# US 10,499,629 B2 · Transparent porous sustained-release body and method for producing the same, and kit of sustained-release body, sustained-release apparatus, and sustained-release method

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- Number: US 10,499,629 B2
- Document ID: US10499629B2
- Status: Granted
- Kind: B2
- Application number: 15/748,983
- Filed: 2016-08-05
- Published: 2019-01-10
- Granted: 2019-12-10
- Earliest claimed: 2015-08-11
- Assignees: SnG Inc.
- Applicants: SnG INC.
- Inventors: Riichi Miyamoto; Hongzhi Bai
- Web page: https://patentgrep.com/patent/US10499629B2

## CPC

- A01M 1/2027: {without heating}
- A01M 1/2055: {Holders or dispensers for solid, gelified or impregnated insecticide, e.g. volatile blocks or impregnated pads}
- A61L 9/013: containing animal or plant extracts, or vegetable material
- A61L 9/046: {with the help of a non-organic compound}
- C01B 33/152: Preparation of hydrogels
- C04B 38/00: Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof (treating slag with gases or gas generating material C04B5/06 {; expanded graphite C04B35/536})
- C09K 3/00: Materials not provided for elsewhere
- A61L 9/12: Apparatus, e.g. holders, therefor
- A61L 2209/12: Lighting means
- A01M: CATCHING, TRAPPING OR SCARING OF ANIMALS (appliances for catching swarms or drone-catching A01K57/00; fishing A01K69/00 - {A01K99/00}; biocides, pest repellants or attractants A01N); APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

The present invention provides a porous sustained-release body in which transparency of a porous carrier changes. The porous sustained-release body includes an inorganic monolithic porous body 1 including a skeleton body 2 of an inorganic compound and air gaps 3,4 having a three-dimensional continuous network structure formed in the skeleton body 2, and a sustained-release liquid absorbed into air gaps 2, 3, wherein the inorganic monolithic porous body 1 is opaque at an initial state, which is a state before absorption of the sustained-release liquid in which air exists in the air gaps, and refractive index of the sustained-release liquid and refractive index of the skeleton body are the same within an error range within which a portion in which the sustained-release liquid is absorbed into the air gaps changes to transparent or semitransparent.

## Claims

### Claim 1

A transparent porous sustained-release body comprising an inorganic monolithic porous body including a skeleton body of an inorganic compound and air gaps having a three-dimensional continuous network structure, and a sustained-release liquid absorbed into said air gaps,
wherein
said inorganic monolithic porous body is opaque at an initial state, which is a state before absorption of said sustained-release liquid in which air exists in said air gaps,
a refractive index of said sustained-release liquid and a refractive index of said skeleton body are the same within an error range such that a portion in which said sustained-release liquid is absorbed into said air gaps changes to transparent or semitransparent;
said skeleton body has a three-dimensional continuous network structure,
said air gaps have a two-step hierarchical porous structure including through-holes and pores, the through-holes being formed in voids in said skeleton body and having a three-dimensional continuous network structure, and the pores extending from a surface to an inside of said skeleton body and being dispersively formed on said surface,
a most frequent pore diameter in a pore diameter distribution of said pores is within a range of 2 nm or more and 200 nm or less,
a most frequent pore diameter in a pore diameter distribution of said through-holes is equal to or more than 5 times of said most frequent pore diameter of the pores, and within a range of 0.1 μm or more and 100 μm or less, said refractive index of said skeleton body is 1.45 to 1.5, and said refractive index of said sustained-release liquid is 1.4305 to 1.48 when said most frequent pore diameter of said through-holes is more than 0.6 μm, 1.424 to 1.5012 when said most frequent pore diameter of said through-holes is more than 0.3 μm and equal to or less than 0.6 μm, and 1.375 to 1.528 when said most frequent pore diameter of said through-holes is equal to or less than 0.3 μm.

### Claim 2 (depends on 1)

The transparent porous sustained-release body according to claim 1, wherein a most frequent pore diameter in a pore diameter distribution of said through-holes is 0.6 μm or less.

### Claim 3 (depends on 1)

The transparent porous sustained-release body according to claim 1, wherein a most frequent pore diameter in a pore diameter distribution of said through-holes is 0.3 μm or less.

### Claim 4 (depends on 1)

The transparent porous sustained-release body according to claim 1, wherein said inorganic compound is a silicon oxide composite mainly containing silica or silicon oxide.

### Claim 5 (depends on 1)

The transparent porous sustained-release body according to claim 1, wherein said sustained-release liquid is an essential oil having a refractive index within a range of 1.4 to 1.6, and the refractive index of the essential oil is the same relative to the refractive index of said skeleton body within said error range.