Polymer interlayers having improved optical properties

Patent metadata

Field	Value
Publication number	US-9254625-B2
Application number	US-201414299996-A
Country	US
Kind code	B2
Filing date	Jun 9, 2014
Priority date	Jun 10, 2013
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

An interlayer comprised of a thermoplastic resin, at least one high refractive index plasticizer and, optionally, a conventional plasticizer. The use of a thermoplastic resin, a high refractive index plasticizer, and, optionally, a conventional plasticizer reduces or minimizes the optical defects caused by different refractive indices without sacrificing other characteristics of the interlayer.

First claim

The invention claimed is:

1. A polymer interlayer comprising:
poly(vinyl butyral) resin; and
at least two different high refractive index plasticizers each having a refractive index of at least about 1.460;
wherein the interlayer comprises about 5 to about 120 parts of the high refractive index plasticizers per 100 parts poly(vinyl butyral) resin.

2. The polymer interlayer of claim 1 , wherein at least one of the high refractive index plasticizers has a refractive index of at least about 1.470.

3. The polymer interlayer of claim 1 , wherein at least one of the high refractive index plasticizers has a refractive index of at least about 1.480.

4. The polymer interlayer of claim 1 , wherein at least one of the high refractive index plasticizers has a refractive index of at least about 1.490.

5. The polymer interlayer of claim 1 , wherein the difference between the refractive index of the resin and the refractive index of at least one of the high refractive index plasticizers is less than about 0.075.

6. The polymer interlayer of claim 1 , wherein the difference between the refractive index of the resin and the refractive index of at least one of the high refractive index plasticizers is less than about 0.050.

7. The polymer interlayer of claim 1 , wherein the polymer interlayer further comprises at least one plasticizer having a refractive index of less than about 1.450.

8. The polymer interlayer of claim 1 , wherein at least one of the high refractive index plasticizers is selected from dipropylene glycol dibenzoate, tripropylene glycol dibenzoate, polypropylene glycol dibenzoate, isodecyl benzoate, 2-ethylhexyl benzoate, diethylene glycol benzoate, propylene glycol dibenzoate, 2,2,4-trimethyl-1,3-pentanediol dibenzoate, 2,2,4-trimethyl-1,3-pentanediol benzoate isobutyrate, 1,3-butanediol dibenzoate, 2,2,4-trimethyl-1,3-pentanediol dibenzoate, diethylene glycol di-o-toluoate, triethylene glycol di-o-toluoate, dipropylene glycol di-o-toluoate, 1,2-octyl dibenzoate, tri-2-ethylhexyl trimellitate, di-2-ethylhexyl terephthalate, bis-phenol A bis(2-ethylhexaonate), ethoxylated nonylphenol, and mixtures thereof.

9. The polymer interlayer of claim 8 , wherein at least one of the high refractive index plasticizers is selected from dipropylene glycol dibenzoate, 2,2,4-trimethyl-1,3-pentanediol dibenzoate, and tripropylene glycol dibenzoate.

10. The polymer interlayer of claim 1 , further comprising an additional plasticizer, wherein the additional plasticizer is triethylene glycol di-(2-ethylhexanoate).

11. The polymer interlayer of claim 1 , wherein the refractive index of the polymer interlayer is at least 1.480.

12. A polymer interlayer comprising:
poly(vinyl butyral) resin; and
a plasticizer mixture comprising:
at least one plasticizer having a refractive index of less than about 1.450; and
at least one high refractive index plasticizer having a refractive index of at least 1.460;

wherein the refractive index of the plasticizer mixture is at least 1.480; and
wherein the interlayer comprises about 5 to about 120 parts plasticizer mixture per 100 parts poly(vinyl butyral) resin.

13. The polymer interlayer of claim 12 , wherein the refractive index of the polymer interlayer is at least 1.480.

14. A polymer interlayer comprising:
poly(vinyl butyral) resin; and
at least two different high refractive index plasticizers each having a refractive index of at least about 1.460;
wherein the interlayer comprises about 5 to about 120 parts of the high refractive index plasticizers per 100 parts poly(vinyl butyral) resin, and wherein the refractive index of the polymer interlayer is at least 1.480, and
wherein the difference between the refractive index of the resin and the refractive index of at least one of the high refractive index plasticizers is less than about 0.075.

15. The polymer interlayer of claim 14 , wherein the difference between the refractive index of the resin and the refractive index of at least one of the high refractive index plasticizers is less than about 0.050.

16. The polymer interlayer of claim 14 , wherein the polymer interlayer further comprises at least one plasticizer having a refractive index of less than about 1.450.

17. The polymer interlayer of claim 12 , wherein the plasticizer having a refractive index of less than 1.450 is triethylene glycol di-(2-ethylhexanoate).

18. The polymer interlayer of claim 12 , wherein the difference between the refractive index of the resin and the refractive index of the plasticizer mixture is less than about 0.075.

Assignees

• Solutia Inc

Inventors

• Lu Jun
• Chen Wenjie

Classifications

• B32B2419/00

  Buildings or parts thereof · CPC title

• C08K5/0016

  Plasticisers · CPC title

• B32B2457/12

  Photovoltaic modules · CPC title

• B32B2307/558

  Impact strength, toughness · CPC title

• Y10T428/24983

  Hardness · CPC title