Stabilization of cross-linked silane group containing polymers with phenomic stabilizers
View Patent ↗The present invention relates to a composition for cross-linking and stabilization of a polymer containing hydrolysable silane groups comprising a sulphonic acid as a silanol condensation catalyst characterized in that it comprises a stabilizer which is neutral or acidic, does not contain ester groups and is a compound according to formula (I): wherein R is an unsubstituted or substituted aliphatic or aromatic hydrocarbyl radical which may comprise heteroatoms, R′ is a hydrocarbyl radical, R″ is a hydrocarbyl radical and R′ and/or R″ being a bulky radical, X 1 , X 2 or X 3 is the same or different H or OH, whereby at least X 1 , X 2 or X 3 is OH, and n is 1 to 4; or a compound according to formula (II): R′″—(S) p —R′″ (II) wherein R′″ is an aliphatic hydrocarbyl radical and p is 1 to 6; or a mixture of any of such compounds, to a stabilized polymer comprising the above stabilizers and to a process for cross-linking and stabilization of silane group containing polymers in the presence of the above mentioned stabilizers.
1. A stabilized polyethylene comprising cross-linked silane groups, sulphonic acid, and a stabilizer, wherein the stabilizer is neutral or acidic, does not contain ester groups, and has the structure of formula (I):
wherein
R is an unsubstituted or substituted aliphatic or aromatic hydrocarbyl radical which may comprise heteroatoms,
R′ is a hydrocarbyl radical,
R″ is a hydrocarbyl radical,
X 1 , X 2 and ‘X 3 ’ ‘are’ independently H or OH, wherein at least one of X 1 , X 2 and ‘X 3 ’ is OH,
and n is 1 to 4; and
wherein the sulphonic acid has the structure of formula (III):
ArSO 3 H (III)
wherein Ar is a hydrocarbyl substituted aryl group and the total compound of formula (III) contains at least 14 carbon atoms.
2. The polymer according to claim 1 , wherein
R is an aliphatic hydrocarbyl radical which may comprise hydroxy groups,
X 1 is OH, X 2 and X 3 are H,
R′ is a bulky aliphatic hydrocarbyl radical,
R″ is an aliphatic hydrocarbyl radical,
and n is 2.
3. The polymer according to claim 2 , wherein
R is CH 2 ;
R′ is 1-methylcyclohexyl or tert-butyl; and
R″ is CH 3 .
4. The polymer according to claim 2 , wherein
R′ is 1-methylcyclohexyl or tert-butyl; and
R″ is CH 3 .
5. The polymer of claim 1 , wherein Ar is a hydrocarbyl substituted with the hydrocarbyl substituent benzene ring containing 8 to 20 carbon atoms or a hydrocarbyl substituted naphthalene ring with the hydrocarbyl substituent containing 4 to 18 carbon atoms.
6. The polymer of claim 1 , wherein Ar has a hydrocarbyl substituent which is an alkyl substituent having 10 to 18 carbon atoms.
7. The polymer of claim 1 , wherein the sulphonic acid is dodecyl benzene sulphonic acid or tetrapropyl benzene sulphonic acid.
8. A composition comprising a sulphonic acid and a stabilizer, wherein the stabilizer is neutral or acidic, does not contain ester groups, and has the structure of formula (I):
wherein
R is an unsubstituted or substituted aliphatic or aromatic hydrocarbyl radical which may comprise heteroatoms,
R′ is a hydrocarbyl radical,
R″ is a hydrocarbyl radical,
X 1 , X 2 and X 3 are independently H or OH, wherein at ea one of X 1 , X 2 and X 3 is OH,
and n is 1 to 4; and
wherein the sulphonic acid has the structure of formula (III):
ArSO 3 H (III)
wherein Ar is a hydrocarbyl substituted aryl group and the total compound of formula (III) contains at least 14 carbon atoms; and
further comprising a compound according to formula (II):
R′″—(S) p —R′″ (II)
wherein R′″ is an aliphatic hydrocarbyl radical and p is 1 to 6.
9. The composition of claim 8 wherein R′″ is an aliphatic hydrocarbyl radical from C 12 to C 20 and p is 1 or 2.
10. The composition of claim 9 wherein R′″ is octadecyl and p is 2.
11. The polymer of claim 1 , further comprising a compound according to formula (II):
R′″—(S) p —R′″ (II)
wherein R′″ is an aliphatic hydrocarbyl radical and p is 1 to 6.
12. The polymer of claim 11 wherein R′″ is an aliphatic hydrocarbyl radical from C 12 to C 20 and p is 1 or 2.
13. The polymer of claim 12 wherein R′″ is octadecyl and p is 2.