US2010029797A1PendingUtilityA1

Biocidal particles of methylated polystyrene

61
Assignee: UNIV AUBURNPriority: Oct 31, 2002Filed: Oct 5, 2009Published: Feb 4, 2010
Est. expiryOct 31, 2022(expired)· nominal 20-yr term from priority
Inventors:Shelby D. WorleyYongjun Chen
C08F 8/30A01N 59/00A01N 25/00C08F 8/02
61
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Claims

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

exact text as granted — not AI-modified
1 . A method of making a crosslinked and porous methylated polystyrene bead, comprising:
 reacting an insoluble functionalized crosslinked and porous methylated polystyrene bead with a N-halamine precursor and an alkali metal base to produce a crosslinked and porous methylated polystyrene bead having pendant N-halamine precursor groups, wherein the reaction is performed heterogeneously in a medium.   
   
   
       2 . The method of  claim 1 , wherein the functionalized methylated polystyrene bead is a crosslinked poly(chloromethyl)styrene. 
   
   
       3 . The method of  claim 1 , wherein the N-halamine precursor is a hydantoin, an imidazolidinone, an oxazolidinone, or an isocyanurate. 
   
   
       4 . The method of  claim 1 , wherein said reacting occurs for from about 12 to about 96 hours at a temperature of from about 70° to about 120° C. 
   
   
       5 . The method of  claim 1 , further comprising halogenating the crosslinked and porous methylated polystyrene bead having pendant N-halamine precursor groups to produce a biocidal crosslinked and porous methylated polystyrene bead having pendant N-halamine groups. 
   
   
       6 . The method of  claim 1 , wherein the alkali metal base is an alkali metal carbonate. 
   
   
       7 . The method of  claim 1 , wherein the alkali metal base is an alkali metal hydroxide. 
   
   
       8 . The method of  claim 1 , wherein the alkali metal base is an alkali metal hydride. 
   
   
       9 . The method of  claim 1 , wherein the alkali metal is sodium or potassium. 
   
   
       10 . The method of  claim 1 , wherein said medium is dimethylformamide. 
   
   
       11 . The method of  claim 1 , wherein said medium is dimethylsulfoxide. 
   
   
       12 . A method for making a crosslinked and porous methylated polystyrene bead, comprising:
 reacting a N-halamine precursor with an alkali metal base to produce an alkali metal salt of the N-halamine precursor; and   reacting the alkali metal salt of the N-halamine precursor with an insoluble functionalized crosslinked and porous methylated polystyrene bead to produce a crosslinked and porous methylated polystyrene bead having pendant N-halamine precursor groups, wherein the reaction with the functionalized crosslinked and porous methylated polystyrene bead is performed heterogeneously in a medium.   
   
   
       13 . The method of  claim 12 , wherein the functionalized methylated polystyrene bead is a crosslinked poly(chloromethyl)styrene. 
   
   
       14 . The method of  claim 12 , wherein the N-halamine precursor is a hydantoin, an imidazolidinone, an oxazolidinone, or an isocyanurate. 
   
   
       15 . The method of  claim 12 , wherein said reacting of the N-halamine precursor with the alkali metal base occurs for from about 15 minutes to about 2 hours at a temperature of from about 25 to about 100° C. 
   
   
       16 . The method of  claim 12 , wherein said reacting of the alkali metal salt with the functionalized crosslinked and porous methylated polystyrene bead occurs for from about 4 to about 96 hours at a temperature of from about 70° to about 120° C. 
   
   
       17 . The method of  claim 12  further comprising halogenating the crosslinked and porous methylated polystyrene bead having pendant N-halamine precursor groups to produce a biocidal crosslinked and porous methylated polystyrene bead having pendant N-halamine groups. 
   
   
       18 . The method of  claim 12 , wherein the alkali metal base is an alkali metal carbonate. 
   
   
       19 . The method of  claim 12 , wherein the alkali metal base is an alkali metal hydroxide. 
   
   
       20 . The method of  claim 12 , wherein the alkali metal base is an alkali metal hydride. 
   
   
       21 . The method of  claim 12 , wherein the alkali metal is sodium or potassium. 
   
   
       22 . The method of  claim 12 , wherein said medium is dimethylformamide. 
   
   
       23 . The method of  claim 12 , wherein said medium is dimethylsulfoxide.

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