Basic stabilisation systems for emulsion polymerised rubber
AssigneeBASF SE
InventorsGerrit Knobloch, Pierre Rota-Graziosi
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Abstract
There are described compositions comprising a) an emulsion crude rubber, synthetic latex or natural rubber latex subject to oxidative, thermal, dynamic and/or light-induced degradation, b) a compound of the formula (I) wherein R1 is C8-C12alkyl, R2 is hydrogen, C1-C12alkyl, cyclohexyl, 1-methylcyclohexyl, benzyl, α-methylbenzyl, α,α-dimethylbenzyl or —CH2—S—R1, R3 is C1-C12alkyl, benzyl, α-methylbenzyl, α,α-dimethylbenzyl or —CH2—S—R1, R4 is hydrogen or methyl, and c) a styrenated diphenylamine of the formula (II).
Claims10
A composition comprising
- (a) an emulsion crude nitrile butadiene rubber,
- (b) a compound of formula I
- wherein R1 is C8 or C12 alkyl,
- R2 is CH3,
- R3 is CH2—S—R1, and
- R4 is hydrogen
- (c) a styrenated diphenylamine of formula II
- wherein (b) is present from 0.133 to 0.267% by weight and (c) is present from 0.133 to 0.267% by weight based on the weight of the dry solids content of (a) and
- wherein the emulsion has been coagulated with a halogen containing system comprising calcium chloride.
A composition comprising
- (a) an emulsion crude nitrile butadiene rubber,
- (b) a compound of formula I
- wherein R1 is C8 or C12 alkyl,
- R2 is CH3,
- R3 is CH2—S—R1, and
- R4 is hydrogen
- (c) a styrenated diphenylamine of formula II
- wherein (b) is present from 0.133 to 0.267% by weight and (c) is present from 0.133 to 0.267% by weight based on the weight of the dry solids content of (a) and
- wherein the emulsion has been coagulated with a halogen containing system.
A method of stabilizing (a) an emulsion crude nitrile butadiene rubber, in which method
- (b) a compound of formula I
- wherein R1 is C8 or C12 alkyl,
- R2 is CH3,
- R3 is CH2—S—R1, and
- R4 is hydrogen and
- (c) a styrenated diphenylamine of formula II
- are mixed with component (a) or applied thereto,
- wherein (b) is present from 0.133 to 0.267% by weight and (c) is present from 0.133 to 0.267% by weight based on the weight of the dry solids content of (a) and
- wherein the emulsion has been coagulated with a halogen containing system comprising calcium chloride.
A method of stabilizing (a) an emulsion crude nitrile butadiene rubber, in which method
- (b) a compound of formula I
- wherein R1 is C8 or C12 alkyl,
- R2 is CH3,
- R3 is CH2—S—R1, and
- R4 is hydrogen and
- (c) a styrenated diphenylamine of formula II
- are mixed with component (a) or applied thereto,
- wherein (b) is present from 0.133 to 0.267% by weight and (c) is present from 0.133 to 0.267% by weight based on the weight of the dry solids content of (a) and
- wherein the emulsion has been coagulated with a halogen containing system.
Dependencies are inferred from the claim text.