Textured interlayers

Patent metadata

Field	Value
Publication number	US-12459241-B2
Application number	US-202218550050-A
Country	US
Kind code	B2
Filing date	Mar 8, 2022
Priority date	Mar 12, 2021
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

The invention provides a PVB interlayer sheet having a surface topography on at least one surface which is characterized as having a relatively low profile and a controlled, collapsible surface roughness profile (upon exposure to heat) having a population of significantly more surface peaks than negative peaks (valleys) in certain embodiments and slightly more distant peak spacing than is generally found in embossed PVB interlayers. The PVB interlayer sheets of the invention thus provide very good initial contact and tack of PVB to a glass surface, while leaving very little residual air behind after a first nip in a traditional glass lamination process when compared to other surface designs. The PVB interlayer sheets of the invention also exhibit a wide deairing window which affords greater tolerance of temperature and process variations.

First claim

The invention claimed is:

1 . A poly(vinyl acetal) polymeric sheet having at least one textured outer surface, wherein the textured surface is characterized by:
a. an Mr2/Mr1 ratio of 3 to 10, as determined by ISO 13565-2; b. a surface roughness, Rz, of 20 μm to 60 μm; c. an Sdr value of greater than equal to 0.05 and less than 0.414, as determined by ISO 25178; d. an Rsm value of 230 μm to 600 μm; and e. a surface retention value (Rz2/Rz1) at 100° C. of less than 85%; and wherein the Str value is greater than 0.4 and less than 0.7.

2 . The sheet of claim 1 , wherein the surface roughness, Rz, is 25 μm to 50 μm.

3 . The sheet of claim 1 , wherein the Mr2/Mr1 ratio is 4 to 10.

4 . The sheet of claim 1 , wherein the Mr2/Mr1 ratio is 4 to 9.

5 . The sheet of claim 1 , wherein the Mr2/Mr1 ratio is 5 to 9.

6 . The sheet of claim 1 , wherein the Sdr value is greater than 0.05 but less than 0.25, as determined by ISO 25178.

7 . The sheet of claim 6 , wherein the Sdr value is 0.1 to 0.2, as determined by ISO 25178.

8 . The sheet of claim 1 , wherein the Rsm value is 350 μm to 450 μm.

9 . The sheet of claim 1 , wherein the polymeric sheet comprises a poly(vinyl butyral).

10 . The sheet of claim 1 , wherein the polymeric sheet is a multilayer polymeric sheet.

11 . A method for deairing and laminating two glass panels and the textured polymeric sheet of claim 1 , disposed between said panels, which comprises:
a. applying the textured polymeric sheet to a sheet of glass, and a second piece of glass applied thereon, to form a glass/polymeric sheet/glass structure, wherein the glass or the structure is heated to a temperature of 40° C. to 80° C. to provide a combined structure; followed by b. processing the combined structure through a nip-roller, wherein the initial compression is performed through a pre-determined gap of 60 to 85% of the combined structure thickness and a nip-roller of 40 psi to 110 psi, thereby providing light transmission values of greater than 80%; c. followed by autoclaving said laminate using peak autoclaving temperature of 125° C. to 155° C., peak pressure of 40 psi to 200 psi, and peak hold time of 20 minutes to 60 minutes.

12 . A method for deairing and laminating two glass panels and the textured polymeric sheet of claim 1 , wherein the textured polymeric sheet is disposed between the glass panels, comprising:
a. applying the textured polymeric sheet to a sheet of glass, and a second piece of glass applied thereon, to form a glass/polymeric sheet/glass structure, wherein the glass or the structure is heated to a temperature of 30° to 70° C. to provide a combined structure; followed by b. processing the combined structure through a nip-roller, wherein the initial compression is performed through a pre-determined gap of 60 to 85% of the combined structure thickness and a nip-roller pressure of 40 psi to 110 psi; c. followed by heating said laminate to a temperature of 90° C. to 110° C.; d. followed by again processing the combined structure through a nip-roller, wherein the initial compression is performed through a pre-determined gap of 60 to 85% of the combined structure thickness and a nip-roller pressure of 40 psi to 110 psi, thereby providing a laminate structure having light transmission values of greater than 80%.

13 . The method of claim 11 , wherein the light transmission value is greater than 85%.

Assignees

• Solutia Inc

Inventors

• Yacovone Vincent J
• Lu Jun

Classifications

• B32B17/10926

  by spraying · CPC title

• B32B17/10816

  by pressing · CPC title

• B32B17/10761

  containing vinyl acetal · CPC title

• B32B17/10036

  comprising two outer glass sheets · CPC title

• B32B17/10935

  as a preformed layer, e.g. formed by extrusion · CPC title