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

2-Hydroxy-3-(trimethylammonio)propyl starch ether chloride (CAS 56780-58-6) is a cationic modified starch. Also marketed as Hydroxypropyl trimethylammonium starch chloride.

Where is 2-Hydroxy-3-(trimethylammonio)propyl starch ether chloride used?

• Pulp and paper: wet-end additive
• Paper: surface sizing agent improving retention, drainage and strength
• Textile: warp sizing and finishing agent, cationic character enhancing adhesion to natural and synthetic fibers
• Personal care: conditions hair and skin by depositing uniformly onto negatively charged surfaces, suitable for shampoos and conditioners
• Rinse-off products and leather finishing improve surface coating adhesion
• Its permanent positive charge allows it to bond strongly to negatively charged substrates, enabling surface modification and rheology control in aqueous systems.

Good to know: Grades vary by DS level, which determines cationic charge density and performance. Both food-contact-compliant and industrial grades exist depending on intended use and regulatory needs.

Commercial specifications

• Moisture content and degree of substitution are the primary specification parameters
• Buyers should confirm these details with suppliers