Silane crosslinkable polymer composition
AssigneeBorealis AG
InventorKristian Dahlen
Life of this patent
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Abstract
The invention relates to a crosslinkable polymer composition comprising (a) a polyolefin bearing hydrolysable silane groups and a silanol condensation catalyst compound, as well as to an article, preferably a cable, thereof. Also the use of the silanol condensation catalyst compound for crosslinking an article, preferably a layer of a cable is provided.
Claims8
A cable comprising a conductor surrounded by an inner semiconductive layer, an insulating layer, and an outer semiconductive layer, wherein at least the insulation layer comprises a polymer composition which comprises:
- (a) a polyolefin comprising a LDPE bearing hydrolysable silane groups of density 900 to 945 kg/m3 which is a homopolymer with silane groups which are introduced by grafting a silane group(s) containing compound to the LDPE;
- wherein the silane group(s) containing compound for grafting silane groups to produce LDPE (a) is a compound of formula (IIc),
- CH2═CH—(CH2)t—Si(OA)3 (IIc),
- wherein t=0 to 6;
- and
- A is a hydrocarbyl group, formyl group or acetyl group;
- and
- (b) a silanol condensation catalyst compound of formula (I):
- Me+n(OCR1═CR2—(C═O)R3)mR4s (Ic),
- wherein Me is Ti, Zr, Hf, Cu or Zn;
- n is 2 or 4;
- m is 2;
- s is 0 or 2;
- m+s=n;
- each R1 is a linear or branched (C1-C6)alkyl group;
- each R3 is a linear or branched (C1-C6)alkyl group;
- each R4 independently is OR1″;
- and
- R1″ is a linear or branched (C1-C6)alkyl group;
- wherein the polymer composition comprises hydrolysable silane groups in an amount of from 0.001 to 12 mol % based on the total amount of the polyolefin.
A process for producing a cable comprising a conductor surrounded by at least one layer, comprising co-extruding on the conductor one or more layers, wherein at least one layer comprises polymer composition which comprises:
- (a) a polyolefin comprising a LDPE bearing hydrolysable silane groups of density 900 to 945 kg/m3 which is a homopolymer with silane groups which are introduced by grafting a silane group(s) containing compound to the LDPE;
- wherein the silane group(s) containing compound for grafting silane groups to produce LDPE (a) is a compound of formula (IIc),
- CH2═CH—(CH2)t—Si(OA)3 (IIc),
- wherein t=0 to 6;
- and
- A is a hydrocarbyl group, formyl group or acetyl group;
- and
- (b) a silanol condensation catalyst compound of formula (I):
- Me+n(OCR1═CR2—(C═O)R3)mR4s (Ic),
- wherein Me is Ti, Zr, Hf, Cu or Zn;
- n is 2 or 4;
- m is 2;
- s is 0 or 2;
- m+s=n;
- each R1 is a linear or branched (C1-C6)alkyl group;
- each R3 is a linear or branched (C1-C6)alkyl group;
- each R4 independently is OR1″;
- and
- R1″ is a linear or branched (C1-C6)alkyl group;
- wherein the polymer composition comprises hydrolysable silane groups in an amount of from 0.001 to 12 mol % based on the total amount of the polyolefin.
Dependencies are inferred from the claim text.