Description

Poly(Styrene-Co-Maleic Acid), Partial Isobutyl Ester is a synthetic copolymer derived from styrene and maleic anhydride, partially esterified with isobutyl alcohol. This versatile polymer is valued for its unique combination of hydrophobic and hydrophilic segments, making it an effective emulsifier, dispersant, and rheology modifier. It is primarily utilized in industries such as coatings, adhesives, and specialty chemical formulations where compatibility and performance in complex systems are critical.

Application

• Coatings & Inks: Acts as a pigment dispersant and grinding aid, improving color development and stability in solvent-based and high-solids coatings.
• Adhesives & Sealants: Functions as a tackifier and rheology modifier, enhancing bond strength and application properties.
• Oilfield Chemicals: Used as a component in drilling fluid additives and demulsifiers for crude oil processing.
• Polymer Modification: Serves as a compatibilizer and impact modifier in polymer blends and composites.
• Industrial Cleaners: Employed as a surfactant and dispersing agent in solvent-based cleaning formulations.
• Agricultural Formulations: Aids in the dispersion of active ingredients in pesticide and herbicide concentrates.

Basic Information

Product Name	Poly(Styrene-Co-Maleic Acid), Partial Isobutyl Ester
CAS No.	28571-95-1
Molecular Formula	(C8H8·C4H2O3·C4H8O)n
Molecular Weight	Variable (Polymer)
Synonyms	Styrene Maleic Anhydride Partial Isobutyl Ester; SMA® Partial Isobutyl Ester; Poly(styrene-alt-maleic acid) partial isobutyl ester; Isobutyl half ester of styrene-maleic anhydride copolymer; SMA® IB; PSMA Partial Isobutyl Ester; Styrene/Maleic Anhydride Copolymer Partial Isobutyl Ester
EINECS	Contact for details

Quality Control

Our Poly(Styrene-Co-Maleic Acid), Partial Isobutyl Ester is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistent performance, including assessment of acid value, esterification degree, molecular weight distribution, and solution viscosity. A comprehensive Certificate of Analysis (COA) detailing these specifications is provided with every shipment to guarantee compliance with your formulation requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive). Keep the container tightly sealed when not in use to prevent moisture absorption, which may affect product performance.

Specification

Item	Specification
Appearance	Yellow to amber flakes or solid
Identification (IR)	Conforms to structure
Acid Value	Contact for details
Esterification Degree	Contact for details
Molecular Weight (Mw)	Contact for details
Solid Content	> 98.0%
Solubility	Soluble in common organic solvents

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.