1-14. (canceled)
15. A process for making a water dispersible titanium dioxide slurry comprising:
(a) mixing dry titanium dioxide pigment with water to form a first mixture having a pigment concentration of from about 14 to 40 weight percent based on the weight of the first mixture then adjusting the pH of this first mixture to about 7 with aqueous sodium hydroxide;
(b) heating the first mixture of step a) to a temperature of about 40 C to form a heated first mixture;
(c) adding to the heated first mixture about 0.15 to 0.65 moles of a phosphoric acid per kilogram of dry titanium dioxide pigment and a sodium aluminate aqueous solution to form a second mixture comprising aluminum phosphate, wherein the phosphoric acid and the sodium aluminate aqueous solutions are added to the heated first mixture at a rate such that the pH of the second mixture is maintained at about 5 to 8 and the second mixture is substantially free of zirconia andor silica;
(d) curing the second mixture for about 10 to 30 minutes to form a cured mixture;
(e) filtering the cured mixture and recovering, washing, drying, and fluid energy milling a treated titanium dioxide pigment comprising aluminum phosphate;
(f) blending the treated titanium dioxide pigment comprising aluminum phosphate with water to form a third mixture;
(g) adjusting the pH of the third mixture to form a slurry wherein the slurry comprises 70 to 80 percent by weight of the treated titanium dioxide pigment based on the weight of the slurry.
16. The process of claim 35 wherein in step (c) the addition of the sodium aluminate aqueous solution is such that the ratio of the moles of a phosphorous to the moles of an aluminum in the second mixture is from about 0.25 to 0.6.
17. The process of claim 35 wherein in step (c) the addition of the sodium aluminate aqueous solution is such that the ratio of the moles of phosphorous to the moles of aluminum in the second mixture is about 0.5.
18. The process of claim 35 wherein the amount of the phosphoric acid added in step (c) is from about 0.23 to 0.52 moles per kilogram of the dry titanium dioxide pigment.
19. The process of claim 35 wherein the dry titanium dioxide pigment is rutile.
20. A slurry produced from the process of claim 35.
21. The process of claim 35 wherein the slurry in step (g) is substantially free of a dispersant.
22. A process for making a water dispersible titanium dioxide slurry comprising:
(a) mixing dry titanium dioxide pigment with water to form a first mixture having a pigment concentration of from about 14 to 40 weight percent based on the weight of the first mixture then adjusting the pH of this first mixture to about 7 with aqueous sodium hydroxide;
(b) heating the first mixture of step a) to a temperature of about 40 C to form a heated first mixture;
(c) adding to the heated first mixture about 0.15 to 0.65 moles of a phosphoric acid per kilogram of dry titanium dioxide pigment and a sodium aluminate aqueous solution to form a second mixture comprising aluminum phosphate, wherein the phosphoric acid and the sodium aluminate aqueous solutions are added to the heated first mixture at a rate such that the pH of the second mixture is maintained at about 5 to 8 and the second mixture is substantially free of zirconia andor silica;
(d) curing the second mixture for about 10 to 30 minutes to form a cured mixture;
(e) filtering the cured mixture and recovering, washing, drying, and fluid energy milling a treated titanium dioxide pigment comprising aluminum phosphate;
(f) blending the treated titanium dioxide pigment comprising aluminum phosphate with water substantially free of a dispersant to form a third mixture;
(g) adjusting the pH of the third mixture to form a slurry that is substantially free of a dispersant wherein the slurry comprises 70 to 80 percent by weight of the treated titanium dioxide pigment based on the weight of the slurry.
23. The process of claim 35 wherein in step (c) the addition of the sodium aluminate aqueous solution is such that the ratio of the moles of a phosphorous to the moles of an aluminum in the second mixture is from about 0.25 to 0.6.
24. The process of claim 35 wherein in step (c) the addition of the sodium aluminate aqueous solution is such that the ratio of the moles of phosphorous to the moles of aluminum in the second mixture is about 0.5.
25. The process of claim 35 wherein the amount of the phosphoric acid added in step (c) is from about 0.23 to 0.52 moles per kilogram of the dry titanium dioxide pigment.
26. The process of claim 35 wherein the dry titanium dioxide pigment is rutile.
27. A slurry produced from the process of claim 42.
28. The process of claim 35 wherein the slurry in step (g) is substantially free of a dispersant.
29. The process of claim 35 wherein the slurry in step (g) is substantially free of a dispersant.
30. A process for making a water dispersible titanium dioxide slurry comprising:
(h) mixing dry titanium dioxide pigment with water to form a first mixture having a pigment concentration of from about 14 to 40 weight percent based on the weight of the first mixture then adjusting the pH of this first mixture to about 7 with aqueous sodium hydroxide;
(i) heating the first mixture of step a) to a temperature of about 40 C to form a heated first mixture;
(j) adding to the heated first mixture about 0.15 to 0.65 moles of a phosphoric acid per kilogram of dry titanium dioxide pigment and a sodium aluminate aqueous solution to form a second mixture comprising aluminum phosphate, wherein the phosphoric acid and the sodium aluminate aqueous solutions are added to the heated first mixture at a rate such that the pH of the second mixture is maintained at about 5 to 8;
(k) curing the second mixture for about 10 to 30 minutes to form a cured mixture;
(l) filtering the cured mixture and recovering, washing, drying, and fluid energy milling a treated titanium dioxide pigment consisting of a coating comprising aluminum phosphate;
(m) blending the treated titanium dioxide pigment consisting of a coating comprising aluminum phosphate with water to form a third mixture;
(n) adjusting the pH of the third mixture to form a slurry wherein the slurry comprises 70 to 80 percent by weight of the treated titanium dioxide pigment consisting of a coating comprising aluminum phosphate based on the weight of the slurry.
31. The process of claim 35 wherein in step (c) the addition of the sodium aluminate aqueous solution is such that the ratio of the moles of a phosphorous to the moles of an aluminum in the second mixture is from about 0.25 to 0.6.
32. The process of claim 35 wherein in step (c) the addition of the sodium aluminate aqueous solution is such that the ratio of the moles of phosphorous to the moles of aluminum in the second mixture is about 0.5.
33. The process of claim 35 wherein the amount of the phosphoric acid added in step (c) is from about 0.23 to 0.52 moles per kilogram of the dry titanium dioxide pigment.
34. The process of claim 35 wherein the dry titanium dioxide pigment is rutile.
35. A slurry produced from the process of claim 35.
36. The process of claim 35 wherein the slurry in step (g) is substantially free of a dispersant.
37. A process for making a water dispersible titanium dioxide slurry comprising:
(h) mixing dry titanium dioxide pigment with water to form a first mixture having a pigment concentration of from about 14 to 40 weight percent based on the weight of the first mixture then adjusting the pH of this first mixture to about 7 with aqueous sodium hydroxide;
(i) heating the first mixture of step a) to a temperature of about 40 C to form a heated first mixture;
(j) adding to the heated first mixture about 0.15 to 0.65 moles of a phosphoric acid per kilogram of dry titanium dioxide pigment and a sodium aluminate aqueous solution to form a second mixture comprising aluminum phosphate, wherein the phosphoric acid and the sodium aluminate aqueous solutions are added to the heated first mixture at a rate such that the pH of the second mixture is maintained at about 5 to 8;
(k) curing the second mixture for about 10 to 30 minutes to form a cured mixture;
(l) filtering the cured mixture and recovering, washing, drying, and fluid energy milling a treated titanium dioxide pigment consisting of a coating comprising aluminum phosphate;
(m) blending the treated titanium dioxide pigment consisting of a coating comprising aluminum phosphate with water substantially free of a dispersant to form a third mixture;
(n) adjusting the pH of the third mixture to form a slurry that is substantially free of a dispersant wherein the slurry comprises 70 to 80 percent by weight of the treated titanium dioxide pigment consisting of a coating comprising aluminum phosphate_based on the weight of the slurry.
38. The process of claim 35 wherein in step (c) the addition of the sodium aluminate aqueous solution is such that the ratio of the moles of a phosphorous to the moles of an aluminum in the second mixture is from about 0.25 to 0.6.
39. The process of claim 35 wherein in step (c) the addition of the sodium aluminate aqueous solution is such that the ratio of the moles of phosphorous to the moles of aluminum in the second mixture is about 0.5.
40. The process of claim 35 wherein the amount of the phosphoric acid added in step (c) is from about 0.23 to 0.52 moles per kilogram of the dry titanium dioxide pigment.
41. The process of claim 35 wherein the dry titanium dioxide pigment is rutile.
42. A slurry produced from the process of claim 42.
43. The process of claim 35 wherein the slurry in step (g) is substantially free of a dispersant.
44. The process of claim 35 wherein the slurry in step (g) is substantially free of a dispersant.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A vehicle engine control device stopping fuel injection if a predetermined fuel cut condition is satisfied,
during running with the fuel injection stopped, when inertia of a power transmission system rotating with the engine has a smaller rate of inertia of the power transmission system acting on rotation of an output shaft of the engine, the fuel injection being started at a lower engine rotation speed as compared to the case of a larger rate of inertia of the power transmission system acting on rotation of the output shaft of the engine,
a clutch capable of connecting and interrupting power transmission between the engine and the power transmission system being interposed between the engine and the power transmission system,
a rate of inertia of the power transmission system acting on rotation of the output shaft of the engine being configured to decrease as a clutch stroke of the clutch that is an operation amount of a clutch pedal increases, and
an engine rotation speed for starting the fuel injection being set to a lower value as the clutch stroke increases.
2. The vehicle engine control device of claim 1, wherein
the engine rotation speed for starting the fuel injection is set to a lower value as a clutch operation speed becomes higher.