Description

Vinylmethylsiloxane - Dimethylsiloxane Copolymers, Trimethylsiloxy Terminated are a class of reactive silicone polymers featuring a backbone of dimethylsiloxane units interspersed with vinylmethylsiloxane groups, terminated with inert trimethylsiloxy groups. This unique structure provides a balance of processability and reactivity, making them valuable as reactive intermediates or modifiers in advanced silicone formulations. These copolymers are essential for manufacturers in the silicone rubber, adhesive, sealant, and specialty coating industries seeking to enhance material properties through cross-linking or copolymerization.

Application

• Silicone Rubber & Elastomers: Acts as a reactive modifier or base polymer in heat-cured (HCR) and liquid silicone rubber (LSR) formulations, where the vinyl groups participate in platinum-catalyzed hydrosilylation cross-linking.
• Silicone Adhesives & Sealants: Used as a key component in addition-cure silicone adhesives and sealants, contributing to improved adhesion, flexibility, and thermal stability in the cured product.
• Release Coatings & Liners: Serves as a backbone polymer in platinum-cure release coating formulations for papers and films, providing controllable release force.
• Silicone Resins & Coatings: Incorporated as a reactive silicone intermediate in the synthesis of silicone resins and high-performance protective coatings, enhancing weatherability and chemical resistance.
• Personal Care & Cosmetic Ingredients: Utilized as a conditioning agent or film-former in hair care and skincare products, offering a soft, non-greasy feel.
• Polymer Modification: Employed as a grafting agent or compatibilizer to introduce silicone characteristics into organic polymer matrices, improving surface properties and processing.

Basic Information

Product Name	Vinylmethylsiloxane - Dimethylsiloxane Copolymers, Trimethylsiloxy Terminated
CAS No.	67762-94-1
Molecular Formula	(C2H6OSi)n(C4H10OSi)m
Molecular Weight	Variable (Depends on m/n ratio and degree of polymerization)
Synonyms	Poly(dimethylsiloxane-co-methylvinylsiloxane), trimethylsiloxy terminated; Vinylmethyl silicone fluid; Vinyl Q resin intermediate; Methylvinyl-dimethyl polysiloxane; Vinyl-modified polydimethylsiloxane (Vi-PDMS); Poly(methylvinylsiloxane-dimethylsiloxane); Dimethyl, methylvinyl siloxane 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 consistency in key parameters such as vinyl content, viscosity, and molecular weight distribution. Certificates of Analysis (COA) detailing specifications 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). Keep away from strong acids, bases, and oxidizing agents. For long-term storage under an inert atmosphere (e.g., nitrogen), please contact us for specific recommendations based on the grade.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Viscosity (25°C)	50 - 100,000 cSt (Grade dependent)
Vinyl Content (mmol/g)	0.1 - 5.0 (Grade dependent)
Specific Gravity (25°C)	0.95 - 0.98
Refractive Index (nD25)	1.400 - 1.410
Volatile Content	≤ 1.0%
Identification (IR)	Conforms

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