VPS 4721

VPS 4721 is a bifunctional organosilane with a reactive organic epoxide and hydrolyzable inorganic methoxysilyl groups. The dual nature of its reactivity allows VPS 4721 to bind chemically to both inorganic materials (e.g. glass, metals, fillers) and organic polymers (e.g. thermosets, thermoplastics, elastomers), thus functioning as an adhesion promoter, crosslinking agent and/or surface modifier. VPS 4721 is a nearly colorless liquid. It is soluble in alcohols, ketones and aliphatic or aromatic hydrocarbons.

Typical Applications

VPS 4721 is a novel ingredient for special formulations and can be used in many applications in different industries.
Examples are:
- glass fiber/glass fabric composites: as a finish or a size ingredient
- foundry resins: as an additive to polyurethane resins
- sealants and adhesives: as a primer or additive
- mineral filled composites: for pretreatment of fillers and pigments or as an additive to the polymer
- paints and coatings: as an additive and as a primer for improving adhesion to the substrate, especially glass and metal
- as an additive for polymer dispersions

Benefits at a glance

Important product effects that can be achieved through the use of VPS 4721 as an additive include:
- improved mechanical properties, such as flexural strength, tensile strength, impact strength and modulus of elasticity
- improved moisture and corrosion resistance
- improved electrical properties, for example dielectric constant, volume resistivity
- better adhesion on substrates
- crosslinking of suitable polymers and polymer dispersions
- imporved storage stability of formulations
VPS 4721 can be used for
- filler dispersions
- viscosity reduction
- increased filler loading
- non yellowing

Product Details

Technical Data Sheets

Further Information

Storage:

Please do not store above 35 °C or in the direct sunlight.

Packaging:

VPS 4721 is supplied in 25 kg, 180 kg drums and 1.000 kg bulk containers.

Shelf life:

In the unopened container VPS 4721 has a shelf life of min. 12 months from delivery.