Claims
- 1. A reinforcing aluminum-based filler for diene rubber compositions comprising an aluminum (oxide-)hydroxide corresponding, with the exception of any impurities and water of hydration, to Formula I, wherein a and b are real numbers:
- 2. The filler of claim 1, wherein the BET surface area is between 50 and 350 m2/g.
- 3. The filler of claim 1, wherein the average particle size dw is between 30 and 200 nm.
- 4. The filler filler of claim 1, wherein the disagglomeration rate α is greater than 6×10−3 μm−1/s.
- 5. The filler of claim 1, comprising an aluminum (oxide)-hydroxide of Formula (I) which satisfies the relationship: 0<a<3.
- 6. The filler of claim 5, comprising an aluminum (oxide)-hydroxide of Formula (I) which satisfies the relationship: 0<a<2.
- 7. A process for reinforcing a diene rubber composition comprising incorporating into the diene rubber composition an aluminum-based filler comprising an aluminum (oxide-) hydroxide corresponding, with the exception of any impurities and water of hydration, to Formula 1, wherein a and b are real numbers:
- 8. A process for manufacturing an aluminum-based filler comprising an aluminum (oxide-) hydroxide corresponding, with the exception of any impurities and water of hydration, to Formula 1, wherein a and b are real numbers:
- 9. The process of claim 8, wherein the Brönsted base is ammonium carbonate.
- 10. The process of claim 8 or 9, wherein the aluminum salt is aluminum sulphate or nitrate.
- 11. A process according to claim 8, wherein the filtrate is dried by cryogenic freeze-drying, spray-drying or under supercritical conditions.
- 12. The process according to claim 8, wherein the heat treatment temperature is carried out between 100° C. and 700° C.
- 13. A sulphur-vulcanizable rubber composition comprising at least one diene elastomer, a reinforcing white filler and a coupling agent linking the white filler and the elastomer, wherein white filler comprises in its entirety or in part by an aluminum-based filler comprising an aluminum (oxide-) hydroxide corresponding, with the exception of any impurities and water of hydration, to formula I, wherein a and b are real numbers:
- 14. The composition of claim 13, wherein the reinforcing white filler comprises the aluminum-based filler in an amount of more than 50% by weight of the total reinforcing white filler.
- 15. The composition of claim 14, wherein the reinforcing white filler comprises the aluminum-based filler in an amount of 100% of the reinforcing white filler.
- 16. The composition of claim 13 or 14, wherein the composition further comprises silica as reinforcing white filler.
- 17. The composition according to claim 13, wherein the composition comprises the reinforcing white filler in an amount of 20 to 300 phr (parts by weight per one hundred parts of elastomer).
- 18. The composition of claim 13, wherein the amount of coupling agent comprises between 10−7 et 10−5 moles per square meter of total reinforcing white filler.
- 19. The composition of claim 18, wherein the amount of coupling agent comprises between 5×10−7 and 5×10−6 moles per square meter of total reinforcing white filler.
- 20. The composition of claim 13, wherein the diene elastomer is selected from the group consisting of polybutadienes, polyisoprenes or natural rubber, butadiene-styrene copolymers, butadiene-isoprene copolymers, isoprene-styrene copolymers, butadiene-styrene-isoprene copolymers, and mixtures thereof.
- 21. The composition of claim 20, wherein the diene elastomer is a butadiene-styrene copolymer prepared in solution having a styrene content of between 20% and 30% by weight, a content of vinyl bonds of the butadiene part of between 15% and 65%, a content of trans-1,4 bonds of between 20% and 75% and a glass transition temperature of between −20° C. and −55° C.
- 22. The composition of claim 21, further comprising a polybutadiene having more than 90% cis-1,4 bonds.
- 23. A rubber article reinforced with an aluminum-based filler comprising an aluminum (oxide-) hydroxide corresponding, with the exception of any impurities and water of hydration, to formula I, wherein a and b are real numbers:
- 24. A tire reinforced with an aluminum-based filler comprising an aluminum (oxide)-hydroxide corresponding, with the exception of any impurities and water of hydration, to formula I, wherein a and b are real numbers:
- 25. A tread for a tire reinforced with an aluminum-based filler comprising an aluminum (oxide-) hydroxide corresponding, with the exception of any impurities and water of hydration, to formula I, wherein a and b are real numbers:
- 26. A device for measuring an ultrasound disagglomeration rate of a filler in the form of agglomerates of particles, said device comprising a circuit (1) within which a flow (2) of the particles suspended in a liquid (3) can circulate, and at least:
(i) a sample preparer (10), intended to receive a sample of filler to be tested and to send it through the circuit (1) in the form of the flow (2); (ii) a laser granulometer intended to measure the size of the agglomerates as the flow passes; and (iii) a treatment cell (30) provided with breaking means (35) for breaking up the agglomerates as the flow (2) passes; (iv) at least one vent to the open air (13, 33) for removing air bubbles due to the breaking operation.
- 27. A measuring device according to claim 26, wherein the breaking means is an ultrasonic probe (35).
- 28. The device of claim 26, wherein the continuous treatment cell (30) is arranged between the outlet (22) of the granulometer (20) and the inlet (11) of the preparer (10), such that the flow (2) of particles emerging from the preparer (10) passes through the laser granulometer (20) before entering the treatment cell (30).
- 29. The device of claim 27, wherein the treatment cell (30) is arranged such that the flow (2) of particles which penetrates into said cell (30), via an inlet (31), passes in front of the head (36) of the ultrasonic probe (35).
- 30. The device of claim 27, wherein the ultrasonic probe (35) has a power within a range from 10 to 2000 watts.
- 31. A method for measuring an ultrasound disagglomeration rate of a filler in the form of agglomerates of particles, comprising:
(a) introducing the filler into a liquid so as to form a homogenous liquid suspension; (b) circulating the liquid suspension in the form of a flow through a circuit comprising breaking means which, as the flow passes, break up the agglomerates, and a laser granulometer which, at regular intervals of time “t”, measures the size “d” of these agglomerates; (c) recording the evolution of the size “d” as a function of the time “t”; wherein (d) the disagglomeration rate or a parameter linked to this rate is deduced therefrom.
- 32. The method of claim 31, wherein the size measured is the average size in volume of the agglomerates of particles, referred to as dv, the disagglomer-ation rate, “α”, being represented by the gradient of the straight line [1/dv(t)=f(t)] observed in a zone of steady state conditions of disagglomeration.
- 33. The method of claim 31, wherein the breaking means is an ultrasonic probe.
Priority Claims (1)
Number |
Date |
Country |
Kind |
97/15128 |
Nov 1997 |
FR |
|
Parent Case Info
[0001] The present application is a continuation of PCT/EP98/07680, filed Nov. 27, 1998, now WO 99/28376.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09583653 |
May 2000 |
US |
Child |
10426359 |
Apr 2003 |
US |
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/EP98/07680 |
Nov 1998 |
US |
Child |
09583653 |
May 2000 |
US |