Elastomeric films and gloves
There is disclosed a composition for producing an elastomeric film comprising: a synthetic polymer, sulphur, and a metal-oxide cross-linking agent. The concentration of the total solids in the composition is between 5-20% by weight of the composition. Also disclosed is a multiple-coating method of manufacturing an elastomeric film comprising the steps of: (i) providing a composition comprising a synthetic polymer, a cross linking agent, wherein the concentration of the total solids in the composition is between 5-20% by weight of the composition, (ii) contacting the composition with a mold to form a layer of composition on the mold, (iii) contacting the layer of composition on the mold with a further amount of the composition to form a further layer, (iv) drying the composition, and (v) curing the composition.
1. A composition for producing an elastomeric film comprising:
a synthetic polymer,
sulphur, and
a metal-oxide cross-linking agent,
wherein the concentration of the total solids in the composition is from 5 to 20% by weight of the composition, the amount of cross-linking agent in the composition in the absence of accelerators is from 0.8 to 1.6 phr.
2. The composition according to claim 1 , wherein the synthetic polymer is selected from one or a mixture of polymers from the group consisting of carboxylated polyacrylonitrile butadiene, polyisoprene, polychloroprene and/or polyurethane.
3. The composition according to claim 2 , wherein the synthetic polymer is carboxylated polyacrylonitrile butadiene.
4. The composition according to claim 1 , wherein the metal-oxide cross-linking agent is a divalent metal-oxide.
5. The composition according to claim 4 , wherein the divalent metal-oxide is selected from one or a mixture of agents from the group consisting of lead oxide, magnesium oxide, barium oxide and zinc oxide.
6. The composition according to claim 5 , wherein the metal oxide is zinc oxide.
7. The composition according to claim 1 , wherein the amount of cross-linking agent in the composition is from 0.8 to 1.2 phr.
8. The composition according to claim 1 , wherein the amount of sulphur is from 0.01 to 0.5 phr.
9. A method of manufacturing the elastomeric film according to claim 1 , comprising the steps of:
(i) dipping a mould into the composition to produce a layer of elastomeric film composition on the mould, and
(ii) drying and curing the elastomeric film composition.
10. The method of claim 9 , further comprising, prior to step (i), the steps of:
(a) dipping the mould into a coagulant containing calcium ions at a concentration of from 1% to 10% by weight, followed by
(b) drying or partially drying the coagulant-dipped mould.
11. Synthetic glove(s) made from layered elastomeric film comprising layers of the composition according to claim 1 , wherein the composition is cured and the average thickness of the elastomeric film is from about 0.01 to about 0.3 mm.
12. The synthetic glove(s) according to claim 11 , wherein the average thickness of the elastomeric film is from about 0.05 to about 0.10 mm.