Elastomeric articles having a welded seam made from a multi-layer film
View Patent ↗Elastomeric articles, such as gloves, are made by welding together two plies of a multi-layer film. The film plies are welded together through ultrasonic bonding, thermal bonding, or mixtures thereof. The multi-layer film includes at least three layers that, in one embodiment, are coextruded. Each layer of the multi-layer film is made from a different composition that produces layers having different properties.
1. A glove comprising:
a first hand-shaped panel defining a periphery;
a second hand-shaped panel also defining a periphery, the second hand-shaped panel having been welded to the first hand-shaped panel about the peripheries of the hand-shaped panels in a manner that forms a hollow opening for receiving a hand, the glove including a seam where the first hand-shaped panel has been welded to the second hand-shaped panel, the hand-shaped panels each being comprised of a non-laminated, elastic multi-layer film having three layers, the multi-layer film comprising a middle layer positioned in between a first layer and a second layer wherein the middle layer has a thickness that is greater than a thickness of the first layer and the thickness of the middle layer is greater than a thickness of the second layer, the first layer of each hand-shaped panel forming an exterior surface of the glove, the second layer of each hand-shaped panel forming an interior surface of the glove, and wherein the non-laminated, elastic multi-layer film is made from a thermoplastic elastomer such that the middle layer, the first layer, and the second layer are all made from the same thermoplastic elastomer, and wherein although each layer contains the same thermoplastic elastomer, each layer of the multi-layer film includes a different composition of ingredients, the second layer being different than the middle layer by the second layer containing a friction-reducing additive, the friction-reducing additive comprising filler particles present in the second layer sufficient so that the second layer has a static coefficient of friction of 0.3 or less, the first layer being different than the middle layer by the first layer containing a gripping or anti-blocking agent, the first layer containing the thermoplastic elastomer combined with the gripping or anti-blocking agent, the second layer comprising the thermoplastic elastomer combined with the friction-reducing additive comprising the filler particles, the multi-layer film having a total thickness of 8 mils or less.
2. A glove as defined in claim 1 , wherein the thermoplastic elastomer that is used to form the first layer, the middle layer and the second layer comprises a thermoplastic polyurethane elastomer.
3. A glove as defined in claim 2 , wherein the thermoplastic polyurethane elastomer includes polymethylene-based soft segments.
4. a glove as defined in claim 2 , wherein the thermoplastic polyurethane elastomer is polyether-based.
5. a glove as defined in claim 2 , wherein the thermoplastic polyurethane elastomer is polyester-based.
6. A glove as defined in claim 2 , wherein the thermoplastic polyurethane elastomer has a density of from 1.0 to 1.2 grams/centimeter 3 and has a Shore A hardness of from 86 to 94.
7. A glove as defined in claim 1 , wherein the total thickness of the multi-layer film is 6 mils or less.
8. A glove as defined in claim 1 , wherein the friction-reducing additive is contained in the second layer in an amount from 15% to 50% by weight.
9. A glove as defined in claim 1 , wherein the friction-reducing additive contained in the second layer comprises particles, the particles being present in the second layer in an amount from 20% to 40% by weight and wherein the particles have a particle size of from 2 microns to 10 microns.
10. A glove as defined in claim 1 , wherein the gripping or anti-blocking agent is present in the first layer in an amount from 5% to 15% by weight.
11. A glove as defined in claim 10 , wherein the gripping or anti-blocking agent comprises filler particles.
12. A glove as defined in claim 1 , wherein each layer of the multi-layer film has a hysteresis loss after being stretched to 250% elongation of 100% or less and has a percent set of 95% or less.
13. A glove as defined in claim 1 , wherein the glove contains a coloring agent, the coloring agent being located in the first layer of the multi-layer film.
14. A glove as defined in claim 1 , wherein the second layer contains a coloring agent comprising white pigment particles.
15. A glove as defined in claim 14 , wherein the first layer contains a second coloring agent, the first layer being translucent.
16. A glove as defined in claim 1 , wherein the first layer contains an antistatic agent.
17. A glove as defined in claim 1 , wherein the friction-reducing additive of each of the first and second layers comprises oxide particles.