Interlayer for laminated glass, laminated glass, production method for embossing roll, and production method for interlayer for laminated glass

Patent metadata

Field	Value
Publication number	US-10933612-B2
Application number	US-201615554247-A
Country	US
Kind code	B2
Filing date	Apr 8, 2016
Priority date	Apr 10, 2015
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

The present invention aims to provide an interlayer film for a laminated glass having recesses in the shape of engraved lines on both surfaces to exhibit excellent deaeration properties in production of a laminated glass and suppressing formation of a moire pattern when unwound from a rolled body thereof. The present invention also aims to provide a laminated glass including the interlayer film for a laminated glass, a method for producing an embossing roll suitably used for production of the interlayer film for a laminated glass, and a method for producing the interlayer film for a laminated glass. The present invention relates to an interlayer film for a laminated glass, having a large number of recesses on both surfaces, the recesses each having a groove shape with a continuous bottom and being regularly adjacent and parallel to each other, the interlayer film having a glossiness on a surface with the large number of recesses measured in conformity with JIS Z 8741-1997 of higher than 3% or a haze value measured in conformity with JIS K 7105-1981 of 87% or lower.

First claim

The invention claimed is:

1. An interlayer film for a laminated glass, having recesses on both surfaces,
the recesses each having a groove shape with a continuous bottom and being regularly adjacent and parallel to each other,
the interlayer film having a glossiness on a surface with the recesses measured in conformity with JIS Z 8741-1997 of higher than 3% and a haze value measured in conformity with JIS K 7105-1981 of 87% or lower,
wherein an interval Sm between the recesses each having a groove shape with a continuous bottom is 350 μm or less, and
wherein the interlayer film includes a resin layer comprising polyvinyl acetal and a plasticizer.

2. A laminated glass comprising:
a pair of glass plates; and
the interlayer film for a laminated glass according to claim 1 interposed between the pair of glass plates.

3. A method for producing the interlayer film for a laminated glass according to claim 1 , said method comprising
providing recesses on at least one surface of an interlayer film for a laminated glass by an embossing roll method using an embossing roll produced by a method comprising:
an embossing roll production step 1 of forming protrusions and recesses on a metal roll by blasting with an abrasive material;
an embossing roll production step 2 of grinding a protion of each protrusion on the metal roll provided with the protrusions and recesses into a flat surface portion; and
an embossing roll production step 3 of forming protrusions and recesses by blasting with an abrasive material finer than the abrasive material used in the embossing roll production step 1.

4. A method for producing the interlayer film for a laminated glass according to claim 1 ,
the method being intended to form recesses on at least one surface of an interlayer film for a laminated glass by an embossing method in which melt fracture phenomena are controlled, the method comprising the step of:
extruding a resin composition from a die to form an interlayer film for a laminated glass; and
cooling the extruded interlayer film for a laminated glass in a cooling water tank, a distance between the die and the cooling water tank being adjusted to 250 mm or shorter in the cooling.

5. A method for producing the interlayer film for a laminated glass according to claim 1 , said method comprising
providing recesses on at least one surface of an interlayer film for a laminated glass by an embossing roll method using an embossing roll produced by a method comprising:
an embossing roll production step 1 of forming protrusions and recesses on a metal roll by blasting with an abrasive material;
an embossing roll production step 2 of grinding a portion of each protrusion on the metal roll provided with the protrusions and recesses into a flat surface portion; and
an embossing rill production step 3 of forming protrusions and recesses by blasting with an abrasive material finer than the abrasive material used in the embossing roll production step 1,
wherein the abrasive material used in the embossing roll production step 3 has a grain diameter at a cumulative height of 3% in conformity with JIS R6001 (1998) of 11 μm or more.

6. The interlayer film for a laminated glass according to claim 1 , having a haze value measured in conformity with JIS K 7105-1981 of 72% to 87%.

Assignees

• Sekisui Chemical Co Ltd

Inventors

• Nakayama Kazuhiko
• Omizu Morimasa
• Kondou Masaya

Classifications

• B24C1/08

  for polishing surfaces, e.g. {smoothing a surface} by making use of liquid-borne abrasives · CPC title

• B24C1/006

  using material without particles or pellets for deburring, removal of extended surface areas or jet milling of local recessions, e.g. grooves · CPC title

• B24C1/00

  Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods · CPC title

• B32B17/10587

  created by embossing · CPC title

• B32B2605/006

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