Polyvinyl acetal and cellulose ester multilayer interlayers

Patent metadata

Field	Value
Publication number	US-10293577-B2
Application number	US-201514958005-A
Country	US
Kind code	B2
Filing date	Dec 3, 2015
Priority date	Dec 8, 2014
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

A multilayer interlayer structure having a first and second polyvinyl acetal (poly(vinyl acetal)) layer and a cellulose ester layer having a thickness of at least 10 mils disposed between the first and second poly(vinyl acetal) layers. The cellulose ester layer can have a higher storage modulus and/or higher Tg than at least one of the poly(vinyl acetal) layers. The interlayer structure is useful to make glass panels having high stiffness and which possess good optical clarity for a variety of applications, including outdoor structural applications.

First claim

The invention claimed is:

1. A multilayer interlayer comprising:
(A) a first polyvinyl acetal (“poly(vinyl acetal)”) layer comprising poly(vinyl acetal) resin; and
(B) one or more cellulose ester (“CE”) layers comprising cellulose esters; and
(C) a second poly(vinyl acetal) layer comprising poly(vinyl acetal) resin; wherein at least one CE layer is disposed between the first and second poly(vinyl acetal) layers”); wherein said poly(vinyl acetal) comprises a polyvinyl butyral resin having a residual OH content ranging from 6-35 wt % PVOH based on the weight of the polyvinyl butyral resin; wherein the Tg of the first and second poly(vinyl acetal) layers is at least 30° C. less than the Tg of the at least one CE layer.

2. The multilayer interlayer of claim 1 , wherein at least one CE layer is in direct contact with the first and second poly(vinyl acetal) layers.

3. The multilayer interlayer of claim 1 , wherein the poly(vinyl acetal) layer comprises a polyvinyl butyral resin.

4. The multilayer interlayer of claim 1 , further comprising a polymer film.

5. The multilayer interlayer of claim 1 , wherein at least one of the poly(vinyl acetal) layers comprises a polyvinyl butyral resin having a residual OH content ranging from 6-35 wt % PVOH based on the weight of the polyvinyl butyral resin.

6. The multilayer interlayer of claim 1 , wherein the at least one of the poly(vinyl acetal) layers comprises a polyvinyl butyral resin having an OH content of less than 35 wt. % calculated at PVOH, an ester content of 0 to 20 wt. %, and the balance being acetal groups.

7. The multilayer interlayer of claim 1 , wherein the Tg of the first and second poly(vinyl acetal) layers is less than 65° C.

8. The multilayer interlayer of claim 1 , wherein the Tg of the first and second poly(vinyl acetal) layers is at least 30° C. less than the Tg of the at least one CE layer.

9. The multilayer interlayer of claim 1 , wherein CE has an average total DS/AGU of 1.5 to 3.0.

10. The multilayer interlayer of claim 1 , wherein the CE layer has a Tg ranging from 55−200° C.

11. The multilayer interlayer of claim 1 , wherein at least one poly(vinyl acetal) layer(s) contains a plasticizer in an amount ranging from 5 to 80 phr.

12. The multilayer interlayer of claim 1 , wherein CE layer contains a plasticizer in an amount ranging from 2 to 80 wt. %, based on the weight of the CE layer.

13. A glass panel comprising a multilayer interlayer disposed between two glass substrates, said multilayer interlayer comprising:
(A) a first polyvinyl acetal (“poly(vinyl acetal)”) layer comprising poly(vinyl acetal) resin; and
(B) one or more cellulose ester (“CE”) layers comprising cellulose esters; and
(C) a second poly(vinyl acetal) layer comprising poly(vinyl acetal) resin; wherein at least one CE layer is disposed between the first and second poly(vinyl acetal) layers, and the glass panel has a haze value of 5% or less; wherein said poly(vinyl acetal) comprises a polyvinyl butyral resin having a residual OH content ranging from 6-35 wt % PVOH based on the weight of the polyvinyl butyral resin.

14. The glass panel of claim 13 , wherein the haze value is 3% or less.

15. The glass panel of claim 13 , wherein the glass panel is contained in or comprises stairs, an outdoor platform, pavement or sidewalk, skylight, structural supporting beam, a window on a land motor vehicle, a window on an airplane, a window on a boat, single side balcony laminates, canopies, handrails, building envelopes, bullet proof glass, or bomb blast resistant glass.

16. A multilayer interlayer comprising:
(A) a first polyvinyl acetal (“poly(vinyl acetal)”) layer comprising poly(vinyl acetal) resin; and
(B) one or more cellulose ester (“CE”) layers comprising cellulose esters; and
(C) a second poly(vinyl acetal) layer comprising poly(vinyl acetal) resin;
wherein the Tg of the first and second poly(vinyl acetal) layers is at least 30° C. less than the Tg of the at least one CE layer; wherein said poly(vinyl acetal) comprises a polyvinyl butyral resin having a residual OH content ranging from 6-35 wt % PVOH based on the weight of the polyvinyl butyral resin.

17. The multilayer interlayer of claim 16 , wherein the Tg of the first and second poly(vinyl acetal) layers is less than 65° C.

18. The multilayer interlayer of claim 16 , wherein at least one poly(vinyl acetal) layer(s) contains a plasticizer in an amount ranging from 5 to 80 phr, and the CE layer contains plasticizer in an amount ranging from 2 to 80 wt. %, based on the weight of the CE layer.

Assignees

• Solutia Inc

Inventors

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

Classifications

• B32B27/22

  using plasticisers · CPC title

• B32B2307/412

  Transparent · CPC title

• B32B27/06

  as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)} · CPC title

• B32B2605/006

  Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings · CPC title

• B32B2607/02

  Wall papers, wall coverings · CPC title