Polyethyleneimine (PEI) CAS 9002-98-6

Polyethyleneimine (PEI) – Versatile Cationic Polymer for Paper, Food Preservation, and Emulsification

Basic Information

• Product Name: Polyethyleneimine (PEI, branched)

• CAS Number: 9002-98-6

• Synonyms: Ethylenimine polymer, polyaziridine, branched polyethyleneimine

• Appearance: Colorless to light yellow liquid (typically supplied as aqueous solution)

• Packaging: 30 kg or 50 kg drums, or custom packaging upon request.

Overview
Polyethyleneimine (PEI) is a highly branched, water‑soluble cationic polymer with a high density of primary, secondary, and tertiary amine groups. Its unique structure imparts strong positive charge, excellent adhesion, and complexing abilities. PEI is widely used across multiple industries, including papermaking, food preservation, coatings, and adhesives.

Applications

• Paper production: Used as a wet‑strength agent, retention aid, and drainage improver in papermaking, enhancing paper quality and production efficiency.

• Fruit and vegetable preservation: Acts as a preservative by forming a protective coating that reduces moisture loss and inhibits microbial growth, extending shelf life.

• Emulsifier and dispersant: Stabilizes emulsions and dispersions in various formulations, including paints, inks, and agrochemicals.

• Other uses: Employed in adhesives, textile processing, water treatment, and as a complexing agent for metal ions in electroplating and catalysts.

Key Properties

• Highly cationic – strong affinity for negatively charged surfaces and particles.

• Good water solubility – easily formulated in aqueous systems.

• Excellent complexation – binds metal ions, dyes, and other molecules.

• High reactivity – can be crosslinked or functionalized for tailored applications.

Handling and Storage

• Store in a cool, dry, well‑ventilated area, away from heat and direct sunlight.

• Keep containers tightly sealed to prevent contamination and moisture absorption.

• Use appropriate personal protective equipment (gloves, safety goggles, protective clothing) when handling.

Quality Assurance
Each batch is tested for molecular weight, solids content, pH, and viscosity to ensure consistent performance.