US 10,294,373 B2Granted

Method of reducing iridescence

AssigneeToray Plastics (America), Inc.

InventorTracy A. Paolilli

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Abstract

This invention relates to an optically clear film of predominantly thermoplastic polyester base layer and a carbodiimide-crosslinked, polyester and polymethylmethacrylate blend primer layer. The base layer preferably has a particle-free core layer and outer layers containing nonpolyester, organic and/or inorganic particles. The primer layer is preferably applied to the base layer from solution that is organic solvent-free. The primer layer and base layer composite can be laminated with a protective layer of primarily acrylic polymer to form a solar control film. Functional additives, such as UV light blockers, can be present in various layers of the solar control film. Polymethylmethacrylate in the primer, especially in combination with crosslinking by the carbodiimide, provides the acrylic coated polyester base solar control film with notably reduced iridescence. Adhesion between the acrylic layer applied from organic solvent solutions and the polyester layers is durable in moist and warm service conditions.

Claims10

Dependent claims

A method of making an optically clear reduced iridescent composite film comprising the steps of:

(A) providing a mixture consisting essentially of an iridescence reducing agent of polymethylmethacrylate particles and polyester binder particles of a polyester resin having a softening point lower than 100° C. uniformly dispersed in a predominantly aqueous medium of carbodiimide crosslinking agent dissolved in water, in which the polymethylmethacrylate particles have particle sizes in the range of about 1 μm to about 10 μm,
(B) providing a base layer comprising a core layer of polyester film of thickness in the range of about 1-500 μm and optionally comprising about 0.1 to 2 wt % of a UV light absorber composition,
(C) depositing a wet coating of the mixture onto one side of the base layer, and
(D) heating the base layer and wet coating effectively to (i) soften the polyester binder, (ii) evaporate substantially all volatile components of the predominantly aqueous medium, and (iii), activate the crosslinking agent, thereby creating an optically clear film of iridescence-reducing solidified primer layer in contact with the one side of the base layer,
in which the wet coating on the base layer is present in an amount effective to produce a thickness of the solidified primer layer in the range of about 0.03-0.15 μm.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/130,974Filed 16 Apr 2016 · continuation
Priority: 2 Aug 2011
Published: US 2016/0244616 A125 Aug 2016
Granted: 21 May 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification28 codes

C09D 5/002
Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced ; Filling pastes: priming…
B05D 3/007
Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate…:…
B32B 7/12
Interconnection of layers: using interposed adhesives or interposed materials with bonding properties
B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin

Family

Application61/514,280Us provisional application · filed 2 Aug 2011
Application13/337,144Parent of this continuation-in-part · filed 25 Dec 2011
Application13/688,181Parent of this continuation · filed 28 Nov 2012
US 2016/0244616 A1Pre-grant publication · published 25 Aug 2016
US 9,109,138 B2Parent of this continuation-in-part
Application13/688,181Parent of this continuation-in-part
US 2013/0034710 A1Published application
US 2013/0089721 A1Published application
US 10,294,373 B2This patent

From the US filing history. Foreign family members aren’t listed.