# US 10,865,328 B2 · Room-temperature-curable silicone composition and electric/electronic apparatus

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- Number: US 10,865,328 B2
- Document ID: US10865328B2
- Status: Granted
- Kind: B2
- Application number: 16/485,879
- Filed: 2018-02-06
- Published: 2020-01-02
- Granted: 2020-12-15
- Earliest claimed: 2017-02-20
- Assignees: Dow Silicones Corporation
- Applicants: Dow Silicones Corporation
- Inventors: Jong-Ok Lim
- Web page: https://patentgrep.com/patent/US10865328B2

## CPC

- C09D 183/14: in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms (C09D183/10 takes precedence)
- C08G 77/08: characterised by the catalysts used
- C08G 77/14: containing silicon bound to oxygen-containing groups
- C08G 77/18: to alkoxy or aryloxy groups
- C08G 77/50: by carbon linkages
- C08K 5/5419: containing at least one Si—C bond
- C08K 5/57: Organo-tin compounds
- C08K 13/02: Organic and inorganic ingredients
- C08L 83/06: containing silicon bound to oxygen-containing groups (C08L83/12 takes precedence)
- C08L 83/14: in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms (C08L83/10 takes precedence)
- C09D 183/06: containing silicon bound to oxygen-containing groups (C09D183/12 takes precedence)
- C08L 2203/20: use in electrical or conductive gadgets
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A room-temperature-curable silicone composition is disclosed. The-room-temperature-curable silicone composition comprises: (A) an organopolysiloxane having alkoxysilyl-containing groups at both molecular terminals; (B) an organopolysiloxane resin; (C) an alkoxysilane; and (D) a condensation-reaction catalyst. The room-temperature-curable silicone composition exhibits good store stability and can form a cured product exhibiting high hardness and good thermal shock stability.

## Claims

### Claim 1

A room-temperature-curable silicone composition comprising:
(A) 100 parts by mass of an organopolysiloxane represented by the following general formula:
wherein each R1 is the same or different monovalent hydrocarbon group lacking an aliphatic unsaturated bond, each X is an alkoxysilyl-containing group represented by the following general formula:
wherein each R1 is as defined above, R2 is an alkyl group, each R3 is the same or different alkylene group, “a” is an integer from 0 to 2, and “n” is an integer from 1 to 20, and “m” is an integer from 50 to 1000;
(B) 50 to 200 parts by mass of an organopolysiloxane resin represented by the following average unit formula:
(R43SiO1/2)b(R42SiO2/2)c(R4SiO3/2)d(SiO4/2)e
wherein each R4 is the same or different monovalent hydrocarbon group, however, not more than 5 mol % of R4 in a molecule are aryl groups, and “b”, “c”, “d” and “e” are numbers satisfying the following conditions: 0≤b<0.2, 0.1≤c≤0.5, 0.4<d≤0.9, 0≤e<0.2, and b+c+d+e=1;
(C) 0.5 to 20 parts by mass of an alkoxysilane represented by the following general formula:
R5xSi(OR6)(4−x)
wherein R5 is a monovalent hydrocarbon group, R6 is an alkyl group, and “x” is an integer of from 0 to 2; and
(D) 0.1 to 20 parts by mass of a condensation-reaction catalyst.

### Claim 2 (depends on 1)

The room-temperature-curable silicone composition according to claim 1, wherein the alkoxysilyl-containing group in component (A) is a group represented by the following formula:

### Claim 3 (depends on 1)

The room-temperature-curable silicone composition according to claim 1, wherein component (B) is an organopolysiloxane resin represented by the following average unit formula:
[(CH3)2SiO2/2]c′(CH3SiO3/2)d′(C6H5SiO3/2)d″
wherein “c′”, “d′” and “d″” are numbers satisfying the following conditions: 0<c′<1,0<d′<1,0≤d″<1, and c′+d′+d″=1.

### Claim 4 (depends on 1)

The room-temperature-curable silicone composition according to claim 1, wherein component (C) is dimethyldimethoxysilane and/or methyltrimethoxysilane.

### Claim 5 (depends on 1)

The room-temperature-curable silicone composition according to claim 1, further comprising (E) a fluorescent whitening agent, in an amount of 0.001 to 0.1 parts by mass per 100 parts by mass of component (A).

### Claim 6 (depends on 1)

A conformal coating agent comprising the room-temperature-curable silicone composition according to claim 1.

### Claim 7 (depends on 1)

An electric/electronic apparatus obtained by using the room-temperature-curable silicone composition according to claim 1.

### Claim 8 (depends on 2)

The room-temperature-curable silicone composition according to claim 2, wherein component (B) is an organopolysiloxane resin represented by the following average unit formula:
[(CH3)2SiO2/2]c′(CH3SiO3/2)d′(C6H5SiO3/2)d″
wherein “c′”, “d′” and “d″” are numbers satisfying the following conditions: 0<c′<1,0<d′<1,0≤d″<1, and c′+d′+d″=1.

### Claim 9 (depends on 8)

The room-temperature-curable silicone composition according to claim 8, wherein component (C) is dimethyldimethoxysilane and/or methyltrimethoxysilane.

### Claim 10 (depends on 9)

The room-temperature-curable silicone composition according to claim 9, further comprising (E) a fluorescent whitening agent, in an amount of 0.001 to 0.1 parts by mass per 100 parts by mass of component (A).