# US 10,870,254 B2 · Interlayer film for laminated glass and laminated glass

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- Number: US 10,870,254 B2
- Document ID: US10870254B2
- Status: Granted
- Kind: B2
- Application number: 14/905,995
- Filed: 2014-08-01
- Published: 2016-06-02
- Granted: 2020-12-22
- Earliest claimed: 2013-08-01
- Assignees: Sekisui Chemical Co., Ltd.
- Applicants: Sekisui Chemical Co., Ltd.
- Inventors: Hirofumi Kitano; Hiroaki Inui; Taiki Katayama; Manabu Matsumoto; Kazuhiko Nakayama
- Web page: https://patentgrep.com/patent/US10870254B2

## CPC

- B32B 3/28: 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)
- B32B 3/00: Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B 3/02: characterised by features of form at particular places, e.g. in edge regions {(non-uniform thickness B32B3/263)}
- B32B 3/30: characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)}
- B32B 7/00: Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B 7/022: Mechanical properties
- B32B 7/027: Thermal properties
- B32B 7/06: permitting easy separation
- B32B 7/10: at least one layer having inter-reactive properties
- B32B 17/10: of synthetic resin
- B32B 17/10587: {created by embossing}
- B32B 17/10761: {containing vinyl acetal}
- B32B 27/00: Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)}
- B32B 27/06: as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)}
- B32B 27/08: of synthetic resin
- B32B 27/18: characterised by the use of special additives
- B32B 27/22: using plasticisers
- B32B 27/28: comprising synthetic resins not wholly covered by any one of the sub-groups {B32B27/30 - B32B27/42}
- B32B 27/30: comprising vinyl {(co)polymers; comprising acrylic (co)polymers}
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 2250/00: Layers arrangement
- B32B 2250/03: 3 layers
- B32B 2307/10: having particular acoustical properties
- B32B 2307/102: Insulating
- B32B 2307/40: having particular optical properties
- B32B 2307/412: Transparent
- B32B 2307/50: having particular mechanical properties
- B32B 2307/514: Oriented
- B32B 2307/538: Roughness
- B32B 2307/584: Scratch resistance
- B32B 2307/724: Permeability to gases, adsorption
- B32B 2307/748: Releasability
- B32B 2419/00: Buildings or parts thereof
- B32B 2605/00: Vehicles
- B32B 2605/006: Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
- B32B 2605/08: Cars
- B32B 2605/18: Aircraft
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

The present invention is an interlayer film for laminated glass that includes 2 or more resin layers laminated on each other. The interlayer film for laminated glass has a large number of recesses and a large number of protrusions on at least one surface thereof. The recesses each have a groove shape with a continuous bottom. The recesses adjacent to each other are parallel to each other and regularly arranged in a line.

## Claims

### Claim 1

An interlayer film for laminated glass comprising 2 or more resin layers laminated on each other,
wherein the resin layers contain polyvinyl acetal and a plasticizer,
wherein at least one of the resin layers has a plurality of recesses and a plurality of protrusions on an outer surface such that the interlayer film has the plurality of recesses and the plurality of protrusions on at least one outer surface thereof,
the recesses each have a groove shape with a continuous bottom,
the recesses adjacent to each other are parallel to each other and regularly arranged in a line,
within the at least one outer surface of the interlayer film having the plurality of recesses and the plurality of protrusions, a groove depth (Rzg) of the recesses measured based on JIS B-0601(1994) is 10 μm to 40 μm, and
a 10-point average roughness (Rz) of an inner surface of the resin layer having the plurality of recesses and the plurality of protrusions measured based on JIS B 0601(1994) is less than 2.7 μm,
wherein the 10-point average roughness (Rz) is obtained by:
peeling off the resin layer having the plurality of recesses and the plurality of protrusions from another resin layer in direct contact with the resin layer having the plurality of recesses and the plurality of protrusions to expose the inner surface of the resin layer having the plurality of recesses and the plurality of protrusions, wherein the inner surface of the resin layer having the plurality of recesses and the plurality of protrusions is the surface that was in direct contact with the another resin layer prior to the peeling off, and
then measuring the inner surface of the resin layer having the plurality of recesses and the plurality of protrusions based on JIS B 0601(1994).

### Claim 2 (depends on 1)

The interlayer film for laminated glass according to claim 1,
wherein the recesses adjacent to each other are parallel to each other and arranged in a line at an equal interval.

### Claim 3 (depends on 1)

The interlayer film for laminated glass according to claim 1, comprising at least:
a first resin layer; and
a second resin layer,
wherein the amount of hydroxyl groups of the polyvinyl acetal contained in the first resin layer is different from the amount of hydroxyl groups of the polyvinyl acetal contained in the second resin layer.

### Claim 4 (depends on 1)

The interlayer film for laminated glass according to claim 1,
wherein the content of the plasticizer in the first resin layer with respect to 100 parts by mass of the polyvinyl acetal is different from the content of the plasticizer in the second resin layer with respect to 100 parts of the polyvinyl acetal.

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

The interlayer film for laminated glass according to claim 1,
wherein the plurality of recesses consists of recesses that are parallel to each other and regularly arranged in a line.