Organic-containing particulate having elevated auto-ignition temperatures

• US 8,410,197 B2
• Filed: 06/26/2002
• Issued: 04/02/2013
• Est. Priority Date: 07/06/2001
• Status: Active Grant

• Current Assignee: Grace GmbH & Co. KG
• Original Assignee: W R Grace & Company - CONN (WR Grace & Company)
• Inventors: Petry, Volker
• Primary Examiner(s): SZEKELY, PETER A
• Application Number:
  US10/183,854
• Publication Number:
  US 20030060554A1
• Time in Patent Office: 3,933 Days
• Field of Search: 523200-217, 524430-433, 524492-493, 252/381, 252397-407, 106/272, 428404-407
• US Class Current: 523/216
• CPC Class Codes: C01P 2004/32 Spheres
• CPC Class Codes: C01P 2004/61 Micrometer sized, i.e. from 1-100 micrometer
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C01P 2006/14 Pore volume
• CPC Class Codes: C01P 2006/19 Oil-absorption capacity, e.g. DBP values
• CPC Class Codes: C01P 2006/22 Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
• CPC Class Codes: C01P 2006/80 Compositional purity
• CPC Class Codes: C09C 1/3063 Treatment with low-molecular organic compounds
• CPC Class Codes: C09C 1/3072 Treatment with macro-molecular organic compounds
• CPC Class Codes: C09C 3/08 Treatment with low-molecular-weight non-polymer organic compounds C09C3/006, C09C3/048 take precedence
• CPC Class Codes: C09C 3/10 Treatment with macromolecular organic compounds C09C3/006 takes precedence
• CPC Class Codes: Y10T 428/2993 Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
• CPC Class Codes: Y10T 428/2995 Silane, siloxane or silicone coating
• CPC Class Codes: Y10T 428/2996 Glass particles or spheres
• CPC Class Codes: Y10T 428/2998 including synthetic resin or polymer

Abstract

The composition of this invention is an inorganic oxide particulate comprising at least 10% by weight organic material in which the particulate has an auto-ignition temperature which is at least 20° C. higher than the auto-ignition temperature of the particulate and organic material which does not contain antioxidant and/or inhibitor. Accordingly, a method has been developed in which one is able to elevate the auto-ignition temperature of such organic containing particulates. In a preferred embodiment the method comprises including antioxidant or inhibitor in the organic material prior to combining it with the inorganic oxide.

Claims

1. A plurality of discreet inorganic oxide particulates comprising a coating of organic material wherein said organic material is present in an amount of at least 10% by weight based on the weight of inorganic oxide and an antioxidant and/or inhibitor, wherein the particulates at a given volume have an auto-ignition temperature which is at least 20°

C. higher than the auto-ignition temperature of base particulates, the base particulates being the particulates and organic material without an antioxidant or inhibitor.

2. The particulates of claim 1 wherein the auto-ignition temperature of the particulates is at least 100°

C.

3. The particulates of claim 1 wherein the antioxidant comprises

4. The particulates of claim 1 wherein the antioxidant comprises

5. The particulates of claim 3 further comprising

6. The particulates of claim 1 wherein the inorganic oxide is a member of the group consisting of silica, talc and mineral fillers.

7. The particulates of claim 6 wherein the inorganic oxide is porous and has a pore volume of 0.4 cc/g to 2.0 cc/g.

8. The particulates of claim 7 wherein the porous inorganic oxide is silica.

9. The particulates of claim 1 having an average particle size in the range of 2 to 12 microns.

10. The particulates of claim 1 comprising 10 to 50% by weight organic material.

11. The particulates of claim 1 comprising at least 20% by weight organic material.

18. The particulates of claim 1 wherein the inorganic oxide is silica.

12. A method of elevating auto-ignition temperatures of a plurality of discreet inorganic oxide particulates comprising a coating of organic material in an amount of at least 10% by weight based on the weight of inorganic oxide, the method comprising including anti-oxidant or inhibitor with the organic material-containing inorganic oxide in order to raise the auto-ignition temperature of the particulates at least 20°

C. higher than the auto-ignition temperature of the particulates without the antioxidant or inhibitor.

13. A method of claim 12 wherein the antioxidant comprises a compound

14. A method of claim 12 wherein the antioxidant comprises

15. A method of claim 13 in which the antioxidant further comprises

16. A method of claim 12 comprising including the antioxidant and/or inhibitor in the organic material prior to combining the organic material with the inorganic oxide.

17. A method of claim 12 wherein the inorganic oxide is silica.