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. An inkjet composition comprising a proto-elastomeric film-forming agent or binder, a dispersed pigment, a property-sensitive agent and a carrier, wherein said property-sensitive agent is sensitive to an acidic pH such that upon contacting said acidic pH the inkjet composition congeals and subsequently forms a fully-cured elastic film upon drying/curing which is characterized by high wash-fastness, and an elongation percentage that ranges from 30% to 300%.
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 film-forming agent or binder is selected from the group consisting of an alkyl-acrylic polymer and/or an emulsion thereof, acrylic-styrene copolymer and/or an emulsion thereof, an alkyl-acrylic copolymer and/or an emulsion thereof, a urethane polymer and/or an emulsion thereof, and any combination 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 carrier is an aqueous carrier.
7. The inkjet composition of claim 1 , further comprising at least one agent selected from the group consisting of 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.
8. The inkjet composition of claim 7 , wherein said crosslinking agent is a formaldehyde-free crosslinking agent.
9. A multi-part inkjet composition, obtainable by contacting the inkjet composition of claim 1 with an immobilization composition, wherein said immobilization composition comprises a carrier and an acid.
10. An image in a form of a fully cured elastic film characterized by high wash-fastness, and an elongation percentage that ranges from 30% to 300% when attached to a surface of a stretchable and/or flexible substrate, obtainable by contacting, on the substrate, the inkjet composition of claim 1 with an immobilization composition, and optionally with a property-sensitive opaque underbase composition and/or optionally with a property-sensitive spot color composition, wherein said immobilization composition comprises a carrier and an acid.
11. A process of printing an image on a substrate, the process comprising concomitantly applying by means of an inkjet printing machine onto at least a portion of a surface of the substrate, an immobilization composition that comprises an acid, and the inkjet composition of claim 1 , and subsequently fully curing said inkjet composition on the substrate, wherein said immobilization composition and the inkjet composition are each applied by a separate and discrete component of said printing machine, thereby forming said image, and said image is in a form of an elastic film characterized by high wash-fastness, and an elongation percentage that ranges from 30% to 300%.
12. The process of claim 11 , wherein said applying is effected by spraying using a nozzle or by inkjet printing using a printhead.
13. The process of claim 11 , wherein a time interval between an application of said immobilization composition and an application of said inkjet composition is less than 10 second.
14. The process of claim 13 , wherein said surface is substantially a dark surface.