US4057525A
Expired / Lapsed
US
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Methods for preparing stable silica sols and inorganic coating compositions
Assignee: Kowa Chemical Industry Co Ltd
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Filing: 1976-03-15
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Granted: 1977-11-08
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Expires: 1996-03-15
Abstract
Abstract A novel stable silica sol which does not gel even at low temperatures is prepared by adding a di -or polyhydric alcohol having three or more carbon atoms and a water-soluble melamine resin to a silica sol. A novel water-based coating composition which requires only an applying step, not a baking step nor a drying step, in the use is prepared by adding an aggregate or filler and usual additives for coating material to the aforesaid stable silica sol as binder. By adding further a small amount of a synthetic resin emulsion to said binder, an inorganic coating composition containing a smaller amount of organic materials than that in prior products can be obtained. The coating therefrom is excellent in strength and its fire resistance is not lowered.
Inventors
- 👤 Kiyoshi Kikuchi
- 👤 Takeo Okano
- 👤 Yukio Terakawa
- 👤 Akira Nishihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:03
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/145; C09; C09D; C09D5/00; C09D5/18; C04B2111/00; C04B2111/00474; C04B2111/00482; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31859; Y10T428/31862; Y10T428/31942; Y10T428/31949; Y10T428/31957
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
63 words
Method for producing an inorganic coating composition which comprises forming a binder component consisting of a stable silica sol and incorporating said binder into said inorganic coating composition, said stable silica sol being prepared by adding at least one dihydric long chain alcohol having 3 or more carbon atoms to a silica sol, and adding a water-soluble melamine resin to the resultant sol.
Claim 2
Dependent Claim
63 words
Method for producing an inorganic coating composition which comprises forming a binder component consisting of a stable silica sol and incorporating said binder into said inorganic coating composition, said stable silica sol being prepared by adding at least one dihydric long chain alcohol having 3 or more carbon atoms to a silica sol, and adding a water-soluble melamine resin to the resultant sol.
Claim 3
Dependent Claim
94 words
An inorganic coating composition consisting essentially of a stable silica sol, as binder, which is prepared by adding at least one dihydric long chain alcohol having at least 3 carbon atoms, a small amount of a water-soluble melamine resin and an acrylic resin emulsion, to a silica sol having a silica content of about 30% by weight; a mixture of pigment, aggregate and filler in a quantity corresponding to a weight ratio of said silica sol to said mixture of 1 : 2-20; usual additives for coating material in a suitable quantity; and water.
Claim 4
Dependent Claim
94 words
An inorganic coating composition consisting essentially of a stable silica sol, as binder, which is prepared by adding at least one dihydric long chain alcohol having at least 3 carbon atoms, a small amount of a water-soluble melamine resin and an acrylic resin emulsion, to a silica sol having a silica content of about 30% by weight; a mixture of pigment, aggregate and filler in a quantity corresponding to a weight ratio of said silica sol to said mixture of 1 : 2-20; usual additives for coating material in a suitable quantity; and water.
Claim 5
Dependent Claim
109 words
The composition of claim 2, in which said dihydric long chain alcohol having at least 3 carbon atoms is used in a quantity of at least 5 parts by weight per 100 parts by weight of said silica sol having a silica content of about 30% by weight, said water-soluble melamine resin is used in a quantity of at least 2 parts by weight per 100 parts by weight of said silica sol, and said acrylic resin emulsion has the resin content of about 30% by weight and is used in a quantity of 10 - 35 parts by weight per 100 parts by weight of said silica sol.
Claim 6
Dependent Claim
32 words
The method of claim 1, in which said dihydric long chain alcohol having at least 3 carbon atoms is selected from the group consisting of propylene glycol, trimethylene glycol and triethylene glycol.
Claim 7
Dependent Claim
32 words
The composition of claim 3, in which said dihydric long chain alcohol having at least 3 carbon atoms is selected from the group consisting of propylene glycol, trimethylene glycol and triethylene glycol.
Claim 8
Dependent Claim
59 words
The method of claim 1, in which said water-soluble melamine resin is a methyl-etherified product of melamine-formaldehyde precondensate which is prepared by a process wherein melamine is reacted at a low temperature under alkaline conditions with formaldehyde to obtain a methylol derivative of high methylol content, and then said methylol derivative is etherified under weak acidic condition with methanol.
Claim 9
Dependent Claim
58 words
The composition of claim 3, in which said water-soluble melamine resin is a methyl-etherified product of melamine-formaldehyde precondensate which is prepared by a process wherein melamine is reacted at low temperature under alkaline conditions with formaldehyde to obtain a methylol derivative of high methylol content, and then said methylol derivative is etherified under weak acidic condition with methanol.
Claim 10
Dependent Claim
53 words
The composition of claim 3, in which said acrylic resin emulsion is an emulsion of an acrylic resin which is prepared by emulsion-polymerizing, as main monomer, one or more kinds of monomer selected from the group consisting of acrylic acid, methacrylic acid,, fumaric acid, crotonic acid, itaconic acid and esters of these acids.
Claim 11
Dependent Claim
73 words
Method for preparing a stable silica sol which comprises providing 100 parts by weight of a silica sol having a silica content of about 30% by weight, adding thereto at least one dihydric long chain alcohol having at least 3 carbon atoms in a quantity of at least 5 parts by weight, and further adding a water-soluble melamine resin in a quantity of at least 2 parts by weight to the resulted sol.
Claim 12
Dependent Claim
73 words
Method for preparing a stable silica sol which comprises providing 100 parts by weight of a silica sol having a silica content of about 30% by weight, adding thereto at least one dihydric long chain alcohol having at least 3 carbon atoms in a quantity of at least 5 parts by weight, and further adding a water-soluble melamine resin in a quantity of at least 2 parts by weight to the resulted sol.
Claim 13
Dependent Claim
32 words
The method of claim 9, in which said dihydric long chain alcohol having at least 3 carbon atoms is selected from the group consisting of propylene glycol, trimethylene glycol and triethylene glycol.
Claim 14
Dependent Claim
58 words
The method of claim 9, in which said water-soluble melamine resin is a methyl-etherified product of melamine-formaldehyde precondensate which is prepared by a process wherein melamine is reacted at low temperature under alkaline condition with formaldehyde to obtain a methylol derivative of high methylol content, and then said methylol derivative is etherified under weak acidic condition with methanol.
Claim 15
Dependent Claim
96 words
Method for preparing a stable silica sol which comprises providing 100 parts by weight of a silica sol having a silica content of about 30% by weight, adding thereto at least one dihydric long chain alcohol having at least 3 carbon atoms in a quantity of at least 5 parts by weight, and further adding a water-soluble melamine resin in a quantity of at least 2 parts by weight, together with an acrylic resin emulsion having a resin content of about 30% by weight in a quantity of 10-35 parts by weight, to the resultant sol.
Claim 16
Dependent Claim
96 words
Method for preparing a stable silica sol which comprises providing 100 parts by weight of a silica sol having a silica content of about 30% by weight, adding thereto at least one dihydric long chain alcohol having at least 3 carbon atoms in a quantity of at least 5 parts by weight, and further adding a water-soluble melamine resin in a quantity of at least 2 parts by weight, together with an acrylic resin emulsion having a resin content of about 30% by weight in a quantity of 10-35 parts by weight, to the resultant sol.
Claim 17
Dependent Claim
32 words
The method of claim 12, in which said dihydric long chain alcohol having at least 3 carbon atoms is selected from the group consisting of propylene glycol, trimethylene glycol and triethylene glycol.
Claim 18
Dependent Claim
59 words
The method of claim 12, in which said water-soluble melamine resin is a methyl-etherified product of melamine-formaldehyde precondensate which is prepared by a process wherein melamine is reacted at a low temperature under alkaline conditions with formaldehyde to obtain a methylol derivative of high methylol content, and then said methylol derivative is etherified under weak acidic conditions with methanol.
Claim 19
Dependent Claim
55 words
The method of claim 12, in which said acrylic resin emulsion consists essentially of an emulsion of an acrylic resin which is prepared by emulsion-polymerizing, as main monomer, at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, fumaric acid, crotonic acid maleic acid, itaconic acid and esters of these acids.
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) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |