Vehicle front glass

Patent metadata

Field	Value
Publication number	US-2016151996-A1
Application number	US-201414906591-A
Country	US
Kind code	A1
Filing date	Aug 1, 2014
Priority date	Aug 1, 2013
Publication date	Jun 2, 2016
Grant date	—

Abstract

The present invention aims to provide a vehicular windshield having a laminated glass structure in which an interlayer film for laminated glass is interposed between at least a pair of glass plates, which contains few air bubbles remaining between the glass plates and the interlayer film for laminated glass to have an excellent appearance and is less likely to cause ghosting when external rays of light are seen through the vehicular windshield.

First claim

1 . A vehicular windshield having a laminated glass structure, comprising at least a pair of glass plates and an interlayer film for laminated glass interposed between the pair of glass plates,
the interlayer film for laminated glass including a laminate of two or more resin layers and having a large number of recesses and a large number of projections on at least one surface, the recesses having a groove shape with a continuous bottom and being regularly arranged adjacently in parallel with one another, the surface with the large number of recesses and the large number of projections having a groove depth (Rzg) of the recesses determined in conformity with JIS B-0601 (1994) of 10 to 40 μm, the groove shape with a continuous bottom of the recesses on the surface of the interlayer film for laminated glass being arranged in a direction that forms an angle of 30° or less relative to a perpendicular direction of the vehicular windshield.

2 . The vehicular windshield according to claim 1 ,
wherein the recesses on the surface of the interlayer film for laminated glass are arranged adjacently in parallel with one another at equal intervals.

3 . The vehicular windshield according to claim 1 ,
wherein the resin layers included in the interlayer film for laminated glass each contain polyvinyl acetal and a plasticizer.

4 . The vehicular windshield according to claim 3 ,
wherein the interlayer film for laminated glass
includes at least a first resin layer and a second resin layer, and the polyvinyl acetal in the first resin layer has a hydroxy group content different from a hydroxy group content of the polyvinyl acetal in the second resin layer.

5 . The vehicular windshield according to claim 3 ,
wherein a plasticizer content based on 100 parts by mass of the polyvinyl acetal in the first resin layer is different from a plasticizer content based on 100 parts by mass of the polyvinyl acetal in the second resin layer.

6 . A vehicular windshield comprising at least a pair of glass plates and an interlayer film for laminated glass interposed between the pair of glass plates,
the interlayer film for laminated glass including a laminate of a sound insulation layer interposed between two protective layers, the sound insulation layer containing 45 to 80 parts by mass of a plasticizer based on 100 parts by mass of polyvinyl acetal, the protective layers each containing 20 to 45 parts by mass of a plasticizer based on 100 parts by mass of polyvinyl acetal, at least one of the protective layers having a large number of recesses and a large number of projections on a surface, the recesses having a groove shape with a continuous bottom and being regularly arranged adjacently in parallel with one another, the groove shape with a continuous bottom of the recesses on the surface of the at least one of the protective layers being arranged in a direction that forms an angle of 30° or less relative to a perpendicular direction of the vehicular windshield.

7 . The vehicular windshield according to claim 2 ,
wherein the resin layers included in the interlayer film for laminated glass each contain polyvinyl acetal and a plasticizer.

Assignees

• Sekisui Chemical Co Ltd

Inventors

• Kitano Hirofumi
• Matsumoto Manabu
• Nakayama Kazuhiko

Classifications

• B32B2605/006

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

• B32B17/10036 Primary

  comprising two outer glass sheets · CPC title

• B32B3/28 Primary

  characterised by a layer comprising a deformed thin sheet {, i.e. the layer having its entire thickness deformed out of the plane}, e.g. corrugated, crumpled (B32B29/08 takes precedence) · CPC title

• B32B27/22

  using plasticisers · CPC title

• B32B17/10761

  containing vinyl acetal · CPC title