Double dipped gloves

Abstract

A method of making a glove is described. The method comprises dipping a glove form into two different formulations. Each formulation comprises a carboxylated nitrile butadiene rubber with different amounts of covalent and ionic cross linkers. The gloves preferably have a stress retention value of greater than 50%.

1 . A glove, comprising:
 a first layer formed from a first composition comprising a first nitrile butadiene rubber; and   a second layer formed from a second composition comprising a second nitrile butadiene rubber;   wherein the glove exhibits a stress retention of greater than 50%, said stress retention being the percentage retention of the initial stress after six minutes at 100% extension of the glove.   
   
   
       2 . The glove of  claim 1 , wherein the stress retention ranges from greater than 50% to about 70%. 
   
   
       3 . The glove of  claim 1  wherein either or both of the first nitrile butadiene rubber and the second nitrile butadiene rubber is carboxylated. 
   
   
       4 . The glove of  claim 1 , wherein either or both of the first composition and the second composition further comprises a metal oxide. 
   
   
       5 . The glove of  claim 4 , wherein the metal oxide is at least one selected from the group consisting of magnesium oxide, lead oxide, and zinc oxide. 
   
   
       6 . The glove of  claim 4 , wherein the metal oxide is zinc oxide. 
   
   
       7 . The glove of  claim 1 , wherein either or both of at least one selected from the first composition and the second composition comprises a covalent cross linking agent. 
   
   
       8 . The glove of  claim 7 , wherein the covalent cross linking agent is selected from the group consisting of sulfur, a sulfur-donor compound, and a peroxide compound. 
   
   
       9 . The glove of  claim 7 , wherein either or both of the at least one selected from the first composition and the second composition further comprises a metal oxide. 
   
   
       10 . The glove of  claim 9 , wherein the metal oxide is one selected from the group consisting of magnesium oxide, lead oxide, and zinc oxide. 
   
   
       11 . The glove of  claim 1 , wherein the first composition comprises zinc oxide present in an amount not more than about 0.1 parts per 100 parts of the first nitrile butadiene rubber. 
   
   
       12 . The glove of  claim 11 , wherein the amount of zinc oxide present in the first composition ranges from about 0.03 to about 0.08 parts per 100 parts of the first nitrile butadiene rubber. 
   
   
       13 . The glove of  claim 11 , wherein the second composition comprises zinc oxide present in an amount that is at least about 1.0 parts per 100 parts of the second nitrile butadiene rubber. 
   
   
       14 . The glove of  claim 13  wherein the amount of zinc oxide present in the second composition ranges from about 1.0 to about 1.2 parts per 100 parts of the second nitrile butadiene rubber. 
   
   
       15 . The glove of  claim 1 , wherein the first composition comprises zinc oxide, the second composition comprises zinc oxide, the amount of zinc oxide present in the first composition is less than the amount of zinc oxide present in the second composition, and the first layer comprises a skin contacting surface for contacting a hand of a wearer of the glove. 
   
   
       16 . The glove of  claim 1 , wherein the glove has a tensile strength of from about 15 MPa to about 25 MPa. 
   
   
       17 . The glove of  claim 1 , wherein the first nitrile butadiene rubber composition differs from the second nitrile rubber butadiene composition. 
   
   
       18 . The glove of  claim 1 , wherein the first composition comprises a cross-linking agent, the second composition comprises the cross-linking agent, and the amount of the cross-linking agent present in the first composition is less than the amount of the cross-linking agent present in the second composition. 
   
   
       19 . The glove of  claim 18 , wherein the cross-linking agent is an ionic cross-linking agent, the first composition further comprises a first amount of a covalent cross-linking agent, the second composition further comprises a second amount of the covalent cross-linking agent, and the first amount of the covalent cross-linking agent present in the first composition is less than the second amount of the covalent cross-linking agent present in the second composition. 
   
   
       20 . The glove of  claim 18  consisting of two layers, wherein the first layer is formed from the first composition, and the second layer is formed from the second composition.