Intrusion resistant glass laminates

• US 7,867,605 B2
• Filed: 11/18/2004
• Issued: 01/11/2011
• Est. Priority Date: 09/28/2000
• Status: Expired due to Fees

• Current Assignee: Solutia Incorporated (Eastman Chemical Company)
• Original Assignee: Solutia Incorporated (Eastman Chemical Company)
• Inventors: Moran, James R, Lu, Jun
• Primary Examiner(s): Chen; Vivian
• Application Number:
  US10/991,565
• Publication Number:
  US 20050106372A1
• Time in Patent Office: 2,245 Days
• Field of Search: None
• 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 sheets of biaxially stretched polyethylene terephthalate bonded together with adhesive between two layers of plasticized polyvinyl butyral;

wherein the thickness of each biaxially stretched polyethylene terephthalate sheet is between 0.025 mm and 0.175 mm and the thickness of each plasticized polyvinyl butyral layer is between 0.1 mm and 2 mm; and

wherein the composite interlayer has less optical haze than a composite interlayer formed from a single sheet of polyethylene terephthalate having the same thickness as the two sheets of bonded biaxially stretched polyethylene terephthalate in combination.

2. The interlayer of claim 1, wherein each biaxially stretched polyethylene terephthalate sheet has a different thickness.

3. The interlayer of claim 1, wherein each biaxially stretched polyethylene terephthalate sheet has the same thickness.

4. The interlayer of claim 1, wherein the thickness of each biaxially stretched polyethylene terephthalate sheet is about 0.175 mm.

5. The interlayer of claim 4, wherein the thickness of said two sheets of biaxially stretched polyethylene terephthalate bonded together with adhesive is about 0.350 mm.

6. The interlayer of claim 1, wherein the thickness of each plasticized polyvinyl butyral layer is 0.375 mm to 1.5 mm.

7. The interlayer of claim 1, wherein each of said two sheets of biaxially stretched polyethylene terephthalate has a haze of less than 1%.

8. The interlayer of claim 1, wherein said sheets of biaxially stretched polyethylene terephthalate are bonded with a pressure sensitive acrylic resin.

9. The interlayer of claim 1, wherein one of said layers of plasticized polyvinyl butyral has a glass transition temperature of at least 35°

C.

10. A glass laminate, comprising, in order:

a first pane of glass;

a first polyvinyl butyral layer;

two sheets of biaxially stretched polyethylene terephthalate bonded together with adhesive;

a second polyvinyl butyral layer; and

, a second pane of glass;

wherein the thickness of each biaxially stretched polyethylene terephthalate sheet is between 0.025 mm and 0.175 mm and the thickness of each plasticized polyvinyl butyral layer is between 0.1 mm and 2 mm; and

wherein the composite interlayer has less optical haze than a composite interlayer formed from a single sheet of polyethylene terephthalate having the same thickness as the two sheets of bonded biaxially stretched polyethylene terephthalate in combination.

11. The laminate of claim 10, wherein each biaxially stretched polyethylene terephthalate sheet has a different thickness.

12. The laminate of claim 10, wherein each biaxially stretched polyethylene terephthalate sheet has the same thickness.

13. The laminate of claim 10, wherein the thickness of each biaxially stretched polyethylene terephthalate sheet is about 0.175 mm.

14. The laminate of claim 13, wherein the thickness of said two sheets of biaxially stretched polyethylene terephthalate bonded together with adhesive is about 0.350 mm.

15. The laminate of claim 10, wherein the thickness of each plasticized polyvinyl butyral layer is 0.375 mm to 1.5 mm.

16. The laminate of claim 10, wherein each of said two sheets of biaxially stretched polyethylene terephthalate has a haze of less than 1%.

17. The laminate of claim 10, wherein said sheets of biaxially stretched polyethylene terephthalate are bonded with a pressure sensitive acrylic resin.

18. The laminate of claim 10, wherein one of said layers of plasticized polyvinyl butyral has a glass transition temperature of at least 35°

C.

19. A composite laminate interlayer for a glass laminate, comprising two sheets of biaxially stretched polyethylene terephthalate bonded together with pressure sensitive acrylic resin between two layers of plasticized polyvinyl butyral;

wherein the thickness of each biaxially stretched polyethylene terephthalate sheet is between 0.025 mm and 0.25 mm, the thickness of each plasticized polyvinyl butyral layer is about 0.76 mm, the total thickness of the two sheets of biaxially stretched polyethylene terephthalate bonded together with pressure sensitive acrylic resin is 0.350 mm; and

wherein the composite interlayer has less optical haze than a composite interlayer formed from a single sheet of polyethylene terephthalate having the same thickness as the two sheets of bonded biaxially stretched polyethylene terephthalate in combination.