Description

Poly(Styrene-Co-Maleic Acid), Partial Isobutyl/Methyl Mixed Ester is a synthetic copolymer derived from styrene and maleic anhydride, partially esterified with a mixture of isobutyl and methyl alcohols. This chemical structure provides a unique balance of hydrophobic and hydrophilic properties, making it a versatile functional polymer for demanding industrial applications. It is particularly valuable in sectors requiring advanced surface modification, rheology control, and dispersion stabilization, such as coatings, inks, and specialty adhesives.

Application

• Coatings & Inks: Acts as a dispersing agent, rheology modifier, and leveling agent in high-performance solvent-based and water-based coating systems.
• Adhesives & Sealants: Used as a tackifier and rheology control agent to enhance bond strength and application properties.
• Oilfield Chemicals: Functions as a fluid loss additive and viscosity modifier in drilling mud formulations.
• Pigment & Filler Dispersion: Aids in the stabilization and de-agglomeration of inorganic pigments and fillers in various matrices.
• Textile Processing: Employed as a finishing agent and dye-leveling auxiliary.
• Paper Sizing: Used to improve water resistance and printability of paper and paperboard.

Basic Information

Product Name	Poly(Styrene-Co-Maleic Acid), Partial Isobutyl/Methyl Mixed Ester
CAS No.	63528-92-7
Molecular Formula	(C8H8·C4H2O3·C5H10O·CH2O)x
Molecular Weight	Varies (Polymer)
Synonyms	Styrene Maleic Anhydride Partial Isobutyl/Methyl Ester; SMA® Partial Ester; Poly(styrene-alt-maleic acid) partial isobutyl/methyl ester; Styrene/Maleic Anhydride Copolymer Partial Ester; Isobutyl/Methyl Ester of Styrene Maleic Anhydride Copolymer; SMA Resin Ester; SMA Copolymer Ester; PSMA Partial Ester
EINECS	Contact for details

Quality Control

Our production of Poly(Styrene-Co-Maleic Acid), Partial Isobutyl/Methyl Mixed Ester adheres to a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistent performance characteristics, including acid value, esterification degree, molecular weight distribution, and viscosity. A comprehensive Certificate of Analysis (COA) detailing these parameters is provided with every shipment to guarantee product integrity and traceability.

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). Keep away from heat sources and incompatible materials. Under these conditions, the product is stable for an extended period.

Specification

Item	Specification
Appearance	Yellowish to amber flakes or solid
Acid Value	Contact for details
Esterification Degree	Contact for details
Molecular Weight (Mw)	Contact for details
Glass Transition Temperature (Tg)	Contact for details
Solubility	Soluble in common organic solvents

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