Patent ID: 7541392

Claim:
An uncured dental composite material comprising: (A) a polymerizable (meth)acrylic ester component comprising: (1) a compound of Formula I: wherein: each R 1 is independently hydrogen or methyl; each R 2 is an alkylene having 2 to 14 carbon atoms, or an alkenylene having 2 to 8 carbon atoms, or a divalent alicyclic hydrocarbon having 5 to 14 carbon atoms, or a phenylene which is optionally substituted with halogen or an alkyl group having 1 to 5 carbon atoms; each R 3 is independently selected from hydrogen, acetyl, methyl, ethyl, C 3-6 linear or branched alkyl, or benzyl; R 7 is independently selected from hydrogen, methyl, ethyl, C 3-6 linear or branched alkyl, phenyl, or benzyl; and each A is a repeat unit of the formula: wherein: each R 4 is independently an alkylene having 2 or 3 carbon atoms, each R 5 is independently an alkylene having 2 to 7 carbon atoms, each R 6 is independently an alkylene having 2 to 5 carbon atoms, m is an integer of 1 to 10, and n is an integer of 1 to 10; and (2) at least one reaction product produced by a process comprising: (a). preparing a hyperbranched polyester polyol by heating a mixture that includes (i) dimethylol propionic acid; (ii) caprolactone; and, optionally, (iii) pentaerythritol; (b). combining the product of step (a) with methacrylic anhydride, provided that the resulting degree of end capping is at least 25%, with radically polymerizable end groups constituting at least 25% of all end groups; (B) at least one polymerization initiator compound; and (C) at least one filler.