Heat transfer materials and method of use thereof
View Patent ↗A heat transfer material kit is disclosed that includes a first image transfer material that includes a printable non-porous surface, and a second image transfer material that includes an outer layer having a film forming binder and thermoplastic particles. A method of using the kit is disclosed that includes the steps of a) imaging the substantially non-porous printable surface to form an imaged surface having printed and un-printed areas; b) positioning the outer layer adjacent the imaged surface; c) transferring a portion of the outer layer to the printed area while transferring a lesser portion of the outer layer to the non-printed area to form a coated imaged surface having a non-printed area with less coating than the printed area; and d) thereafter transferring the coated image to a substrate. Alternate methods of using the kit and applying images to substrates that provide good image appearance and durability are also disclosed.
1. A method of applying an image to a substrate, the method comprising
positioning a release sheet material adjacent to a transfer layer to form a laminate, wherein the release sheet material defines a printed area forming an image and a non-printed area, wherein the transfer layer overlies a base sheet to form a transfer sheet material, and wherein the transfer layer comprises a film-forming binder and thermoplastic particles;
heating the laminate in both the printed area and non-printed area causing the transfer layer to fuse to the release sheet material in the printed area forming a fused portion of the transfer layer, wherein transfer coating remains unfused in the non-printed area of the release sheet material;
separating the release sheet material and the fused portion of the transfer layer from the laminate to form an intermediary transfer material, wherein the fused portion of the transfer layer overlays the image on the intermediary transfer layer and the unfused, non-printed area of intermediary transfer material remain on the transfer sheet material;
positioning the intermediary transfer material so that the remaining fused portion of the transfer layer is adjacent to the substrate and the image is between the transfer layer and the release sheet material;
heating the intermediary transfer material to transfer the transfer layer and the image to the substrate; and
removing the release sheet material from the substrate so that the image is exposed on the substrate, wherein the image overlies the transfer layer and the transfer layer overlies the substrate.
2. A method as in claim 1 , wherein the substrate includes a fabric.
3. A method as in claim 1 , wherein the release sheet material comprises a release layer and a base layer, and wherein the image is formed on a surface of the release layer.
4. A method as in claim 3 , wherein the release sheet material further comprises a conformable layer positioned between the release layer and the base layer of the release sheet material.
5. A method as in claim 3 , wherein the release layer is coated on the base layer of the release sheet material.
6. A method as in claim 3 , wherein the release layer comprises a silicone polymer.
7. A method as in claim 3 , wherein the release layer comprises an acrylic polymer or co-polymer.
8. A method as in claim 7 , wherein the release layer comprises an acrylic copolymer of ethylene acrylic acid.
9. A method as in claim 3 , wherein the release layer comprises a crosslinked polymer.
10. A method as in claim 9 , wherein the crosslinked polymer is formed from a crosslinkable polymeric binder and a crosslinking agent.
11. A method as in claim 3 , wherein the release layer comprises a particulate material.
12. A method as in claim 11 , wherein the particulate material comprises clay particles.
13. A method as in claim 3 , wherein the release layer comprises polyethylene oxide.
14. A method as in claim 3 , wherein the release layer comprises a pH control agent.
15. A method as in claim 3 , wherein the release layer is substantially non-porous to inhibit penetration of the image into an underlying layer.
16. A method as in claim 1 , wherein the transfer sheet material further comprises a release layer positioned between the transfer layer and the base layer.
17. A method as in claim 1 , wherein the transfer layer comprises greater than 10% by weight of the film-forming binder and less than 90% by weight of the thermoplastic particles.
18. A method as in claim 1 , wherein the film-forming binder melts in the range of from 65° C. to 180° C.
19. A method as in claim 1 , wherein the film-forming binder melts in the range of from 80° C. to 120° C.
20. A method as in claim 1 , wherein the thermoplastic particles melt in the range of from 65° C. to 180° C.
21. A method as in claim 1 , wherein the thermoplastic particles melt in the range of from 80° C. to 120° C.
22. A method as in claim 1 , wherein the film-forming binder comprises an ethylene-acrylic acid copolymer.
23. A method as in claim 1 , wherein the thermoplastic particles comprise a polyamide.
24. A method as in claim 1 , wherein the thermoplastic particles comprise a polyester.
25. A method as in claim 1 , wherein the thermoplastic particles comprise an ethylene-vinyl acetate copolymer.
26. A method as in claim 1 , wherein the thermoplastic particles have a diameter of from 2 to 50 micrometers.
27. A method as in claim 1 , wherein the transfer layer further comprises an opacifier.
28. A method as in claim 1 further comprising printing the image onto a surface of the release sheet material.
29. A method as in claim 1 , wherein the step of transferring the transfer layer and the image to the substrate is performed by applying heat and pressure.