Methods of making polymer interlayers comprising poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester

• US 20070000593A1
• Filed: 06/30/2005
• Published: 01/04/2007
• Est. Priority Date: 06/30/2005
• Status: Active Grant

• Current Assignee: Solutia Incorporated (Eastman Chemical Company)
• Original Assignee: Solutia Incorporated (Eastman Chemical Company)
• Inventors: Karagiannis, Aristotelis, Szydlowski, Witold, Chen, Wenjie
• Granted Patent: US 7,686,906 B2
• Time in Patent Office: Days
• US Class Current: 156/99
• CPC Class Codes: B29C 48/08 flexible, e.g. films
• CPC Class Codes: B29C 48/18 the components being layers
• CPC Class Codes: B32B 17/10018 comprising only one glass sheet
• CPC Class Codes: B32B 17/1077 containing polyurethane
• CPC Class Codes: B32B 17/10779 containing polyester
• CPC Class Codes: B32B 17/10788 containing ethylene vinylacetate
• CPC Class Codes: B32B 2250/03 3 layers
• CPC Class Codes: B32B 2307/536 Hardness
• CPC Class Codes: B32B 2307/558 Impact strength, toughness
• CPC Class Codes: B32B 2307/702 Amorphous
• CPC Class Codes: B32B 2605/006 Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
• CPC Class Codes: B32B 27/08 of synthetic resin
• 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

Abstract

The present invention is in the field of polymer interlayers used in multiple layer glass panels having one or more glass layers, and specifically the present invention is in the field of polymer interlayers comprising a layer of poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester (PETG).

Claims

1. A method of manufacturing a multiple layer glazing panel interlayer, comprising:

forming a first melt comprising poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester;

forming a second melt comprising polyurethane or poly(ethylene-co-vinyl acetate); and

,

coextruding said first melt and said second melt to form said interlayer.

2. The method of claim 1, wherein said second melt comprises poly(ethylene-co-vinyl acetate).

3. The method of claim 2, wherein said poly(ethylene-co-vinyl acetate) is extruded at a temperature of 90°

C. to 200°

C. and said poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester is extruded at a temperature of 200°

C. to 290°

C.

4. The method of claim 2, wherein said first melt is used to form a single layer and said second melt is used to form a single layer, thereby resulting in said interlayer having two layers.

5. The method of claim 2, wherein said first melt is used to form a single layer and said second melt is used to form two layers, thereby resulting in said interlayer having a single layer of polymer comprising poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester disposed between two layers of polymer comprising poly(ethylene-co-vinyl acetate).

6. The method of claim 1, wherein said second melt comprises polyurethane.

7. The method of claim 6, wherein said polyurethane is extruded at a temperature of 150°

C. to 225°

C. and said poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester is extruded at a temperature of 200°

C. to 290°

C.

8. The method of claim 6, wherein said first melt is used to form a single layer and said second melt is used to form a single layer, thereby resulting in said interlayer having two layers.

9. The method of claim 6, wherein said first melt is used to form a single layer and said second melt is used to form two layers, thereby resulting in said interlayer having a single layer of polymer comprising poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester disposed between two layers of polymer comprising polyurethane.

10. The method of claim 1, wherein said first polymer melt comprises poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester having at least 10% poly(ethylene terephthalate) component by weight.

11. The method of claim 1, wherein said first polymer melt comprises poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester having at least 40% poly(ethylene terephthalate) component by weight.

12. A method of manufacturing a multiple layer glazing panel, comprising:

forming a first melt comprising poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester;

forming a second melt comprising polyurethane or poly(ethylene-co-vinyl acetate);

coextruding said first melt and said second melt to form an interlayer; and

,

laminating said interlayer with at least one layer of glass to form said glazing panel.

13. The method of claim 12, wherein said second melt comprises poly(ethylene-co-vinyl acetate).

14. The method of claim 13, wherein said poly(ethylene-co-vinyl acetate) is extruded at a temperature of 90°

C. to 200°

C. and said poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester is extruded at a temperature of 200°

C. to 290°

C.

15. The method of claim 13, wherein said first melt is used to form a single layer and said second melt is used to form a single layer, thereby resulting in said interlayer having two layers.

16. The method of claim 13, wherein said first melt is used to form a single layer and said second melt is used to form two layers, thereby resulting in said interlayer having a single layer of polymer comprising poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester disposed between two layers of polymer comprising poly(ethylene-co-vinyl acetate).

17. The method of claim 12, wherein said second melt comprises polyurethane.

18. The method of claim 17, wherein said polyurethane is extruded at a temperature of 150°

C. to 225°

C. and said poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester is extruded at a temperature of 200°

C. to 290°

C.

19. The method of claim 17, wherein said first melt is used to form a single layer and said second melt is used to form a single layer, thereby resulting in said interlayer having two layers.

20. The method of claim 17, wherein said first melt is used to form a single layer and said second melt is used to form two layers, thereby resulting in said interlayer having a single layer of polymer comprising poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester disposed between two layers of polymer comprising polyurethane.

21. The method of claim 12, wherein said first polymer melt comprises poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester having at least 10% poly(ethylene terephthalate) component by weight.

22. The method of claim 12, wherein said first polymer melt comprises poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester having at least 40% poly(ethylene terephthalate) component by weight.

23. The method of claim 12, wherein said interlayer is laminated between two layers of glass to form said glazing panel.

24. A multiple layer glazing panel interlayer produced by the process comprising:

forming a first melt comprising poly(cyclohexanedimethylene terephthalate-co-ethylene terephthalate) copolyester;

forming a second melt comprising polyurethane or poly(ethylene-co-vinyl acetate); and

,

coextruding said first melt and said second melt to form said interlayer.