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Dynasylan® 1189

1 of 42 products in this brand
Dynasylan® 1189 is a bifunctional silane, boasts a reactive secondary amine and hydrolyzable methoxysilyl groups. Its dual reactivity enables chemical binding to both inorganic materials (such as glass, metals, fillers) and organic polymers (like thermosets, thermoplastics, elastomers). Serving as an adhesion promoter, surface modifier, and catalyst for substance modification, Dynasylan® 1189 contributes to versatile applications.

Chemical Name: N-(3-(Trimethoxysilyl)propyl)butylamine

CAS Number: 31024-56-3

Functions: Adhesion Promoter, Coupling Agent, Crosslinking Agent, Sizing Agent, Surface Modifier

Chemical Family: Amines

Applicable Processes: Abrasives Manufacturing

Synonyms: N-(3-Trimethoxysilylpropyl)butan-1-amine

Knowde Enhanced TDS

Identification & Functionality

Chemical Family
Composite Materials Functions

Features & Benefits

Product Highlights
  • In the presence of water, the methoxy groups of Dynasylan® 1189 hydrolyze to form reactive silanol groups which can bond to a variety of inorganic substrates.
  • The organophilic n- butylamino group of Dynasylan® 1189 can react with a suitable polymer.
  • The hydrolysis of Dynasylan® 1189 in water takes place by acid catalysis (e.g. acetic acid at a pH of 3).
  • To achieve solubility in organic solvents 2-4 wt.-% of water per wt.-% of Dynasylan® 1189 should be added. After stirring for 5 hours the solutions are ready for use.
  • Examples of suitable inorganic substrates are glass, glass fibers, glass wool, wollastonite and kaolin.
  • Dynasylan® 1189 may be used with such polymers as epoxy, polyurethanes, PA, PBT, EVA, modified PP and silicones. In particular, Dynasylan® 1189 is a very effective coupling agent for thermoplastics. Superior mechanical properties can be achieved in reinforced MAA-modified PE or polypropylene matrices as well as polyamide.
  • Dynasylan® 1189 especially leads to improvement of the impact strength of polyamide.
  • Dynasylan® 1189 treated fibers and fillers deliver superior performance over standard aminosilanes in challenging environments.
  • Dynasylan® 1189 can be used as an endcapper for polyurethanes (isocyanatoprepolymer).In adhesives and sealants, Dynasylan® 1189 acts as an adhesion promoter, primarily to functionalize polymers with aminoreactive groups, for example isocyanate pre-polymers.
  • This function- alization with Dynasylan® 1189 leads to new and environmentally-friendly mois- ture curable binders which can be pro- cessed into adhesives and sealants with innovative property profiles.
  • In addition, the trialkoxysilicon function in Dynasylan® 1189 guarantees sufficiently quick cur- ing and high crosslinking density in the resulting end product.
  • Accelerates the production of silane- terminated PU binders (basis polymers) and thus their adhesives and sealants.
  • Reacts quickly and completely with free isocyanate groups to form hydro-phobic, thermally stable urea groups.
  • Produces high yields of very good, reproducible and mostly colorless polymers with low viscosity.
  • Causes no side reactions and no precuring undesirable for PU chemistry.
  • Efficient polar adhesion promoter with integrated non-polar alkyl group, results in adhesives and sealants with extremely high elasticity.
  • Rapid reaction with NCO groups, also without a catalyst.
  • Urea structure protected against hydrolysis through the butyl group.

Applications & Uses

Applicable Processes
Compatible Substrates & Surfaces
Coating Type
Industrial Additives End Use
Plastics & Elastomers End Uses
Application Characteristics

Dynasylan® 1189 has many important applications.

Examples include:

  • as a size constituent or finish for glass fiber/glass fabric composites
  • as an additive to phenolic, furan and melamine resins used in foundry resins
  • as a primer or additive and for the chemical modification of adhesives and sealants
  • for pretreatment of fillers and pigments used in mineral- filled polymers
  • as a primer and additive for improving the adhesion of paints and coatings to the substrate
  • as a high flexible adhesion promoter in SMP-systems.

The most important product effects that can be achieved using Dynasylan® 1189 include:

  • flexural strength, tensile strength, impact strength and modulus of elasticity
  • improved moisture and corrosion resistance Dynasylan® 1189 can also provide

Improvements in processing properties, such as

  • adhesion
  • filler dispersion
  • rheological behavior: reduction in viscosity
  • higher filler loading
  • For substrate pretreatments (inorganic fibers and fillers) Dynasylan® 1189 can be applied as a primer as a constituent of an aqueous size or solution, neat or added to the polymer as an additive.
  • For substrate pretreatment a concentration of approx. 0.5-2 percent is recommended.
  • Higher concentrations (1-5 wt.-%) achieve chemical modification by reaction with suitable functional monomers or polymers, for example those containing isocyanate groups.
Substrate Recommendations

Recommended for : 

  • Steel: cold rolled steel (CRS). abraded surface 0.3 –0.6% Mn / 0.08 – 0.13% C / 0.05% S / 0.04% P
  • Aluminum: alloy (3105 H 24) 96.8 – 97.4% Al / 1.0– 1.5% Mn / 0.6% Si / 0.05 –0.2% Cu
  • Copper.


Physical Form
Colorless to slight yellowish liquid
Amine - like odor
Soluble in
Alcohols, Aliphatic or aromatic hydrocarbons
Technical Data
ValueUnitsTest Method / Conditions
Density (at 20°C)0.947g/cm³DIN 51757
Boiling Point (at 1013 hPa)238.0°CDIN 51751
Viscosity (at 20°C)2.5mPa.sDIN 53015
Flash Point110.0°C-
Residual Moisture0.2%-
Evolved VOC (Methanol)408.0g methanol/ kg

Regulatory & Compliance

Certifications & Compliance
Chemical Inventories

Technical Details & Test Data

Dynasylan® 1189 Test Data Information
  • The challenge: Bonding dissimilar and/or flexible substrates is always challenging for end users. They need an adhesive solution that exhibits high flexibility and long-term performance.
  • The solution: Dynasylan® 1189 is an accompanied adhesion promoter for moisture-curable SMP-based adhesives and sealants. When exposed to moisture and incorporated into the final siloxane network, Dynasylan® 1189 exhibits specifically high flexibilities. Further important side effects of formulating Dynasylan® 1189 are better chemical and moisture resistance of the finished products. Moreover, Dynasylan® 1189 is used to functionalize- polymers with amino-reactive groups such as isocyanate pre-polymers. This functionalization results in new and environmentally friendly moisture-curable binders.
High Flexibility for Adhesives and Sealants
  • As shown in the graph below, a STPU sealant formulated with Dynasylan® 1189 exhibits a low modulus (100%) indicating that the sealant is not rigid:

Modulus (100 %) with Dynasylan® adhesion promoters in cured STPU-sealant.

  • In addition, thanks to Dynasylan® 1189, the final STPU sealant showed a high elongation at break highlighting the deformation capacity of the sealant:

Elongation at break with Dynasylan® adhesion promoter in cured STPU sealant.


Improved Moisture Resistance
  • Dynasylan® 1189 enables formulators to keep adhesives or sealants overall performance (adhesion and other) even when they are exposed to a humid environment.
  • As an example, Dynasylan® 1189 helps to improve the shear resistance of a STPU sealant even when a joint is immersed 6 days in water:

Lap shear strength of an STPU sealant after 6 days aging in water at RT (Test performed on aluminum at 23°C)

Enhanced Chemical Resistance

Not only when exposed to humid environments but also when in contact with harsh chemicals, adhesives or sealants formulated with Dynasylan® 1189 maintain their performance. When used in STPU sealants, Dynasylan® 1189 helps to improve the shear resistance even when joints are immersed 22 days in Isopropanol:

Lap shear strength of an STPU sealant after 22 days aging in Isopropanol (Test performed on aluminum).

Melt Flow Ratio
  • Reduced agglomeration is a consequence of improved dispersion of the inorganic in the organic matrix. Also the melt flow ratio of the compound is significantly increased.
  • The better the choice of silane, the better the compatibilizing effect in the final compound (see diagram).

Positive impact of Dynasylan® on Melt-Flow Ratio (MFR)

  • Melt-Flow Ratio (MFR) is increased by a factor of at least four through use of silanes.
  • Melt flow ratio of a MDH / PP / PP-MAH compound with different silanes

Dynasylan® – Significant reduction of water uptake 

  • Water uptake is reduced by a factor of four through use of silanes.

Packaging & Availability

Packaging Type
Packaging Information

Dynasylan® 1189 is supplied in 25 kg pails, 190 kg drums and 800 kg containers.

Storage & Handling

Shelf Life
12 months