Patent ID: 8623130

Claim:
A sulphur cement pre-composition, comprising sulphur and a first organosilane, having general formula (I) or (II): (R 1 O) 3 Si-A (I) (R 1 O) 3 Si-A′-Si(OR 2 ) 3 (II) wherein R 1 and R 2 are C 1-6 alkyl, A is a univalent functional group comprising one or more groups chosen from thiol, sulphide, amine or alkenyl groups, and A′ is a divalent functional group comprising one or more groups chosen from thiol, sulphide, amine or alkenyl groups; and comprising a second organosilane, having general formula (III) or (IV): (R 3 O) 3 Si—B (III) (R 3 O) 3 Si—B′—Si(OR 4 ) 3 (IV) wherein R 3 and R 4 are C 1-6 alkyl, B is a univalent functional group that does not comprise any thiol, sulphide, amine or alkenyl groups and B′ is a divalent functional group that does not comprise any thiol, sulphide, amine or alkenyl groups.