Description

Vinylmethylsiloxane - Dimethylsiloxane Copolymers, Trimethylsiloxy Terminated, Silanol Terminated are a versatile class of organosilicon polymers featuring a hybrid structure of dimethylsiloxane and vinylmethylsiloxane units. This unique architecture provides a balance of silicone fluid properties with reactive vinyl and silanol functionalities, making them valuable as reactive intermediates and modifiers. These copolymers are essential for formulators and manufacturers in the silicone rubber, adhesive, and specialty coating industries seeking to enhance material properties through crosslinking or copolymerization.

Application

• Reactive Intermediate for Silicone Manufacturing: Used in the synthesis of custom silicone resins, elastomers, and gels via hydrosilylation or condensation reactions.
• Crosslinking Agent for Addition-Cure Systems: Acts as a reactive component in platinum-catalyzed silicone rubber (LSR/HCR) formulations to control crosslink density and introduce vinyl functionality.
• Adhesive & Sealant Modifier: Imparts improved adhesion, flexibility, and thermal stability to silicone-based adhesives, sealants, and potting compounds.
• Release Coating Formulations: Serves as a key ingredient in solvent-based or solventless release coatings for labels and industrial papers.
• Fabric & Fiber Treatment: Used to create durable, soft-hand finishes and water-repellent coatings on textiles and non-wovens.
• Personal Care & Cosmetic Ingredients: Functions as a conditioning agent and film-former in hair care and skincare products, providing shine and manageability.
• Polymer Modification: Employed as an additive or compatibilizer to improve the impact resistance, weatherability, and surface properties of organic polymers.

Basic Information

Product Name	Vinylmethylsiloxane - Dimethylsiloxane Copolymers, Trimethylsiloxy Terminated, Silanol Terminated
CAS No.	67923-19-7
Molecular Formula	(C2H6OSi)n(C4H12OSi)m - Variable copolymer
Molecular Weight	Variable (Typically 500 - 100,000 g/mol)
Synonyms	Vinylmethylsiloxane-dimethylsiloxane copolymer, trimethylsiloxy terminated; Poly(dimethylsiloxane-co-methylvinylsiloxane), trimethylsiloxy terminated; Silanol-terminated vinylmethylsiloxane-dimethylsiloxane copolymer; Vinyl Q resin intermediate; Reactive vinyl silicone fluid; Vinyl-functional polysiloxane; Methylvinylsiloxane-dimethylsiloxane copolymer
EINECS	Contact for details

Quality Control

Our Vinylmethylsiloxane - Dimethylsiloxane Copolymers are manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistent performance, including measurement of vinyl content, silanol content, viscosity, and molecular weight distribution. A comprehensive Certificate of Analysis (COA) detailing all specifications is provided with every shipment to guarantee compliance with your formulation requirements.

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/59-77°F). This product is hygroscopic (moisture-sensitive). Keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect reactivity. Store away from strong acids, bases, and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Viscosity (25°C)	50 - 100,000 cSt (Grade dependent)
Vinyl Content (mmol/g)	0.2 - 5.0 (Grade dependent)
Silanol Content (wt%)	0.1 - 3.0 (Grade dependent)
Specific Gravity (25°C)	0.95 - 1.00
Refractive Index (n20D)	1.400 - 1.410
Volatile Content (%, 150°C, 3h)	≤ 2.0
Identification (IR)	Conforms

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