Intrusion resistant glass laminates

• US 20050106372A1
• Filed: 11/18/2004
• Published: 05/19/2005
• Est. Priority Date: 09/28/2000
• Status: Active Grant

• Current Assignee: Solutia Incorporated (Eastman Chemical Company)
• Original Assignee: Solutia Incorporated (Eastman Chemical Company)
• Inventors: Lu, Jun, Moran, James R.
• Granted Patent: US 7,867,605 B2
• Time in Patent Office: Days
• US Class Current: 428/215
• CPC Class Codes: B32B 17/10005 laminated safety glass or glazing
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10743 containing acrylate (co)polymers or salts thereof
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/2495 Thickness [relative or absolute]
• CPC Class Codes: Y10T 428/24967 Absolute thicknesses specified
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/266 of base or substrate
• CPC Class Codes: Y10T 428/269 including synthetic resin or polymer layer or component
• CPC Class Codes: Y10T 428/31616 Next to polyester [e.g., alkyd]
• CPC Class Codes: Y10T 428/3163 Next to acetal of polymerized unsaturated alcohol [e.g., formal butyral, etc.]
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31797 Next to addition polymer from unsaturated monomers

Abstract

Composite laminate interlayers for adhering a glass laminate comprising two sheets of polyethylene terephthalate (PET) between layers of plasticized polyvinyl butyral (PVB) adhesive layers, wherein the two PET layers provide increased stiffness for the laminate without sacrificing the optical clarity of the laminate.

Claims

1. A composite laminate interlayer for a glass laminate comprising:

two or more separate sheets of optical-grade polyethylene terephthalate bonded together between two layers of plasticized polyvinyl butyral, wherein the two or more sheets of optical-grade polyethylene terephthalate are bonded together with an adhesive layer that does not contribute substantially to the sound attenuating performance of a glass laminate produced therefrom.

2. The interlayer of claim 1 wherein the thickness of each polyethylene terephthalate layer is between about 0.025 mm (1 mil) and about 0.25 mm (10 mil) and the thickness of each plasticized polyvinyl butyral layer is between about 0.1 mm (4 mil) and about 2 mm (80 mil).

3. The interlayer of claim 2 wherein each polyethylene terephthalate layer has a different thickness.

4. The interlayer of claim 2 wherein each polyethylene terephthalate layer has about the same thickness.

5. The interlayer of claim 2 wherein the thickness of each polyethylene terephthalate layer is about 0.175 mm (7 mil).

6. The interlayer of claim 2 wherein the thickness of each plasticized polyvinyl butyral layer is between about 0.375 mm (15 mil) and about 1.5 mm (60 mil).

7. The interlayer of claim 6 wherein the thickness of each plasticized polyvinyl butyral layer is about 0.76 mm (30.4 mil).

8. The interlayer of claim 1 wherein the each layer of polyethylene terephthalate has a haze of less than 1%.

9. The interlayer of claim 1 further comprising an additional functional layer.

10. The interlayer of claim 9 wherein the functional layer is a sound attenuating elastomer layer or a radiation blocking layer.

11. The interlayer of claim 1, wherein the adhesive layer is a pressure sensitive acrylic resin.

12. The interlayer of claim 1, wherein the adhesive layer is a layer of plasticized polyvinyl butyral.

13. The interlayer of claim 1, wherein at least one layer of plasticized polyvinyl butyral has a Tg of at least 35°

C.

14. A composite laminate interlayer for a glass laminate consisting essentially of two sheets of optical-grade polyethylene terephthalate between layers of plasticized polyvinyl butyral;

the two sheets of optical-grade polyethylene terephthalate being bonded together with an adhesive layer, wherein the acoustic properties of the composite laminate interlayer would be substantially the same if the two or more sheets of optical-grade polyethylene terephthalate were not bonded together with the adhesive layer.

15. The interlayer of claim 14 wherein the thickness of each polyethylene terephthalate layer is between about 0.025 mm (1 mil) and about 0.25 mm (10 mil) and the thickness of each plasticized polyvinyl butyral layer is between about 0.1 mm (4 mil) and about 2 mm (80 mil).

16. The interlayer of claim 14, wherein the two sheets of bonded optical-grade polyethylene terephthalate are bonded with a pressure sensitive acrylic resin.

17. The interlayer of claim 14, wherein the two sheets of bonded optical-grade polyethylene terephthalate are bonded with a layer of plasticized polyvinyl butyral.

18. The interlayer of claim 14, wherein at least one layer of plasticized polyvinyl butyral has a Tg of at least 35°

C.

19. A glass laminate comprising in order:

a) a first glass sheet,

b) a first layer of plasticized polyvinyl butyral,

c) a first layer of optical grade polyethylene terephthalate,

d) an adhesive layer;

e) a second layer of optical grade polyethylene terephthalate,

f) a second layer of plasticized polyvinyl butyral, and

g) a second glass sheet;

wherein the adhesive layer does not contribute substantially to the sound attenuating performance of the glass laminate.

20. The glass laminate of claim 19 wherein the thickness of the first and second glass sheets is between about 1 mm and about 10 mm, the thickness of each polyethylene terephthalate layer is between about 0.025 mm (1 mil) and about 0.175 mm (7 mil), and the thickness of each plasticized polyvinyl butyral layer is between about 0.1 mm (4 mil) and about 2 mm (80 mil).

21. The glass laminate of claim 20 wherein the thickness of the first and second glass sheets is between about 1 mm and about 10 mm, the thickness of each polyethylene terephthalate layer is about 0.175 mm (7 mil), and the thickness of each plasticized polyvinyl butyral layer is between about 0.375 mm (15 mil) and about 1.5 mm (60 mil).

22. The glass laminate of claim 19 wherein each layer of polyethylene terephthalate has a haze of less than 1%.

23. The glass laminate of claim 19 further comprising an additional functional layer.

24. The glass laminate of claim 23 wherein the functional layer is a sound attenuating elastomer layer or a radiation blocking layer.

25. The glass laminate of claim 19, wherein the adhesive layer is a pressure sensitive acrylic resin.

26. The glass laminate of claim 19, wherein the adhesive layer is a layer of plasticized polyvinyl butyral.

27. The glass laminate of claim 19, wherein at least one layer of plasticized polyvinyl butyral has a Tg of at least 35°

C.

28. A glass laminate consisting essentially of in order:

a) a first glass sheet,

b) a first layer of plasticized polyvinyl butyral,

c) a first layer of optical grade polyethylene terephthalate bonded to a second layer of optical grade polyethylene terephthalate with an adhesive layer,

d) a second layer of plasticized polyvinyl butyral, and

e) a second glass sheet,

wherein at least one layer of plasticized polyvinyl butyral has a Tg of at least 35°

C. and the adhesive does not contribute substantially to the sound attenuating performance of the glass laminate.

29. The glass laminate of claim 28 wherein the thickness of the first and second glass sheets is between about 1 mm and about 20 mm, the thickness of each polyethylene terephthalate layer is between about 0.025 mm (1 mil) and about 0.175 mm (7 mil), and the thickness of each plasticized polyvinyl butyral layer is between about 0.1 mm (4 mil) and about 2 mm (80 mil).

30. The glass laminate of claim 29 wherein the thickness of the first and second glass sheets is between about 1 mm and about 10 mm, the thickness of each polyethylene terephthalate layer is about 0.175 mm (7 mil), and the thickness of each plasticized polyvinyl butyral layer is between about 0.375 mm (16 mil) and about 1.5 mm (60 mil).

31. The glass laminate of claim 28 wherein each layer of polyethylene terephthalate has a haze of less than 1%.

32. The glass laminate of claim 28, wherein the adhesive layer is a pressure sensitive acrylic resin.

33. The glass laminate of claim 28, wherein the adhesive layer is a layer of plasticized polyvinyl butyral.