Intermediate film for laminated glass, and laminated glass

• US 10,696,020 B2
• Filed: 10/31/2018
• Issued: 06/30/2020
• Est. Priority Date: 09/29/2014
• Status: Active Grant

• Current Assignee: Sekisui Chemical Company Limited (Sekisui)
• Original Assignee: Sekisui Chemical Company Limited (Sekisui)
• Inventors: Oota, Yuusuke, Tsunoda, Ryuta
• Primary Examiner(s): Thomas, Brandi N
• Application Number:
  US16/177,052
• Publication Number:
  US 20190061322A1
• Time in Patent Office: 608 Days
• Field of Search: 359619-631
• CPC Class Codes: B32B 17/10568 varying in thickness
• CPC Class Codes: B32B 17/10605 Type of plasticiser
• CPC Class Codes: B32B 17/10633 Infrared radiation absorbing or reflecting agents
• CPC Class Codes: B32B 17/10651 comprising colorants, e.g. dyes or pigments
• CPC Class Codes: B32B 17/10678 comprising UV absorbers or stabilizers, e.g. antioxidants
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 2307/306 Resistant to heat
• CPC Class Codes: B32B 2605/006 Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B60J 1/00 Windows; Windscreens; Accessories therefor B60J10/00 takes precedence; air curtains instead of windows B60J9/04 ; sealing strips for windshields B60J10/70; sealing sash guides for sliding window panes B60J10/74; glass partitions inside vehicles to protect occupants against personal attack B60R21/12
• CPC Class Codes: B60J 1/02 arranged at the vehicle front , e.g. structure of the glazing, mounting of the glazing on windscreen mounted antenna wire H01Q1/1271
• CPC Class Codes: C01G 41/02 Oxides; Hydroxides
• CPC Class Codes: C08K 2003/2258 of tungsten
• CPC Class Codes: C08K 3/08 Metals
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 5/0041 Optical brightening agents, organic pigments
• CPC Class Codes: C08L 29/14 Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols

Abstract

There is provided an interlayer film for laminated glass with which a low yellow index value, low excitation purity and high heat shielding properties can be achieved in spite of the thickness varying with places. The interlayer film for laminated glass according to the present invention has a thickness of one end thinner than a thickness of the other end at the opposite side of the one end and includes a thermoplastic resin, an ultraviolet ray screening agent and tungsten oxide particles, and the ultraviolet ray screening agent is a benzotriazole-based ultraviolet ray screening agent.

Claims

1. An interlayer film for laminated glass having a thickness of one end thinner than a thickness of the other end at the opposite side of the one end and including a thermoplastic resin, an ultraviolet ray screening agent and tungsten oxide particles,

the ultraviolet ray screening agent being a benzotriazole-based ultraviolet ray screening agent, and

when the distance between the one end and the other end of the interlayer film is defined as X, the excitation purity at a point positioned at a distance of 0.1X from the one end toward the inside is 0.9 or more.

2. The interlayer film for laminated glass according to claim 1, wherein, when the distance between the one end and the other end of the interlayer film is defined as X, the excitation purity at a point positioned at a distance of 0.1X from the other end toward the inside is 2.6 or less.

3. The interlayer film for laminated glass according to claim 1, wherein, when the distance between the one end and the other end of the interlayer film is defined as X, the absolute value of the difference between the excitation purity at a point positioned at a distance of 0.1X from the other end toward the inside and the excitation purity at a point positioned at a distance of 0.1X from the one end toward the inside is 1.1 or less.

4. The interlayer film for laminated glass according to claim 1, further having a portion in which the sectional shape in the thickness direction is a wedge-like shape.

5. A laminated glass, comprising:

a first laminated glass member;

a second laminated glass member; and

the interlayer film for laminated glass according to claim 1,

the interlayer film for laminated glass being arranged between the first laminated glass member and the second laminated glass member.

6. The interlayer film for laminated glass according to claim 1, having a wedge angle θ

of 0.01 mrad or more.

7. The interlayer film for laminated glass according to claim 1, further including an oxidation inhibitor.