Paint replacement film with polymer layer containing polyurethane

Patent metadata

Field	Value
Publication number	US-2016130467-A1
Application number	US-201414897119-A
Country	US
Kind code	A1
Filing date	Jun 24, 2014
Priority date	Jun 24, 2013
Publication date	May 12, 2016
Grant date	—

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 (T g ) 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.

First claim

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 (T g ) 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 (T g ) 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 (T g ) 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 producing a paint replacement film, the method comprising,
providing a backing layer, providing a liquid formulation comprising at least two polyols in an OH weight equivalent ratio in the range 4.5:1 to 1:4.5 and one or more blocked isocyanates, cast-coating the backing layer with the liquid formulation, and gelling the liquid formulation, thereby forming a polymer layer comprising polyurethane, wherein the polymer layer is a coloured polymer layer comprising a colourant.

13 . A method as claimed in claim 12 , wherein gelling the liquid formulation comprises heat-treating the liquid formulation to a de-blocking temperature at or above which a, or each, blocked polyurethane precursor dissociates thereby allowing the liquid formulation to gel.

14 . 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.

15 . 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.

16 . The motor vehicle as claimed in claim 15 , wherein the polymer layer is at least one coloured polymer layer comprising a colourant.

17 . The motor vehicle as claimed in claim 16 , wherein the paint replacement film further comprises a microstructured adhesive layer.

18 . The motor vehicle as claimed in claim 17 , wherein the polyurethane has a glass transition temperature (T g ) 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.

19 . The motor vehicle as claimed in claim 17 , wherein the at least one blocked isocyanate comprises a blocked aliphatic isocyanate.

20 . The paint replacement film as claimed in claim 1 , wherein the polyurethane has a glass transition temperature (T g ) 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.

Assignees

• 3M Innovative Properties Co

Inventors

• Fuchs Iris L

Classifications

• C09J7/403

  characterised by the structure of the release feature · CPC title

• B32B2605/00

  Vehicles · CPC title

• C08G18/4202

  Two or more polyesters of different physical or chemical nature (C08G18/44 takes precedence) · CPC title

• C09J7/21

  Paper; Textile fabrics · CPC title

• C08G18/44

  Polycarbonates · CPC title