Polymer interlayers comprising antiblocking layers

• US 20060216501A1
• Filed: 03/24/2005
• Published: 09/28/2006
• Est. Priority Date: 03/24/2005
• Status: Abandoned Application

• Current Assignee: Solutia Incorporated (Eastman Chemical Company)
• Original Assignee: Solutia Incorporated (Eastman Chemical Company)
• Inventors: Lin, Chiah-chang Clifford, Yuan, Ping
• Application Number:
  US11/087,985
• Publication Number:
  US 20060216501A1
• Time in Patent Office: Days
• US Class Current: 428/339
• CPC Class Codes: B32B 17/1055 characterized by the resin layer, i.e. interlayer
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 17/10935 as a preformed layer, e.g. formed by extrusion
• CPC Class Codes: B32B 2250/02 2 layers
• CPC Class Codes: B32B 2250/03 3 layers
• CPC Class Codes: B32B 2250/24 All layers being polymeric
• CPC Class Codes: B32B 2250/246 All polymers belonging to those covered by groups B32B27/32 and B32B27/30
• CPC Class Codes: B32B 2264/0264 Polyamide particles
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2307/558 Impact strength, toughness
• CPC Class Codes: B32B 2307/746 Slipping, anti-blocking, low friction
• CPC Class Codes: B32B 2329/06 PVB, i.e. polyinylbutyral
• CPC Class Codes: B32B 2605/006 Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
• CPC Class Codes: B32B 2607/00 Walls, panels
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: B32B 27/20 using fillers, pigments, thixotroping agents
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/42 comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: C08K 5/20 : Carboxylic acid amides
• CPC Class Codes: C08L 2666/36 : Nitrogen-containing compounds
• CPC Class Codes: C08L 29/14 : 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: 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 428/269 : including synthetic resin or polymer layer or component
• CPC Class Codes: Y10T 428/31627 : Next to aldehyde or ketone condensation product
• CPC Class Codes: Y10T 428/3163 : Next to acetal of polymerized unsaturated alcohol [e.g., formal butyral, etc.]
• CPC Class Codes: Y10T 428/31909 : Next to second addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31942 : Of aldehyde or ketone condensation product
• CPC Class Codes: Y10T 428/31946 : Next to second aldehyde or ketone condensation product

Abstract

The present invention is in the field of polymer interlayers used in multiple layer glass panels, and specifically the present invention is in the field of antiblocking agents for polymer interlayers and methods of effectively incorporating such agents into interlayers.

Claims

1. An interlayer, comprising:

a polymer stack comprising a first polymer sheet, wherein said first polymer sheet is substantially free of antiblocking agent; and

,

a second polymer sheet disposed in contact with said polymer stack, wherein said second polymer sheet comprises an antiblocking agent and has a thickness of less than 0.4 millimeters.

2. The interlayer of claim 1, wherein said first polymer sheet and said second polymer sheet each comprise poly(vinyl butyral).

3. The interlayer of claim 2, wherein said second polymer sheet has a thickness of less than 0.3 millimeters.

4. The interlayer of claim 2, wherein said second polymer sheet has a thickness of less than 0.25 millimeters.

5. The interlayer of claim 2, wherein said antiblocking agent is a fatty acid amide with the general formula:

6. The interlayer of claim 2, wherein said polymer stack further comprises a polymer film disposed between said first polymer sheet and said second polymer sheet.

7. The interlayer of claim 2, further comprising a third polymer sheet disposed in contact with said polymer stack opposite said second polymer sheet, wherein said third polymer sheet comprises an antiblocking agent and has a thickness of less than 0.4 millimeters.

8. The interlayer of claim 2, wherein said first polymer sheet does not comprise an antiblocking agent.

9. An interlayer, comprising:

a polymer sheet, wherein said polymer sheet comprises an antiblocking region and a non antiblocking region, wherein said antiblocking region comprises an antiblocking agent and has a thickness of less than 0.4 millimeters, and said non antiblocking region is substantially free of antiblocking agents.

10. The interlayer of claim 9, wherein said antiblocking region and said non antiblocking region each comprise poly(vinyl butyral).

11. The interlayer of claim 10, wherein said antiblocking region has a thickness of less than 0.3 millimeters.

12. The interlayer of claim 10, wherein said non antiblocking region has a thickness of less than 0.125 millimeters.

13. The interlayer of claim 10, wherein said antiblocking agent is a fatty acid amide with the general formula:

14. The interlayer of claim 10, wherein said first antiblocking region does not comprise an antiblocking agent.

15. The interlayer of claim 10, wherein said antiblocking agent comprises N-oleyl palmitamide.

16. A method for making a polymer sheet, comprising:

coextruding a first melt and a second melt to form said polymer sheet, wherein said polymer sheet comprises an antiblocking region formed from said first melt and a non antiblocking region formed from said second melt, wherein said antiblocking region has a thickness of less than 0.4 millimeters, wherein said first melt comprises an antiblocking agent, and wherein said second melt is substantially free of antiblocking agent.

17. The method of claim 16, wherein said first melt and said second melt each comprise poly(vinyl butyral).

18. The method of claim 17, wherein said antiblocking region has a thickness of less than 0.3 millimeters.

19. The method of claim 17, wherein said antiblocking region has a thickness of less than 0.125 millimeters.

20. The method of claim 17, wherein said antiblocking agent is a fatty acid amide with the general formula:

21. The method of claim 17, wherein said second melt does not comprise an antiblocking agent.

22. The method of claim 17, wherein said antiblocking agent comprises N-oleyl palmitamide.

23. A method for making an interlayer, comprising:

providing a polymer stack, wherein said polymer stack comprises a first polymer sheet, wherein said first polymer sheet is substantially free of antiblocking agent;

disposing a second polymer sheet in contact with said polymer stack, wherein said second polymer sheet comprises an antiblocking agent and has a thickness of less than 0.4 millimeters; and

,

laminating said polymer stack and said second polymer sheet to form an interlayer.

24. The method of claim 23, wherein said first polymer sheet and said second polymer sheet each comprise poly(vinyl butyral).

25. The method of claim 24, wherein said second polymer sheet has a thickness of less than 0.3 millimeters.

26. The method of claim 24, wherein said second polymer sheet has a thickness of less than 0.2 millimeters.

27. The method of claim 24, wherein said antiblocking agent is a fatty acid amide with the general formula:

28. The method of claim 24, wherein said polymer stack further comprises a polymer film, which is disposed between said first polymer sheet and said second polymer sheet.

29. The method of claim 24, wherein said polymer stack further comprises a third polymer sheet, wherein said third polymer sheet comprises an antiblocking agent and has a thickness of less than 0.4 millimeters.

30. The method of claim 24, wherein said first polymer sheet does not comprise an antiblocking agent.