Neodymium-catalyzed polybutadienes
The invention relates to a high-molecular-weight, linear, neodymium-catalyzed polybutadiene having a high proportion, >95%, of cis-1,4 units having a low proportion, <1%, of 1,2-vinyl content, and also having a small molar-mass-polydispersity index (MPI), characterized in that Mooney viscosity (ML 1+4 100° C.) of the polybutadiene is from 70 to 90 and The molar-mass-polydispersity index of the polybutadiene is smaller than 10.
1. High-molecular weight, linear polybutadienes comprising:
polybutadienes obtained by neodymium-catalysed polymerization of butadiene monomers, wherein the polybutadienes have:
>95% of cis-1,4 content;
<1% of 1,2-vinyl content;
a Mooney viscosity (ML 1+4 100° C.) of 70 to 90;
a molar mass distribution of Mw 90%<1,000,000 g/mol and Mw 10%>100,000 g/mol; and
a molar-mass-distribution index [Mw (90%)/Mw (10%)] of less than 10.
2. The polybutadienes according to claim 1 , wherein the polybutadienes have a solution viscosity (RT, 5.43%, toluene) of 350 to 630 mPas.
3. The polybutadienes according to claim 2 , wherein the polybutadienes have a branching index (solution viscosity/Mooney viscosity) of 5 to 7.
4. The polybutadiene according to claim 2 , wherein the polybutadienes have a Mooney relaxation after 30 sec of less than 6%.
5. A rubber mixture comprising the polybutadiene according to claim 1 .
6. A moulding comprising the rubber mixture of claim 5 .
7. The moulding according to claim 6 , wherein the moulding is a tire component.
8. An impact-modifying thermoplastic comprising the rubber mixture according to claim 5 .
9. A polystyrene and styrene/acrylonitrile copolymer comprising the rubber mixture according to claim 5 .
10. A golf ball comprising the rubber mixture according to claim 5 .
11. High-molecular weight, linear polybutadienes comprising:
>95% of cis-1,4 content;
<1% of 1,2-vinyl content;
a Mooney viscosity (ML 1+4 100° C.) is 70 to 90;
a molar mass distribution of Mw 90%<1,000,000 g/mol and Mw 10%>100,000 g/mol;
a molar-mass-distribution index [Mw (90%)/Mw (10%)] of less than 10; and
a branching index (solution viscosity/Mooney viscosity) of 5 to 7.
12. The polybutadienes according to claim 11 , wherein
the polybutadienes have a solution viscosity (RT, 5.43%, toluene) of 350 to 630 mPas.
13. High-molecular weight, linear polybutadienes comprising:
polybutadienes obtained by neodymium-catalysed polymerization of butadiene monomers, wherein the polybutadienes have:
>95% of cis-1,4 content;
<1% of 1,2-vinyl content;
a Mooney viscosity (ML 1+4 100° C.) of 70 to 90;
a solution viscosity (RT, 5.43%, toluene) of 400 to 580 mPas;
a branching index (solution viscosity/Mooney viscosity) of 5 to 7;
a molar mass distribution of Mw 90%<1,000,000 g/mol and Mw 10%>100,000 g/mol; and
a molar-mass-distribution index [Mw (90%)/Mw (10%)] of less than 10.