CPC C09J 7/29 (2018.01) [B29C 48/022 (2019.02); B29C 48/08 (2019.02); B32B 27/06 (2013.01); B32B 27/40 (2013.01); C08G 18/3206 (2013.01); C08G 18/42 (2013.01); C08G 18/4238 (2013.01); C08G 18/664 (2013.01); C08G 18/758 (2013.01); C08J 5/18 (2013.01); C09D 175/06 (2013.01); C09J 7/25 (2018.01); C09J 7/38 (2018.01); B29K 2075/00 (2013.01); B29L 2007/008 (2013.01); B32B 2307/412 (2013.01); B32B 2405/00 (2013.01); C08J 2375/06 (2013.01); C09J 2475/006 (2013.01)] | 14 Claims |
1. A surfacing film comprising the following layers in the sequence listed:
clear coat comprising a thermosetting polyurethane,
an extruded base layer in direct contact with the clear coat, wherein the base layer comprises:
a thermoplastic polyurethane film comprising a reaction product of a reaction mixture comprising:
a diisocyanate; and
a polyester polyol having a melting temperature of at least about 30° C.; and
a diol chain extender,
wherein a weight-average molecular weight of the thermoplastic polyurethane film is in a range of from about 80,000 daltons to about 400,000 daltons, wherein the thermoplastic polyurethane film comprises a hard segment in a range of from about 30 wt % to about 49 wt %,
wherein the base layer has a Shore A hardness from about 70A to about 95A
pressure-sensitive adhesive layer in direct contact with the base layer on the opposite side as the clear coat,
a releasable carrier web or liner in direct contact with the pressure sensitive adhesive on the opposite side as the base layer.
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10. A method of making a surfacing film, the method comprising the steps of:
forming a base layer by a process comprising:
introducing components comprising a diisocyanate, a diol chain extender, and a polyester polyol into an extruder to provide a molten thermoplastic polyurethane, wherein the polyester polyol has a melting temperature of at least 30° C.;
extruding the molten thermoplastic polyurethane through a die onto a carrier web as a uniform film; and
solidifying the thermoplastic polyurethane film to obtain the base layer, wherein a weight-average molecular weight of the thermoplastic polyurethane film is in a range of from about 80,000 daltons to about 400,000 daltons,
laminating a pressure sensitive adhesive layer onto a first major surface of the base layer,
laminating a clear coating comprising a thermosetting polyurethane onto a second major surface of the base layer,
providing a releasable carrier web or liner in direct contact with the pressure sensitive adhesive on the opposite side as the base layer;
wherein the thermoplastic polyurethane film comprises a hard segment in a range of from about 30 wt % to about 49 wt %,
wherein the base layer has a Shore A hardness from about 70A to about 95A.
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