylation reactions.
摘要:
The invention concerns a method for preparing catalytic assemblies by mixing a metal catalyst capable of catalyzing a hydrosylilation reaction and an organo-phosphorus inhibitor of formula (I) or of formula (VIII) P(OR)3, either by mixing the inhibitor in a catalyst solution in an unsaturated silane or siloxane, or by mixing the inhibitor in a gum or oil, at a temperature higher than the melting or softening point of the organo-phosphorus compound, then in mixing the catalyst. The invention also concerns catalytic assemblies, a method for preparing single-constituent silicone compositions and the resulting compositions.
摘要:
The invention concerns an improved method for preparing catalysts for hydrosilylation reactions of compounds with ethylene or acetylene unsaturation (for example olefins or acetylene derivatives), in particular but not exclusively those involving polyorganosiloxanes (POS) bearing Si-H units and POS bearing Si-(ethylene or acetylene unsaturation) units. Said preparation corresponds to the following synthesis (I), wherein: A = B = carbon; T1, T2 = cyclohexyl, t-butyl or methyl; T3, T4 = H; DVTMS = divinyltetramethylsiloxane; t-BuOK = potassium tert-butylate; T.A = room temperature. The invention is characterised in that it consists in carrying out said synthesis in a single step by bringing together salt (III) above, Karstedt (IV) in the presence of a solvent (V) (THF) and a base (VI) (t-BuOK) at room temperature.
摘要:
The invention concerns synthesis of functionalized organosilicium compounds comprising at least one activated azo group of formula (I): [(G0)3SiO1/2]m [(G0)2SiO2/2]n [G0SiO3/2]o [SiO4/2]p [(G2)a(G1)a'(Z-CO-HN=NH-CO-A)SiO(3-a-a')/2 ]. Said compounds can for example be a mixture of silane species of formula (ia): (C2H5O)3Si-(CH2)3-NH-CO-N=N-COOC2H3; with siloxane species of formulae: (2i.1a): [(CH3)3SiO1/2] [(C2H5O)2 {(CH2)3-NH-CO-N=N-COOC2H5} SiO1/2] et (2i.2a): [(CH3)3SiO1/2]2 [(C2H5O) {(CH2)3-NH-CO-N=N-COOC2H5} SiO2/2]. The invention also concerns the method for preparing said compounds (I), which consists in using at least one hydrazino precursor (II) (-HN-NH-) of compound (I), oxidizing the precursor (II) into an azo group for the compound (I) using at least one oxidizing agent (Ox) and at least one vase (B), said method consisting in selecting the base B among mineral bases and Ox among halogens, cyanurated compounds and chlorinated compounds and mixtures thereof, and in using a supplementary reagent selected among silanes (alone or mixed together) of formula (III): (G°)4-p1Si (G2')p1 [or example, (CH3)3(C2H5O)Si].
摘要:
The invention relates to the use of an effective amount of a coupling system (A) as an inorganic filler/elastomer coupling agent in rubber compositions comprising: (B) at least one natural or synthetic rubber elastomer, (C) an inorganic filler as reinforcing filler, (D) all or part of the other constituents or additives normally used particularly comprising (a) vulcanisation agent(s) the use being characterised in that: the coupling system (A) is a particular mixture of the following combination of ingredients (A1) and (A2): (A1) is at least one coupling agent selected from the following functionalised organosilicon compounds of formula (I): [(G0)3SiO1/2]m [(G0)2SiO2/2]n [G0SiO3/2]o [SiO4/2]p [(G2)a(G1)a'(Z-CO-N=N-CO-A)SiO(3-a-a')/2]g where the symbols Z, A, G0, G1, G2, a, a', m, n, o, p and q have the definitions given in claim 1, (A2) is at least one coating agent for the reinforcing filler comprising one compound with the single function Y in the structure thereof which is capable of bonding physically and chemically to inorganic filler and whereby, as a result of an increase in dispersion of the charge within the rubber matrix and a reduction in viscosity of the compositions, the use of raw compositions is made easier. Said coupling system (A) is incorporated in rubber compositors mad from isoprene elastomers.
摘要:
The invention relates to a silicon composition which can be crosslinked by means of dehydrogenative condensation between reactive units =SiH and =SiOH, using a catalytic complex of iridium. The aforementioned catalytic complex of iridium can be obtained by reacting: (i) a complex of iridium having formula (I): (IrΣΣ'2)n, wherein: A/ n is 1 or 2 and, if n is 1, S is a radical ligand LX with 3 electrons, but, if n is 2, S is a radical ligand X with 1 electron which acts like 3-electron ligand LX with the two iridium atoms; and B/ S', which may be identical or different, but are preferably identical, each represent a ligand L with 2 electrons; and (ii) a ligand Sd which is selected from R2S, R2O, NR3, carbenes and organophosphorous ligands.