Tin-free catalyst-containing composition for a Monosil process with optimized process properties

1. A composition comprising:

(i) from 5 to 60% by weight content of 2-ethylhexanoic acid [H 3 C(CH 2 ) 3 CH(C 2 H 5 )COOH],

(ii) a monounsaturated organofunctional alkoxysilane of formula (I)

A-SiR 2 x (OR 1 ) 3-x   (I),

wherein

each R 1 is independently a linear or branched hydrocarbon moiety having from 1 to 4 C atoms,

R 2 is methyl,

x is 0 or 1, and

A is a monovalent olefin group of the formula (R 3 ) 2 C═C(R 3 )-M k -, where k is 0 or 1, in which groups R 3 are identical or different and R 3 is a hydrogen atom or a methyl group and M is —CH 2 —, —(CH 2 ) 2 —, —(CH 2 ) 3 — and —C(O)O—(CH 2 ) 3 —,

(iii) a free-radical generator, and

(iv) optionally another component,

wherein a content of component (ii) is at least 20% by weight of the composition, and

wherein the entirety of all components (i) to (iv) gives 100% by weight.

2. The composition of claim 1 , comprising 15 to 45% by weight of 2-ethylhexanoic acid.

3. The composition of claim 1 , wherein a content of component (ii) is from 20 to 94.95% by weight.

4. The composition of claim 1 , wherein a content of component (iii) is from 0.05 to 10% by weight.

5. The composition of claim 4 , wherein the free-radical generator component (iii) is at least one organic peroxide and/or organic perester selected from the group consisting of tert-butyl peroxypivalate, tert-butyl 2-ethylperoxyhexanoate, dicumyl peroxide, di-tert-butyl peroxide, tert-butyl cumyl peroxide, di(tert-butylperoxyisopropyl)benzene, 1,3-di(2-tert-butylperoxyisopropyl)benzene, 1,4-di(2-tert-butylperoxyisopropyl)benzene, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hex-3-yne, di-tert-amyl peroxide, 1,3,5-tris(2-tert-butylperoxyisopropyl)benzene, 1-phenyl-1-tert-butylperoxyphthalide, alpha,alpha′-bis(tert-butylperoxy)diisopropylbenzene, 2,5-dimethyl-2,5-di-tert-butylperoxyhexane, 1,1-di(tert-butylperoxy)-3,3,5-trimethylcyclohexane, n-butyl 4,4-di(tert-butylperoxy)valerate, ethyl 3,3-di(tert-butylperoxy)butyrate, and 3,3,6,9,9-hexamethyl-1,2,4,5-tetraoxacyclononane.

6. The composition of claim 1 , comprising the other component (iv).

7. The composition of claim 1 , comprising, as component (iv), at least one additional substance selected from the group consisting of pentaerythrityl tetrakis[3-(3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl)propionate], 2,6-di-tert-buty 1-4-methylphenol, octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 4,4′-bis(1,1-dimethylbenzyl)diphenylamine, N,N′-bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hydrazine, 6,6′-di-tert-butyl-2,2′-thiodi-p-cresol, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, tris(2-tert-butyl-4-thio(2′-methyl-4-hydroxy-5′-tert-butyl)phenyl-5-methyl)phenyl phosphite and 2,2,4-trimethyl-1,2-dihydroquinoline (polymerized).

8. The composition of claim 1 , wherein component (ii) is at least one member selected from the group consisting of vinyltrimethoxysilane, vinyltriethoxysilane, and 3-methacryloxytrimethoxysilane.

9. The composition of claim 1 , comprising:

(i) from 9 to 40% by weight of 2-ethylhexanoic acid [H 3 C(CH 2 ) 3 CH(C 2 H 5 )COOH],

(ii) from 20 to 88% by weight of vinyltrimethoxysilane or vinyltriethoxysilane or 3-methacryloxypropyltrimethoxysilane,

(iii) from 3 to 10% by weight of dicumyl peroxide and

(iv) optionally a total of from 0.05 to 15% by weight of an additional substance or of a plurality of additional substances,

where an entirety of all components (i) to (iv) is 100% by weight.

10. The composition of claim 1 , comprising, as component (iv), from 0 to 10% by weight of a stabilizer or metal deactivator selected from the group consisting of pentaerythrityl tetrakis [3-(3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl)propionate], 2,6-di-tert-butyl-4-methylphenol, octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 4,4′-bis(1,1-dimethyl benzyl)diphenylamine, N,N′-bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hydrazine, 6,6′-di-tert-butyl-2,2-thiodi-p-cresol, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, tris-(2-tert-butyl-4-thio(2′-methyl-4-hydroxy-5′-tert-butyl)phenyl-5-methyl)phenyl phosphite and 2,2,4-trimethyl-1,2-dihydroquinoline (polymerized).

11. A solid composition, which comprises:

the composition of claim 1 , as a first component, and

a carrier, wherein

a quantity of the first component is from 10 to 50% by weight, based on a weight of the carrier, and the carrier material is a thermoplastic polyolefin or an inorganic carrier material.

12. A process for producing a thermoplastic polyolefin, comprising reacting the composition according to claim 1 together with at least one thermoplastic polyolefin in a Monosil process.

13. The process according to claim 12 ,

the thermoplastic polyolefin, the composition, and also optionally another additive, are metered into a heated screw-based extruder to obtain a molten mixture, the molten mixture is heated therein to obtain a melt, the melt is conveyed and extruded by way of a die to obtain an extrudate, the extrudate is passed into a water bath for crosslinking and the extrudate is permitted to react until dimensional stability is achieved and then the resultant molding is dried.

14. A molding obtained by the process of claim 13 .