摘要:
The invention concerns a crosslinkable or crosslinked rubber composition for use to produce a running tread of a tyre casing, and a tyre casing incorporating said running tread. The inventive rubber composition is based on: at least one or several diene elastomers, and a plasticizing agent including a glycerol oleic acid triester, and is such that said plasticizing agent comprises: in accordance with a mass fraction ranging between 45 % and 100 %, one or several compounds not extracted from petroleum, synthetic and/or natural, which include at least a glycerol fatty acid triester, such that the assembly formed by the fatty acid(s) comprise said oleic acid in a mass fraction not less than 60 %; and in a mass fraction ranging between 55 % and 0 %, one or several plasticizing oils derived from petroleum, of the paraffin, aromatic, naphthene type. The invention is particular applicable to tyre casings of the passenger vehicle type.
摘要:
The invention concerns a method for preparing a dilithium initiator for use in anionic polymerisation, a method for preparing by anionic polymerisation a living diene elastomer provided with a carbon-lithium group at each of its chain ends, and a method for preparing a three-block copolymer from said living diene elastomer. The inventive method for preparing a dilithium initiator consists in reacting in an aliphatic or alicylic hydrocarbon solvent a first reagent consisting of a dialkenyl benzene and a second reagent consisting of secondary butyl lithium, so that the ratio of the number of moles of the first reagent over the number of moles of the second reagent is substantially equal to 0.5, and said method is characterised in that it consists in causing said reagents to react in the presence of a diamine, so that the resulting initiator essentially consists of a double adduct resulting from the addition of a secondary butyl lithium on each of the double bonds borne by said dialkenyl benzene.
摘要:
A radial tyre (10) having at least one crown reinforcement (13) and a carcass reinforcement (14) consisting of at least one ply (20) of rubberised fabric (24) including radial wires (25) substantially parallel to the radial direction (xx'), said radial ply comprising at least one lap weld (21) formed by overlapping two edges (22, 23) of said fabric (24) and circumferentially bordered by two rims (28, 29). In each of said edges (22, 23), said weld (21) comprises at least one notch (26, 27) located under the crown reinforcement (13) such that it cuts through a plurality of radial wires (25). Compared with conventional prior art radial tyres, said tyre has side walls with a substantially enhanced outward appearance.
摘要:
La présente invention a pour objet une composition de caoutchouc destinée à la fabrication d'enveloppes de pneumatiques routiers ayant une résistance au roulement améliorée à base de silice précipitée ayant une surface spécifique relativement élevée et des propriétés de porosité particulières.
摘要:
The invention concerns an adhesive composition useful for providing textile fibres with adhesion to a crosslinkable rubber composition, textile fibres sized with said adhesive composition, a light-permeable composite consisting of said sized textile fibres and a crosslinked rubber composition, and a tyre casing whereof the sidewalls comprise said composite. The inventive adhesive composition comprises an aqueous thermosetting phenolic adhesive including at least a diene elastomer and at least an organic pigment. Said adhesive composition is characterised in that it results from the reaction of said aqueous thermosetting phenolic adhesive and an aqueous pigment dispersion containing said organic pigment.
摘要:
The invention concerns a tyre casing whereof the sidewalls comprise a vulcanised elastomer composition, and a method for forming an even glazed film on at least one of said sidewalls. The invention is characterised in that said composition comprises in combination: between 0.3 and 5 parts wt.% of elastomer parts of a polymer comprising, on either side of an oxy radical, respectively an alkyl group and at least an alkene polyoxide block of formula (CnH2nO)z which is bound to a hydrogen atom at the chain end, and between 0.5 and 10 parts wt.% of elastomer parts of an alkaline metal salt of an alkylsulphonic or alkylsulphuric acid. The invention also concerns a method for forming an even glazed film on said sidewalls which consists in exposing the latter for at least 48 hours, in a chamber at 25 °C at least, to an ozone environment of at least 20 parts per hundred millions. The invention is particularly useful for protecting said casing against the visible effects of migrations of antioxidants and anti-ozone agents present in said sidewalls.
摘要:
La présente invention concerne une composition de caoutchouc vulcanisable qui est utilisable pour la fabrication d'enveloppes de pneumatiques, un procédé de préparation de cette composition et une enveloppe de pneumatique dont la bande de roulement comprend une telle composition, cette dernière présentant des propriétés hystérétiques et physiques améliorées à l'état vulcanisé, tout en conservant des propriétés de mise en oeuvre satisfaisantes. Une composition selon l'invention comprend une charge blanche renforçante et elle est telle qu'elle comprend au moins un copolymère diénique à blocs qui est destiné à interagir avec ladite charge blanche renforçante et qui comprend à l'une au moins de ses extrémités de chaîne un bloc polysiloxane se terminant par un groupe trialkylsilyl, ledit bloc répondant à la formule:
[-(SiR 1 R 2 O)-] x -SiR 3 R 4 R 5 ,
où R 1 , R 2 , R 3 , R 4 et R 5 représentent des groupes alkyle ayant de 1 à 20 atomes de carbone et où x est un nombre entier naturel non nul.
摘要:
La présente invention concerne un système catalytique, son procédé de préparation et un procédé de préparation d'un copolymère d'éthylène et d'un diène conjugué utilisant ce système catalytique. Un système catalytique selon l'invention comprend:
d'une part, un complexe organométallique représenté par l'une des formules génériques suivantes A ou B :
où Ln représente un métal d'un lanthanide dont le numéro atomique peut aller de 57 à 71, où X représente un halogène pouvant être le chlore, le fluor, le brome ou l'iode, où Cp 1 et Cp 2 comprennent chacun un groupe cyclopentadiényle ou fluorényle qui est substitué ou non et où P est un pont répondant à la formule MR 2 , où M est un élément de la colonne IVA de la classification périodique de Mendeleev, et où R est un groupe alkyle comprenant de 1 à 20 atomes de carbone, et
d'autre part, un co-catalyseur qui est choisi parmi un groupe comprenant un alkyl magnésium, un alkyl lithium, un alkyl aluminium, ou un réactif de Grignard, ou qui est constitué d'un mélange de ces constituants.
摘要翻译:催化体系包括有机金属配合物,由此与所述助催化剂的有机金属配合物的关联可确保一个满意的聚合收率的。 催化体系包括有机金属配合物,由此与所述助催化剂的有机金属配合物的关联可确保一个满意的聚合收率的。 催化体系包括:(a)式餐饮由一般器Cp1-LN(X)-Cp2(A)或(B)表示的有机金属配合物; (B)从烷基镁,烷基锂和烷基铝和/或格氏反应物中选择的助催化剂:原子序数57-71的Ln为镧系元素金属; X =在式A中的卤素,CP1为通过在烷基甲硅烷基取代的环戊二烯基,(C5H4)(SiMe3)和式B中,CP2为环戊二烯基substituiertem由(C5H3)(SiMe3)或非取代的芴基,C 13 H 8。 在式A中,两个配体CP 1,每个包括一个substituiertem环戊二烯基,连接至Ln。 在式B中,配体分子,其包含2个Cp2为非环戊二烯基或芴基(任选地substituiertem)基团通过桥连基团式MR2的互连至Ln:M = IVA族元素; 和R =烷基1-20C独立权利要求中包括用于制备催化体系的和共聚合物的制备方法。
摘要:
The invention concerns a rubber based product, comprising at least one buffer zone for trapping oxygen external to said product so as to protect from oxidation at least one sensitive zone of said product, said or each buffer zone containing a composition based on at least one elastomer comprising at least one iron (III) salt for activating oxidation in said composition. The invention is characterised in that said salt belongs to the group consisting of iron (III) acetylacetonate and carboxylic acids iron (III) salts corresponding to the formula: Fe(CnH2nO2)3 in which n ranges between 6 and 23. Said product is obtained by incorporating by mechanical work said salt in the elastomer or elastomers contained in said composition, for said buffer zone. The invention is particularly useful in a tyre cover providing improved rolling resistance.