Polymer composition comprising a crosslinkable polyolefin with hydrolysable silane groups, catalyst and a surfactant interacting additive

1. A polymer composition comprising a surfactant interacting additive, which comprises solid substances with polar surface groups selected from the group consisting of TiO 2 , CaCO 3 , huntite, mica, kaolin, aluminium hydroxide, magnesium dihydroxide, SiO 2 , and a combination thereof, in an amount of from 0.01 to 5% by weight, wherein the polymer composition further comprises at least one silanol condensation catalyst, wherein each catalyst is selected from:

i) a compound of formula I

ArSO 3 H  (I)

or a precursor thereof, wherein

Ar is an 1 to 4 alkyl groups substituted aryl, wherein the aryl is phenyl or naphthyl, and wherein each alkyl group, independently, is a linear or branched alkyl with 10 to 30 carbons, wherein the total number of carbons in the alkyl groups is in the range of 20 to 80 carbons;

ii) a derivative of i) selected from the group consisting of an anhydride, an ester, an acetylate, an epoxy blocked ester and an amine salt thereof which is hydrolysable to the corresponding compound of formula I; and

iii) a metal salt of i) wherein the metal ion is selected from the group consisting of copper, aluminum, tin and zinc.

2. A polymer composition according to claim 1 , wherein the polymer composition is a silanol condensation catalyst masterbatch which further comprises a polymer matrix.

3. A polymer composition according to claim 1 , wherein the polymer composition further comprises a crosslinkable polyolefin with hydrolysable silane groups.

4. A polymer composition according to claim 1 , wherein Ar, of the compound of formula I, is naphthyl.

5. A polymer composition according to claim 1 , wherein each catalyst is selected from

a) C 12 -alkylated naphthyl sulfonic acids;

b) a derivative of a) selected from the group consisting of an anhydride, an ester, an acetylate, an epoxy blocked ester and an amine salt thereof which is hydrolysable to the corresponding compound a); and/or

c) a metal salt of a) wherein the metal ion is selected from the group consisting of copper, aluminum, tin and zinc.

6. A polymer composition according to claim 1 , wherein the polymer composition comprises the “at least one” silanol condensation catalyst in an amount of 0.0001 to 8 wt %.

7. A polymer composition according to claim 1 , wherein the surfactant interacting additive comprises a colour masterbatch.

8. A polymer composition according to claim 1 , wherein the surfactant interacting additive comprises TiO 2 and/or CaCO 3 .

9. A polymer composition according to claim 1 , wherein the surfactant interacting additive comprises hindered-amine light stabilizers (HALS).

10. A polymer composition according to claim 3 , wherein the crosslinkable polyolefin with hydrolysable silane groups comprises a polyethylene with hydrolysable silane groups.

11. A polymer composition according to claim 3 , wherein the crosslinkable polyolefin with hydrolysable silane groups comprises 0.001 to 15% by weight of silane compound.

12. A polymer composition according to claim 3 , which comprises a crosslinked polyolefin, wherein the crosslinked polyolefin is produced by crosslinking the crosslinkable polyolefin comprised in the polymer composition according to claim 3 .

13. A polymer composition according to claim 12 , wherein the polymer composition has a hot set elongation of less than 175% when measured according to method EN60811-2-1:1999.

14. An article comprising the polymer composition, according to claim 1 .

15. A process for producing an article, wherein said process comprises use of a polymer composition according to claim 1 .