US4466832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for forming hydrophilic coating
Assignee: Daikin Industries Ltd
•
Filing: 1982-09-29
•
Granted: 1984-08-21
•
Expires: 2002-09-29
Abstract
Abstract A composition which comprises a mixture of: (a) an alkali metal silicate having an SiO2/M2O mole ratio of 2 to 5, (b) a hydrophilic silicic acid or silicate in the form of fine particles, and (c) a silane coupling agent, or an ortho-acid ester of a transition element in Group IV of the Periodic Table or a derivative of the ester forms hydrophilic coatings which are outstanding in durability, corrosion resistance and adhesion.
Inventors
- 👤 Tatsushiro Yoshimura
- 👤 Takeaki Nakazima
- 👤 Hiromasa Yokoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:10
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73; C23C22/74; C04; C04B; C04B24/00; C04B24/40; C04B28/00; C04B28/24; C04B28/26; C04B2111/00; C04B2111/00474; C04B2111/00482; C23C2222/00; C23C2222/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
81 words
A composition for forming hydrophilic coatings which comprise a mixture of: (a) an alkali metal silicate having a SiO 2 /M 2 O mole ratio of 2 to 5 and a particle size of about 0.5 to about 2μ, (b) a hydrophilic silicic acid or silicate in the form of fine particles of about 3 to about 30 mμ, and (c) an ortho-acid ester of a transition element in Group IV of the Periodic Table or a derivative of the ester.
Claim 2
Dependent Claim
81 words
A composition for forming hydrophilic coatings which comprise a mixture of: (a) an alkali metal silicate having a SiO 2 /M 2 O mole ratio of 2 to 5 and a particle size of about 0.5 to about 2μ, (b) a hydrophilic silicic acid or silicate in the form of fine particles of about 3 to about 30 mμ, and (c) an ortho-acid ester of a transition element in Group IV of the Periodic Table or a derivative of the ester.
Claim 3
Dependent Claim
20 words
A composition as defined in claim 1 wherein the alkali metal silicate is lithium silicate, sodium silicate or potassium silicate.
Claim 4
Dependent Claim
15 words
A composition as defined in claim 2 wherein the alkali metal silicate is lithium silicate.
Claim 5
Dependent Claim
25 words
A composition as defined in claim 1 wherein the hydrophilic silicic acid is a dispersion or colloid solution of silicic acid or silicic acid anhydride.
Claim 6
Dependent Claim
16 words
A composition as defined in claim 4 wherein the hydrophilic silicic acid is a colloidal silica.
Claim 7
Dependent Claim
23 words
A composition as defined in claim 1 wherein the silicate is kaolin, clay, talc, bentonite, calcium silicate, aluminum silicate, kieselguhr, asbestos or zeolite.
Claim 8
Dependent Claim
64 words
A composition as defined in claim 1 wherein the ortho-acid esters of transition elements (T) in Group IV of the Periodic Table or derivatives thereof are compounds represented by the formula T(OR) 4 or derivatives prepared by reacting such compounds with at least one compound having at least one functional group, R being alkyl, cycloalkyl or aryl each having 1 to 10 carbon atoms.
Claim 9
Dependent Claim
18 words
A composition as defined in claim 7 wherein the transition element (T) is titanium, zirconium, hafnium or thorium.
Claim 10
Dependent Claim
33 words
A composition as defined in claim 7 wherein the ortho-acid ester or derivative thereof is tetrabutyl titanate, triethanolamine titanate, titanium acetylacetonate or zirconium, hafnium and thorium compound corresponding to the above titanium compound.
Claim 11
Dependent Claim
61 words
A composition as defined in claim 1 wherein the components (a) to (c) are used in the following proportions by weight calculated as solids: 100 parts of the alkali metal silicate (a), about 0.5 to about 50 parts of the hydrophilic silicic acid or silicate (b), and about 0.1 to about 10 parts of the ortho-acid ester or derivative thereof (c).
Claim 12
Dependent Claim
19 words
A composition as defined in claim 1 wherein the solids concentration is about 5 to about 20% by weight.
Claim 13
Dependent Claim
9 words
An article coated with a composition of claim 1.
Claim 14
Dependent Claim
18 words
An article as defined in claim 12 wherein the articles are fins and pipes of a heat exchanger.
Claim 15
Dependent Claim
13 words
An air conditioning apparatus having incorporated a heat exchanger obtained in claim 13.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |