Orthodontic articles comprising polyester urethane (meth)acrylate polymer and monofunctional (meth)acrylate monomer, methods, and polymerizable compositions

An orthodontic article comprising the reaction product of a polymerizable composition, the polymerizable composition comprising:

• a) at least 35 wt. % and no greater than 70 wt. % of one or more monofunctional (meth)acrylate monomers comprising a cyclic moiety, based on the total weight of organic components of the polymerizable composition, wherein at least one of the one or more monofunctional (meth)acrylate monomers is characterized by a homopolymer Tg of at least 60° C., and wherein the polymerizable composition comprises one or more monofunctional (meth)acrylate monomers having a log P value of less than 3 in a total amount of no greater than 10 wt. % of the total monofunctional (meth)acrylate monomers;
• and
• b) a urethane (meth)acrylate polymer comprising polymerized units of an aliphatic polyester diol,
• wherein the orthodontic article is an orthodontic alignment tray,
• wherein a total amount of monofunctional (meth)acrylate monomers is no greater than 70 wt. %, based on the total weight of organic components of the polymerizable composition,
• wherein the reaction product is characterized by a peak tan delta temperature of greater than 60° C., as determined according to dynamic mechanical analysis at a temperature sweep at a rate of 2° C./min from −60° C. to 200° C. after conditioning in deionized water at 37° C. for 24 hours, and
• wherein the Tg is measured by Differential Scanning calorimetry at a heating rate of 10° C. per minute.