Description

1,3-Butanediol, Polymer With .Alpha.-Butyl-.Omega.-Hydroxypolyoxy(Methyl-1,2-Ethanediyl) And 1,3-Diisocyanatomethylbenzene CAS NO 68400-67-9 is a specialized polyurethane prepolymer or polyol derivative, synthesized from 1,3-butanediol, a polyether polyol, and 1,3-diisocyanatomethylbenzene (meta-tetramethylxylene diisocyanate, m-TMXDI). This compound matters as a high-performance building block, offering a unique balance of flexibility, hydrolytic stability, and weatherability for advanced polymer formulations. It is primarily needed by manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries, as well as for producing specialty polyurethane dispersions (PUDs) and thermoplastic polyurethanes (TPUs).

Application

• High-Performance Coatings: Used as a key resin component in automotive, industrial, and marine coatings requiring excellent durability, gloss retention, and resistance to chemicals and UV degradation.
• Adhesives & Sealants: Serves as a prepolymer for formulating flexible, strong, and moisture-curing adhesives and sealants with good adhesion to various substrates.
• Elastomers: A precursor for casting or molding polyurethane elastomers that demand a combination of toughness, elasticity, and resistance to hydrolysis and yellowing.
• Polyurethane Dispersions (PUDs): An essential raw material for creating water-based PUDs used in environmentally friendly coatings, textiles, and leather finishing.
• Thermoplastic Polyurethanes (TPUs): Employed in the synthesis of TPUs for applications like films, hoses, cables, and medical devices where clarity and stability are crucial.
• Resin Modifier: Acts as a modifier for other polymer systems to enhance flexibility, impact resistance, and processing characteristics.

Basic Information

Product Name	1,3-Butanediol, Polymer With .Alpha.-Butyl-.Omega.-Hydroxypolyoxy(Methyl-1,2-Ethanediyl) And 1,3-Diisocyanatomethylbenzene
CAS No.	68400-67-9
Molecular Formula	Complex Polymer / Mixture
Molecular Weight	Varies by grade and composition
Synonyms	Polyurethane prepolymer based on 1,3-butanediol and m-TMXDI; m-TMXDI/1,3-Butanediol/Polyether Polyol Prepolymer; Poly[oxy(methyl-1,2-ethanediyl)], α-butyl-ω-hydroxy-, polymer with 1,3-butanediol and 1,3-diisocyanatomethylbenzene; Polyether polyurethane prepolymer; PU prepolymer (m-TMXDI type); 1,3-BG based polyurethane resin; Meta-tetramethylxylene diisocyanate copolymer
EINECS	Contact for details

Quality Control

Our production of this polyurethane prepolymer adheres to strict quality management systems to ensure batch-to-batch consistency and performance reliability. Key parameters such as NCO content, viscosity, hydroxyl value, and color are rigorously monitored. A comprehensive Certificate of Analysis (COA) detailing all relevant specifications is provided with each shipment to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at temperatures recommended for the specific grade (typically between 15°C and 25°C). This product is hygroscopic (moisture-sensitive) and must be protected from atmospheric moisture to prevent premature reaction and viscosity increase. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
Identification (IR)	Conforms to structure
NCO Content	Specified range (%)
Viscosity @ 25°C	Specified range (cP/mPa·s)
Hydroxyl Value (OH#)	Specified range (mg KOH/g)
Color (Gardner)	≤ Specified value
Specific Gravity @ 25°C	Specified range
Moisture Content (Karl Fischer)	≤ 0.05%

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