Polymeric compositions comprising polyisoprene

Abstract

A glove, including a polymeric, elastomeric, or latex composition, having a water-based emulsion of a polyisoprene polymer; a first accelerator comprising at least one of a thiourea, a benzothiazole sulphenamide, a thiazole, or a dialkyl dithiocarbamate, or combinations thereof, a second accelerator comprising a thiuram or a xanthogen, or a combination thereof, at least one anti-oxidant, at least one vulcanizing agent; and an activator, wherein a total amount of the first accelerator and the second accelerator ranges from 0.2 to 2.5 PHR of the polymeric, elastomeric, or latex composition and the polymeric, elastomeric, or latex composition is substantially free of diphenyl guanidine and/or casein.

What is claimed is: 
     
         1 . A glove, comprising:
 a polymeric, elastomeric, or latex composition, comprising:
 a water-based emulsion of a polyisoprene polymer; 
 a first accelerator comprising at least one of a thiourea, a benzothiazole sulphenamide, a thiazole, or a dialkyl dithiocarbamate, or combinations thereof; 
 a second accelerator comprising a thiuram or a xanthogen, or a combination thereof; 
 at least one anti-oxidant; 
 at least one vulcanizing agent; and 
 an activator; 
   wherein a total amount of the first accelerator and the second accelerator ranges from 0.2 to 2.5 PHR of the polymeric, elastomeric, or latex composition and the polymeric, elastomeric, or latex composition is substantially free of diphenyl guanidine and/or casein.   
     
     
         2 . The glove of  claim 1 , wherein the glove is a powder-free glove. 
     
     
         3 . The glove of  claim 1 , wherein the dialkyl dithiocarbamate is at least one of sodium dimethyldithiocarbamate, zinc dimethyldithiocarbamate, zinc diethyl dithiocarbamate, zinc dibutyldithiocarbamate, sodium diethyldithiocarbamate, sodium dibutyldithiocarbamate, zinc dibenzyldithiocarbamate or combinations thereof. 
     
     
         4 . The glove of  claim 1 , wherein the thiuram is at least one of tetramethyl thiuramdisulfide, tetraethyl thiuramdisulfide, tetrabutyl thiuramdisulfide, dipentamethylene thiuramtetrasulfide or combinations thereof. 
     
     
         5 . The glove of  claim 1 , wherein the xanthogen is diisopropyl xanthogen polysulfide, dihydrocarbyl xanthogen polysulfide, dibutyl xanthogen polysulfide, or combinations thereof. 
     
     
         6 . The glove of  claim 1 , wherein the thiazole is mercaptobenzothiazole, zinc mercaptobenzothiazole, dibenzothiazyl disulphide, or combinations thereof. 
     
     
         7 . The glove of  claim 1 , wherein the benzothiazole sulphenamide is N-cyclohexyl sulphenamido-2-benzothiazole, N-tert-butyl sulphenamide-2-benzothiazole (TBBS), N-morpholino-thio-2-benzothiazole, or combinations thereof. 
     
     
         8 . The glove of  claim 1 , wherein the thiourea is N,N′-diphenyl thiourea (DPTU), N-phenyl-N-cyclohexylthiourea, N-phenyl-N-alpha-phenylethylthiourea, N-phenyl-N′-ethylthiourea, N-para-methoxyphenyl N′-ethylthiourea, or combinations thereof. 
     
     
         9 . The glove of  claim 1 , further comprising a natural polyisoprene, a synthetic cis 1,4-polyisoprene, a carboxylated acrylonitrile butadiene, a non-carboxylated acrylonitrile butadiene, a nitrile-butadiene, a polychloroprene, polyvinyls, a butyl latex, a styrene-butadiene (SBR), a styrene-butadiene latex, a styrene-isoprene-styrene (SIS), a styrene-ethylene/butylene-styrene (SEBS), a styrene-acrylonitrile (SAN), a polyethylene-propylene-diene, a water-based polyurethane, a solvent-based polyurethane, or blends thereof. 
     
     
         10 . The glove of  claim 1 , wherein the polymeric, elastomeric, or latex composition comprises approximately 0.2 PHR DPTU and approximately 0.2 to 0.4 PHR TBBS. 
     
     
         11 . The glove of  claim 2  wherein the at least one glove, coating for a glove, or condom has an unaged ultimate tensile strength of at least 20 MPa and/or aged ultimate tensile strength of at least 18 MPa after accelerated aging at 70° C. for 7 days, and a minimum tear strength of 25 N/mm. 
     
     
         12 . A method for compounding a polymeric, elastomeric, or latex composition substantially free of diphenyl guanidine and casein, comprising:
 stirring a polyisoprene material and sulfur to form a mixture;   stirring a stabilizer into the mixture;   heating the stabilizer and mixture;   stirring an accelerator mixture comprising between 0.2 PHR to approximately 2.5 PHR total of the polymeric, elastomeric, or latex composition into the mixture;   stirring an activator into the mixture; and   stirring an anti-oxidant in the mixture, wherein a polymeric, elastomeric, or latex composition substantially free of diphenyl guanidine and casein is formed.   
     
     
         13 . The method of  claim 12 , further comprising a step for delivering a thiuram accelerator into the diphenyl guanidine free and casein free polymeric, elastomeric, or latex composition. 
     
     
         14 . A method for making a polymeric, elastomeric, or latex article, comprising:
 dipping a former into a coagulant;   dipping the former into a polymeric, elastomeric, or latex composition, thereby disposing a polymeric, elastomeric, or latex coating onto the former;   dipping the polymeric, elastomeric, or latex coating into at least one of a weak acid or a strong coagulant; and   allowing the polymeric, elastomeric, or latex coating to dry, wherein the former is a hand shaped former or a condom former, thereby forming a powder-free unsupported glove or condom.   
     
     
         15 . The method of  claim 14 , wherein the polymeric, elastomeric, or latex composition further comprises a natural polyisoprene, a synthetic cis 1,4-polyisoprene, a carboxylated acrylonitrile butadiene, a non-carboxylated acrylonitrile butadiene, a nitrile-butadiene, a polychloroprene, polyvinyls, a butyl latex, a styrene-butadiene (SBR), a styrene-butadiene latex, a styrene-isoprene-styrene (SIS), a styrene-ethylene/butylene-styrene (SEBS), a styrene-acrylonitrile (SAN), a polyethylene-propylene-diene, a water-based polyurethane, a solvent-based polyurethane, or combinations or blends thereof. 
     
     
         16 . The method of  claim 14 , wherein the former is heated before the dipping step. 
     
     
         17 . The method of  claim 14 , further comprising a step of pre-vulcanizing the polymeric, elastomeric, or latex composition at a range of 20°-35° C. and achieving a required degree of crosslinking not faster than approximately 20 hours. 
     
     
         18 . The method of  claim 14 , further comprising a step of post-vulcanizing the powder-free unsupported glove or condom at a temperature range of 110°-150° C. 
     
     
         19 . The method of  claim 14 , further comprising a step for foaming the polymeric, elastomeric, or latex composition before the dipping the former into a polymeric, elastomeric, or latex composition. 
     
     
         20 . The method of  claim 14 , further comprising a step for dressing the former with a fabric liner before the dipping the former into a polymeric, elastomeric, or latex composition step, wherein the composition is thereby disposed on the fabric liner to form a supported article.