Description

Vinylmethylsiloxane, Dimethylsiloxane Copolymer, Vinyl Terminated is a reactive silicone polymer featuring vinyl functional groups at the chain ends, making it a versatile intermediate for further chemical modification and crosslinking. This copolymer is engineered to provide enhanced reactivity and compatibility in formulations requiring durable, flexible silicone networks. It is essential for manufacturers in the silicone rubber, adhesive, sealant, and specialty coating industries seeking to improve product performance through custom crosslink density and material properties.

Application

• High-Performance Silicone Rubber: Acts as a key reactive prepolymer in the production of high-consistency rubber (HCR) and liquid silicone rubber (LSR) for automotive, medical, and industrial components.
• Addition-Cure Systems: Serves as the vinyl-functional component in platinum-catalyzed addition cure systems for potting, encapsulating, and molding applications.
• Silicone Adhesives & Sealants: Used to formulate specialty adhesives and sealants with tailored modulus, elongation, and thermal stability.
• Release Coatings & Films: A fundamental building block in crosslinkable release liner coatings for pressure-sensitive adhesive tapes and labels.
• Silicone Modification of Plastics: Employed as a reactive modifier to improve the impact resistance, weatherability, and surface properties of engineering thermoplastics.
• Fabric & Fiber Treatment: Utilized in coatings to impart durable water repellency, softness, and abrasion resistance to textiles and nonwovens.

Basic Information

Product Name	Vinylmethylsiloxane, Dimethylsiloxane Copolymer, Vinyl Terminated
CAS No.	68083-18-1
Molecular Formula	(C2H6OSi)x(C2H3Si)y
Molecular Weight	Varies by grade (Contact for details)
Synonyms	Vinyl-terminated Polydimethylsiloxane; Vinylmethylsiloxane-Dimethylsiloxane Copolymer; Poly(dimethylsiloxane-co-methylvinylsiloxane), vinyl-terminated; Vinyl Q resin; Vinyl-functional silicone fluid; Vinyl silicone polymer; Vinylmethyl polysiloxane; Reactive vinyl silicone oil
EINECS	Contact for details

Quality Control

Our Vinylmethylsiloxane, Dimethylsiloxane Copolymer is produced under a strict quality management system. Each batch undergoes rigorous analytical testing, including determination of vinyl content, viscosity, specific gravity, and refractive index, to ensure consistent performance in your formulations. Comprehensive Certificates of Analysis (COA) documenting these parameters are available upon request 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 room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); containers must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect reactivity. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow viscous liquid
Viscosity (25°C)	Grade dependent (e.g., 500 - 50,000 cSt)
Vinyl Content (mmol/g)	0.05 - 0.50 (Grade dependent)
Specific Gravity (25°C)	0.96 - 0.98
Refractive Index (nD25)	1.400 - 1.410
Volatile Content	≤ 1.0 %
Identification (IR)	Conforms to structure

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