Film comprising polyamide polyurethane layer
Assignee3M Innovative Properties Company
InventorsYongshang Lu, Charlie C. Ho
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Abstract
A multilayer film is described comprising a first film layer comprising an organic polymeric material, wherein the first film layer has an elongation of at least 250%; and a second film layer comprising a crosslinked polyurethane wherein the polyurethane comprises polymerized units of a polyamide. In some embodiments, the organic polymeric material of the first film layer comprises polyurethane. Also described is a method of protecting a surface of a motor vehicle and a method of making a multilayer protective film.
Claims18
A multilayer film comprising:
- a first film layer comprising an organic polymeric material, wherein the first film layer has an elongation of at least 250%;
- a second film layer comprising a crosslinked polyurethane wherein the polyurethane comprises polymerized units of a polyamide.
A method of making a multilayer protective film, the method comprising steps:
- (a) providing a first film layer comprising organic polymeric material, wherein the first film layer has an elongation of at least 200%;
- (b) forming a second film layer comprising an at least partially crosslinked polyurethane wherein the polyurethane comprises polyamide oligomer moieties;
- and
- bonding the first film layer and second film layer.
Dependencies are inferred from the claim text.