CNRS Technologies

Find the best CNRS technologies to boost your innovative project.

Les brevets les plus récents

You are a research scientist?

We can guide you through the whole technology transfer process.

See all our services

You are a corporate player?

Thanks to our expertise, our network and our know-how of the innovation ecosystem, we support you throughout your project.

Contact us

Follow our news and upcoming events

Discover CNRS technologies

Meet our team


New photoinitiator based on bifunctional silane



Statut des brevets

French priority patent application filed on November 16th, 2017 and entitled “Nouveaux photoamorceurs à base de silane bifonctionnel”

PCT extension to be filed on November 16th, 2018



Statut commercial

Exclusive or non-exclusive license



LCS – Laboratoire Catalyse et Spectrochimie


UMR 6506, Caen, France



Incorporating mineral fillers into polymers is a commonly used process to improve their mechanical, chemical or optical properties. Silica nanoparticles are the most used in polymers reinforcing. Due to their hydrophilic surface, these particles are modified with bifunctional silane to form a chemical bond between the nanoparticles (using the ethoxysilane moieties) and the polymer matrix (using the sulfur group). The composite material is obtained by a reaction triggered by heat (for example 170 °C in the case of vulcanization). For the fabrication of materials incompatible with heat or sulfur, the process relies more and more on photopolymerization. Incorporation of silica to improve mechanical properties of the materials is possible, but up to now the silica/polymer coupling remains low.

This invention reveals a new generation of photoinitiators combining a grafting group and a photoinitiator, contrary to current coupling agents comprising only the grafting group.

Technical description

The photoinitiators of the invention are made of a bifunctional silane (type SPI-1, Silane-based photoinitiator) grafted on the silica nanoparticles used as mineral filler in the to-be-formed polymer.

The surface of the modified silica nanoparticles becomes hydrophobic, allowing a better dispersion of the filler in the polymer matrix. After photopolymerization, the bond between the silica nanoparticles and the polymers is strong, leading to durable composite materials.

Development stage

Several chemical structures obtained, to adapt the molecules to the wavelength of the UV-visible light source used in the photopolymerization process.

Gram-scale production.


  • Better silica dispersion
  • Improved stability / durability of the composite materials

Industrial applications

Photopolymerizable resins and polymers

Materials for dental applications

Photopolymerizable inks

Additive manufacturing / 3D printing

Medical devices

Besoin de plus d'informations ?

Nous contacter


  • This field is for validation purposes and should be left unchanged.

Les brevets les plus récents