2-Hydroxy-3-(trimethylammonio)propyl starch ether chloride

2-Hydroxy-3-(trimethylammonio)propyl starch ether chloride (CAS 56780-58-6), also known commercially as Hydroxypropyl trimethylammonium starch chloride, is a cationic modified starch used across textile, paper, and personal care industries.

Its permanent positive charge allows it to bond strongly to negatively charged substrates, enabling surface modification and rheology control in aqueous systems. In pulp and paper manufacturing, it functions as a wet-end additive.

It acts as a surface sizing agent, improving retention, drainage, and paper strength. Textile processors apply it as a warp sizing and finishing agent, where its cationic character enhances adhesion to natural and synthetic fibers.

This material works effectively without requiring additional binders. In personal care formulations, it conditions hair and skin by depositing uniformly onto negatively charged surfaces, making it suitable for shampoos and conditioners.

It is also used in rinse-off products and leather finishing operations to improve surface coating adhesion. It modifies the rheological profile of aqueous treatment baths to ensure consistent application across various substrates.

This product is supplied as a powder or granule, with moisture content and degree of substitution being the primary specification parameters. Buyers should confirm these details with suppliers to ensure compatibility.

Grades vary by DS level, which directly determines cationic charge density and performance in end applications. Both food-contact-compliant and industrial grades are available depending on the intended use and regulatory needs.