POLYURETHANE COMPOSITION USEFUL AS A FISSURE SEALANT

摘要

1392104 Dental sealants LEE PHARMACEUTICALS 24 May 1972 [24 May 1971] 13351/74 Divided out of 1392103 Heading ASB [Also in Division C3] Fissure sealants for tooth structures comprise a polyurethane prepared by reacting together (a) a hydroxy-terminated butadiene prepolymer having an average M.W. of 400-25,000 and containing 1-3 hydroxyl groups per molecule, (b) an aromatic polyol, e.g. N, N-bis (hydroxypropyl)aniline, in an amount such as to provide 42-60 wt% of the total hydroxyl components, and (c) a polyisocyanate reactant in an amount such as to provide from 1.5 to 2.7 isocyanate groups for each hydroxyl group or active hydrogen site. The composition may contain a filler, e.g. titanium dioxide, and may also contain N-(#-aminoethyl)-aminopropyltrimethoxysilane to improve adhesion to the tooth. Alternatively, the tooth may be pretreated with a silane coupling agent.