Patent ID: 8044172

Claim:
Cell-occlusive membrane formed by reaction of at least two precursors in the presence of water, wherein a first precursor A comprising a core carrying n chains each having a conjugated unsaturated group or a conjugated unsaturated bond attached to any of the last 20 atoms of the chain and a second precursor B comprising a core carrying m chains each having a thiol group attached to any of the last 20 atoms of the chain, wherein m is 2 to 8, n is 4 to 8, the first precursor A and the second precursor B forming a three dimensional network with crosslinking-points, wherein each core of the precursors forms a crosslinking-point if m and n are greater than 2, and if m is equal to 2 the corresponding crosslinking-point is the core of the adjacent first precursor A, and the adjacent crosslinking-points are connected by a chain having less than 330 atoms.