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 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 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 tunnel shows over its length l 4 a constant diameter d 3 ,
on condition that the ratio d 2 :l 2 ranges from about 1:2 to about 1:6.
2 . A carbon black composition showing a ΔD 50 /D mode of 0.58 to 0.65 and a Relative Span (D 90 -D 10 )/D 50 of about 0.5 to about 0.8.
3 . The composition of claim 2 , showing in addition a Quartile Ratio (QR) D 75 /D 25 of about 1.2 to about 1.5.
4 . The composition of claim 2 , showing in addition a Polydispersity Index of less than about 1.35.
5 . The composition of claim 2 , showing STSA value of about 90 to about 180 m 2 /g.
6 . The carbon black composition of claim 2 , obtained by the steps of
(A) subjecting a hydrocarbon starting material to a high temperature combustion gas stream in order 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 h 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.
7 . A process for obtaining a carbon black composition showing a ΔD 50 /D more ratio of 0.58 to 0.65 and a Relative Span of about 0.5 to about 0.8, comprising the following steps:
(A) subjecting a hydrocarbon starting material into a high temperature combustion gas stream in order to achieve thermal decomposition,
(B) cooling the reaction gases
(C) recovering of 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 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.
8 . A method for improving the properties of a polymer composition comprising the step of by adding the carbon black composition of claim 2 to the polymer composition.
9 . A method for improving wear resistance and reinforcement of a polymer composition, comprising the step of adding the carbon black composition of claim 2 to the polymer composition.
10 . The method of claim 8 , wherein the polymer is a synthetic or natural rubber.
11 . A method of using the carbon black composition of claim 2 as an additive for a polymer composition, comprising the step of adding the carbon black composition to the polymer composition.
12 . A method of using the carbon black composition of claim 2 for improving wear resistance and reinforcement of a polymer composition, comprising the step of adding the carbon black composition to the polymer composition.
13 . The method of claim 11 , wherein the polymer is a synthetic or natural rubber.
14 . A method of using the carbon black composition of claim 2 as a pigment, comprising the step of adding the carbon black composition as the pigment to a composition.
15 . A polymer composition comprising the carbon black composition of claim 2 .
16 . A pneumatic tire comprising the carbon black composition of claim 2 .