# US 10,307,993 B2 · Heat-ray shielding film and method for manufacturing the same, and heat-ray shielding laminated transparent base material

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- Number: US 10,307,993 B2
- Document ID: US10307993B2
- Status: Granted
- Kind: B2
- Application number: 14/009,870
- Filed: 2012-04-12
- Published: 2014-04-17
- Granted: 2019-06-04
- Earliest claimed: 2011-04-14
- Assignees: Sumitomo Metal Mining Co., Ltd.
- Applicants: Kenichi Fujita; Hiroshi Kobayashi
- Inventors: Kenichi Fujita; Hiroshi Kobayashi
- Web page: https://patentgrep.com/patent/US10307993B2

## CPC

- B32B 17/10633: {Infrared radiation absorbing or reflecting agents}
- B32B 17/10688: {Adjustment of the adherence to the glass layers}
- B32B 17/10761: {containing vinyl acetal}
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

To provide a heat-ray shielding film mainly composed of polyvinyl acetal resin and a method for manufacturing the same capable of exhibiting excellent optical characteristics and high weather resistance by using composite tungsten oxide fine particles having a high heat-ray shielding effect, and a heat-ray shielding laminated transparent base material using the heat-ray shielding film, the heat-ray shielding film containing fine particles having a heat-ray shielding function, polyvinyl acetal resin, and a plasticizer, wherein the fine particles having the heat-ray shielding function is expressed by a general formula MyWOz (wherein M is one kind or more elements selected from a group consisting of Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, Sn, Al, and Cu, satisfying 0.1<=y<=0.5, 2.2<=z<=3.0), which are composite tungsten oxide fine particles having a hexagonal crystal structure, the heat-ray shielding film further containing metal carboxylate.

## Claims

### Claim 1

A heat-ray shielding film containing fine particles having a heat-ray shielding function, polyvinyl acetal resin, a metal carboxylate, and a plasticizer,
wherein the fine particles having the heat-ray shielding function consist of composite tungsten oxide fine particles having a hexagonal crystal structure and are expressed by a general formula MyWOz (wherein M is one kind or more elements selected from a group consisting of Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, Sn, Al, and Cu, satisfying 0.1<=y<=0.5, 2.2<=z<=3.0), and
wherein the metal carboxylate is manganese 2-ethylhexanoate, and
wherein a content of the metal carboxylate is from 3 pts.wt. to 500 pts.wt. based on 100 pts.wt. of the composite tungsten oxide fine particles.

### Claim 2 (depends on 1)

The heat-ray shielding film according to claim 1, wherein the composite tungsten oxide fine particles are fine particles with an average particle size of 40 nm or less.

### Claim 3 (depends on 1)

A heat-ray shielding laminated transparent base material, comprising the heat-ray shielding film of claim 1 arranged between a plurality of transparent base materials.

### Claim 4 (depends on 3)

The heat-ray shielding laminated transparent base material according to claim 3, wherein at least one of the transparent base materials is glass.