PHOTOPOLYMERISABLE ORGANOSILICON COMPOSITION FOR GLUING AND SEALING OPTICAL ELEMENTS AND METHOD OF PREPARING BASE FOR SAID COMPOSITION Russian patent published in 2010 - IPC C09J183/04 C08G77/06 

FIELD: chemistry.

SUBSTANCE: invention relates to photopolymerisable adhesive compositions for gluing and sealing glass optical elements of different optical devices working on the border of visible and near UV band. The engineering problem lies in preparing a photopolymerisable organosilicon composition for gluing and sealing optical elements, which has high optical transmission in the wavelength range from 220 to 700 nm, has no intrinsic fluorescence and is distinguished by high versatility. A composition is disclosed, which has a base in form of a mixture of oligomers with general formula: R¹Si(CH₃)₂O-[Si(CH₃)₂O]_n-Si(CH₃)₂R², where R¹=OCH₂CH(CH₂Cl)-OCOC(CH₃)=CH₂, R₂=OH, OCH₂CH(CH₂Cl)-OCO-C(CH₃)=CH₂, 1.5-2.0 radicals with double bonds in a molecule; n=50-300, and a photoinitiator selected from benzyldimethylketal, hydroxypropylacetophenon and 1-hydroxycyclohexylphenylketone, added in amount of 1.5-0.5 pts.wt per 100 pts.wt of the mixture of oligomers. Also disclosed is a single step method of preparing a mixture of oligomers (bases), characterised by that α,ω-dichloroligodimethylsiloxane is reacted with glycidyl methacrylate (GMA) in the presence of a dimethylformamide (DMFA) catalyst.

EFFECT: availability of raw materials and high output.

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