Description

1,3-Benzenedicarboxylic Acid, Polymer With (E)-2-Butenedioic Acid And 1,2-Propanediol CAS NO 26249-22-9 is a specialized unsaturated polyester resin, a high-performance polymer synthesized from isophthalic acid, fumaric acid, and propylene glycol. This material is engineered to provide an exceptional balance of mechanical strength, chemical resistance, and thermal stability for demanding industrial applications. It is a critical raw material for manufacturers in the coatings, composites, and specialty plastics industries seeking to enhance product durability and performance.

Application

• High-Performance Coatings and Gel Coats: Used in the formulation of corrosion-resistant industrial coatings, marine finishes, and protective gel coats for fiberglass reinforced plastics (FRP).
• Fiberglass Reinforced Composites: Serves as the matrix resin in the production of lightweight, strong composite parts for the automotive, transportation, and construction sectors.
• Sheet Molding Compound (SMC) / Bulk Molding Compound (BMC): A key component in molding compounds for manufacturing large, complex, and dimensionally stable parts.
• Chemical-Resistant Tanks and Vessels: Ideal for fabricating storage tanks, pipes, and scrubbers that handle aggressive chemicals due to its inherent resistance.
• Electrical Laminates and Encapsulants: Employed in electrical applications requiring good insulating properties and thermal endurance.
• Adhesives and Sealants: Used to formulate structural adhesives with high bond strength and environmental resistance.

Basic Information

Product Name	1,3-Benzenedicarboxylic Acid, Polymer With (E)-2-Butenedioic Acid And 1,2-Propanediol
CAS No.	26249-22-9
Molecular Formula	(C8H6O4·C4H4O4·C3H8O2)x
Molecular Weight	Polymer - varies by grade
Synonyms	Isophthalic-Fumaric-Propylene Glycol Polyester; Unsaturated Polyester Resin based on Isophthalic Acid and Fumaric Acid; Isophthalic Polyester Resin; UPR (Isophthalic Grade); Poly(1,3-phenylenedicarboxylic acid-co-fumaric acid-co-propylene glycol); Fumaric Acid-Isophthalic Acid-Propylene Glycol Copolymer; Propylene Glycol-Fumaric Acid-Isophthalic Acid Copolymer
EINECS	Contact for details

Quality Control

Our unsaturated polyester resins are manufactured under strict quality management systems to ensure batch-to-batch consistency and performance reliability. Key parameters such as acid value, viscosity, and styrene content are rigorously monitored. Certificates of Analysis (COA) detailing specific lot specifications are available upon request, supporting compliance with relevant industry standards for composite and coating applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at temperatures between 15-25°C (59-77°F). Keep away from heat sources, sparks, and open flame. The product is light-sensitive and should be stored away from direct light exposure to prevent premature gelation or changes in viscosity. Shelf life is typically 6 months from the date of manufacture when stored under recommended conditions.

Specification

Item	Specification
Appearance	Clear, viscous liquid
Color (Gardner)	≤ 3
Acid Value (mg KOH/g)	20 - 30
Viscosity at 25°C (cps)	400 - 800
Non-Volatile Content (%)	65 - 70
Gel Time at 25°C (min)	10 - 25
Specific Gravity at 25°C	1.10 - 1.15

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