Process for preparing polymeric films useful for blocking the transmission of near infra red light

• US 20050203233A1
• Filed: 12/15/2004
• Published: 09/15/2005
• Est. Priority Date: 12/15/2003
• Status: Abandoned Application

• Current Assignee: Performance Materials NA, Inc. (Dow, Inc.)
• Original Assignee: Performance Materials NA, Inc. (Dow, Inc.)
• Inventors: Hayes, Richard Allen, Fugiel, Richard A.
• Application Number:
  US11/013,499
• Publication Number:
  US 20050203233A1
• Time in Patent Office: Days
• US Class Current: 524/434
• CPC Class Codes: B32B 17/10633 Infrared radiation absorbing or reflecting agents
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 2250/02 2 layers
• CPC Class Codes: C08J 2429/14 Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C09D 5/32 Radiation-absorbing paints protection against X-, gamma- or corpuscular radiation G21F
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/257 Iron oxide or aluminum oxide
• CPC Class Codes: Y10T 428/2982 Particulate matter [e.g., sphere, flake, etc.]
• CPC Class Codes: Y10T 428/2998 including synthetic resin or polymer
• CPC Class Codes: Y10T 428/31 Surface property or characteristic of web, sheet or block
• CPC Class Codes: Y10T 428/31645 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31649 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31942 Of aldehyde or ketone condensation product

Abstract

The present invention is an infra red (IR)-blocking coating and a process for applying the IR-blocking coating onto the surface of a polymer. The process comprises the steps of dispersing an IR-blocking material in a mixture of solvent comprising a dissolved polymer and using standard printing processes to coat at least a portion of the surface of a bulk polymer, preferably a sheet or film. The present invention also provides safety glass laminates whose polymer interlayers have improved adhesion to glass in addition to light blocking properties.

Claims

1. A polymer having a surface that is at least partially covered with a coating comprising infra red blocking particles, wherein the polymer is in the form of a film or sheet.

2. The polymer of claim 1, wherein the infra red blocking particles comprise a material selected from the group consisting of indium tin oxide (ITO), antimony tin oxide (ATO), lanthanum hexaboride, and iron oxides.

3. A composition which is a dispersion comprising Indium Tin Oxide (ITO) and polyvinylbutyral in dimethyl formamide (DMF).

4. The composition of claim 3, comprising 8 wt % of 23% free hydroxyl polyvinylbutyral.

5. A process for preparing a polymeric film or sheet having at least one surface that is at least partially covered with an infra red blocking coating comprising the step of applying the infra red blocking coating to the polymeric film or sheet by printing.

6. The process of claim 5 wherein the infra red blocking coating is applied as an ink comprising an infra red blocking material, polyvinylbutyral, and dimethyl formamide.

7. The process of claim 5 wherein the infra red blocking coating comprises an infra red blocking material selected from the group consisting of indium tin oxide (ITO), antimony tin oxide (ATO), lanthanum hexaboride, and iron oxides.

8. A process for preparing a polymeric film or sheet having at least one surface that is at least partially covered with a coating comprising infra red blocking particles, wherein the IR blocking coating comprises IR blocking particles dispersed in PVB, the process comprising the steps:

passing the IR blocking particles through a grinding apparatus to disperse the IR blocking particles and obtain an IR blocking ink; and

printing the ink onto the surface of the polymer film or sheet.

9. The process of claim 8, wherein the IR blocking particles are passed through the grinding apparatus with dimethyl formamide, polyvinylbutyral, or both dimethyl formamide and polyvinylbutyral.

10. The process of claim 8, wherein the IR blocking particles comprise an infra red blocking material selected from the group consisting of indium tin oxide (ITO), antimony tin oxide (ATO), lanthanum hexaboride, and iron oxides.

11. A laminate comprising a polymeric film or sheet wherein the film or sheet comprises at least one surface that is at least partially covered with an IR blocking coating comprising IR blocking particles and PVB.

12. The laminate of claim 11 wherein the IR blocking particles comprise an infra red blocking material selected from the group consisting of indium tin oxide (ITO), antimony tin oxide (ATO), lanthanum hexaboride, and iron oxides.

13. A laminate comprising at least two layers of a polymeric film or sheet, at least one of said two layers having at least one surface that is at least partially covered with an IR blocking coating comprising IR blocking particles and PVB.

14. The laminate of claim 13, wherein the IR blocking particles comprise an infra red blocking material selected from the group consisting of indium tin oxide (ITO), antimony tin oxide (ATO), lanthanum hexaboride, and iron oxides.