Biocidal particles of methylated polystyrene

• US 7,687,072 B2
• Filed: 10/31/2002
• Issued: 03/30/2010
• Est. Priority Date: 10/31/2002
• Status: Active Grant

• Current Assignee: Auburn University
• Original Assignee: Auburn University
• Inventors: Chen, Yongjun, Worley, Shelby D.
• Primary Examiner(s): Silverman; Eric E
• Application Number:
  US10/287,449
• Publication Number:
  US 20040086480A1
• Time in Patent Office: 2,707 Days
• Field of Search: None
• US Class Current: 424/489
• CPC Class Codes: A01N 59/00 Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
• CPC Class Codes: C08F 112/08 Styrene
• CPC Class Codes: C08F 8/24 Haloalkylation
• CPC Class Codes: C08F 8/30 Introducing nitrogen atoms or nitrogen-containing groups

Abstract

Methylated polystyrene having pendant N-halamine and N-halamine precursor groups. Biocidal particles have been prepared by reacting highly crosslinked methylated polystyrene beads as starting materials with various N-halamine precursor compounds. The resulting polymer beads are halogenated with chlorine or bromine. The porous beads will be useful in disinfection applications, as well as for sanitization and controlling noxious odor when mixed with absorbent materials in items such as disposable diapers, infant swimwear, incontinence pads, bandages, sanitary napkins, pantiliners, mattress covers, shoe inserts, sponges, animal litter, carpets, and fabrics.

Claims

1. A biocidal methylated polystyrene having pendant hydantoin groups, each hydantoin group being linked from a first nitrogen atom via a methylene group pendant from a carbon atom of each benzene ring of the polystyrene to which each hydantoin group is attached, wherein said biocidal methylated polystyrene is prepared from a porous methylated polystyrene that is at least 3% crosslinked, and a chlorine or bromine atom is bonded to a second nitrogen atom of a hydantoin group.

2. The biocidal methylated polystyrene of claim 1, wherein the polystyrene is crosslinked with divinylbenzene.

3. The biocidal methylated polystyrene of claim 1, wherein the polystyrene is from about 3 to about 10 percent crosslinked.

4. The biocidal methylated polystyrene of claim 1, wherein the polystyrene is from about 5 to about 8 percent crosslinked.

5. The biocidal methylated polystyrene of claim 1, wherein the methylated polystyrene is a chloromethylated polystyrene.

6. The biocidal methylated polystyrene of claim 1, wherein the biocidal methylated polystyrene is chlorinated to at least 6% Cl in an aqueous base.

7. A polymer having a repeating unit, said unit having the formula:

8. The polymer of claim 7, it wherein R₁ and R₂ are methyl.

9. The polymer of claim 7, wherein the methylated polystyrene is a chloromethylated polystyrene.

21. The polymer of claim 7, wherein the polymer is chlorinated to at least 6% Cl in an aqueous base.

10. A biocidal polystyrene having a hydantoin group bonded from a first nitrogen atom to at least some of the benzene rings of the polystyrene via a methylene group pendant on a carbon atom of each benzene ring to which a hydantoin group is attached, wherein said polystyrene is prepared from a porous methylated polystyrene that is at least 3% crosslinked, and a chlorine or bromine atom is bonded to a second nitrogen atom of a hydantoin group.

11. The biocidal polystyrene of claim 10, wherein the methylated polystyrene is a chloromethylated polystyrene.

12. The biocidal polystyrene of claim 10, wherein the biocidal methylated polystyrene is chlorinated to at least 6% Cl in an aqueous base.

13. A bead comprising a crosslinked polystyrene polymer having a repeating unit having the formula:

14. The bead of claim 13, wherein R₁ and R₂ are methyl.

15. The bead of claim 13, wherein X is chlorine.

16. The bead of claim 13, wherein X is bromine.

17. The bead of claim 13, wherein R₁ and R₂ are methyl and X is chlorine.

18. The bead of claim 13, wherein R₁ and R₂ are methyl and X is bromine.

19. The bead of claim 13, wherein the methylated polystyrene is a chloromethylated polystyrene.

20. The bead of claim 13, wherein the bead is chlorinated to at least 6% Cl in an aqueous base.