Paint replacement film with polymer layer containing polyurethane

Abstract

A paint replacement film comprising a polymer layer comprising a polyurethane produced from a formulation comprising at least one blocked isocyanate. The paint replacement film comprises a liner layer and the formulation comprises at least two polyols in OH weight equivalent ratio in the range 4.5:1 to 1:4.5. The formulation may comprise a colourant and the polyurethane may have a glass transition temperature (Tg) below 42° C. Also disclosed is a method of producing a paint replacement film, by providing a backing layer, providing the liquid formulation, cast-coating the backing layer with the liquid formulation, and gelling the liquid formulation, thereby forming a polymer layer comprising polyurethane. The paint replacement films are useful for replacing paint on surfaces especially in automotive applications.

1 . A paint replacement film comprising at least one coloured polymer layer and a liner layer, wherein the at least one coloured polymer layer comprises a colourant and a polyurethane produced from a formulation comprising at least one blocked isocyanate, and the formulation comprises at least two polyols in an OH weight equivalent ratio in the range 4.5:1 to 1:4.5. 
     
     
         2 . A paint replacement film as claimed in  claim 1 , wherein the polyurethane has a glass transition temperature (Tg) according to ASTME 1640-09 standard below 42° C. 
     
     
         3 . A paint replacement film as claimed in  claim 1 , wherein the polyurethane has a glass transition temperature (Tg) according to ASTME 1640-09 standard below 40° C. 
     
     
         4 . A paint replacement film as claimed in  claim 1 , wherein the polyurethane has a glass transition temperature (Tg) according to ASTME 1640-09 standard below 38° C. 
     
     
         5 . A paint replacement film as claimed in  claim 1 , further comprising an adhesive layer. 
     
     
         6 . A paint replacement film as claimed in  claim 5 , wherein the adhesive layer is a microstructured adhesive layer. 
     
     
         7 . A paint replacement film as claimed in  claim 1 , wherein the liner layer is a microstructured liner layer. 
     
     
         8 . A paint replacement film as claimed in  claim 1 , wherein the polyurethane has an elongation to break of greater than 80% according to DIN ISO 527/3/2/300. 
     
     
         9 . A paint replacement film as claimed in  claim 1 , wherein the at least one blocked isocyanate comprises a blocked aliphatic isocyanate. 
     
     
         10 . A paint replacement film as claimed in  claim 1 , wherein the polymer layer has a thickness in the range 20 μm to 200 μm. 
     
     
         11 . A paint replacement film as claimed in  claim 1  further comprising a backing layer. 
     
     
         12 . A method of covering a surface, the method comprising,
 providing a paint replacement film as claimed in  claim 1 ,   removing the liner layer of the paint replacement film, and   applying the polymer film to the surface.   
     
     
         13 . A motor vehicle having at least one surface, with at least a portion of said surface being covered with a paint replacement film adhered to the surface, the paint replacement film comprising a polymer layer comprising a polyurethane produced from a formulation comprising at least one blocked isocyanate, and the formulation comprising at least two polyols in an OH weight equivalent ratio in the range 4.5:1 to 1:4.5. 
     
     
         14 . The motor vehicle as claimed in  claim 13 , wherein the polymer layer is at least one coloured polymer layer comprising a colourant. 
     
     
         15 . The motor vehicle as claimed in  claim 14 , wherein the paint replacement film further comprises a microstructured adhesive layer. 
     
     
         16 . The motor vehicle as claimed in  claim 15 , wherein the polyurethane has a glass transition temperature (Tg) according to ASTME 1640-09 standard below 42° C., and the polyurethane has an elongation to break of greater than 80% according to DIN ISO 527/3/2/300. 
     
     
         17 . The motor vehicle as claimed in  claim 14 , wherein the at least one blocked isocyanate comprises a blocked aliphatic isocyanate. 
     
     
         18 . The paint replacement film as claimed in  claim 1 , wherein the polyurethane has a glass transition temperature (Tg) according to ASTME 1640-09 standard below 42° C., the polyurethane has an elongation to break of greater than 80% according to DIN ISO 527/3/2/300, the at least one blocked isocyanate comprises a blocked aliphatic isocyanate, and the polymer layer has a thickness in the range 20 μm to 200 μm.