Method of making a multilayered elastomeric article
Elastomeric articles, such as gloves, made from more than one layer, are provided. The gloves can include a first (grip side) layer in which a first colorant is compounded or integrated and a second (donning side) layer in which a second colorant is compounded or integrated. Alternatively, the gloves can include a translucent first layer and a second layer in which a colorant is compounded or integrated. Either arrangement can enable a breach of the first layer to be more easily detected, either due to the high level of contrast between the first layer and the second when a first colorant and a second colorant are utilized, or due to the translucence of the first layer as compared to the donning side layer, where the intensity of the second layer is increased upon a breach of the translucent first layer.
1. A method of making a multilayered elastomeric article, the method comprising:
a) dipping a mold into a first solution comprising a first powder free coagulant, wherein the first powder free coagulant includes a first metallic salt;
b) dipping the mold into a first elastomeric formulation comprising a first elastomeric material to form a first layer;
c) dipping the mold into a second elastomeric formulation comprising a second elastomeric material to form a second layer, wherein the second layer includes a second elastomeric material compounded with a second colored pigment and titanium dioxide, wherein the ratio of the parts of titanium dioxide to the parts of the second colored pigment ranges from about 0.25 to about 3; and
d) curing the first elastomeric formulation and the second elastomeric formulation to form the multilayered elastomeric article, wherein a sufficient level of contrast exists between the first layer and the second layer to detect a breach of the first layer.
2. The method of claim 1 , wherein the first metallic salt is present in an amount ranging from about 3 wt. % to about 22 wt. % based on the total wt. % of the solution.
3. The method of claim 1 , further comprising dipping the mold into a second solution comprising a second powder free coagulant, wherein the second powder free coagulant includes a second metallic salt prior to dipping the mold into the second elastomeric formulation.
4. The method of claim 3 , wherein the first metallic salt is present in an amount ranging from about 6 wt. % to about 14 wt. % based on the total wt. % of the first solution and the second metallic salt is present in an amount ranging from about 3 wt. % to about 22 wt. % based on the total wt. % of the second solution.
5. The method of claim 3 , wherein a dip time for the second elastomeric formulation is about 10% to about 90% shorter than a dip time for the first elastomeric formulation.
6. The method of claim 1 , wherein the first elastomeric material is compounded with a first colored pigment.
7. The method of claim 6 , wherein the first colored pigment is compounded into the first layer in an amount ranging from about 0.25 parts to about 5 parts based on 100 dry parts of the first elastomeric material.
8. The method of claim 1 , wherein the second colored pigment is compounded into the second layer in an amount ranging from about 0.5 parts to about 15 parts based on 100 dry parts of the second elastomeric material.
9. The method of claim 1 , wherein the first elastomeric material includes polyurethane, nitrile rubber, styrene-butadiene rubber, isobutylene-isoprene rubber, polychloroprene, polyisoprene, natural rubber, or a combination thereof and wherein the second elastomeric material includes polyurethane, nitrile rubber, styrene-butadiene rubber, isobutylene-isoprene rubber, polychloroprene, polyisoprene, natural rubber, or a combination thereof.
10. The method of claim 9 , wherein the first elastomeric material and the second elastomeric material each include nitrile rubber.
11. The method of claim 10 , wherein the nitrile rubber in the first elastomeric material, the second elastomeric material, or both is compounded with an alkali agent, a metal oxide, a sulfur crosslinking agent, and a vulcanization accelerator.
12. The method of claim 1 , wherein the elastomeric article is a glove, further wherein the first layer defines a grip side layer of the glove and the second layer defines a donning side layer of the glove.
13. The method of claim 12 , wherein the glove has a palm region thickness ranging from about 0.01 millimeters to about 6 millimeters.
14. The method of claim 1 , wherein the titanium dioxide is present in the second layer in an amount ranging from about 0.25 parts to about 30 parts based on 100 dry parts of the second elastomeric material.
15. The method of claim 1 , wherein the first layer is darker than the second layer, wherein the first layer and the second layer exhibit a ΔE* color difference greater than about 2.5 as determined according to the Commission Internationale de l′Eclairage (CIE) 1976 standard.
16. The method of claim 1 , wherein the second layer exhibits a saturation level of greater than about 25%.
17. The method of claim 1 , wherein the second layer exhibits a value level of greater than about 25%.
18. The method of claim 1 , wherein a dip time for the second elastomeric formulation is about 40% to about 100% longer than a dip time for the first elastomeric formulation.