Dip Molding Emulsion and Glove

Abstract

Provided is, a glove production method including: (1) the step of immersing a glove forming mold in a liquid coagulant containing calcium ions so as to allow the coagulant to adhere to the glove forming mold; (2) the dispersion step of leaving a dip molding composition to stand with stirring; (3) the dipping step; (4) the gelling step; (5) the leaching step; (6) the beading step; (7) the precuring step; and (8) the curing step, in which method the steps (3) to (8) are performed in the order mentioned, and the dip molding composition has a specific formulation.

1 . A dip molding emulsion comprising, at least:
 an elastomer that contains a (meth)acrylonitrile-derived structural unit, an unsaturated carboxylic acid-derived structural unit, and a butadiene-derived structural unit in a polymer main chain;   a polycarbodiimide crosslinker molecules;   a pH adjuster for the polycarbodiimide crosslinker molecules comprising an alkali metal hydroxide; and   water, wherein   the elastomer contains the (meth)acrylonitrile-derived structural unit in an amount of 20% by weight to 40% by weight, the unsaturated carboxylic acid-derived structural unit in an amount of 1% by weight to 10% by weight, and the butadiene-derived structural unit in an amount of 50% by weight to 75% by weight,   the polycarbodiimide crosslinker molecules comprise at least one polycarbodiimide containing a hydrophilic segment in its molecular structure, and is added in an amount of larger than 0.2% by weight but 4.0% by weight or less with respect to a total solid content of the dip molding emulsion,   a number-average molecular weight of the polycarbodiimide is from 500 to 5000, and   the dip molding emulsion has a pH of 9.5 to 10.5.   
     
     
         2 . The dip molding emulsion according to  claim 1 , comprising zinc oxide and/or an aluminum complex as a metal crosslinking agent in an amount of 0.2% by weight to 7.0% by weight with respect to the total solid content of the dip molding emulsion. 
     
     
         3 . The dip molding emulsion according to  claim 1 , wherein the alkali metal hydroxide is potassium hydroxide. 
     
     
         4 . The dip molding emulsion according to  claim 1 , wherein the number of carbodiimide functional groups is 5 or more per molecule of the polycarbodiimide, and micelles formed from the polycarbodiimide have an average particle size of 5 nm to 30 nm. 
     
     
         5 . The dip molding emulsion according to  claim 1 , wherein the polycarbodiimide crosslinker molecules comprise at least one polycarbodiimide containing a hydrophilic segment at at least one end of the polycarbodiimide molecules. 
     
     
         6 . A glove formed by curing the dip molding emulsion according to  claim 1 .