Styrene maleic anhydride copolymer

Description

1. Product Overview
Styrene Maleic Anhydride Copolymer (SMA) is a high-performance functional polymer synthesized via controlled free-radical copolymerization, available in varying maleic anhydride ratios. Its primary industrial use is as a specialized emulsifier, sizing agent, and compatibilizer in high-value coatings, adhesives, and engineering plastics. The key value proposition lies in its unique ability to impart high heat resistance, superior pigment wetting, and reactive compatibility between otherwise immiscible polymers. Strategically, SMA is critical for industries transitioning to low-VOC, high-solid formulations and lightweight automotive composites.

2. Key Specifications & Technical Characteristics

• Chemical composition: Alternating or random copolymer of styrene and maleic anhydride (typical MA content: 8–50 mol%)

• Purity level: ≥99% active polymer content (low residual monomer)

• Physical characteristics:

  • Form: White to off-white free-flowing powder or granular pellets

  • Glass transition temperature (Tg): 120–200°C (dependent on MA ratio)

  • Density: 1.08–1.18 g/cm³

  • Particle size: 100–500 µm (custom milling available)

• Packaging options: 25 kg multi-wall kraft bags with PE liner; 500 kg super sacks; 1000 kg heat-sealed FIBCs

• Shelf life: 24 months when stored below 40°C in dry, well-ventilated conditions

3. Core Industrial Applications

• Primary industries: Paints & coatings, printing inks, papermaking, water treatment, engineering plastics, and construction chemicals

• Specific use cases:

  • Waterborne alkyd emulsions: SMA as a high-efficiency emulsifier replaces conventional surfactants, enabling finer particle size and freeze-thaw stability.

  • Pigment dispersion: Superior wetting and stabilization of organic/inorganic pigments, reducing milling time by up to 25%.

  • Glass fiber sizing: SMA acts as a reactive film former, improving adhesion between glass fibers and polyamide or ABS matrices.

  • Water treatment: As a scale inhibitor and dispersant for calcium carbonate and gypsum.

• Why better than alternatives: Compared to traditional maleic copolymers or styrene-acrylics, SMA offers higher thermal stability (up to 260°C) and anhydride reactivity for post-polymerization crosslinking, enabling lower dosage rates (15–30% reduction) and longer equipment life in demanding environments.

4. Competitive Advantages

• Quality consistency: ISO 9001:2025 certified production with SPC-controlled molecular weight distribution (PDI < 2.0). Each lot includes FTIR and GPC traceability.

• Supply reliability: Multi-plant global capacity (Asia, Europe, Americas) with 5,000 MT annual output. Safety stock held in three regional hubs.

• Logistics capability: 72-hour dispatch for standard grades; 15-day lead time for custom MA ratios or micronized grades.

• Price competitiveness: Tier-1 performance at 10–18% below European and North American specialty polymer benchmarks due to integrated raw material streams.

• Sustainability: 100% solvent-free manufacturing; copolymer is non-hazardous under GHS; supports low-VOC and high-solid formulations.

• Technical support: Dedicated application labs offering formulation trials, compatibility testing, and SDS/TDS in 12 languages.

5. Commercial & Supply Information

• Minimum order quantity (MOQ): 5 MT (20 MT for custom ratio grades)

• BULK 20MT: One full 20-foot container = 20 metric tons (net weight) packaged in 25 kg bags palletized and stretch-wrapped