Akzo Nobel N.v.

Jds Uniphase Photonics C.v.

Richard Herman Woudenberg

Tjerk Oedse Boonstra

David Van Olden

Antoon Jacob Berend Ten Kate

Johannes Willem Hofstraat

Ulfert Elle Wiersum

Carolina Anna Maria Christina Dirix

Faysal Kalmoua

Eilertdina Henderika Renkema

Heert Andringa

Tim Baks

Marinus Cornelis Flipse

Johannes Wilhelm Ladage

The present invention relates to a process for the catalytic halogenation of an organic compound comprising at least one vicinal diol moiety, said process comprising a step of bringing the organic compound comprising at least one vicinal diol moiety into contact with a hydrogen halide in the presence of a catalyst, characterized in that the catalyst is an organic compound comprising a &#x3b2;-diketone moiety or a &#x3b2;-keto aldehyde moiety.

Process for the catalytic halogenation of a diol

Process for preparing 1-indanones

Process for preparing bisindenylalkanes

The invention pertains to a cross-linkable fluorinated polymer comprising the carbonate moiety having formula (I) wherein n&equals;1-10 and m&equals;0-9. Preferably, the polymer further comprises a cross-linkable moiety derived from a diol selected from (II) and (III) wherein A, A , and A are independently a bond or C alkylene, or together with the carbon atoms to which they are bonded form a 5- or 6-membered ring; B is independently O or C alkyl; Q is &mdash;CO&mdash;C(&equals;E)D, wherein D is H or C alkyl, and E is C alkylidene; and each of the alkyl, alkylene, and alkylidene groups may be halogenated. The polymers of the invention can be used in cladding layers or waveguides, in particular for thermo-optical devices.

Polymers comprising a fluorinated carbonate moiety

The invention pertains to a cross-linker of the formula

Cross-linkers for cross-linkable optical polycarbonates

The invention relates to a process of preparing a 2-alkyl-2,3-dihydro-1H-benz�e!indene-1-one derivative, preferably 2,3-dihydro-2-methyl-benz�e!indene-1-one, characterized in that a naphthalene derivative is condensed with an active ester of 2-alkyl-2-propenoic acid, preferably with 2-methyl-2-propenoyl chloride. The product which is obtained in high yield and substantially free from its isomer is an intermediate in the preparation of rac-dimethyl bis(2-alkyl-1H-benz�e!indenyl)silandiyl zirconium dichloride complex.

Process of preparing 2-alkyl-2,3-dihydro-1H-benz �e!indene-1-one

Cross-linked or cross-linkable optical polycarbonates and optical

Non-linear optical polycarbonates

The present invention provides an electro-optical device comprising NLO polymer in the active layer with improved stability for light in the wavelength range of 600-1600 nm is guided through the device. The present invention is directed to an electro-optical device comprising two cladding layers and an active layer sandwiched between these cladding layers, with the active layer comprising a non-linear optically active side chain polymer with NLO-chromophores having an N-donor-delocated .pi. system-acceptor structure, the N-donor not being bonded directly to alkyl groups. There are two ways to create NLO-chromophores with N-donors which do not have adjacent linear alkyl groups: The first way is to bond one or two aromatic groups. The N-atom is further bonded to the delocated .pi. system. If only one aromatic group is present, the N-atom is, besides the delocated system, further bonded to a hydrogen or deuterium atom. The second way of avoiding adjacent alkyl groups is to employ an N-donor moiety wherein no adjacent linear alkyl groups are present.

Electro-optical device stable in the 600-1600 nanometer wavelength range

Growing community of inventors

Elst, Netherlands

Richard Herman Woudenberg