Alpha Silane Water Scavenger & Chain Extender | Manta AM121

Manta AM121 is [(methylcarbamato)methyl]dimethoxymethylsilane (CAS 23432-65-7, ≥97% purity), an alpha-functional silane used as a water scavenger and chain extender in moisture-curing STP/MS, 1K polyurethane and hybrid adhesives and sealants. Its alpha-effect reactivity dries formulations during compounding while the dialkoxy structure builds low-modulus, high-elasticity elastomers; it is comparable to GENIOSIL XL 65.

Manta AM121 is a specialized alpha-organofunctional silane. Its unique molecular architecture features a nitrogen atom separated from the silicon atom by only a single methylene group. This extreme proximity induces the renowned “alpha-effect,” making its methoxy groups exceptionally reactive toward moisture compared to conventional gamma-silanes.

Because of this hyper-reactivity combined with its bifunctional (dialkoxy) structure, Manta AM121 acts simultaneously as a powerful water scavenger and a highly effective chain extender. It is an indispensable compounding additive for high-performance, moisture-curing adhesives and sealants where extreme storage stability and high elasticity are required.

It is equivalent to the industry benchmark WACKER GENIOSIL XL 65.

Features

1. Superior Water Scavenging: The alpha-effect drives immediate reaction with trace moisture during compounding and packaging, dramatically extending the shelf life and storage stability of moisture-sensitive polymer formulations.
2. Chain Extension (Low Modulus): The dialkoxysilyl configuration ensures that, during the curing phase of the prepolymer, AM121 acts as a linear chain extender rather than a 3D crosslinker. This results in elastomers with a significantly lower degree of crosslinking, yielding highly flexible, low-modulus products.
3. Room Temperature Reactivity: Cures extremely rapidly upon exposure to atmospheric moisture at room temperature without the need for heavy metal catalysts (like tin).

Manta AM121 unique molecular architecture features a nitrogen atom separated from the silicon atom by only a single methylene group. This extreme proximity induces the renowned “alpha-effect,” making its methoxy groups exceptionally reactive toward moisture compared to conventional gamma-silanes.

Because of this hyper-reactivity combined with its bifunctional (dialkoxy) structure, Manta AM121 acts simultaneously as a powerful water scavenger and a highly effective chain extender. It is an indispensable compounding additive for high-performance, moisture-curing adhesives and sealants where extreme storage stability and high elasticity are required.

It is equivalent to the industry benchmark WACKER GENIOSIL XL 65.

Manta AM121 is engineered for cutting-edge reactive polymer systems:

1. Silane-Terminated Polymers (STP/MS): Crucial in formulations utilizing highly reactive silane-modified polymers (e.g., alpha-STP systems). It guarantees robust moisture scavenging during production while enhancing the flexibility of the final cured sealant.
2. High-Movement Sealants: Specifically formulated for premium expansion joint sealants in construction and automotive industries, where low modulus of elasticity and extreme elongation are mandatory.
3. Advanced Adhesives: Used in moisture-curing polyurethane (1K PU) and hybrid adhesive systems to eliminate outgassing and extend pot-life/shelf-life.