Glazing element and laminate for use in the same

• US 7,238,401 B1
• Filed: 06/09/2000
• Issued: 07/03/2007
• Est. Priority Date: 06/09/2000
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Dietz, Peter T.
• Primary Examiner(s): Vo; Hai
• Application Number:
  US09/591,584
• Time in Patent Office: 2,580 Days
• Field of Search: 428/343, 428/352, 428/354, 428/355, 428/345, 428/216, 428/337, 428/421, 428/40.1, 428/425.6
• US Class Current: 428/41.7
• CPC Class Codes: B32B 17/10009 characterized by the number, the constitution or treatment of glass sheets
• CPC Class Codes: B32B 17/1033 Laminated safety glass or glazing containing temporary protective coatings or layers
• CPC Class Codes: B32B 17/10779 containing polyester
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: C03C 17/324 Polyesters
• CPC Class Codes: C03C 17/3405 with at least two coatings of organic materials C03C17/36, C03C17/42 take precedence
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/1452 Polymer derived only from ethylenically unsaturated monomer
• CPC Class Codes: Y10T 428/1471 Protective layer
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]

Abstract

A multi-layer optically clear laminate suited for attachment to window glass to provide a glazing element which has reduced spall and lacerative consequences on fracture impact of the window glass is provided by the invention. The laminate is comprised of at least two films of nonadhesive polymeric material directly adhered together by pressure sensitive adhesive and includes an exposed surface covered with a hard coat composition and an opposite surface covered with an ambient temperature attachable pressure sensitive adhesive. A glazing element comprised of the laminate attached to glass is also provided.

Claims

1. A laminate attached to window glass suitable for use in a vehicular or architectural glazing element which has reduced spall and lacerative consequences on impact fracture of the window glass;

said laminate comprising;

(a) a first lamina comprised of visible light transmissive flexible nonadhesive polymeric material having a first major surface and an opposite second major surface;

(b) a scratch-resistant layer over said first major surface to provide an exposed surface to the laminate;

(c) at least one additional lamina comprised of visible light transmissive flexible nonadhesive polymeric material;

(d) a sufficient number of layers of in situ visible light transmissive pressure sensitive adhesive layers to bond said laminae together with the scratch-resistant layer exposed; and

(e) a layer of in situ visible light transmissive ambient temperature attachable pressure sensitive adhesive to bond said laminate to window glass, wherein the total thickness of the laminate exceeds about 5 mils and the laminate exhibits a light transmittance,

wherein said laminate exhibits a light transmittance of at least about 75%.

2. The laminate attached to window glass of claim 1 wherein each of said laminae has a thickness no greater than about 5 mils (0.13 mm).

3. The laminate attached to window glass of claim 1 wherein each of said laminae is comprised of biaxially oriented polyester film.

4. The laminate attached to window glass of claim 1 wherein said pressure sensitive adhesive is comprised of acrylic based copolymer.

5. The laminate attached to window glass of claim 1 further including a third lamina comprised of visible light transmissive flexible non-adhesive polymeric material.

6. The laminate attached to window glass of claim 1 wherein the scratch-resistant layer comprises a cured ceramer.

7. The laminate attached to window glass of claim 1 wherein said window glass comprises tempered or laminated window glass, said laminate and window glass define a glazing element which passes the following ANSI Z-26 tests:

5.04—

Two Hour Boiling Water;

5.13—

Thirty Foot (9.14 m) Ball Drop;

5.17—

Resistance to Abrasion;

5.19—

Chemical Resistance; and

5.23—

Flammability.

8. The laminate attached to window glass of claim 1 wherein said pressure sensitive adhesive layers are comprised of pressure sensitive adhesive having a shear storage modulus measured at 22°

C. in the range of about 0.20 Mpa to about 0.50 Mpa.

9. The laminate attached to window glass of claim 1, wherein each of said visible light transmissive pressure sensitive adhesive layers comprises an adhesive sufficient to maintain the laminate together through the ANSI Z-26 test:

5.04—

Two Hour Boiling Water.

10. The laminate attached to window glass of claim 1, wherein said attachable pressure sensitive adhesive layer comprises an adhesive including a cross linker solution.

11. The laminate attached to window glass of claim 1, wherein the laminate attached to the window glass has a percent haze less than or equal to about 2.0%.

12. The laminate attached to window glass of claim 1, wherein the laminate attached to the window glass has a percent visible light transmission greater than or equal to about 88.6%.

13. The laminate attached to window glass of claim 1, wherein the laminate attached to the window glass provides a glazing element which also passes each of the following ANSI Z-26 tests:

5.13—

Thirty Foot Ball (9.14 m) Drop;

5.17—

Resistance to Abrasion;

5.19—

Chemical Resistance; and

5.23—

Flammability.

14. The laminate attached to window glass of claim 1, wherein each of said visible light transmissive pressure sensitive adhesive layers comprises an adhesive sufficient to maintain the laminae together through the ANSI Z-26 test:

5.04—

Two Hour Boiling Water.

15. The laminate attached to window glass of claim 1, wherein said scratch-resistant layer comprises a scratch-resistant hard coating.

16. The laminate attached to window glass of claim 1, wherein said pressure sensitive adhesive layers directly bond said laminae together.

17. A laminate attached to window glass as set forth in claim 1, wherein said first lamina is comprised of optically clear flexible nonadhesive polymeric material, said at least one additional lamina is comprised of optically clear flexible nonadhesive polymeric material, said sufficient number of layers of in situ adhesive layers comprise optically clear pressure sensitive adhesive layers, and said layer of in situ ambient temperature attachable pressure sensitive adhesive comprises an optically clear ambient temperature attachable pressure sensitive adhesive.

18. A vehicular or architectural glazing element comprising the laminate attached to window glass of claim 1.

19. A vehicular or architectural glazing element which has reduced spall and lacerative consequences on impact fracture, said glazing element comprising:

(a) a laminate comprising a first laminae comprised of visible light transmissive flexible polymeric material having a first major surface and an opposite second major surface;

a scratch-resistant layer over said first major surface;

at least one additional lamina comprised of visible light transmissive flexible nonadhesive polymeric material;

a sufficient number of layers of in situ visible light transmissive pressure sensitive adhesive layers to bond said laminae together with the scratch-resistant layer exposed;

a layer of in situ visible light transmissive ambient temperature attachable pressure sensitive adhesive to bond said laminate to window glass;

wherein the total thickness of the laminate exceeds about 5 mils and the laminate exhibits a light transmittance; and

(b) window glass;

wherein said laminate exhibits a light transmittance of at least about 75%.

20. The glazing element of claim 19 wherein said window glass is tempered.

21. The glazing element of claim 19 wherein said pressure sensitive adhesive layers are comprised of pressure sensitive adhesive having a shear storage modulus measured at 22°

C. in the range of about 0.20 MPa to about 0.50 MPa.

22. The glazing element of claim 19, wherein it passes the ANSI Z-6 test:

5.04—

Two Hour Boiling Water.

23. The glazing element of claim 22, wherein it also passes at least one of the following ANSI Z-26 tests:

5.13—

Thirty Foot Ball (9.14 m) Drop;

5.17—

Resistance to Abrasion;

5.19—

Chemical Resistance; and

5.23—

Flammability.

24. The glazing element of claim 22, wherein it also passes each of the following ANSI Z-26 tests:

5.13—

Thirty Foot Ball (9.14 m) Drop;

5.17—

Resistance to Abrasion;

5.19—

Chemical Resistance; and

5.23—

Flammability.

25. The glazing element of claim 19, wherein it has a percent haze less than or equal to about 2.0%.

26. The glazing element of claim 19, wherein it has a percent visible light transmission greater than or equal to about 88.6%.

27. The glazing element of claim 19, wherein said pressure sensitive adhesive layers directly bond said laminae together.

28. The glazing element of claim 19, wherein said attachable pressure sensitive adhesive comprises a cross linker solution.

29. A glazing element as set forth in claim 19, wherein said first lamina is comprised of optically clear flexible polymeric material, said at least one additional lamina is comprised of optically clear flexible polymeric material, said sufficient number of layers of in situ adhesive layers comprise optically clear pressure sensitive adhesive layers, and said layer of in situ ambient temperature attachable pressure sensitive adhesive comprises an optically clear ambient temperature attachable pressure sensitive adhesive.

30. A laminate attached to window glass suitable for use in a vehicular or architectural glazing element comprising the following components adhered together in the following order:

(a) a scratch-resistant layer comprised of cured ceramer;

(b) a first biaxially oriented polyester film having a thickness of not more than 5 mils (0.13 mm);

(c) a first pressure sensitive adhesive layer;

(d) a second biaxially oriented polyester film having a thickness of not more than 5 mils (0.13 mm);

(e) a second pressure sensitive adhesive layer;

(f) a third biaxially oriented polyester film having a thickness of not more than 5 mils (0.13 mm); and

(g) a third ambient-temperature-attachable pressure sensitive adhesive layer;

wherein said pressure sensitive adhesive layers are comprised of pressure sensitive adhesive having a shear storage modulus measured at 22°

C. in the range of about 0.20 MPa to 0.50 MPa,

wherein said laminate comprises an optically clear laminate.

31. A vehicular or architectural glazing element comprising the laminate attached to window glass of claim 30.

32. A light transmissive laminate suited for attachment to window glass to provide a glazing element which has reduced spall and lacerative consequences on impact fracture of the window glass;

said laminate comprising;

(a) a first lamina comprised of visible light transmissive flexible nonadhesive polymeric material having a first major surface and an opposite second major surface;

(b) a scratch-resistant layer over said first major surface to provide an exposed surface to the laminate;

(c) at least one additional lamina comprised of visible light transmissive flexible nonadhesive polymeric material;

(d) a sufficient number of layers of in situ visible light transmissive pressure sensitive adhesive layers to bond said laminae together with the scratch-resistant layer exposed;

(e) a layer of in situ visible light transmissive ambient temperature attachable pressure sensitive adhesive to bond said laminate to window glass; and

wherein the total thickness of the laminate exceeds about 5 mils, the laminate exhibits a light transmittance of at least about 75% and said pressure sensitive adhesive layers are comprised of pressure sensitive adhesive having a shear storage modulus measured at 22°

C. in the range of about 0.20 Mpa to about 0.50 MPa.

33. The laminate of claim 32, wherein once attached to window glass has a percent haze less than or equal to about 2.0%.

34. The laminate of claim 32, wherein it exhibits a light transmittance of at least about 85%.

35. The laminate of claim 32, wherein said attachable pressure sensitive adhesive layer comprises an adhesive including a cross linker solution.

36. The laminate of claim 32, wherein said pressure sensitive adhesive layers directly bond said laminae together.

37. A light transmissive laminate as set forth in claim 32, wherein said first lamina is comprised of optically clear flexible nonadhesive polymeric material, said at least one additional lamina is comprised of optically clear flexible nonadhesive polymeric material, said sufficient number of layers of in situ adhesive layers comprise optically clear pressure sensitive adhesive layers, and said layer of in situ ambient temperature attachable pressure sensitive adhesive comprises an optically clear ambient temperature attachable pressure sensitive adhesive.