Description

(Tetramethylpiperidinyl)Oxypropylmethylsiloxane-Dimethylsiloxane Copolymer, Trimethylsiloxy Terminated is a specialized organosilicon polymer that incorporates a hindered amine light stabilizer (HALS) moiety directly into the siloxane backbone. This unique molecular architecture provides exceptional durability and long-term performance as a polymer additive. It is primarily used by formulators in the plastics, coatings, and specialty elastomer industries seeking to enhance the UV resistance and thermal stability of their high-performance products.

Application

• As a reactive or non-reactive UV stabilizer in silicone-based sealants, adhesives, and high-temperature resins.
• An essential additive for improving the weatherability and lifespan of automotive coatings, industrial paints, and protective films.
• Used in the compounding of engineering plastics (e.g., polyolefins, polyamides) to prevent photo-oxidative degradation.
• Enhances the thermal and light stability of fiber optics, cable insulation, and other polymer-based electrical components.
• Formulation component for silicone rubber products exposed to outdoor environments, preventing cracking and loss of mechanical properties.
• Acts as a synergistic stabilizer in combination with other antioxidants and UV absorbers in advanced polymer systems.

Basic Information

Product Name	(Tetramethylpiperidinyl)Oxypropylmethylsiloxane-Dimethylsiloxane Copolymer, Trimethylsiloxy Terminated
CAS No.	182635-99-0
Molecular Formula	Contact for details
Molecular Weight	Variable (Polymer)
Synonyms	Poly[dimethylsiloxane-co-[3-[(2,2,6,6-tetramethyl-4-piperidinyl)oxy]propyl]methylsiloxane], trimethylsiloxy-terminated; HALS-functionalized polysiloxane; Siloxane copolymer with hindered amine; UV-stabilizing silicone fluid; Polymeric HALS-siloxane; Tetramethylpiperidineoxypropyl methylsiloxane-dimethylsiloxane copolymer; Reactive silicone-based light stabilizer.
EINECS	Contact for details

Quality Control

Our production of this advanced polymer additive adheres to strict quality management systems. Each batch is characterized using advanced analytical techniques including GPC, NMR, and FTIR to ensure consistent molecular architecture and functional group content. Certificates of Analysis (COA) detailing key parameters such as active content, viscosity, and appearance are provided with every shipment to guarantee product integrity and performance reliability.

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 oxidizing agents. Under recommended storage conditions, the product is stable for at least 24 months from the date of manufacture.

Specification

Item	Specification
Appearance	Clear to slightly hazy viscous liquid
Color	Colorless to pale yellow
Identification (IR)	Conforms to structure
Active HALS Content	Contact for details
Viscosity (25°C)	Specified per grade
Specific Gravity (25°C)	0.95 - 1.05
Refractive Index (n20D)	1.40 - 1.45

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