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US 2020/0346449 A1Published application
Multilayer polymer sheets
AssigneeAlign Technology, Inc.
InventorsChunhua LI, Yan Chen, Heinz Pudleiner, Klaus Meyer, Joerg Nickel, Craig Pehlert
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Abstract
Multilayer polymer sheets are provided, as well as related methods, systems, and appliances.
Claims19
A multilayer sheet comprising:
- a first outer polymer layer comprising co-polyester and a second outer polymer layer comprising co-polyester, each of the first and second outer polymer layers having a hardness of about 60 A to about 85 D;
- and
- an inner polymer layer comprising thermoplastic polyurethane.
A multilayer sheet comprising:
- a first outer polymer layer comprising co-polyester and a second outer polymer layer comprising co-polyester, each of the first and second outer polymer layers having a flexural modulus of greater than about 35,000 psi;
- and
- an inner polymer layer comprising thermoplastic polyurethane, the inner polymer layer having an elongation at break of greater than about 70%.
Dependencies are inferred from the claim text.