Intermediate film for laminated glass and laminated glass

Patent metadata

Field	Value
Publication number	US-9238353-B2
Application number	US-98885909-A
Country	US
Kind code	B2
Filing date	Apr 23, 2009
Priority date	Apr 23, 2008
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

An interlayer film for a laminated glass provides excellent vibration damping performance at high temperature and excellent sound insulation in a wide temperature range. The interlayer film comprises a part A containing a resin composition A or a resin A and a part B containing a resin composition B or a resin B, and the part A and the part B are horizontally arranged. The interlayer film for a laminated glass has a difference between temperatures Ta and Tb of 10° C. or larger when the temperature Ta is a temperature at which the resin composition A or the resin A shows a maximum loss tangent of a dynamic viscoelasticity at a frequency of 1 Hz, and the temperature Tb is a temperature at which the resin composition B or the resin B shows a maximum loss tangent of a dynamic viscoelasticity at a frequency of 1 Hz.

First claim

The invention claimed is:

1. An interlayer film for a laminated glass, comprising:
an interlayer film,
wherein said interlayer film for a laminated glass comprises a film part A containing a resin composition A or a resin A, and a film part B containing a resin composition B or a resin B, and two covering layer Ds containing the same resin composition B or the same resin B,
wherein the resin composition A contains polyvinyl acetal resin and/or the resin A is polyvinyl acetal resin,
wherein the resin composition B contains polyvinyl acetal resin and/or the resin B is polyvinyl acetal resin,
wherein the film part A has an upper planar surface, a lower planar surface, and a plurality of side surfaces defining a first portion of the interlayer film, the film part B has an upper planar surface, a lower planar surface, and a plurality of side surfaces defining a second portion of the interlayer film, and the two covering layer Ds have an upper planar surface, a lower planar surface, and a plurality of side surfaces defining a third and fourth portion of the interlayer film,
wherein the resin composition A or the resin A has a temperature Ta at which the resin composition A or the resin A shows a maximum loss tangent of a dynamic viscoelasticity at a frequency of 1 Hz,
wherein the resin composition B or the resin B has a temperature Tb at which the resin composition B or the resin B shows a maximum loss tangent of a dynamic viscoelasticity at a frequency of 1 Hz,
wherein the temperature Tb is larger than the temperature Ta by 10° C. or more,
wherein the film part A and the film part B are horizontally arranged, such that the upper planar surface of the film part A and the upper planar surface of the film part B are horizontally arranged in a same horizontal plane, and the lower planar surface of the film part A and the lower planar surface of the film part B are horizontally arranged in a same horizontal plane, and
wherein the film part A and the film part B are sandwiched between the two covering layer Ds such that one of the third or fourth portions is above the film part A and film part B and the other of the third or fourth portions is below the film part A and film part B.

2. The interlayer film for a laminated glass according to claim 1 , wherein the temperature Ta and the temperature Tb each are in the range of −38 to 42° C.

3. The interlayer film for a laminated glass according to claim 1 , wherein a ratio of an area of the film part A and an area of the film part B is (9:1) to (4:6).

4. The interlayer film for a laminated glass according to claim 1 ,
wherein the film part A and the film part B are horizontally arranged in the form of belts, and
each of the belts has a width of 300 mm or less.

5. The interlayer film for a laminated glass according to claim 1 , further comprising a film part C,
wherein the film part C contains a resin composition C or a resin C which is horizontally arranged with the film part A and the film part B in the same horizontal planes as film parts A and B, and
wherein the resin composition C or the resin C has a temperature Tc at which a loss tangent of a dynamic viscoelasticity of the resin composition C or the resin C at a frequency of 1 Hz is maximum is between the temperature Ta and the temperature Tb.

6. The interlayer film for a laminated glass according to claim 1 ,
wherein the covering layer Ds comprise a resin composition containing 20 to 50 parts by weight of a plasticizer with respect to 100 parts by weight of a polyvinyl acetal resin having an acetal group containing 3 or 4 carbon atoms, an acetalization degree of 60 to 75 mol %, and an acetylation degree of 30 mol % or less.

7. A laminated article, comprising:
a first transparent plate and a second transparent plate,
wherein the interlayer film for a laminated glass according to claim 1 is sandwiched between said first and second transparent plates, one above the covering layer Ds' third or fourth portion and one below the other covering layer Ds' third or fourth portion.

Assignees

• Nakamura Kozo
• Shimamoto Michio
• Sekisui Chemical Co Ltd

Inventors

• Nakamura Kozo
• Shimamoto Michio

Classifications

• C08K5/103

  with polyalcohols · CPC title

• B32B17/10761 Primary

  containing vinyl acetal · CPC title

• C08J2329/14

  Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• B32B2605/00

  Vehicles · CPC title