Patent EP-2423234-A1 (EP)
Inventor: KLIMPEL MICHAEL DR
IPC: C08L9/02
Filed: 2010-08-31
Abstract: Rubber blend comprises: a first nitrile rubber comprising repeating units derived from at least one conjugated diene, at least one alpha , beta -unsaturated nitrile and optionally at least one further copolymerizable monomers, and at least one structural element comprising e.g. dithioformic acid derivative (I) or methylsulfanylthiocarbonylsulfanyl; and a second nitrile rubber different from the first nitrile rubber comprising repeating units derived from at least one conjugated diene, at least one alpha , beta -unsaturated nitrile and optionally at least one further copolymerizable monomer. Rubber blend comprises: (a) a first nitrile rubber exhibiting a weight average molecular weight of not > 50000 g/mol, which comprises (i) repeating units derived from at least one conjugated diene, at least one alpha , beta -unsaturated nitrile and optionally at least one further copolymerizable monomers, and (ii) at least one structural element comprising dithioformic acid derivative of formula (Z-(M) n-(X) t-C(=S)-S-) (I), hydrocarbon compound of formula (-(M) m-R) (II) or (Z-(M) n)-) (IV), methylsulfanylthiocarbonylsulfanyl or trithiocarbonic acid derivative of formula (-S-C(=S)-S-(M) m-R) (III); and (b) a second nitrile rubber different from the first nitrile rubber, which exhibits a weight average molecular weight of greater than 50000 g/mol and a Mooney viscosity of 20-150 at 100[deg] C, comprising repeating units derived from at least one conjugated diene, at least one alpha , beta -unsaturated nitrile and optionally at least one further copolymerizable monomer. Z : carbocyclic, heterocyclic (both optionally mono- or polyunsaturated), alkyl (optionally branched and optionally mono- or polyunsaturated), H, (hetero)aryl, (hetero)arylalkyl, alkoxy, (hetero)aryloxy, NH 2, amido, hydroxyimino, carbamoyl, alkoxycarbonyl, F, Cl, Br, I, OH, phosphonato, phosphinato, alkylthio, arylthio, sulfanyl, thiocarboxy, sulfinyl, sulfono, sulfino, sulfeno, sulfonic acid, sulfamoyl, silyl, silyloxy, nitrile, carbonyl, carboxyl, oxycarbonyl, oxysulfonyl, oxo, thioxo, borate, selenate, epoxy, cyanate, thiocyanate, isocyanate, isothiocyanate or isocyanide; R : Z (when m is not equal to 0) or carbocyclic, heterocyclic (both optionally mono- or polyunsaturated), alkyl (optionally branched and optionally mono- or polyunsaturated), H, (hetero)aryl, (hetero)arylalkyl, alkoxy, (hetero)aryloxy, NH 2, amido, carbamoyl, alkylthio, arylthio, sulfanyl, thiocarboxy, sulfinyl, sulfono, sulfino, sulfeno, sulfonic acids, sulfamoyl, carbonyl, carboxyl, oxycarbonyl, oxysulfonyl, oxo, thioxo, epoxy, cyanate, thiocyanate, isocyanate, isothiocyanate or isocyanides (when m = 0); M : repeating units of at least one mono- or polyunsaturated monomer, preferably dienes (optionally conjugated), alkynes or vinyl compounds, or structure element derived from polymers comprising polyether, preferably polyalkylene glycol ether or polyalkylene oxide, polysiloxane, polyol, polycarbonate, polyurethane, polyisocyanate, polysaccharide, polyester or polyamide; n, m : 0-10000; t : 0 or 1 (when n = 0) or 1 (when n is not equal to 0); and X : C((Z) 2), N(Z), P(Z), P(=O)(Z), O, S, S(=O) or S(=O) 2. Independent claims are also included for: (1) a vulcanizable mixture comprising the above rubber blend, at least one crosslinking agent, optionally at least one filler and optionally at least one further rubber additive; (2) producing vulcanizates, comprising crosslinking the above vulcanizable mixture, preferably by adding at least one crosslinking agent or by photochemical activation; and (3) vulcanizates, preferably molded parts obtainable by the above method.