Cellulose ester multilayer interplayers

Patent metadata

Field	Value
Publication number	US-10300682-B2
Application number	US-201715453613-A
Country	US
Kind code	B2
Filing date	Mar 8, 2017
Priority date	Mar 11, 2016
Publication date	May 28, 2019
Grant date	May 28, 2019

Abstract

An interlayer structure having a cellulose ester layer for use in structural laminates is described herein. The cellulose ester layer provides rigidity and support to multilayer interlayers comprising an array of different layers. Due to the diverse properties of the cellulose ester layers, the present interlayers can be useful in producing structural laminates having high stiffness and which possess good optical clarity for a variety of applications, including outdoor structural applications.

First claim

What is claimed is:

1. A multilayer interlayer comprising:
(a) a non-cellulose ester layer comprising an ethylene vinyl acetate resin; and
(b) at least one cellulose ester layer comprising at least one cellulose ester having a hydroxyl content of at least 0.5 weight percent and not more than 30 weight percent based on the entire weight of the cellulose ester,
wherein said cellulose ester layer has a glass transitions temperature (“Tg”) of at least 50° C. and not more than 250° C.,
wherein an adhesive coating is interposed between the cellulose ester layer and the non-cellulose ester layer.

2. The multilayer interlayer of claim 1 , wherein the cellulose ester comprises at least two different acyl groups selected from acetate, propionate, butyrate, and other acyl groups.

3. The multilayer interlayer of claim 2 , wherein the cellulose ester comprises at least two of acetate, propionate and butyrate groups.

4. The multilayer interlayer of claim 1 , wherein said cellulose ester layer comprises a plasticizer.

5. The multilayer interlayer of claim 1 , wherein said ethylene vinyl acetate resin has a vinyl acetate content of 10 to 45 weight percent.

6. The multilayer interlayer of claim 1 , further comprising a second non-cellulose ester layer comprising an ethylene vinyl acetate resin, wherein said cellulose ester layer is at least partially interposed between said non-cellulose ester layer and said second non-cellulose ester layer.

7. The multilayer interlayer of claim 1 , further comprising a poly(vinyl acetal) layer comprising a poly(vinyl acetal) resin, wherein said non-cellulose ester layer is at least partially interposed between said cellulose ester layer and said poly(vinyl acetal) layer.

8. The multilayer interlayer of claim 7 , wherein said poly(vinyl acetal) resin comprises polyvinyl butyral.

9. The multilayer interlayer of claim 1 , wherein said cellulose ester layer exhibits a shear storage modulus that is greater than the shear storage modulus of said non-cellulose ester layer.

10. A multilayer interlayer comprising:
(a) a non-cellulose ester layer comprising an ethylene vinyl acetate resin; and
(b) at least one cellulose ester layer comprising at least one cellulose ester and at least 10 parts per hundred resin (phr) of plasticizer,
wherein said cellulose ester layer has a glass transitions temperature (“Tg”) of at least 50° C. and not more than 250° C.

11. The multilayer interlayer of claim 10 , wherein the cellulose ester comprises at least two different acyl groups selected from acetate, propionate, butyrate, and other acyl groups.

12. The multilayer interlayer of claim 11 , wherein the cellulose ester comprises at least two of acetate, propionate and butyrate groups.

13. The multilayer interlayer of claim 10 , wherein said ethylene vinyl acetate resin has a vinyl acetate content of 10 to 45 weight percent.

14. The multilayer interlayer of claim 10 , further comprising a second non-cellulose ester layer comprising an ethylene vinyl acetate resin, wherein said cellulose ester layer is at least partially interposed between said non-cellulose ester layer and said second non-cellulose ester layer.

15. The multilayer interlayer of claim 10 , further comprising a poly(vinyl acetal) layer comprising a poly(vinyl acetal) resin, wherein said non-cellulose ester layer is at least partially interposed between said cellulose ester layer and said poly(vinyl acetal) layer.

16. The multilayer interlayer of claim 10 , further comprising a second non-cellulose ester layer comprising an ethylene vinyl acetate resin and a second poly(vinyl acetal) layer comprising a poly(vinyl acetal) resin, wherein said second non-cellulose ester layer is at least partially interposed between said cellulose ester layer and said second poly(vinyl acetal) layer.

17. The multilayer interlayer of claim 15 , wherein said poly(vinyl acetal) resin of said second poly(vinyl acetal) layer comprises polyvinyl butyral.

18. A multilayer interlayer comprising:
(a) a non-cellulose ester layer comprising an ethylene vinyl acetate resin having a vinyl acetate content of from 10 to 45 weight percent; and
(b) at least one cellulose ester layer comprising acyl groups selected from acetate, propionate and butyrate groups and combinations thereof,
wherein said cellulose ester layer has a glass transition temperature (“Tg”) of at least 70° C. and not more than 250° C.

19. The multilayer interlayer of claim 18 , wherein said cellulose ester layer exhibits a shear storage modulus that is greater than the shear storage modulus of said non-cellulose ester layer.

20. The multilayer interlayer of claim 18 , wherein said cellulose ester layer has a glass transition temperature (“Tg”) of at least 80° C. and not more than 250° C.

Assignees

• Solutia Inc

Inventors

• Wade Bruce Edward
• Karagiannis Aristotelis
• Donelson Michael Eugene
• Tran Khanh Duc

Classifications

• B32B3/02

  characterised by features of form at particular places, e.g. in edge regions {(non-uniform thickness B32B3/263)} · CPC title

• B32B17/10761 Primary

  containing vinyl acetal · CPC title

• B32B27/40

  comprising polyurethanes · CPC title

• B32B2307/102

  Insulating · CPC title

• B32B23/16

  Modifying agents · CPC title