Defect resisting acoustic polymer interlayers

Patent metadata

Field	Value
Publication number	US-9833976-B2
Application number	US-201313781859-A
Country	US
Kind code	B2
Filing date	Mar 1, 2013
Priority date	Mar 9, 2012
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

This disclosure is related to the field of polymer interlayers for multiple layer glass panels and multiple layer glass panels having at least one polymer interlayer sheet. Specifically, this disclosure is related to the field of polymer interlayers comprising multiple thermoplastic layers which resist the formation of optical defects.

First claim

I claim:

1. A polymer interlayer comprising:
a first polymer layer comprising plasticized poly(vinyl butyral) having a molecular weight less than 140,000 Daltons;
a second polymer layer comprising plasticized poly(vinyl butyral) having a molecular weight greater than 140,000 Daltons;
a third polymer layer comprising plasticized poly(vinyl butyral) having a molecular weight less than 140,000 Daltons;
wherein said second polymer layer is disposed between said first polymer layer and said third polymer layer, thereby resulting in a polymer interlayer having two skin layers and a core layer, and wherein said second polymer layer comprises a higher level of total plasticizer than said first and said third polymer layers, and wherein said first polymer layer and said third polymer layer have a stress relaxation modulus, G′(t), measured at a temperature of 150° C. and a time of 100 seconds, in the range of from 0.10 to 100 Pascals.

2. The polymer interlayer of claim 1 wherein said poly(vinyl butyral) of said first polymer layer and/or said third polymer layer has a molecular weight less than 130,000 Daltons.

3. The polymer interlayer of claim 1 wherein said poly(vinyl butyral) of said first polymer layer and/or said third polymer layer has a molecular weight less than 120,000 Daltons.

4. The polymer interlayer of claim 1 wherein said poly(vinyl butyral) of said first polymer layer and/or said third polymer layer has a molecular weight less than 110,000 Daltons.

5. The polymer interlayer of claim 1 wherein said first polymer layer and/or said third polymer layer has a flow in the range of about 0.19 mm to about 0.37 mm as measured by DF135.

6. The polymer interlayer of claim 1 wherein said first polymer layer and/or said third polymer layer has an embossed post heat surface roughness, Rz, ranging from about 25 to about 55 microns.

7. The polymer interlayer of claim 1 wherein said first polymer layer and/or said third polymer layer has a flow in the range of about 0.19 mm to about 0.26 mm as measured by DF135.

8. The polymer interlayer of claim 1 where each of said first polymer layer and said third polymer layers comprises about 30 to about 60 phr total plasticizer.

9. The polymer interlayer of claim 1 where said first polymer layer and/or said third polymer layer comprises about 30 to about 50 phr total plasticizer.

10. The polymer interlayer of claim 1 wherein said poly (vinyl butyral) present in said second polymer layer comprises about 9 to about 18 weight percent residual hydroxyl groups calculated as PVOH.

11. The polymer interlayer of claim 1 , wherein the poly(vinyl butyral) in said first polymer layer and the poly(vinyl butyral) in said third polymer layer each have a residual hydroxyl content of at least 19 weight percent, calculated as PVOH, and wherein the total plasticizer content of each of said first polymer layer and said third polymer layer is not more than 38 phr.

Assignees

• Solutia Inc

Inventors

• Lu Jun

Classifications

• Y10T428/24942

  including components having same physical characteristic in differing degree · CPC title

• B32B27/08

  of synthetic resin · CPC title

• B32B17/10761

  containing vinyl acetal · CPC title

• B32B2329/04

  Polyvinylalcohol · CPC title

• Y10T428/31859

  Next to an aldehyde or ketone condensation product · CPC title