Granted Patent B2

US 8,329,611 · App. 12/653,563 · Granted Dec 11, 2012

Abstract

Claims (13)

1. An extrudate comprising titania, a carboxyalkyl cellulose, and a hydroxyalkyl cellulose, wherein the weight ratio of carboxyalkyl cellulose to titania is from 1:100 to 3:100 and the weight ratio of hydroxyalkyl cellulose to titania is from 0.5:100 to 1:100.

2. The extrudate of claim 1 wherein the carboxyalkyl cellulose is a carboxymethyl cellulose.

3. The extrudate of claim 1 having a carboxyalkyl cellulose to hydroxyalkyl cellulose weight ratio of from 5:1 to 1:2.

4. The extrudate of claim 1 having a carboxyalkyl cellulose to hydroxyalkyl cellulose weight ratio of from 3:1 to 1:1.

5. The extrudate of claim 1 wherein the hydroxyalkyl cellulose is selected from the group consisting of 2-hydroxypropyl cellulose, 2-hydroxethyl cellulose, and mixtures thereof.

6. The extrudate of claim 1 wherein the hydroxyalkyl cellulose is selected from the group consisting of methyl 2-hydroxypropyl cellulose, methyl 2-hydroxethyl cellulose, and mixtures thereof.

7. The extrudate of claim 1 wherein the titania constitutes at least 10 weight percent of the extrudate.

8. The extrudate of claim 1 further comprising an inorganic oxide other than titania.

9. The extrudate of claim 8 having an inorganic oxide to titania weight ratio of less than 10:90.

10. The extrudate of claim 1 having a smoother outer surface than an extrudate not comprising the carboxyalkyl cellulose and the hydroxyalkyl cellulose.

11. The extrudate of claim 1 having less feathering than an extrudate not comprising the carboxyalkyl cellulose and the hydroxyalkyl cellulose.

12. The extrudate of claim 1 wherein the extrudate sticks to each other less than an extrudate not comprising the carboxyalkyl cellulose and the hydroxyalkyl cellulose.

13. The extrudate of claim 1 is more suitable for large scale production than an extrudate not comprising the carboxyalkyl cellulose and the hydroxyalkyl cellulose.

Assignments (11)