Elastomeric articles having a welded seam that possess strength and elasticity
View Patent ↗Elastomeric articles, such as gloves, are described that are made by welding two polymer films together. Polymer films are selected that have excellent elastic properties in combination with tensile strength properties. For instance, the polymer films can be made from a thermoplastic elastomer that has a tensile strength of greater than 40 MPa and has a modulus of from about 2 MPA to about 20 MPa.
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 being welded to the first hand-shaped panel about the peripheries in a manner that forms a hollow opening for receiving a hand, the first hand-shaped panel and the second hand-shaped panel being comprised of a film containing an elastomeric polymer, the first hand-shaped panel and the second hand-shaped panel having a thickness of less than about 8 mils, the first hand-shaped panel and the second hand-shaped panel having a tensile strength of at least about 40 MPa and having a modulus of from about 2 MPa to about 25 MPa.
2. A glove as defined in claim 1 , wherein the film has a hysteresis loss after being stretched to 250% elongation of less than about 100% and has a percent set of less than about 95%.
3. A glove as defined in claim 1 , wherein the film has a hysteresis loss after being stretched to 250% elongation of less than about 80% and has a percent set of less than about 80%.
4. A glove as defined in claim 1 , wherein the film has a hysteresis loss after being stretched to 250% elongation of less than about 50%.
5. A glove as defined in claim 1 , wherein the film has a percent set after being stretched to 250% elongation of less than about 50%.
6. A glove as defined in claim 1 , wherein the film comprises a friction-reducing additive such that an inside surface of the glove has a static coefficient of friction of less about 0.3.
7. A glove as defined in claim 1 , wherein the first hand-shaped panel and the second hand-shaped panel have a modulus of from about 2 MPa to about 10 MPa.
8. A glove as defined in claim 1 , wherein the first hand-shaped panel and the second hand-shaped panel comprise a single ply film that is not laminated to any other material layers.
9. A glove as defined in claim 1 , wherein the first hand-shaped panel and the second hand-shaped panel are formed from a film made from the same elastomeric polymer.
10. A glove as defined in claim 1 , wherein the first hand-shaped panel is welded to the second hand-shaped panel by thermally bonding the first hand-shaped panel and the second hand-shaped panel together.
11. A glove as defined in claim 1 , wherein the first hand-shaped panel is welded to the second hand-shaped panel by ultrasonically bonding the first hand-shaped panel and the second hand-shaped panel together.
12. A glove as defined in claim 1 , wherein the elastomeric polymer comprises a thermoplastic polyurethane elastomer.
13. A glove as defined in claim 1 , wherein the first hand-shaped panel and the second hand-shaped panel have a tensile strength of at least about 60 MPa and has a modulus of from about 5 MPa to about 10 MPa.
14. A glove as defined in claim 1 , wherein the first hand-shaped panel and the second hand-shaped panel are formed from cast films.
15. A glove as defined in claim 1 , wherein the first hand-shaped panel and the second hand-shaped panel are formed from blown films.
16. A glove as defined in claim 1 , wherein the first hand-shaped panel and the second hand-shaped panel do not contain a natural rubber latex, a nitrile polymer, a polychloroprene polymer or an isoprene polymer.
17. A glove as defined in claim 1 , wherein the elastomeric polymer comprises a polyolefin plastomer or a styrenic block copolymer.
18. A glove as defined in claim 12 , wherein the thermoplastic polyurethane elastomer is polyether-based.
19. A glove as defined in claim 12 , wherein the thermoplastic polyurethane elastomer includes polymethylene-based soft blocks.
20. A glove as defined in claim 12 , wherein the thermoplastic polyurethane elastomer is polyester-based.
21. A glove as defined in claim 1 , wherein the elastomeric polymer comprises a polyolefin elastomer.
22. A glove as defined in claim 1 , wherein the elastomeric polymer comprises an alpha olefin copolymer.
23. A glove as defined in claim 1 , wherein the elastomeric polymer comprises a styrenic block copolymer.
24. A glove as defined in claim 1 , wherein the elastomeric polymer comprises a styrene-ethylene butylene-styrene block copolymer.