Patent ID: 7491752

Claim:
Photoreactive dendrimers comprising a core portion, branching units and terminal groups, wherein at least one terminal group and/or branching unit is a photoreactive group, wherein the photoreactive groups are represented by the general formulae Ia and Ib: wherein the broken line indicates the point of linkage to the outermost generation of the dendrimer and A represents pyrimidine-2,5-diyl, pyridine-2,5-diyl, 2,5-thiophenylene, 2,5-furanylene, 1,4- or 2,6-naphthylene; or phenylene, which is unsubstituted or mono- or poly-substituted by fluorine, chlorine or by a cyclic, straight-chain or branched alkyl residue which is unsubstituted mono- or poly-substituted by fluorine, chlorine, having 1 to 18 carbon atoms, wherein one or more non-adjacent —CH 2 —groups may independently be replaced by a group C; wherein C represents a group selected from —O—, —CO—, —CO—O—, —O—CO—, —NR 1 —, —NR 1 —CO—, —CO—NR 1 —, —NR 1 —CO—O—, —O—CO—NR 1 —, —NR 1 —CO—NR 1 —, —CH═CH—, —C═C—, —O—CO—O— and —Si(CH 3 ) 2 —O—Si(CH 3 ) 2 —, wherein R 1 represents hydrogen or lower alkyl; B represents hydrogen, or a group which is able to react or interact with a second material like polymers, oligomers, monomers, photoactive polymers, photoactive oligomers and/or photoactive monomers or surfaces; S 1 and S 2 each independently of the other represent a single bond or a spacer unit such as a straight-chain or branched alkylene group which is unsubstituted, mono or poly-substituted by fluorine, chlorine, having 1 to 40 carbon atoms, wherein one or more non-adjacent —CH 2 — groups may independently be replaced by a group D, with the proviso that oxygen atoms are not directly attached to each other; wherein D represents a group selected from —O—, —CO—, —CO—O—, —O—CO—, —NR 1 —, —NR 1 —CO—, —CO—NR 1 —, —NR 1 —CO—O—, —O—CO—NR 1 —, —NR 1 —CO—NR 1 —, —CH═CH—, —C≡C—, —O—CO—O— and —Si(CH 3 ) 2 —O—Si(CH 3 ) 2 —, an aromatic or an alicyclic group, wherein R 1 represents hydrogen or lower alkyl; Q represents oxygen or —NR 1 — wherein R 1 represents hydrogen or lower alkyl; and X, Y each independently of the other represents hydrogen, fluorine, chlorine, cyano, alkyl optionally substituted by fluorine having 1 to 12 carbon atoms in which optionally one or more non-adjacent alkyl —CH 2 — groups are replaced by —O—, —CO—O—, —O—CO— and/or —CH═CH—.