Interlayer for laminated glass, and laminated glass

Patent metadata

Field	Value
Publication number	US-2018209207-A1
Application number	US-201615745969-A
Country	US
Kind code	A1
Filing date	Sep 8, 2016
Priority date	Sep 11, 2015
Publication date	Jul 26, 2018
Grant date	—

Abstract

There is provided an interlayer film for laminated glass with which the flexural rigidity of laminated glass can be enhanced and the sound insulating properties of laminated glass can be enhanced. The interlayer film for laminated glass according to the present invention includes first, second, and third layers containing a thermoplastic resin and a plasticizer, Cloud point 1 concerning the first layer is lower than each of Cloud point 2 concerning the second layer and Cloud point 3 concerning the third layer, each of Absolute value XA of a difference between the Cloud point 1 and the Cloud point 2 and Absolute value XB of a difference between the Cloud point 1 and the Cloud point 3 is 118° C. or more, and when a content of the plasticizer in the interlayer film for laminated glass relative to 100 parts by weight of the thermoplastic resin in the interlayer film for laminated glass is defined as Y, XA, XB, and Y satisfy the equations of Y≤−0.16XA+60 and Y≤−0.16XB+60.

First claim

1 . An interlayer film for laminated glass, having a three or more-layer structure and containing a thermoplastic resin and a plasticizer, comprising:
a first layer containing a thermoplastic resin and a plasticizer; a second layer being layered on a first surface of the first layer and containing a thermoplastic resin and a plasticizer; and a third layer being layered on a second surface opposite to the first surface of the first layer and containing a thermoplastic resin and a plasticizer, Cloud point 1 determined with the use of a liquid prepared by dissolving 8 parts by weight of the thermoplastic resin for the first layer in 100 parts by weight of the plasticizer for the first layer being lower than each of Cloud point 2 determined with the use of a liquid prepared by dissolving 8 parts by weight of the thermoplastic resin for the second layer in 100 parts by weight of the plasticizer for the second layer and Cloud point 3 determined with the use of a liquid prepared by dissolving 8 parts by weight of the thermoplastic resin for the third layer in 100 parts by weight of the plasticizer for the third layer, each of Absolute value XA of a difference between the Cloud point 1 and the Cloud point 2 and Absolute value XB of a difference between the Cloud point 1 and the Cloud point 3 being 118° C. or more, and when a content of the plasticizer in the interlayer film for laminated glass relative to 100 parts by weight of the thermoplastic resin in the interlayer film for laminated glass is defined as Y, XA, XB, and Y satisfying the equations of Y≤−0.16XA+60 and Y≤−0.16XB+60.

2 . The interlayer film for laminated glass according to claim 1 , wherein the content of the plasticizer in the first layer relative to 100 parts by weight of the thermoplastic resin in the first layer is larger than the content of the plasticizer in the second layer relative to 100 parts by weight of the thermoplastic resin in the second layer.

3 . The interlayer film for laminated glass according to claim 1 , wherein the content of the plasticizer in the first layer relative to 100 parts by weight of the thermoplastic resin in the first layer is larger than the content of the plasticizer in the third layer relative to 100 parts by weight of the thermoplastic resin in the third layer.

4 . The interlayer film for laminated glass according to claim 1 , wherein the Cloud point 1 is 0° C. or more and 40° C. or less.

5 . The interlayer film for laminated glass according to claim 4 , wherein the Cloud point 1 is more than 5° C. and 30° C. or less.

6 . The interlayer film for laminated glass according to claim 1 , wherein each of the Cloud point 2 and the Cloud point 3 is 125° C. or more and 180° C. or less.

7 . The interlayer film for laminated glass according to claim 6 , wherein each of the Cloud point 2 and the Cloud point 3 is 135° C. or more and 170° C. or less.

8 . The interlayer film for laminated glass according to claim 1 , wherein the content of the plasticizer in the first layer relative to 100 parts by weight of the thermoplastic resin in the first layer is 55 pans by weight or more and 100 parts by weight or less.

9 . The interlayer film for laminated glass according to claim 1 , wherein each of the content of the plasticizer in the second layer relative to 100 parts by weight of the thermoplastic resin in the second layer and the content of the plasticizer in the third layer relative to 100 parts by weight of the thermoplastic resin in the third layer is 50 parts by weight or less.

10 . The interlayer film for laminated glass according to claim 1 , wherein the content Y of the plasticizer in the interlayer film for laminated glass relative to 100 parts by weight of the thermoplastic resin in the interlayer film for laminated glass is 25 parts by weight or more and 40 parts by weight or less.

11 . The interlayer film for laminated glass according to claim 1 , wherein the thermoplastic resin in the first layer is a polyvinyl acetal resin,
the thermoplastic resin in the second layer is a polyvinyl acetal resin, and the thermoplastic resin in the third layer is a polyvinyl acetal resin.

12 . The interlayer film for laminated glass according to claim 11 , wherein the content of the hydroxyl group of the polyvinyl acetal resin in the first layer is lower than the content of the hydroxyl group of the polyvinyl acetal resin in the second layer.

13 . The interlayer film for laminated glass according to claim 1 , being used together with a first glass plate having a thickness of less than 2 mm and being arranged between the first glass plate and a second glass plate to obtain laminated glass.

14 . Laminated glass, comprising:
a first lamination glass member; a second lamination glass member; and the interlayer film for laminated glass according to claim 1 , the interlayer film for laminated glass being arranged between the first lamination glass member and the second lamination glass member.

15 . The laminated glass according to claim 14 , wherein the first lamination glass member is a first glass plate and
the thickness of the first glass plate is less than 2 mm.

Assignees

• Sekisui Chemical Co Ltd

Inventors

• Iwamoto Tatsuya
• Minakuchi Nami

Classifications

• B32B2307/546

  Flexural strength; Flexion stiffness · CPC title

• B32B17/10605

  Type of plasticiser · CPC title

• B32B17/10761 Primary

  containing vinyl acetal · CPC title

• B32B2309/105

  Thickness · CPC title

• B32B2605/006

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