Description

Poly(Caprolactone) Diol is a high-performance, biodegradable polyester polyol derived from ε-caprolactone. This versatile chemical intermediate is prized for its excellent flexibility, low-temperature properties, and compatibility with other polymers. It is essential for formulators and manufacturers in industries requiring tailored polymer performance, such as polyurethane elastomers, adhesives, and biomedical materials. Its controlled molecular weight and hydroxyl functionality make it a critical building block for advanced material synthesis.

Application

• Polyurethane Elastomers & Thermoplastic Polyurethanes (TPU): Used as a soft segment to impart superior flexibility, hydrolytic stability, and low-temperature performance in coatings, adhesives, sealants, and elastomers (CASE).
• Biodegradable & Bioresorbable Polymers: A key monomer for synthesizing biodegradable polymers used in medical devices, drug delivery systems, and environmentally friendly plastics.
• Adhesives & Sealants: Enhances toughness, adhesion, and flexibility in high-performance industrial and construction adhesives.
• Resin Modification: Acts as a reactive modifier for epoxy, acrylic, and polyester resins to improve impact resistance and flexibility.
• Coating Formulations: Used in polyurethane coatings for textiles, leather, and industrial surfaces to provide durable, flexible finishes.
• 3D Printing Materials: Serves as a precursor for producing flexible and biodegradable filaments in additive manufacturing.

Basic Information

Product Name	Poly(Caprolactone) Diol
CAS No.	36890-68-3
Molecular Formula	(C6H10O2)n·C3H8O2
Molecular Weight	Variable (Typically 530 - 4000 g/mol)
Synonyms	Polycaprolactone Diol; PCL Diol; Poly(ε-caprolactone) Diol; α,ω-Dihydroxypolycaprolactone; Poly(oxy-1-oxo-1,6-hexanediyl), α-hydro-ω-hydroxy-; Caprolactone Diol Oligomer; Poly(hexano-6-lactone) Diol; Poly(6-hydroxyhexanoic acid) Diol
EINECS	253-310-9

Quality Control

Our Poly(Caprolactone) Diol is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure consistency in molecular weight, hydroxyl value, and acid number, meeting the specifications required for high-performance applications. Certificates of Analysis (COA) documenting key parameters are provided with every shipment. We adhere to relevant industry standards and can support compliance requirements for specialized markets.

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). To prevent moisture absorption and potential degradation, containers must be kept sealed when not in use. For long-term storage, consider using a nitrogen or dry air blanket.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
Hydroxyl Value (mg KOH/g)	As per grade (e.g., 28-32, 56-60, 110-120)
Acid Value (mg KOH/g)	≤ 0.5
Water Content (%)	≤ 0.05
Molecular Weight (Mn)	As per grade (e.g., 530, 1250, 2000)
Viscosity @ 60°C (mPa·s)	Reported per grade
Identification (IR)	Conforms to structure

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