Applications of Polyhydroxyalkanoates Aqueous Emulsion in Industrial Manufacturing

Polyhydroxyalkanoates (PHA) aqueous emulsion, produced via microbial fermentation, offers a range of functional properties for various industries requiring biodegradable polymer solutions. The following are established downstream applications where our PHA emulsion directly supports manufacturing processes to achieve regulatory compliance, consistent quality, and improved sustainability goals.

1. Compostable Food Packaging Coatings

Leading food packaging manufacturers use PHA aqueous emulsion as a barrier coating on paper or fiber-based substrates to enhance water and oil resistance in single-use food service items. This bio-based polymer enables full industrial compostability while maintaining migration safety in direct food contact. Our emulsion exhibits high compatibility with waterborne coating applications where low VOC content and food safety certifications are mandatory for market access.

Industry compliance standards

• EU 10/2011 Framework Regulation on Food Contact Materials
• FDA 21 CFR 177.1630 for food-contact polymers
• EN 13432 Industrial Compostability Standard
• BfR XXXVI paper and board food-contact compliance

Typical usage ratio

• Applied at 10-25 dry gsm based on substrate and desired barrier performance
• Loading optimized for specific product migration limits and oxygen/water vapor transmission targets

Downstream process integration

• Blended into aqueous coating lines via in-line mixing prior to application
• Able to be applied by rod, curtain or air-knife coating machines at temperatures below 70°C
• Post-coating drying integrated into standard high-efficiency IR/convection dryers

Final product types

• Compostable paper cups
• Takeaway salad bowls
• Fiber-based fast food trays
• Wrap sandwich papers with grease resistance

2. Controlled-Release Agricultural Formulations

Major agrochemical formulators utilize PHA emulsion to encapsulate fertilizers, micronutrients, and active substances in controlled-release agricultural preparations. The slow-biodegrading matrix allows predictable release rates and improved active bioavailability. The aqueous system ensures compatibility with standard liquid fertilizer and pesticide blending lines to avoid the use of organic solvents during production, supporting worker safety and environmental compliance.

Industry compliance standards

• EU Regulation (EC) No 2003/2003: Fertilizer Products
• FAO/WHO Maximum Residue Limits (MRLs) for crop protection
• REACH Annex V exemption for biodegradable polymers
• US EPA 40 CFR Parts 156 and 158: Pesticide packaging and labeling

Typical usage ratio

• Emulsion loading at 5-20% w/w of total formulation depending on active type, particle size, and release kinetics required
• Ratio adjusted for crop type and duration of field persistence

Downstream process integration

• Emulsion added in-line with the nutrient or pesticide dispersion step
• Homogenization carried out under moderate shear to ensure uniform microencapsulation
• Ready for direct filling into water-soluble sachets or as a sprayable concentrate

Final product types

• Controlled-release urea or NPK fertilizers
• Microencapsulated insecticide dispersions
• Slow-release micronutrient granules or suspensions
• Seed coating dispersions for improved germination

3. Biodegradable Adhesive Systems

Producers of waterborne adhesives in the paper converting and packaging sectors select PHA emulsion as the primary bio-based binder to achieve plastic-free, biodegradable adhesive systems for labels, tapes, and carton sealing. The emulsion delivers strong initial tack, flexible bond lines, and clean machinability. It allows converters to meet zero-plastic certification and landfill diversion targets demanded by global brand owners and regulatory bodies.

Industry compliance standards

• DIN EN 16785-1:2015 Biobased Content Determination
• OECD 301B Ready Biodegradability Testing
• FDA 21 CFR 175.105 for adhesives in indirect food contact
• BPI Compostable Certification (North America)

Typical usage ratio

• Typically blended at 20-50% of total dry solids based on desired adhesion and open time
• Formulation tailored by substrate absorption and mechanical requirements

Downstream process integration

• Mixed with other waterborne polymers or natural thickeners in existing adhesive reactors
• Can be pumped directly to slot-die or roll-coat adhesive application units
• Does not require solvent recovery or special ventilation upgrades

Final product types

• Compostable carton-sealing adhesives
• Biodegradable paper labels
• Envelopes and mailers with waterborne tack adhesives
• Paper-based tapes for logistics and e-commerce packaging

4. Medical Device and Wound Care Films

Producers of advanced wound dressings and single-use medical films leverage PHA aqueous emulsion to engineer skin-contact films and coatings with controlled absorption and biodegradation properties. The bio-based polymer allows medical OEMs to address the growing demand for environmentally responsible components, while ensuring conformance to strict purity and extractables testing under international medical device regulations.

Industry compliance standards

• ISO 10993-1 Biocompatibility Evaluation for Medical Devices
• USP Class VI Plastics Biological Reactivity
• ISO 13485 Certified Quality Management for Medical Device Production
• FDA 21 CFR 878.4011 Absorbable Surgical Devices

Typical usage ratio

• Used as a film-forming layer in the range of 5-30 dry gsm based on absorption and barrier requirements
• Thickness and concentration adapted for direct wound contact or external protective layers

Downstream process integration

• Coating applied onto wound pad substrates, followed by precision drying and lamination
• Film-forming emulsions cast directly into physical dressing assembly lines
• Integrated into solvent-free cleanrooms to meet medical QC demands

Final product types

• Absorbable wound dressing films
• Compostable medical drape sheets
• Surgical pad liners
• Skin-contact biodegradable barrier films for single-use medical applications

5. Textile Finishes and Nonwovens

Textile chemical processors employ PHA aqueous emulsion to impart hydrophobicity and controlled biodegradability to nonwoven wipes, technical textiles, and spunbond fabrics. The formulation enables downstream OEMs to switch to renewable finishing agents for flushable and compostable wipes, adaptive insulation battings, and medical hygiene products, in compliance with rising global standards for microplastic elimination in fibers and disposable products.

Industry compliance standards

• OEKO-TEX Standard 100 (Product class I-IV)
• ISO 14855: Determination of ultimate aerobic biodegradability
• EDANA/INDA Flushability Guidelines for nonwoven wipes
• EU Single-Use Plastics Directive (Directive (EU) 2019/904)

Typical usage ratio

• Finishing application rate typically between 3-12% dry add-on, adjusted for fabric structure and end-use absorbency or repellency requirements
• Low add-on for surface modification, higher levels for barrier layer formation

Downstream process integration

• Directly applied on nonwoven web via spray, foam, or pad-finishing equipment during final stenter frame process
• Room temperature mixing achievable, preserving fabric mechanical properties
• Compatible with existing aqueous dispersion finish lines

Final product types

• Flushable personal care wipes
• Compostable medical gowns and drapes
• Biodegradable insulation materials
• Eco-certified hygiene and cosmetic pad substrates