Carbon black compositions
Suggested is a carbon black composition showing a narrow Aggregate Size Distribution (ASD) characterized by a ΔD 50 /D mode value of about 0.58 to about 0.65 and a Relative Span (D 90 −D 10 )/D 50 of about 0.5 to about 0.8, which is obtainable by means of a modified furnace reactor. The composition shows superior additive performance and allows producing e.g. bus or truck tires with improved wear resistance and reinforcement.
1. A polymer composition comprising a carbon black composition having the properties comprising
an Aggregate Size Distribution a ΔD 50 /D mode of 0.62 to 0.65,
a Relative Span (D 90 −D 10 )/D 50 of 0.7 to 0.8,
a Quartile Ratio (QR) D 75 /D 25 of 1.2 to 1.5,
a Polydispersity Index of 1.302 to 1.35, and
an STSA value of 90 to 180 m 2 /g.
2. The composition of claim 1 , obtained by the steps of
(A) subjecting a hydrocarbon starting material to a high temperature combustion gas stream to achieve thermal decomposition,
(B) cooling the reaction gases, and
(C) recovering the carbon black thus obtained,
wherein the reaction is conducted in a furnace reactor comprising the following elements:
(i) a combustion chamber;
(ii) a cylindrical tube for injection of the feedstock;
(iii) a Venturi shaped reaction tunnel for carbon black formation; and
(iv) a cylindrical tunnel to terminate carbon black formation by a quench,
wherein
(a) the combustion chamber narrows conically over its length l 1 from a diameter d 1 to a diameter d 2 ,
(b) the tube shows over its length l 2 a constant diameter d 2 ,
(c) the reaction tunnel expands over its length l 3 from diameter d 2 to diameter d 3 , and
(d) the cylindrical termination tunnel shows over its length l 4 a constant diameter d 3 ,
on condition the ratio d 2 :l 2 ranges from about 1:2 to about 1:6.
3. A method for improving the properties of the polymer composition of claim 1 , comprising the step of adding the carbon black composition.
4. A method for improving wear resistance and reinforcement of the polymer composition of claim 1 , comprising the step of adding the carbon black composition.
5. The method of claim 3 , wherein the polymer is a synthetic or natural rubber.
6. A method of using the carbon black composition of claim 1 as an additive for the polymer composition, comprising the step of adding the carbon black composition to the polymer composition.
7. A method of using the carbon black composition of claim 1 for improving wear resistance and reinforcement of the polymer composition, comprising the step of adding the carbon black composition to the polymer composition.
8. The method of claim 6 , wherein the polymer is a synthetic or natural rubber.
9. A method of using the carbon black composition of claim 1 as a pigment for the polymer composition, comprising the step of adding the carbon black composition as the pigment to the polymer composition.
10. A pneumatic tire comprising a carbon black composition having the properties comprising
an Aggregate Size Distribution ΔD 50 /D mode of 0.62 to 0.65,
a Relative Span (D 90 −D 10 )/D 50 of about 0.7 to about 0.8,
a Quartile Ratio (QR) D 75 /D 25 of 1.2 to 1.5,
a Polydispersity Index of 1.302 to 1.35, and
an STSA value of 90 to 180 m 2 /g.
11. The composition of claim 1 , wherein the carbon black composition additionally comprises a tint of from 125.1 to 131.8%.
12. The tire of claim 10 , wherein the carbon black composition additionally comprises a tint of from 125.1 to 131.8%.
13. The composition of claim 1 , which is a natural or synthetic rubber.
14. The tire of claim 10 , which is a natural or synthetic rubber.
15. The composition of claim 1 , wherein the carbon black composition shows a STSA value of from 120 to 180 m 2 /g.
16. The tire of claim 10 , wherein the carbon black composition shows a STSA value of from 120 to 180 m 2 /g.