Interlayer for laminated glass and laminated glass

Patent metadata

Field	Value
Publication number	US-9789668-B2
Application number	US-201414452900-A
Country	US
Kind code	B2
Filing date	Aug 6, 2014
Priority date	Sep 30, 2008
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

The present invention provides an interlayer film for laminated glass, that exhibits an excellent sound-insulating performance for solid-borne sound in an environment at or below 0° C. Another object is to provide laminated glass that is obtained using this interlayer film for laminated glass. The present invention is an interlayer film for laminated glass, that has a sound-insulating layer for which a temperature T1, which is the temperature that gives the maximum value of tan δ at a frequency of 1 Hz, is in the range from −30° C. to 0° C.

First claim

The invention claimed is:

1. An interlayer film for laminated glass,
comprising a sound-insulating layer for which a temperature T1, which is a temperature that gives a maximum value of tan δ at a frequency of 1 Hz, is in a range from −30° C. to 0° C.,
wherein the sound-insulating layer contains 71 parts by weight or more of a plasticizer with respect to 100 parts by weight of a polyvinyl acetal resin that has 3 or 4 carbons in an acetal group,
wherein the polyvinyl acetal resin that has 3 or 4 carbons in the acetal group has an acetyl group content of 5.1 to 30 mol % and a hydroxyl group content of 18.5 mol % or more, and
wherein the sound-insulating layer is interposed between two protective layers.

2. The interlayer film for laminated glass according to claim 1 ,
wherein the plasticizer content is 160 parts by weight or less with respect to 100 parts by weight of the polyvinyl acetal resin that has 3 or 4 carbons in the acetal group.

3. The interlayer film for laminated glass according to claim 1 ,
wherein the polyvinyl acetal resin that has 3 or 4 carbons in the acetal group has an average degree of polymerization of 2600 or more.

4. The interlayer film for laminated glass according to claim 1 ,
wherein the hydroxyl group content in the polyvinyl acetal resin that has 3 or 4 carbons in the acetal group is 21.5 mol % or less.

5. The interlayer film for laminated glass according to claim 1 ,
wherein a temperature T2, which is a temperature that gives a maximum value of tan δ for the protective layer at a frequency of 1 Hz, is greater than T1.

6. The interlayer film for laminated glass according to claim 1 ,
wherein a temperature T2, which is a temperature that gives a maximum value of tan δ for the protective layer at a frequency of 1 Hz, is in a range from 0° C. to 40° C.

7. The interlayer film for laminated glass according to claim 1 ,
wherein the protective layer contains 25 to 50 parts by weight of a plasticizer with respect to 100 parts by weight of a polyvinyl acetal resin that has 3 or 4 carbons in an acetal group, a degree of acetalation of 60 to 75 mol %, and an acetyl group content of 10 mol % or less.

8. A laminated glass,
which comprises the interlayer film for laminated glass according to claim 1 interposed between two transparent sheets.

9. The interlayer film for laminated glass according to claim 1 , wherein a thickness of the sound-insulating layer is 100 μm.

Assignees

• Sekisui Chemical Co Ltd

Inventors

• Matsuda Shouta
• Nakamura Kozo
• Shimamoto Michio
• Yang Sinyul

Classifications

• C08K5/103

  with polyalcohols · CPC title

• Y10T428/3163

  Next to acetal of polymerized unsaturated alcohol [e.g., formal butyral, etc.] · CPC title

• C08K5/0016

  Plasticisers · CPC title

• Y10T428/31627

  Next to aldehyde or ketone condensation product · CPC title

• B32B17/10761 Primary

  containing vinyl acetal · CPC title