Interlayer film and laminated glass comprising the same

Patent metadata

Field	Value
Publication number	US-2020354534-A1
Application number	US-202016823545-A
Country	US
Kind code	A1
Filing date	Mar 19, 2020
Priority date	May 10, 2019
Publication date	Nov 12, 2020
Grant date	—

Abstract

The present disclosure relates to an interlayer film for laminated glass comprising: (a) polyvinyl butyral (PVB) resin having an average molecular weight (Mw) as measured by Gel Permeation Chromatography (GPC) from about 175,000 to about 210,000 Dalton; and (b) about 30 to about 50 parts per hundred (pph) of a plasticizer. The interlayer film interposed between two glass sheets forms laminated glass having a pummel adhesion value that is greater in an outer area of the laminated glass than in a middle area of the laminated glass after the laminated glass has been maintained at 50° C. and 95% relative humidity (RH) for 28 days. The laminated glass exhibits improved durability and does not delaminate over time, even in the presence of high temperature and humidity conditions.

First claim

1 . An interlayer film that when interposed between two glass sheets forms laminated glass having a pummel adhesion value that is greater in an outer area of the laminated glass than in an middle area of the laminated glass after the laminated glass has been maintained at 50° C. and 95% relative humidity (RH) for 28 days,
the outer area of the laminated glass being the area formed by outer edges of a perimeter of the laminated glass and extending inward toward the center of the laminated glass by a distance of 5 mm, and
the middle area of the laminated glass is an area in the middle of the laminated glass having a size of 50 mm×50 mm.

2 . The interlayer film of claim 1 , wherein the pummel adhesion value of the outer area of the laminated glass differs from pummel adhesion value of the middle area of the laminated glass by at least 2 after the laminated glass has been maintained at 50° C. and 95% relative humidity (RH) for 28 days.

3 . The interlayer film of claim 1 , wherein pummel adhesion value of the outer area of the laminated glass is at least 8 after the laminated glass has been maintained at 50° C. and 95% relative humidity (RH) for 28 days.

4 . The interlayer film of claim 1 , wherein pummel adhesion value of the outer area of the laminated glass is at least 9 after the laminated glass has been maintained at 50° C. and 95% relative humidity (RH) for 28 days.

5 . The interlayer film of claim 1 , wherein pummel adhesion value of the middle area of the laminated glass is from 4 to 7 and the pummel adhesion value of the outer area of the laminated glass differs from pummel adhesion value of the middle area of the laminated glass by at least 2 after the laminated glass has been maintained at 50° C. and 95% relative humidity (RH) for 28 days.

6 . The interlayer film of claim 1 , wherein the pummel adhesion value of the middle area of the laminated glass is essentially unchanged after the laminated glass has been maintained at 50° C. and 95% relative humidity (RH) for 28 days.

7 . Laminated glass comprising an interlayer film of claim 1 .

Assignees

• Chang Chun Petrochemical Co Ltd

Inventors

• Chang Chin-Yen
• Wang Cheng-Fan

Classifications

• B32B27/18

  characterised by the use of special additives · CPC title

• B32B17/10688 Primary

  Adjustment of the adherence to the glass layers · CPC title

• B32B2307/50

  having particular mechanical properties · CPC title

• B32B27/42

  comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines · CPC title

• C09J11/06

  organic · CPC title