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US 10,066,078 B2Granted
Cross-linking of carboxylated nitrile rubbers by means of cross-linking systems containing resol
AssigneeArlanxeo Deutschland GmbH
InventorsHans Magg, Achim Welle
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Abstract
The invention relates to vulcanizable compositions based on carboxylated nitrile rubbers, at least one resol crosslinker, at least one silicatic filler and at least one specific silane, to a process for preparing these vulcanizable compositions, to a process for producing vulcanizates therefrom and to the vulcanizates thus obtained. The vulcanizates feature good mechanical and dynamic properties and an excellent compression set.
Claims18
Vulcanizable compositions comprising:
- (1) 100 parts by weight of a nitrile rubber having repeating units of at least one conjugated diene, at least one α,β-unsaturated nitrile, and at least one copolymerizable termonomer containing carboxyl group(s),
- (2) 1 to 50 parts by weight of at least one resol of the genera formula (II)
- in which
- Ra is H, —CH3, —CH2OH, or —CH2Br,
- Rb is —CH2OH or —CH2Br,
- Rc is a straight-chain or branched C1-C15-alkyl radical, and
- n and m are the same or different and are each integers of 0 to 25, and
- (3) one of:
- (3a) 20 to 100 parts by weight of at least one silicatic filler and 1 to 20% by weight, based on the weight of the silicatic filer, of at least one silane of the general formula (I)
- in which:
- R1, R2 and R3 are the same or different and are each straight-chain or branched C1-C25-alkyl radicals or R4—C(═O)— where R4 is straight-chain or branched C1-C25-alkyl, and
- R4 represents straight-chain or branched C1-C14-alkyl radicals being saturated, or one or more times unsaturated and having no, one, two or more substituents selected from vinyl, —SH, substituted or unsubstituted phenyl, methacryloyloxy and isocyanato, or is —R5—(S)x—R5—Si(OR1)(OR2)(OR3) in which R1, R2 and R3 are the same or different and are each as defined in formula (I), wherein R5 is a straight-chain or branched C1-C14-alkylene radical and x is a number from 1 to 8, and
- (3b) 20 to 125 parts by weight of a silicatic filer modified with a silane.
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A vulcanizable composition comprising:
- 100 parts by weight of a carboxylated nitrile rubber,
- 1 to 50 parts by weight of a resol of the general formula (II)
- in which
- Ra is H, —CH3, —CH2OH or —CH2Br,
- Rb is —CH2OH or —CH2Br,
- Rc is a straight-chain or branched C1-C15-alkyl radical, and
- n and m are the same or different and are each integers of 0 to 25,
- such that the resols contain 4-20% by weight of the hydroxymethyl groups and 4-5 wt % bromine, based on the total weight of the resol,
- 20 to 100 parts by weight of an inorganic silicatic filer, and
- an organosilane that is unreactive towards the resol, wherein an amount of organosilane is 1 to 20% by weight based on the weight of the silicatic filler.
7 more elements
Dependencies are inferred from the claim text.