Intermediate film for laminated glasses, and laminated glass

Patent metadata

Field	Value
Publication number	US-12358264-B2
Application number	US-202217929534-A
Country	US
Kind code	B2
Filing date	Sep 2, 2022
Priority date	Mar 30, 2017
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

Provided is an interlayer film for laminated glass with which double images in laminated glass can be significantly suppressed. An interlayer film for laminated glass according to the present invention has one end, and the other end having a larger thickness than the one end, the interlayer film has a region for display corresponding to a display region of a head-up display, and when first partial wedge angles θ1 are calculated in respective first partial regions of 80 mm in the direction connecting the one end and the other end centered at respective selected points, second partial wedge angles θ2 are calculated in respective second partial regions of 40 mm in the direction connecting the one end and the other end centered at respective selected points, and |θ1-θ2| is calculated from θ1 and θ2 in the first partial region and the second partial region centered at the same point in the direction connecting the one end and the other end, a maximum value among all values of |θ1-θ2| is 0.2 mrad or less, and the interlayer film as a whole has a wedge angle of 0.1 mrad or more.

First claim

The invention claimed is:

1. An interlayer film for laminated glass having a one end, and an other end being at an opposite side of the one end,
the other end having a thickness larger than a thickness of the one end,
the interlayer film having a part where an increment of the thickness increases from the one end side to the other end side in a region where the thickness increases from the one end side to the other end side, or having a part where an increment of the thickness decreases from the one end side to the other end side in the region where the thickness increases from the one end side to the other end side,
a maximum value of among 250 values of |θ1-θ2| in the interlayer film being 0.2 mrad or less,
a maximum value of among 250 values of |θ1-θ4| in the interlayer film being 0.09 mrad or more and 0.15 mrad or less,
the interlayer film as a whole having a wedge angle of 0.1 mrad or more,
wherein 250 values of |θ1-θ2| are obtained via the following methodology:
250 points are selected at 2 mm intervals from a position of 10 cm from the one end toward the other end of the interlayer film,
first partial wedge angles θ1 in respective 250 first partial regions of 80 mm in the direction connecting the one end and the other end of the interlayer film centered at the respective 250 points are calculated,
second partial wedge angles θ2 in respective 250 second partial regions of 40 mm in the direction connecting the one end and the other end of the interlayer film centered at the respective 250 points are calculated, and
250 values of |θ1-θ2| are calculated from θ1 and θ2 in the first partial region and the second partial region centered at the same point in the direction connecting the one end and the other end of the interlayer film, and
wherein 250 values of |θ1-θ4| are obtained via the following methodology:
fourth partial wedge angles θ4 in respective 250 fourth partial regions of 10 mm in the direction connecting the one end and the other end of the interlayer film centered at the respective 250 points are calculated, and
250 values of |θ1-θ4| are calculated from θ1 in first partial region and θ4 in fourth partial region centered at the same point in the direction connecting the one end and the other end of the interlayer film.

2. The interlayer film for laminated glass according to claim 1 , wherein a maximum value of among 250 values of |θ1-θ3| in the interlayer film is 0.2 mrad or less and 250 values of |θ1-θ3| are obtained via the following methodology:
third partial wedge angles θ3 in respective 250 third partial regions of 20 mm in the direction connecting the one end and the other end of the interlayer film centered at the respective 250 points are calculated, and
250 values of |θ1-θ3| are calculated from θ1 and θ3 in the first partial region and the third partial region centered at the same point in the direction connecting the one end and the other end of the interlayer film.

3. The interlayer film for laminated glass according to claim 1 , containing a thermoplastic resin.

4. The interlayer film for laminated glass according to claim 1 , containing a plasticizer.

5. The interlayer film for laminated glass according to claim 1 , comprising:
a first layer; and
a second layer arranged on a first surface side of the first layer.

6. The interlayer film for laminated glass according to claim 5 , wherein
the first layer contains a polyvinyl acetal resin,
the second layer contains a polyvinyl acetal resin, and
a content of a hydroxyl group of the polyvinyl acetal resin in the first layer is lower than a content of a hydroxyl group of the polyvinyl acetal resin in the second layer.

7. The interlayer film for laminated glass according to claim 5 , wherein
the first layer contains a polyvinyl acetal resin,
the second layer contains a polyvinyl acetal resin,
the first layer contains a plasticizer,
the second layer contains a plasticizer, and
a content of the plasticizer in the first layer relative to 100 parts by weight of the polyvinyl acetal resin in the first layer is larger than a content of the plasticizer in the second layer relative to 100 parts by weight of the polyvinyl acetal resin in the second layer.

8. The interlayer film for laminated glass according to claim 1 , having a portion with a sectional shape in the thickness direction of a wedge-like shape in a region between a position of 6 cm from the one end toward the other end and a position of 63.8 cm from the one end toward the other end.

9. The interlayer film for laminated glass according to claim 1 , wherein the interlayer film as a whole has the wedge angle of less than 0.8 mrad.

10. The interlayer film for laminated glass according to claim 1 , wherein the interlayer film as a whole having the wedge angle of 0.7 mrad or less.

11. The interlayer film for laminated glass according to claim 1 , wherein the interlayer film as a whole having the wedge angle of 0.6 mrad or less.

12. The interlayer film for laminated glass according to claim 1 , wherein the interlayer film as a whole having the wedge angle of 0.4 mrad or less.

13. The interlayer film for laminated glass according to claim 1 , further comprising a heat shielding substance, said heat shielding substance containing at least one selected from the group consisting of a phthalocyanine compound, a naphthalocyanine compound, and an anthracyanine compound.

14. The interlayer film for laminated glass according to claim 1 , further comprising a metal salt, said metal salt selected from the group consisting of an alkali metal salt, an alkaline earth metal salt, and a magnesium salt.

15. The interlayer film for laminated glass according to claim 1 , containing an ultraviolet ray screening agent.

16. The interlayer film for laminated glass according to claim 1 , containing an oxidation inhibitor.

17. A laminated glass comprising:
a first lamination glass member;
a second lamination glass member; and
the interlayer film for laminated glass according to claim 4 ,
the interlayer film for laminated glass being arranged between the first lamination glass member and the second lamination glass member.

Assignees

• Sekisui Chemical Co Ltd

Inventors

• Oota Yuusuke
• Tsunoda Ryuta

Classifications

• B60K35/23

  Head-up displays [HUD] (optical aspects of head-up displays G02B27/01) · CPC title

• B60J1/02

  arranged at the vehicle front {, e.g. structure of the glazing, mounting of the glazing (on windscreen mounted antenna wire H01Q1/1271)} · CPC title

• B32B2605/006

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

• B32B27/22

  using plasticisers · CPC title

• B32B17/10568 Primary

  varying in thickness · CPC title