TECHNICAL COMPARISON · TEXTILE INK DEVELOPMENT
Self-Dispersed vs Polymer-Encapsulated Pigment Dispersions for DTG
Water-based surface-modified dispersions and encapsulated polymer dispersions address different formulation priorities. Compare storage stability, dry/wet rubbing fastness and the demands of polyester direct-to-garment printing.
Dispersion stability and textile fastness are different jobs
An inkjet pigment must remain dispersed through storage and printing, then stay attached to the textile after curing. These are related but distinct requirements. A dispersion can be exceptionally stable in water and still need a carefully selected binder to deliver rubbing fastness. A polymer-rich system can give strong fixation yet demand extra attention to filtration, nozzle recovery and film formation.
A useful practical distinction is a stability-led colourant platform versus a fixation-led pigment/polymer architecture. AIC's application experience highlights the storage-stability appeal of grafted self-dispersed colorants and the dry/wet rubbing-fastness advantages that selected polymer-encapsulated systems can offer, especially in polyester DTG. These are application-specific selection observations, not a measured ranking of every commercial grade.
Grafted water-based surface-modified dispersions
In the self-dispersed route discussed here, hydrophilic functional groups are chemically attached to the pigment surface to support aqueous dispersion. The terminology includes water-based surface-modified pigment dispersions and grafted self-dispersed pigment colorants. “Surface-modified” is a broader term, however: it does not by itself prove covalent grafting or the absence of an external dispersant.
The functionalised pigment surface supports interaction with the aqueous vehicle. It is not automatically a film-forming adhesive for textile fibres. In a DTG ink, an independently selected binder, pretreatment and cure generally remain important parts of fixation.
Polymer-encapsulated pigment dispersions
The second route is a pigment associated with a polymer shell or engineered pigment/polymer composite. For clarity, we use polymer-encapsulated pigment dispersions, also called encapsulated polymer dispersions in some commercial discussions. An ordinary mixture of pigment dispersion and latex binder is not necessarily an encapsulated pigment.
A suitable polymer architecture can combine colloidal stabilisation with film formation around the colourant during drying and curing. Shell composition, coverage, glass-transition behaviour and crosslinking determine whether this helps adhesion, hand feel and durability. Not every polymer shell is a textile binder, and not every encapsulated ink can eliminate separate binder or pretreatment.
Advantages and trade-offs at a glance
| Factor | Grafted self-dispersed route | Polymer-encapsulated route |
|---|---|---|
| Core advantage | Aqueous dispersion control and freedom to select the fixation package separately. | Integration of pigment and polymer for a targeted film-forming or fixation function. |
| Storage stability | A key strength of a well-designed grafted surface; still sensitive to the full vehicle. | Can also be highly stable; depends on shell design, surfactants and formulation. |
| Dry/wet rubbing | Strongly dependent on external binder, pretreatment and cure. | A suitable shell can improve pigment retention and rubbing resistance. |
| Polyester DTG | Possible with a qualified fixation system; self-dispersion alone does not ensure polyester adhesion. | A valuable candidate when adhesion and wet rubbing are the limiting requirements. |
| Formulation flexibility | Colourant and binder can be optimised independently, subject to compatibility. | Polymer functionality is partly built in; changes may require a different encapsulated grade. |
| Jetting and maintenance | Check electrolyte sensitivity, particle tails and compatibility after adding binder. | Check composite particle distribution, filterability and polymer film/deposit formation during idle periods. |
| Fabric feel | Governed by total binder, ink laydown and curing. | Governed by shell properties, polymer amount and curing; not inherently harder or softer. |
Why the grafted route can be attractive for stability
Chemically attached functionality provides a surface-based stabilisation strategy rather than relying only on reversible adsorption of a dispersant. This can be useful when developing a robust aqueous inkjet dispersion. It does not make the system insensitive to salts, pH changes or incompatible resin: charge screening and adverse interactions can still promote aggregation.
Why encapsulation can be attractive for fastness
When the polymer is suited to the substrate and cure, it can help retain the pigment in a cohesive, adherent film. Wet rubbing additionally challenges water resistance and the mechanical integrity of that film. Polymer chemistry, rather than the word “encapsulated,” is what creates the benefit.
Published miniemulsion research on encapsulated pigment inks also reports improvements in colloidal stability. That is important evidence against assuming encapsulated dispersions are necessarily less stable. The study concerned cotton and particular formulations, not a universal comparison with AIC grafted colorants. Source: Development of self-curable hybrid pigment inks.
Why polyester DTG may favour a polymer-rich approach
Polyester is not interchangeable with cotton. Its surface, garment finishes and heat response create different wetting and fixation conditions. A pigment stays insoluble; it does not colour polyester by the diffusion mechanism of a disperse dye. It must be retained through an appropriate polymer/fabric interface.
DuPont's DTG process guidance identifies polyester adhesion as a challenge and stresses that a solution for one polyester garment may not work for every fabric construction. Pretreatment, ink and curing must be qualified together. Source: DuPont DTG process guide.
In polyester DTG projects where a grafted-colourant formulation cannot meet the required dry and wet rubbing results within the available process window, a polymer-encapsulated dispersion should remain a serious option. This is not abandoning self-dispersion; it is selecting the architecture that addresses the dominant failure mode. An external binder with a self-dispersed colourant is another route worth comparing.
Research on pigment/polymer composites printed on polyester links polymer composition, film morphology and baking to changes in rubbing performance. It supports the role of the fixation architecture, but it is not a Ricoh G6 printer qualification or proof that every encapsulated grade outperforms every grafted grade. Source: Pigment/polymer composite films on polyester.
Also check hand feel, stretch, wash durability and dye migration from coloured polyester. A shell that improves rubbing does not automatically prevent migration, and additional polymer can change the tactile result. The winning formulation must satisfy the complete garment specification.
Ricoh G6: distinguish printhead compatibility from fabric fixation
In the DTG applications described by AIC, some printers referred to commercially as using Ricoh G6 still favour polymer-encapsulated colourant systems because of the target fabric and durability requirement. This is a useful application-selection observation, not a blanket printhead rule.
Record the actual head designation rather than relying on “G6” alone. Ricoh's MH5320/MH5340 documentation describes compatibility with aqueous, solvent and UV-based inks. It does not state that all textile inks must use encapsulated pigments. Source: Ricoh MH5320/MH5340 datasheet.
The printhead determines part of the jetting requirements; the fabric and fixation process determine much of the durability requirement. Both architectures need validation for viscosity at operating temperature, surface tension, particle-size tails, filtration, material compatibility, waveform and drop formation. The complete printer's ink path, maintenance routine and idle behaviour also matter.
A system can jet cleanly but fail wet rubbing on polyester. Another can pass textile fastness but cause poor nozzle recovery. Neither is production-ready. Do not substitute an unqualified ink merely because it has the same nominal viscosity or a familiar pigment CI number.
A fair comparison starts with equal test conditions
- Compare on actual pigment content. Encapsulated products can include substantial polymer solids. Total solids is not the same as pigment loading; compare both and record the pigment/polymer ratio.
- Use two comparison stages. First examine each colourant in a controlled vehicle for dispersion behaviour. Then optimise each complete ink independently within the same agreed print and cure limits, documenting binder, pretreatment and additives.
- Measure stability and operation separately. Compare particle distribution, viscosity drift, sediment/redispersibility, filterability, circulation and nozzle recovery after agreed storage and operating conditions.
- Use the same fabric and image. Match garment batch, pretreatment, laydown, white backing where used, cure and conditioning. Assess opacity and shade so reduced colour transfer is not mistaken for lower colour loading.
- Test dry and wet rubbing explicitly. Agree a method such as ISO 105-X12, fabric conditioning and acceptance criteria with the buyer; add washing, feel and stretch tests as required.
ISO 105-X12 specifies textile rubbing tests using dry and wet rubbing cloths. It supplies a common measurement framework, not a universal pass grade for every garment. No head-to-head AIC/encapsulated dataset or numerical superiority claim is presented in this article.
Choose the architecture that solves the customer's problem
For an ink maker seeking a stable, adaptable aqueous inkjet colorant platform, AIC Series grafted self-dispersed pigment dispersions are a strong starting point. For polyester DTG where fixation and dry/wet rubbing dominate the specification, a qualified polymer-encapsulated system may be the more appropriate choice. The two routes can coexist across an ink portfolio.
The most useful question is not “Which technology wins everywhere?” It is “Which combination of colourant, binder, fabric and printer meets this customer's requirements reliably?” Share your actual fabric, head model, pretreatment and target fastness to start that comparison.
Explore AIC surface-modification technology, the AIC colour catalogue and our textile pigment versus disperse ink guide.
Frequently asked questions
Is a surface-modified pigment always self-dispersed?
No. Surface modification includes different treatments. Confirm the attachment chemistry and the stabilisation mechanism for the specific grade.
Does Ricoh G6 require encapsulated pigment?
Not as a universal requirement. The exact printer/ink system needs jetting qualification, while the fabric may favour a polymer-encapsulated route for fastness.
Can self-dispersed colourants deliver good polyester fastness?
Potentially, with a suitable binder, pretreatment and cure. The dispersion's storage performance alone cannot establish that result.