| CPC A61C 7/08 (2013.01) [B33Y 70/00 (2014.12); B33Y 80/00 (2014.12); A61C 2201/00 (2013.01); B33Y 10/00 (2014.12)] | 17 Claims |
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1. A method for producing an orthodontic aligner, comprising:
i) selecting a crosslinkable resin; and
ii) shaping the aligner by crosslinking the crosslinkable resin to form a crosslinked polymer,
wherein selecting the crosslinkable resin includes a criterion that a crosslinked polymer obtained after crosslinking of the crosslinkable resin has a glass transition temperature Tg, determined by dynamic mechanical analysis at a frequency of 1/s DMA as peak tan δ, of 25° C. and ≤60° C., an elasticity modulus, determined by dynamic mechanical analysis as storage modulus E′ at a frequency of 1/s at 35° C., of ≥500 MPa and ≤4000 MPa, and a loss factor tan δ, determined by dynamic mechanical analysis at a frequency of 1/s at 35° C., of ≥0.08,
wherein the crosslinkable resin comprises a first monomer and a second monomer, said first monomer being a (meth)acrylic monomer whose homopolymer has a glass transition temperature, determined by dynamic mechanical analysis at a frequency of 1/s as peak tan δ, of ≤0° C., and said second monomer being a (meth)acrylic or styrenic monomer whose homopolymer has a glass transition temperature, determined by dynamic mechanical analysis at a frequency of 1/s as peak tan δ, of ≥60° C., and where the first monomer is present in a fraction of ≥5 to ≤40 weight %, based on a total weight of the resin, and the second monomer is present in a fraction of ≥20 to ≤80 weight %, based on the total weight of the resin.
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