Process for producing glove having interpenetrating network structure

Abstract

A process for producing an elastomeric article having an interpenetrating network structure included the following steps. Firstly, a mold is contacted with an elastomeric composition. The elastomeric composition includes a base latex and a thermoplastic ethylene-vinylacetate (EVA) copolymer latex. The base latex includes a styrene-butadiene rubber (SBR) latex and a carboxylated styrene-butadiene rubber (C-SBR) latex, and the mixing ratio of the base latex to the EVA copolymer latex is from 95:5 to 40:60. Then, the elastomeric composition on the mold is allowed to perform a vulcanization reaction, thereby forming the elastomeric article having the interpenetrating network structure.

1 . A process for producing a glove having an interpenetrating network structure, comprising steps of: 
 contacting a mold with an elastomeric composition comprising a base latex and a thermoplastic ethylene-vinylacetate (EVA) copolymer latex, said base latex comprising a styrene-butadiene rubber (SBR) latex and a carboxylated styrene-butadiene rubber (C-SBR) latex and the mixing ratio of said base latex to said EVA copolymer latex being from 95:5 to 40:60; and    allowing said elastomeric composition on said mold to perform a vulcanization reaction, thereby forming said elastomeric article having said interpenetrating network structure.    
   
   
       2 . The process according to  claim 1  wherein said base latex comprises from 1% to 40% by mole of carboxylate group.  
   
   
       3 . The process according to  claim 2  wherein said base latex comprises from 5% to 20 % by mole of carboxylate group.  
   
   
       4 . The process according to  claim 1  wherein said elastomeric composition comprises at least one additive selected from a group consisting of activators, vulcanization agents, vulcanization accelerators, anti-aging agents, enforcement agents, fillers and additional latices.  
   
   
       5 . The process according to  claim 4  wherein said activator includes zinc oxides, in amount of from 1% to 10% by weight based on the total weight of said base latex and said EVA copolymer latex.  
   
   
       6 . The process according to  claim 4  wherein said vulcanization agent includes sulfur, organic sulfide and a combination thereof, in amount of from 0.1% to 2% by weight based on the total weight of said base latex and said EVA copolymer latex.  
   
   
       7 . The process according to  claim 4  wherein said vulcanization agent includes at least one selected from a group consisting of zinc N-ethyl-N-phenyldithiocarbamate, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, zinc dibutyldithiocarbamate, zinc mercaptobenzothiazole, tetramethyl disulfide and a combination thereof, in amount of from 0.5% to 10% by weight based on the total weight of said base latex and said EVA copolymer latex.  
   
   
       8 . The process according to  claim 4  wherein said anti-aging agent includes phenolic compounds or amine compounds, in amount of from 0.5% to 3% by weight based on the total weight of said base latex and said EVA copolymer latex.  
   
   
       9 . The process according to  claim 4  wherein said enforcement agent is a nano-scale enforcement agent including at least one selected from a group consisting of montmorillonite, mica, clay, bentonite, saponite, silica, titanium dioxide, potassium titanate whisker and a combination thereof, in amount of less than 20% by weight based on the total weight of said base latex and said EVA copolymer latex.  
   
   
       10 . The process according to  claim 4  wherein said additive includes at least one selected from a group consisting of photocatalyst, talcum powder, calcium carbonate, titanium dioxide, antistatic agent, far infrared-ray emitting agent, pigment and a combination thereof, in amount of less than 20% by weight based on the total weight of said base latex and said EVA copolymer latex.  
   
   
       11 . The process according to  claim 4  wherein said additional latices include aqueous polyurethane, aqueous nitrile rubber latex, acrylic resin latex and a combination thereof, in amount of less than 50% by weight based on the total weight of said base latex and said EVA copolymer latex.  
   
   
       12 . The process according to  claim 1  further comprising a step of immersing said mold into a solution of a coagulant selected from a group consisting of calcium nitrate, calcium chloride, alky ammonium and a combination thereof, before said step of contacting said mold with said elastomeric composition.  
   
   
       13 . The process according to  claim 1  further comprising a step of surface-treating said mold after said step of contacting said mold with said elastomeric composition and before said vulcanization reaction is performed.  
   
   
       14 . The process according to  claim 13  wherein said step of surface-treating said mold is performed by using a surface-treating agent comprising 10˜20% by weight of a synthesized resin, 10˜20% by weight of an acrylic-styrene resin, 1˜10% by weight of a silicon resin and the balance of water.  
   
   
       15 . A process for producing a glove having an interpenetrating network structure, comprising steps of: 
 contacting a mold with an elastomeric composition, wherein said elastomeric composition comprises:    100 weight parts of a latex mixture comprising a base latex and a thermoplastic ethylene-vinylacetate (EVA) copolymer latex, said base latex comprising a styrene-butadiene rubber (SBR) latex and a carboxylated styrene-butadiene rubber (C-SBR) latex and the mixing ratio of said base latex to said EVA copolymer latex being from 99:1 to 5:95;    1˜10 weight parts of an activator, based on the total weight of said latex mixture;    0.1˜2 weight parts of a vulcanization agent, based on the total weight of said latex mixture; and    0.5˜10 weight parts of a vulcanization accelerator, based on the total weight of said latex mixture; and    allowing said elastomeric composition on said mold to perform a vulcanization reaction, thereby forming said glove having said interpenetrating network structure.    
   
   
       16 . The process according to  claim 15  wherein said elastomeric composition further comprises: 
 0.5˜3 weight parts of an anti-aging agent, based on the total weight of said latex mixture;    optionally an enforcement agent less than 20 weight parts based on the total weight of said latex mixture;    optionally a filler less than 20 weight parts based on the total weight of said latex mixture; and    optionally additional latices less than 50 weight parts based on the total weight of said latex mixture.