What is 5-Sulfoisophthalic Acid Sodium Salt?

5-Sulfoisophthalic Acid Sodium Salt, also known as sodium 5-sulfoisophthalate, is a highly functional, water-soluble aromatic compound widely used in polymer synthesis and specialty chemical formulations. With its unique sulfonated structure, it plays a critical role in enhancing water dispersibility, dyeability, and ionic characteristics in polymers. This compound is especially valuable in the production of water-dispersible polyesters, dyes, and performance-enhancing additives.

Chemical Structure and Characteristics

The molecule consists of a benzene ring substituted with two carboxylic acid groups (in the 1,3-position) and a sulfonic acid group (at position 5), which is neutralized by a sodium ion. This configuration imparts the compound with both hydrophilic and reactive functional groups, making it particularly suitable for polymer modification.

Applications

Water-Dispersible Polyester Resins

5-Sulfoisophthalic Acid Sodium Salt is widely used as a monomer in the manufacture of water-dispersible polyester resins. Its sulfonic acid group introduces ionic sites that enhance water compatibility, enabling the final polyester to dissolve or disperse in water without surfactants.

Textile and Fiber Dyeing

SIPA-Na improves the dye uptake of polyester fibers and resins by increasing their hydrophilicity. It is often used to enhance cationic dyeability in fibers such as polyethylene terephthalate (PET).

Waterborne Coatings

In the paints and coatings industry, it enables the formulation of low-VOC, environmentally friendly waterborne coatings. It provides good film formation and excellent pigment dispersion.

Additive for Detergents and Cleaners

Due to its high water solubility and ionic properties, it can be used in specialty cleaners and industrial detergents as a dispersing aid and performance booster.

Packaging and Plastic Bottles (PET Copolymer)

As a copolymer component in PET bottle manufacturing, it enhances clarity, antistatic properties, and dyeability. This is particularly beneficial for colored or functionalized PET packaging.

Benefits and Advantages

Enhances water solubility and dyeability of polymers

Enables the development of water-based and low-VOC systems

Increases surface activity and ionic compatibility

Provides excellent pigment dispersion properties

Supports environmental and regulatory compliance in formulations

Lifeworth – Manufacturer and Supplier of 5-Sulfoisophthalic Acid Sodium Salt

Lifeworth is a leading China-based manufacturer and global supplier of 5-Sulfoisophthalic Acid Sodium Salt. We provide industrial-grade and high-purity materials tailored to polymer, textile, and coating applications. Our production is backed by ISO9001, ISO14001, and FSSC22000 certifications to ensure consistent quality and environmental responsibility.

We can supply 99% 5-Sulfoisophthalic Acid Sodium Salt powder bulk, with an annual output exceeding 5000 tons.In addition to 5-Sulfoisophthalic Acid Sodium Salt, we also supply minoxidil,aspirin, paracetamol, glutathione, resveratrol and α-lipoic acid and other products. The products meet the BP USP EP JP quality standards. At present, our products have been exported to more than 80 countries including North America, Europe, and Asia, and the product quality is deeply recognized by customers from all countries.

If you want to buy 5-Sulfoisophthalic Acid Sodium Salt, but you don’t know where to buy it, kindly contact us:sales@naturallifeworth.com, we will give you best quality, best price and best service.

Market Outlook

With growing global demand for eco-friendly water-based resins, functional PET materials, and performance textiles, 5-sulfoisophthalic acid sodium salt continues to be a strategic monomer in advanced polymer chemistry. Its role in enhancing sustainability and efficiency in manufacturing aligns with green industry trends and regulatory compliance initiatives.

Conclusion

5-Sulfoisophthalic Acid Sodium Salt is a high-performance functional monomer that enhances water compatibility, dyeability, and ionic activity in a wide range of industrial applications. From water-dispersible polyesters to PET bottles and high-tech coatings, its multifunctionality makes it indispensable. As a dependable supplier, Lifeworth is committed to delivering high-quality SIPA-Na with tailored technical solutions and competitive pricing.

Reference:

https://pubchem.ncbi.nlm.nih.gov/compound/Monosodium-5-sulfoisophthalate

Package:

1.1-5kg sample order we can provide aluminum foil bag package.

2.5-10kg order we can provide aluminum foil bag package.

3.Liquid packaging: 25kg/bag

Contacts:

E-Mail: sales@naturallifeworth.com
Mobile: 0086-18292562757
Whatsapp: 0086-18292562757