Isocyanatopropylmethyldiethoxysilane | Manta S122

Manta S122 is (3-isocyanatopropyl)methyldiethoxysilane (CAS 33491-28-0, ≥96% purity) used to end-cap polyols in the synthesis of low-modulus silane-modified polymers (SMP) and SPUR systems for high-movement joint sealants. Unlike methoxy analogues it releases ethanol rather than methanol on hydrolysis, and it is comparable to Shin-Etsu KBE-9207.

Manta S122 is our ultimate flagship isocyanate-functional silane, featuring a highly reactive isocyanate group and a methyldiethoxy silyl group. This unique molecular architecture combines two highly sought-after formulation benefits:

It undergoes hydrolysis to release safe, non-toxic ethanol (unlike methoxy variants), ensuring strict environmental compliance.

Its dialkoxy structure acts as a linear chain extender, dramatically reducing crosslink density to produce ultra-flexible, low-modulus elastomers.

It is the premier end-capping agent for formulators demanding both extreme elongation capabilities and uncompromising eco-friendly profiles.

It is the exact chemical equivalent to industry standards such as Shin-Etsu® KBE-9207.

Properties

1. Eco-Friendly Byproduct: Releases non-toxic ethanol upon moisture curing, bypassing stringent restrictions on methanol-releasing chemicals.
2. Ultra-High Flexibility: The presence of the methyl group limits 3D crosslinking, acting as a superior chain extender to yield low-modulus, high-movement sealants and coatings.
3. Rapid Reactivity: The active isocyanate group bonds instantly with active hydrogen species (amines, hydroxyls, polyols).
4. Adhesion Promotion: Enhances wet and dry adhesion of polymer systems to challenging inorganic substrates without sacrificing coating flexibility.

Manta S122 is the ultimate raw material for high-end polymer synthesis:

1. Premium Polymer End-Capping: The ultimate choice for end-capping polyols in the synthesis of Silane-Modified Polymers (SMP / MS Polymer) and SPUR systems destined for the European and North American green-building markets.
2. High-Movement Joint Sealants: Critical for formulating expansion joint sealants that require massive thermal expansion/contraction capabilities without cohesive failure.
3. Eco-Friendly Adhesives & Coatings: Used as an additive or modifier in polyurethane systems where safety, low VOCs, and high flexibility are mandatory.