Description

1,4-Butanediol Polymer With α-Hydro-ω-Hydroxypoly(Oxy-1,2 -Ethanediyl) And 1,1'-Methylenebis[4-Isocyanatocyclohexane] CAS NO 39359-63-2 is a high-performance polyurethane prepolymer or block copolymer derived from 1,4-butanediol, polyethylene glycol, and a hydrogenated methylene diphenyl diisocyanate (H12MDI) derivative. This specialized polymer is engineered to deliver a unique balance of flexibility, hydrolytic stability, and biocompatibility, making it a critical raw material for advanced material formulations. It is primarily sought by manufacturers in the medical device, specialty adhesive, and high-performance elastomer sectors seeking to enhance product durability and performance under demanding conditions.

Application

• Medical Device Components: Used as a base polymer for manufacturing biocompatible tubing, catheter shafts, wound dressings, and other implantable or contact devices requiring flexibility and stability.
• Specialty Adhesives & Sealants: Serves as a key ingredient in formulating high-strength, moisture-curing polyurethane adhesives and sealants for automotive, construction, and aerospace applications.
• High-Performance Elastomers: Employed in the production of thermoplastic polyurethane (TPU) elastomers for applications requiring excellent abrasion resistance, low-temperature flexibility, and hydrolysis resistance.
• Controlled Release Matrices: Utilized in pharmaceutical and agrochemical formulations to create biodegradable polymer matrices for the sustained release of active ingredients.
• Coating & Resin Modifier: Acts as a flexibilizer and toughness enhancer in coatings, paints, and composite resins, improving impact resistance and adhesion.
• Fiber & Textile Finishing: Applied in the production of elastic fibers (spandex-like) and as a durable, flexible coating for technical textiles.

Basic Information

Product Name	1,4-Butanediol Polymer With α-Hydro-ω-Hydroxypoly(Oxy-1,2 -Ethanediyl) And 1,1'-Methylenebis[4-Isocyanatocyclohexane]
CAS No.	39359-63-2
Molecular Formula	Contact for details
Molecular Weight	Variable (Polymer)
Synonyms	Poly(ethylene glycol)-block-poly(butylene glycol) disocyanate terminated
H12MDI-PEG-PBT Prepolymer
Poly(butylene terephthalate)-block-poly(ethylene glycol) based polyurethane
PEG-PBT Polyurethane
Hydrogenated MDI Poly(ether ester) Urethane
4,4'-Methylenebis(cyclohexyl isocyanate) polymer with α-hydro-ω-hydroxypoly(oxy-1,2-ethanediyl) and 1,4-butanediol
Thermoplastic Polyurethane Elastomer based on PEG, BDO, and H12MDI
EINECS	Contact for details

Quality Control

Our production of this advanced polymer adheres to strict quality management systems, ensuring batch-to-batch consistency for critical applications. Key parameters such as NCO content, molecular weight distribution, and residual monomer levels are rigorously monitored. A comprehensive Certificate of Analysis (COA) detailing purity, viscosity, and functional group analysis is provided with each shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. This material is hygroscopic (moisture-sensitive) and must be stored in a cool, dry place under an inert atmosphere (e.g., nitrogen) to prevent premature polymerization or degradation. Recommended storage temperature is 2-8°C for long-term stability. Allow the sealed container to equilibrate to room temperature before opening to avoid moisture condensation.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid or solid
Identification (IR)	Conforms to structure
NCO Content	Contact for details
Viscosity (at 25°C)	Specified range per grade
Molecular Weight (GPC)	Specified range per grade
Moisture Content (KF)	< 0.05%
Residual Monomer (HPLC)	< 0.1%

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