Stand alone thermoforming separator film
AssigneeBay Materials, LLC
InventorsRay F. Stewart, John Lahlouh
Life of this patent
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Abstract
Improved separator film compositions, methods and systems for use in producing thermoformed dental appliances are disclosed.
Claims21
1-20. (canceled)
A detached releasable separator film, for use with a thermoformable sheet material in forming a thermoformed dental appliance, the detached releasable separator film comprising a polypropylene co-polymer having a melting point from about 60° C. to about 150° C. or a polyolefin having (i) an average thickness of from about 37 to 75 microns;
- (ii) a melting point of from about 60° C. to about 200° C.;
- and (iii) a trouser tear strength of greater than 20 N/mm.
A thermoformed dental appliance comprising a releasable separator film attached to a thermoformed sheet of a thermoformable polymeric sheet material, wherein the thermoformed sheet is conformal to one or more teeth, and wherein the releasable separator film comprises a polypropylene co-polymer having a melting point from about 60° C. to about 150° C. or a polyolefin having (i) an average thickness of from about 37 to 75 microns;
- (ii) a melting point of from about 60° C. to about 200° C., and which is lower than a thermoforming temperature of the thermoformable polymeric sheet material;
- and (iii) a trouser tear strength of greater than 20 N/mm.
Dependencies are inferred from the claim text.