Polymer interlayers comprising a blend of two or more resins

Patent metadata

Field	Value
Publication number	US-9636894-B2
Application number	US-201514973547-A
Country	US
Kind code	B2
Filing date	Dec 17, 2015
Priority date	Jun 10, 2013
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

An interlayer comprised of a blend of thermoplastic resins and at least one high refractive index having improved acoustic and optical quality is disclosed. The use of a blend thermoplastic resins and a high refractive index plasticizer improves transparency and acoustic properties without sacrificing other characteristics of the interlayer.

First claim

The invention claimed is:

1. A polymer interlayer comprising a blend of resins, the blend comprising:
a first poly(vinyl butyral) resin having a first residual hydroxyl content;
a second poly(vinyl butyral) resin having a second residual hydroxyl content; and
a plasticizer;
wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 2.0 weight percent; and
wherein the refractive index of the blend is at least 1.480.

2. The polymer interlayer of claim 1 , wherein the first poly(vinyl butyral) resin and the second poly(vinyl butyral) resin are present in a ratio of between about 95:5 and 5:95.

3. The polymer interlayer of claim 1 , wherein the polymer interlayer has at least one glass transition temperature (T g ) greater than 25° C.

4. The polymer interlayer of claim 1 , wherein the plasticizer is a high refractive index plasticizer having a refractive index of at least 1.460.

5. The polymer interlayer of claim 1 , wherein the plasticizer is selected from dipropylene glycol dibenzoate, tripropylene glycol dibenzoate, polypropylene glycol dibenzoate, isodecyl benzoate, 2-ethylhexyl benzoate, diethylene glycol benzoate, butoxyethyl benzoate, butoxyethyoxyethyl benzoate, butoxyethoxyethoxyethyl 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, diethylene glycol di-o-toluate, triethylene glycol di-o-toluate, dipropylene glycol di-o-toluate, 1,2-octyl dibenzoate, tri-2-ethylhexyl trimellitate, di-2-ethylhexyl terephthalate, bis-phenol A bis(2-ethylhexaonate), di-(butoxyethyl) terephthalate, di-(butoxyethyoxyethyl) terephthalate, and mixtures thereof.

6. The polymer interlayer of claim 4 , further comprising a second plasticizer having a refractive index of less than about 1.450.

7. The polymer interlayer of claim 1 , wherein the polymer interlayer has a percent haze of less than 5.0%, as measured by ASTM D1003-61 (Re-approved 1977)-Procedure A using Illuminant C, at an observer angle of 2 degrees.

8. The polymer interlayer of claim 1 , wherein the polymer interlayer has at least two different glass transition temperatures (T g ) and the difference between the at least two different glass transition temperatures (T g ) is at least 5° C.

9. A polymer interlayer comprising a blend of resins, the blend comprising:
a first poly(vinyl butyral) resin having a first residual hydroxyl content;
a second poly(vinyl butyral) resin having a second residual hydroxyl content; and
a plasticizer;
wherein the difference between the first residual hydroxyl content and the second residual hydroxyl content is at least 2.0 weight percent; and
wherein the polymer interlayer has a percent haze of less than 5.0%, as measured by ASTM D1003-61 (Re-approved 1977)-Procedure A using Illuminant C, at an observer angle of 2 degrees.

10. The polymer interlayer of claim 9 , wherein the first poly(vinyl butyral) resin and the second poly(vinyl butyral) resin are present in a ratio of between about 95:5 and 5:95.

11. The polymer interlayer of claim 9 , wherein the polymer interlayer has at least one glass transition temperature (T g ) greater than 25° C.

12. The polymer interlayer of claim 9 , wherein the plasticizer is a high refractive index plasticizer having a refractive index of at least 1.460.

13. The polymer interlayer of claim 9 , wherein the refractive index of the blend is at least 1.480.

14. The polymer interlayer of claim 12 , further comprising a second plasticizer having a refractive index of less than about 1.450.

15. The polymer interlayer of claim 9 , wherein the polymer interlayer has at least two different glass transition temperatures (T g ) and the difference between at least two different glass transition temperatures (T g ) is at least 5° C.

16. A polymer interlayer comprising a blend of resins, the blend comprising:
a first poly(vinyl butyral) resin having a first residual hydroxyl content;
a second poly(vinyl butyral) resin having a second residual hydroxyl content; and
a plasticizer having a refractive index of at least 1.460;
wherein the blend has at least one glass transition temperature (T g ) greater than 25° C., and wherein the refractive index of the polymer interlayer is at least 1.480.

17. The polymer interlayer of claim 16 , wherein the refractive index of the polymer interlayer is at least 1.485.

18. The polymer interlayer of claim 16 , wherein the first poly(vinyl butyral) resin and the second poly(vinyl butyral) resin are present in a ratio of between 95:5 and 5:95.

19. The polymer interlayer of claim 16 , further comprising a second plasticizer, wherein the second plasticizer has a refractive index of less than about 1.450.

Assignees

• Solutia Inc

Inventors

• Lu Jun

Classifications

• B32B17/10761

  containing vinyl acetal · CPC title

• B32B27/30

  comprising vinyl {(co)polymers; comprising acrylic (co)polymers} · CPC title

• C08K5/13

  Phenols; Phenolates · CPC title

• B32B2605/08

  Cars · CPC title

• C08L29/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title