PLA Colour Masterbatch for Sustainable Polymer Applications

Sustainable Colouring for PLA Products

Polylactic Acid, commonly known as PLA, is a bio-based thermoplastic widely used in sustainable packaging, disposable products, food-service articles, films, sheets and additive manufacturing. PLA can be produced from renewable feedstocks such as starch- or sugar-based raw materials and is used in applications where biodegradability or compostability is an important part of the material concept.

Colouring PLA presents specific technical challenges. Pigments must be compatible with the polymer, withstand the processing temperature and disperse uniformly without unnecessarily affecting the mechanical or processing characteristics of the base resin. A conventional colour concentrate designed for PP, PE or other fossil-based polymers may not provide the same compatibility when introduced into PLA.

EXTRUTEX PLA Colour Masterbatch is therefore formulated around a PLA-compatible carrier system. This allows the pigment concentrate to integrate efficiently into the PLA matrix while maintaining a controlled and repeatable colour result.

The result is a practical solution for manufacturers who want to combine visual quality, processing efficiency and a bio-based polymer system.

What Is PLA Colour Masterbatch?

PLA colour masterbatch is a concentrated mixture of pigments and a compatible PLA carrier polymer supplied in granular form. Instead of adding loose pigment powders directly to the production process, the processor introduces a controlled quantity of masterbatch into the natural or base-coloured PLA resin.

This approach provides several advantages. The pigments are already dispersed within the carrier, helping to reduce pigment dusting and simplify material handling. The granular format also makes dosing more convenient and supports cleaner production compared with directly handling fine pigment powders.

EXTRUTEX can develop standard and customized colour concentrates for different PLA grades, processing technologies and product requirements. Colour matching can be carried out according to customer samples or recognized colour references such as Pantone or RAL, subject to the specific application and pigment system.

Key Advantages of EXTRUTEX PLA Masterbatch

PLA Masterbatch for Film Extrusion

PLA films are increasingly used for packaging, agricultural products, bags and other applications where a bio-based polymer system is desired. Colour can play an important role in brand identity, product differentiation and visual communication.

EXTRUTEX PLA Colour Masterbatch can be formulated for film extrusion applications requiring consistent colour dispersion and stable processing. The concentrate can be designed for transparent, translucent or opaque effects depending on the selected pigment and required appearance.

In film production, proper dispersion is particularly important because pigment agglomerates or inconsistent dosing can become highly visible in thin material. A correctly formulated masterbatch helps processors achieve a uniform visual appearance while simplifying pigment addition.

PLA Masterbatch for Food Packaging

PLA is used in various food-service and packaging applications, including cups, lids, trays, containers and other disposable articles. Colour provides an important function in these products by strengthening brand identity and helping consumers distinguish between product ranges.

EXTRUTEX can develop colour systems for suitable PLA packaging applications using pigment systems selected according to the intended regulatory and technical requirements.

For food-contact applications, the final formulation must be evaluated against the applicable regulations of the target market. Food-contact compliance depends on the complete formulation, pigment selection, additives, processing conditions and finished article. EXTRUTEX can support customers in selecting appropriate material systems for their intended application.

PLA Coffee and Tea Capsules

Compostable coffee and tea capsules represent a specialized application where material selection, appearance and processing performance must work together. The capsule must maintain the required shape and mechanical characteristics while also tolerating the conditions encountered during filling and brewing.

Colour is equally important for capsule manufacturers because strong, recognizable colours can support product differentiation and brand identity. EXTRUTEX PLA Colour Masterbatch can be customized for capsule applications requiring highly opaque colours, natural shades or specific brand colours.

Pigment selection and thermal stability are particularly important for these applications. EXTRUTEX can formulate the masterbatch according to the processing conditions and colour requirements of the selected PLA grade.

Injection Moulding Applications

Injection moulding is one of the most important processing technologies for PLA products. It can be used to manufacture disposable tableware, containers, technical components, packaging parts and consumer products.

EXTRUTEX PLA masterbatch is designed to disperse efficiently during the melting and mixing stage, providing a consistent colour throughout the moulded article. The correct dosage depends on the required colour strength, base resin, product geometry and pigment concentration.

Typical starting dosage levels may be in the range of 1–5%, although the actual dosage should be established through application testing. Dark, highly saturated colours may require different concentrations from light or translucent shades.

Thermoforming and PLA Sheet Applications

PLA sheet can be thermoformed into trays, containers, packaging components and other products. Consistent colour dispersion is particularly important for sheet applications because surface defects and colour variations can become visible across large areas.

EXTRUTEX PLA masterbatch can be formulated for sheet extrusion and thermoforming applications, supporting consistent colour development during the extrusion process while maintaining compatibility with the selected PLA grade.

3D Printing and PLA Filament

PLA is one of the most widely used materials for 3D printing. Colour is an important part of the filament market, with manufacturers producing everything from basic black and white filaments to highly saturated colours, pastel shades and special visual effects.

EXTRUTEX PLA Colour Masterbatch can be used as a colour concentrate for suitable filament production systems. Consistent pigment dispersion is essential for producing filament with uniform colour along its entire length.

Formulations can be optimized according to the PLA grade, extrusion temperature, desired colour strength and filament diameter. Additional functional requirements can also be evaluated where appropriate.

Biodegradability and Compostability

One of the major reasons manufacturers choose PLA is its bio-based origin and its potential suitability for industrial composting systems when the complete product has been appropriately formulated and certified.

EXTRUTEX PLA Colour Masterbatch uses a PLA-based carrier system designed to support biodegradable and compostable product concepts. However, the compostability of a finished article is determined by the complete formulation and product construction, not simply by the presence of PLA masterbatch.

Pigments, additives, processing conditions, product thickness and the complete material composition can all influence the final certification. Where EN 13432 or another compostability standard is required, the finished product should be tested and certified according to the requirements of the relevant market.

EXTRUTEX can support customers in selecting suitable pigment and carrier systems for applications targeting compostable product requirements.

Thermal Stability and Processing

PLA has a relatively narrow processing window compared with some conventional thermoplastics. Excessive heat, long residence times or excessive moisture can contribute to polymer degradation and reduced material performance.

EXTRUTEX PLA masterbatch formulations are designed with typical PLA processing conditions in mind. Pigments and additives are selected according to their thermal behaviour and compatibility with the carrier system.

Proper drying is particularly important. PLA is hygroscopic and can absorb moisture from the surrounding environment. Moisture during processing may contribute to hydrolytic degradation, reduced molecular weight, surface defects and processing instability.

For this reason, both the PLA resin and masterbatch should be stored correctly and processed according to the recommended drying and temperature conditions of the selected material grade.

Technical Parameters

Storage and Handling

Because PLA is sensitive to moisture, correct storage is essential for maintaining masterbatch quality. The material should remain sealed in its original moisture-resistant packaging until required for production.

• Store in a dry and cool environment.
• Protect the material from direct sunlight and excessive heat.
• Keep packaging sealed when not in use.
• Avoid unnecessary exposure to atmospheric humidity.
• Follow the recommended drying procedure before processing.
• Do not mix different grades without checking compatibility.

If the packaging has been opened for an extended period, the material should be evaluated and dried according to the processing recommendations for the selected PLA grade.

Custom Colour Development

Colour is often one of the most visible characteristics of a finished plastic product. For consumer products and packaging, even small variations can affect brand consistency and customer perception.

EXTRUTEX provides customized colour development based on Pantone references, RAL references, customer colour samples or defined colour targets. The final formulation can be adjusted according to the opacity, gloss, transparency, pigment concentration and processing requirements of the product.

Special colour effects can also be evaluated for suitable PLA applications, including natural earth tones, soft pastel shades, high-opacity colours and selected metallic or pearlescent effects.

Quality Control

Consistent masterbatch quality requires control of both the raw materials and the final concentrate. EXTRUTEX evaluates key characteristics such as colour performance, pigment dispersion, moisture and processing behaviour according to the requirements of the selected grade.

Batch-to-batch consistency is particularly important for customers producing branded packaging or large-volume consumer products. A stable masterbatch allows the processor to maintain more consistent production conditions and reduce unwanted colour variation.

Specific quality-control and testing requirements can be agreed according to the application, market and customer specification.

Packaging and Delivery

• Standard packaging: typically 25 kg moisture-resistant bags.
• Moisture protection: sealed inner liners or vacuum packaging can be considered for demanding applications.
• Custom packaging: available according to customer requirements.
• Delivery: production and shipment schedules are confirmed according to order quantity and formulation.
• Transportation: sea, air and express logistics can be arranged according to destination and customer requirements.

Technical Support

EXTRUTEX provides technical assistance during colour selection, masterbatch dosage and processing optimization. Customers can discuss their PLA grade, production technology, desired colour and final product requirements with our technical team.

Support may include colour development, sample evaluation, dosage recommendations, processing guidance and troubleshooting related to dispersion, moisture or colour consistency.

For new applications, sample testing is recommended before full-scale production. This allows the masterbatch to be evaluated under the customer's actual processing conditions and with the intended PLA resin.

Frequently Asked Questions

Q1: What is PLA Masterbatch used for?

A: PLA masterbatch is primarily used to colour PLA and selected biodegradable polymer materials. Typical applications include film, sheet, injection moulding, thermoforming, packaging, disposable products and selected 3D printing materials.

Q2: Is the masterbatch biodegradable?

A: The carrier is PLA-based and intended for biodegradable and compostable polymer applications. The compostability of the final product depends on the complete formulation, pigments, additives, product design and applicable certification requirements.

Q3: Can EXTRUTEX produce custom colours?

A: Yes. Custom colours can be developed according to Pantone, RAL or a customer-supplied colour sample, subject to the selected PLA grade and pigment system.

Q4: What is the recommended dosage?

A: A typical starting dosage is approximately 1–5%, but the correct level depends on pigment concentration, colour intensity, base resin and final product requirements.

Q5: Does the masterbatch affect PLA mechanical properties?

A: When properly formulated and used at the recommended dosage, the masterbatch is designed to minimize unwanted effects on the properties of the base PLA. Actual performance should always be confirmed through application testing.

Q6: Can it be used with PBAT or PBS?

A: Selected formulations may be compatible with PBAT, PBS and other biodegradable polymers. Compatibility depends on the specific carrier and polymer blend, so testing is recommended before production.

Q7: Why does PLA masterbatch need moisture protection?

A: PLA is hygroscopic and absorbs moisture from the environment. Excess moisture during processing can cause hydrolytic degradation, reducing melt strength and potentially creating processing and surface problems.

Q8: Can PLA masterbatch be used for food packaging?

A: It can be formulated for suitable food-packaging applications, but food-contact compliance must be evaluated for the complete formulation and finished product according to the regulations of the target market.

Q9: Can samples be provided?

A: Sample quantities can be arranged for colour development and application testing. Sample requirements depend on the colour, formulation and intended application.

Q10: Where is EXTRUTEX PLA Masterbatch manufactured?

A: EXTRUTEX PLA Masterbatch is manufactured in China, with R&D and formulation engineering under EXTRUTEX Austria.