Paint replacement film with polymer layer containing polyurethane

Patent metadata

Field	Value
Publication number	US-10253209-B2
Application number	US-201414897119-A
Country	US
Kind code	B2
Filing date	Jun 24, 2014
Priority date	Jun 24, 2013
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

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 colorant 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.

First claim

The invention claimed is:

1. 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 and further wherein the polyurethane has a glass transition temperature (T g ) according to ASTME 1640-09 standard below 42° C.

2. A method as claimed in claim 1 , 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.

Assignees

• 3M Innovative Properties Co

Inventors

• Fuchs Iris L

Classifications

• C09J7/403

  characterised by the structure of the release feature · CPC title

• B32B2405/00

  Adhesive articles, e.g. adhesive tapes · CPC title

• B32B27/40

  comprising polyurethanes · CPC title

• C08G18/4063

  Mixtures of compounds of group C08G18/62 with other macromolecular compounds · CPC title

• C08G18/8093

  Compounds containing active methylene groups · CPC title