Water-repellant transparent coating-substrate assembly and process for producing the same
US-9856407-B2 · Jan 2, 2018 · US
Water repellent film-forming composition and water repellent film
US11118072B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11118072-B2 |
| Application number | US-201916380700-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 10, 2019 |
| Priority date | Apr 11, 2018 |
| Publication date | Sep 14, 2021 |
| Grant date | Sep 14, 2021 |
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Abstract
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A composition is provided comprising (a) a polysilazane having a monovalent hydrocarbon group, (b) untreated metal oxide nanoparticles, metal oxide nanoparticles having a monovalent hydrocarbon group, or metal oxide nanoparticles having an alkylsilyl or alkoxysilyl group, and (c) an aprotic solvent. The composition has storage stability and is suitable for forming a film having water repellent, especially superhydrophobic properties.
First claim
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The invention claimed is: 1. A water repellent film-forming composition comprising: (a) a polysilazane having an optionally fluorinated C 3 -C 20 monovalent hydrocarbon group bonded to a silicon atom, (b) untreated metal oxide nanoparticles, metal oxide nanoparticles having an optionally fluorinated C 1 -C 20 monovalent hydrocarbon group on their surface, or metal oxide nanoparticles having an alkylsilyl or alkoxysilyl group on their surface, and (c) an aprotic solvent, wherein component (a) is a polysilazane having the general formula (1): [RSi(NH) 1.5 ] m [R a 2 Si(NH) 1.0 ] n [R b 3 Si(NH) 0.5 ] p (1) wherein R is each independently an optionally fluorinated C 3 -C 20 monovalent hydrocarbon group, R a and R b are each independently an optionally fluorinated C 1 -C 20 monovalent hydrocarbon group, m is an integer of 1 to 100, n and p are each independently an integer of 0 to 100, and the sum of m, n and p is an integer of 4 to 300. 2. The composition of claim 1 wherein the metal oxide nanoparticles (b) have been surface treated with the polysilazane having formula (1) so that the nanoparticles have an optionally fluorinated C 3 -C 20 monovalent hydrocarbon group via a silicon atom on their surface. 3. The composition of claim 1 wherein the metal oxide nanoparticles (b) are of silica. 4. A water repellent film comprising: (a) a polysilazane having an optionally fluorinated C 3 -C 20 monovalent hydrocarbon group bonded to a silicon atom, and (b) untreated metal oxide nanoparticles, metal oxide nanoparticles having an optionally fluorinated C 1 -C 20 monovalent hydrocarbon group on their surface, or metal oxide nanoparticles having an alkylsilyl or alkoxysilyl group on their surface, wherein component (a) is a polysilazane having the general formula (1): [RSi(NH) 1.5 ] m [R a 2 Si(NH) 1.0 ] n [R b 3 Si(NH) 0.5 ] p (1) wherein R is each independently an optionally fluorinated C 3 -C 20 monovalent hydrocarbon group, R a and R b are each independently an optionally fluorinated C 1 -C 20 monovalent hydrocarbon group, m is an integer of 1 to 100, n and p are each independently an integer of 0 to 100, and the sum of m, n and p is an integer of 4 to 300.
Assignees
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Classifications
halogen-containing groups · CPC title
- C08K3/36Primary
Silica · CPC title
Nanostructured additives · CPC title
in which all the silicon atoms are connected by linkages other than oxygen atoms · CPC title
Particle size smaller than 100 nm · CPC title
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- What does patent US11118072B2 cover?
- A composition is provided comprising (a) a polysilazane having a monovalent hydrocarbon group, (b) untreated metal oxide nanoparticles, metal oxide nanoparticles having a monovalent hydrocarbon group, or metal oxide nanoparticles having an alkylsilyl or alkoxysilyl group, and (c) an aprotic solvent. The composition has storage stability and is suitable for forming a film having water repellent,…
- Who is the assignee on this patent?
- Shinetsu Chemical Co
- What technology area does this patent fall under?
- Primary CPC classification C08K3/36. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Sep 14 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).