Interlayer for laminated glass and laminated glass

Patent metadata

Field	Value
Publication number	US-9649828-B2
Application number	US-201113876062-A
Country	US
Kind code	B2
Filing date	Sep 30, 2011
Priority date	Sep 30, 2010
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

The present invention aims to provide an intermediate film for laminated glass which, in the case of being used for constituting a laminated glass, enables to improve the sound-insulating property of a laminated glass to be obtained; and a laminated glass. The intermediate film 1 for laminated glass of the present invention comprises a first layer 2 which contains a polyvinyl acetal resin and a plasticizer and the degree of acetylation of the polyvinyl acetal resin contained in the first layer 2 exceeds 30 mol %; and The laminated glass of the present invention comprises first and second components for laminated glass, and the intermediate film 1 for laminated glass sandwiched between the first and second components for laminated glass.

First claim

The invention claimed is:

1. An intermediate film for laminated glass with a laminated structure of three or more layers, comprising:
a first layer containing a polyvinyl acetal resin and an organic ester plasticizer,
a second layer laminated on a first surface of the first layer, the second layer comprising a polyvinyl acetal resin and an organic ester plasticizer, and
a third layer laminated on a second surface of the first layer that is opposite to the first surface of the first layer, the third layer comprising a polyvinyl acetal resin and an organic ester plasticizer;
wherein a degree of acetylation of the polyvinyl acetal resin contained in the first layer exceeds 30 mol %,
a degree of acetylation of the polyvinyl acetal resin contained in the second layer is 0.1 mol % or higher and 20 mol % or lower, and
a degree of acetylation of the polyvinyl acetal resin contained in the third layer is 0.1 mol % or higher and 20 mol % or lower,
wherein an amount of the organic ester plasticizer in the second layer is 15 parts by weight or more and 45 parts by weight or less for each 100 parts by weight of the polyvinyl acetal resin in the second layer, and an amount of the organic ester plasticizer in the third layer is 15 parts by weight or more and 45 parts by weight or less for each 100 parts by weight of the polyvinyl acetal resin in the third layer,
wherein an amount of the organic ester plasticizer for each 100 parts by weight of the polyvinyl acetal resin in the second layer is lower than an amount of the organic ester plasticizer for each 100 parts by weight of the polyvinyl acetal resin in the first layer and an amount of the organic ester plasticizer for each 100 pans by weight of the polyvinyl acetal resin in the third layer is lower than an amount of the organic ester plasticizer for each 100 parts by weight of the polyvinyl acetal resin in the first layer,
wherein an amount of the organic ester plasticizer in the first layer is 50 parts by weight or more for each 100 parts by weight of the polyvinyl acetal resin in the first layer,
a hydroxy group content in the polyvinyl acetal resin contained in the first layer is lower than a hydroxy group content in the polyvinyl acetal resin contained in the second layer, and
the difference between the hydroxy group content in the polyvinyl acetal resin contained in the first layer and the hydroxy group content in the polyvinyl acetal resin contained in the second layer is 9.2 mol % or smaller,
wherein the polyvinyl acetal resin contained in the first layer contains a high-molecular-weight component with an absolute molecular weight of 1,000,000 or higher and a proportion of the high-molecular-weight component in the polyvinyl acetal resin contained in the first layer is 7.4% or higher, or
the polyvinyl acetal resin contained in the first layer contains a high-molecular-weight component with a molecular weight in terms of polystyrene of 1,000,000 or higher and a proportion of the high-molecular-weight component with a molecular weight in terms of polystyrene in the polyvinyl acetal resin contained in the first layer is 9% or higher, and
wherein a ratio (G′(Tg+80)/G′(Tg+30)) of an elastic modulus G′(Tg+80) at (Tg+80)° C. to an elastic modulus G′(Tg+30) at (Tg+30)° C. is 0.65 or higher, provided that a resin film containing 100 parts by weight of the polyvinyl acetal resin contained in the first layer and 60 parts by weight of triethylene glycol di-2-ethyl hexanoate (3GO) as a plasticizer is prepared and a viscoelasticity of the resin film is measured, and that Tg (° C.) represents a glass transition temperature of the resin film.

2. The intermediate film for laminated glass according to claim 1 ,
wherein a ratio (G′(Tg+80)/G′(Tg+30)) of an elastic modulus G′(Tg+80) at (Tg+80)° C. to an elastic modulus G′(Tg+30) at (Tg+30)° C. is 0.65 or higher, provided that the first layer is used as a resin film and a viscoelasticity of the resin film is measured, and that Tg (° C.) represents a glass transition temperature of the resin film.

3. The intermediate film for laminated glass according to claim 1 ,
wherein the polyvinyl acetal resin contained in the first layer is obtained by acetalizing a polyvinyl alcohol resin having an average degree of polymerization exceeding 3,000.

4. The intermediate film for laminated glass according to claim 1 ,
wherein the acetal group in the polyvinyl acetal resin of one or more of the first, second and third layers has a carbon number of 3 to 5.

5. The intermediate film for laminated glass according to claim 1 ,
wherein the polyvinyl acetal resin of one or more of the first, second and third layers is a polyvinyl butyral resin.

6. The intermediate film for laminated glass according to claim 1 ,
wherein the polyvinyl acetal resin of the first layer has a hydroxy group content of 45 mol % or lower.

7. A laminated glass, comprising:
a first component for laminated glass;
a second component for laminated glass; and
an intermediate film sandwiched between the first component for laminated glass and the second component for laminated glass,
wherein the intermediate film is the intermediate film for laminated glass according to claim 1 .

Assignees

• Shimamoto Michio
• Matsuda Shota
• Yang Sinyul
• Kani Kohei
• Iwamoto Tatsuya
• Sekisui Chemical Co Ltd

Inventors

• Shimamoto Michio
• Matsuda Shota
• Yang Sinyul
• Kani Kohei
• Iwamoto Tatsuya

Classifications

• B32B17/10761 Primary

  containing vinyl acetal · CPC title

• B32B2605/18

  Aircraft · CPC title

• B32B17/10036

  comprising two outer glass sheets · CPC title

• B32B2605/12

  Ships · CPC title

• C08K5/0016

  Plasticisers · CPC title