Description

1,3-Isobenzofurandione, 3A,4,7,7A-Tetrahydro-, Polymerwith 2,5-Furandione And 1,2-Propanediol CAS NO 25749-56-8 is a specialized polymeric resin derived from maleic anhydride, phthalic anhydride, and propylene glycol, forming a versatile alkyd-type backbone. This product matters as a high-performance intermediate or modifier for coatings, adhesives, and composite materials, offering enhanced flexibility, adhesion, and chemical resistance. It is primarily needed by manufacturers in the paints & coatings, industrial adhesives, and advanced polymer composites sectors seeking to improve product durability and performance.

Application

• High-Performance Industrial Coatings: Used as a resin modifier in alkyd and polyester coatings for metal, wood, and plastic substrates to improve gloss, flexibility, and drying time.
• Adhesive Formulations: Serves as a key polymeric component in structural and laminating adhesives, enhancing bond strength and environmental resistance.
• Fiber-Reinforced Composites: Acts as a matrix resin or compatibilizer in glass or carbon fiber composites for automotive and marine applications.
• Printing Inks: Incorporated into solvent-based ink formulations to improve pigment wetting, film formation, and substrate adhesion.
• Electrical Encapsulants: Utilized in potting and encapsulation compounds for electronic components due to its good electrical insulation properties.
• Sealants and Caulks: Functions as a plasticizing resin to enhance the flexibility, adhesion, and longevity of construction and automotive sealants.

Basic Information

Product Name	1,3-Isobenzofurandione, 3A,4,7,7A-Tetrahydro-, Polymerwith 2,5-Furandione And 1,2-Propanediol
CAS No.	25749-56-8
Molecular Formula	(C8H8O3 · C4H2O3 · C3H8O2)x
Molecular Weight	Polymer - Variable
Synonyms	Maleic Anhydride-Phthalic Anhydride-Propylene Glycol Copolymer; Phthalic-Maleic Propylene Glycol Polyester; Poly(propylene glycol maleate phthalate); Alkyd Resin, maleic-phthalic type; Propylene Glycol Maleate Phthalate Polyester; 1,2-Propanediol polymer with 2,5-furandione and 1,3-isobenzofurandione, 3a,4,7,7a-tetrahydro-; Maleic Anhydride – Phthalic Anhydride – Propylene Glycol Terpolymer
EINECS	Contact for details

Quality Control

Our production of this polymeric resin adheres to strict quality management systems. Each batch undergoes rigorous testing for key parameters including acid value, viscosity, color, and solid content to ensure batch-to-batch consistency and performance reliability. Certificates of Analysis (COA) documenting these specifications are available upon request. We can support compliance with relevant industry standards for raw materials used in coatings and polymers.

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 open flame. Under these conditions, the product is typically stable for 24 months from the date of manufacture. Keep container tightly sealed when not in use to prevent moisture absorption and skin formation.

Specification

Item	Specification
Appearance	Viscous liquid to solid resin
Color (Gardner)	≤ 4
Acid Value (mg KOH/g)	10 - 50
Viscosity (at 25°C, cP)	2000 - 10000
Solid Content (%)	60 - 70 (in specified solvent)
Identification (IR)	Conforms to structure

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