Description

3-Isocyanatopropylmethyldichlorosilane is a highly reactive organosilicon compound that serves as a critical bifunctional building block, combining an isocyanate group with dichlorosilane functionality. This dual reactivity makes it an essential precursor for creating advanced silane coupling agents and functional polymers with tailored surface properties. It is primarily utilized by manufacturers in the silicone, adhesives, and specialty coatings industries seeking to enhance material compatibility, adhesion, and cross-linking performance.

Application

• Silane Coupling Agent Precursor: Key intermediate for synthesizing specialized silane coupling agents used to improve adhesion between organic polymers and inorganic substrates like glass, metals, and minerals.
• Surface Modification: Functionalization of silica, nanoparticles, and other fillers to introduce reactive isocyanate groups for subsequent polymer grafting or composite fabrication.
• Polymer Synthesis: Monomer for the production of polyurethanes, polyureas, and other specialty polymers with integrated siloxane segments for enhanced flexibility, weather resistance, or surface activity.
• Adhesives & Sealants: Imparts improved adhesion to difficult substrates and moisture-curing properties in high-performance formulations.
• Water Repellents: Used in the synthesis of compounds that confer durable water repellency to textiles, stone, and construction materials.
• Cross-linking Agent: Acts as a cross-linker in silicone and hybrid organic-inorganic resin systems, improving thermal and mechanical stability.

Basic Information

Product Name	3-Isocyanatopropylmethyldichlorosilane
CAS No.	17070-69-8
Molecular Formula	C5H9Cl2NOSi
Molecular Weight	198.12 g/mol
Synonyms	Methyldichloro(3-isocyanatopropyl)silane; 1-Isocyanato-3-(methyldichlorosilyl)propane; 3-Isocyanatopropylmethyldichlorosilane; (3-Isocyanatopropyl)methyldichlorosilane; Dichloro(3-isocyanatopropyl)methylsilane; NSC 93766; Silane, dichloro(3-isocyanatopropyl)methyl-
EINECS	241-144-4

Quality Control

Our 3-Isocyanatopropylmethyldichlorosilane is manufactured under strict process controls to ensure batch-to-batch consistency and high purity. Each lot undergoes rigorous analytical testing, including assay, impurity profiling, and identity confirmation. A Certificate of Analysis (COA) detailing all specifications is provided with every shipment to guarantee compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at temperatures between 2°C and 8°C (refrigerated) to minimize volatility and degradation. Due to its highly volatile and hygroscopic (moisture-sensitive) nature, containers must be kept sealed under a dry inert atmosphere (e.g., nitrogen or argon) and allowed to equilibrate to room temperature before opening to prevent moisture ingress.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (GC)	≥ 97.0%
Density (at 20°C)	1.20 - 1.25 g/mL
Refractive Index (n20D)	1.460 - 1.470

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