Inkjet compositions and processes for stretchable substrates
Novel inkjet ink compositions for forming an image in a form of an elastic film attached to a surface of a stretchable and/or flexible substrate and processes utilizing same for inkjet printing color images on various substrates such as colored and absorptive or impregnable stretchable materials, which are characterized by heightened efficiency in process time, ink and energy consumption, as well as products having durable, wash-fast and abrasion-fast images printed thereon by the process, are disclosed. The novel ink compositions comprise a first part, which contains a property-adjusting agent and a carrier, and a second part which contains an emulsified property-sensitive proto-elastomeric film-forming agent, a colorant and a carrier, such that the second part congeals upon contact with the property-adjusting agent. The second part is digitally applied to the substrate less than 1 second following the application of the first part to the substrate.
1. A property-sensitive proto-elastomeric film-forming inkjet composition comprising an emulsified proto-elastomeric film-forming agent characterized by a glass transition temperature (Tg) that ranges from −35° C. to 0° C., a dispersant, a dispersed pigment, a property-sensitive agent and a second carrier, wherein said emulsified proto-elastomeric film-forming agent comprises a polyurethane, said property-sensitive agent is sensitive to a change in a chemical and/or physical property, such that upon effecting said change, the property-sensitive proto-elastomeric film-forming inkjet composition congeals, and upon curing forms an elastic film which is characterized by a glass transition temperature (Tg) that ranges from −35° C. to 0° C.
2. The inkjet composition of claim 1 , being for forming an image in a form of said elastic film attached to a surface of a stretchable and/or flexible substrate.
3. The inkjet composition of claim 1 , wherein said proto-elastomeric film-forming agent further comprises an acrylic polymer selected from the group consisting of an alkyl-acrylic polymer, acrylic-styrene copolymer, an alkyl-acrylic copolymer, and/or any combination, emulsion or salt thereof.
4. The inkjet composition of claim 1 , wherein said dispersant is a property-sensitive polymerizable dispersant.
5. The inkjet composition of claim 4 , wherein said dispersant is selected from the group consisting of an acrylate, an acrylic acid salt, an acrylic polymer salt and any combination thereof.
6. The inkjet composition of claim 1 , wherein said first carrier is an aqueous carrier.
7. The inkjet composition of claim 1 , wherein said second carrier is an aqueous carrier.
8. The inkjet composition of claim 1 , further comprising a first metal oxide.
9. The inkjet composition of claim 8 , wherein said first metal oxide is substantially transparent.
10. The inkjet composition of claim 1 , further comprising at least one agent selected from the group consisting of a binder, a film-forming binder, a polymerization catalyst, a crosslinking agent, an amine stabilizer, an alcohol stabilizer, a softener/plasticizer, a surface active agent, a surface tension modifying agent, a viscosity modifying agent, a thickener agent, an anticorrosion agent and any combination thereof.
11. The inkjet composition of claim 10 , wherein said crosslinking agent is a formaldehyde-free crosslinking agent.
12. The inkjet composition of claim 1 , wherein said change is effected upon contacting the inkjet composition with an immobilization composition, said immobilization composition further comprises at least one agent selected from the group consisting of a binder, a film-forming binder, a polymerization catalyst, a crosslinking agent, an amine stabilizer, an alcohol stabilizer, a softener/plasticizer, a surface active agent, a surface tension modifying agent, a viscosity modifying agent, a thickener agent, an anticorrosion agent and any combination thereof.
13. The inkjet composition of claim 1 , wherein said change is effected upon contacting the inkjet composition with an immobilization composition, and said immobilization composition comprises a transitory organic acid and/or a first metal oxide and said second carrier is water.
14. The inkjet composition of claim 13 , wherein said emulsified proto-elastomeric film-forming agent is a pH-sensitive and/or metal oxide-sensitive polyurethane, and wherein the property-sensitive proto-elastomeric film-forming inkjet composition congeals upon contact with said acid and/or said first metal oxide.