Why Do Organic Pigments Migrate in Plastics? Causes, Solutions and Selection Guide
Time:2026-07-08
Why Do Organic Pigments Migrate in Plastics? Causes, Solutions and Selection Guide
Technical insights for plastic manufacturers, masterbatch producers and polymer formulators.
Organic pigment migration occurs when pigment particles or related components move within or out of a polymer matrix because of compatibility issues, insufficient dispersion, pigment structure characteristics or additive interactions.
1. What Is Organic Pigment Migration in Plastics?
Organic pigments are widely used in plastics because of their bright shades, high tinting strength and broad color range. However, plastic manufacturers may encounter migration, bleeding or surface staining problems when pigment selection does not match the polymer system.
| Phenomenon | Main Cause | Result |
|---|---|---|
| Pigment Migration | Movement inside polymer matrix | Color transfer or uneven appearance |
| Bleeding | Soluble components transferring | Surface staining |
| Blooming | Low molecular weight materials moving outward | Surface deposits |
2. Why Do Organic Pigments Migrate?
2.1 Polymer Compatibility
Different polymers such as PP, PE, PVC and engineering plastics require different pigment performance characteristics. A suitable pigment should match the resin polarity, processing temperature and additive system.
2.2 Pigment Structure and Stability
High-performance pigment families such as quinacridone, perylene, DPP and isoindolinone are commonly selected when higher durability and migration resistance are required.
3. How to Reduce Migration Risk?
- Select migration-resistant pigment grades.
- Improve pigment dispersion during compounding.
- Evaluate pigment compatibility with additives.
- Match pigment performance with final application requirements.
4. Organic Pigment Solutions from Hangzhou Sunglow Chemical Co., Ltd.
Hangzhou Sunglow Chemical Co., Ltd. is a professional supplier specializing in pigments, colorants and specialty chemical additives for global industrial applications.
Its product portfolio covers organic pigments, inorganic pigments, fluorescent pigments and pigment pastes, as well as specialty additives.
Frequently Asked Questions
Because of compatibility, dispersion, structure and formulation factors.
High-performance organic pigments are generally preferred for demanding applications.
Yes. Poor dispersion can reduce color consistency and stability.
ontact Hangzhou Sunglow Chemical Co., Ltd.
Plant: Qiantang New Area, Xiaoshan, Hangzhou, China
Tel: +86-571-82737745
Email: sales@sunglowchem.com
Website: https://www.sunglowchem.com