US4165418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paint manufacture
Assignee: Imperial Chemical Industries Ltd
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Filing: 1977-02-08
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Granted: 1979-08-21
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Expires: 1997-02-08
Abstract
Abstract A pigment dispersant suitable for use in making a series of paints, the dispersant being a copolymer of defined proportions of ethylenically unsaturated monomers containing hydroxy and/or amide groups, straight or branched chain alkyl groups of from 7 to 22 carbon atoms and optionally also groupings which can promote association of the copolymer with a pigment surface. A millbase made with the aid of such a dispersant can be combined in either loading or tinting operations with a wide range of different film-forming polymers.
Inventors
- 👤 Derek N. A. Speakman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:07
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/62; C09; C09D; C09D7/00; C09D7/40; C09D7/45
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
193 words
A pigment dispersant suitable for use in making a series of paints, the dispersant being a copolymer comprising units derived from the following ethylenically unsaturated monomers in the stated proportions by weight based on the total weight of the copolymer; (a) 0-50% of a hydroxy group containing monomer, and/or (b) 0-20% of an amide group containing monomer, provided that there is always present at least 5% of (a) or (b); 2- 80% of a monomer free from carboxyl groups and containing a straight or branched chain alkyl group of from 7 to 22 carbon atoms, and (d) a component containing one or more monomers free from the groups mentioned in (a), (b), or (c), said component including as an essential constituent up to 20% based on the total weight of the copolymer of a comonomer containing an epoxide group, said expoxide group having been reacted with a compound bearing a carboxyl group and a pigment dispersant group and having the formula ##STR3## OH where AR is an aromatic group and n is 1 or 0, the total amount of said component (d) being up to 50% and the total of monomers being 100%.
Claim 2
Dependent Claim
193 words
A pigment dispersant suitable for use in making a series of paints, the dispersant being a copolymer comprising units derived from the following ethylenically unsaturated monomers in the stated proportions by weight based on the total weight of the copolymer; (a) 0-50% of a hydroxy group containing monomer, and/or (b) 0-20% of an amide group containing monomer, provided that there is always present at least 5% of (a) or (b); 2- 80% of a monomer free from carboxyl groups and containing a straight or branched chain alkyl group of from 7 to 22 carbon atoms, and (d) a component containing one or more monomers free from the groups mentioned in (a), (b), or (c), said component including as an essential constituent up to 20% based on the total weight of the copolymer of a comonomer containing an epoxide group, said expoxide group having been reacted with a compound bearing a carboxyl group and a pigment dispersant group and having the formula ##STR3## OH where AR is an aromatic group and n is 1 or 0, the total amount of said component (d) being up to 50% and the total of monomers being 100%.
Claim 3
Dependent Claim
22 words
A dispersant copolymer as claimed in claim 1, comprising both a hydroxy group-containing monomer (a) and an amide group containing monomer (b).
Claim 4
Dependent Claim
28 words
A dispersant copolymer as claimed in claim 1 or claim 2, wherein the hydroxy group-containing monomer is selected from hydroxyethyl acrylate, hydroxyisopropyl acrylate, hydroxyethyl methacrylate and hydroxyisopropyl methacrylate.
Claim 5
Dependent Claim
22 words
A dispersant copolymer as claimed in claim 1 or claim 2, wherein the amide group-containing monomer is selected from acrylamide and methacrylamide.
Claim 6
Dependent Claim
35 words
A disperant copolymer as claimed in any one of claims 1 to 4, wherein the comonomer (c) is an alkyl acrylate or methacrylate in which the alkyl group contains from 7 to 22 carbon atoms.
Claim 7
Dependent Claim
41 words
A dispersant copolymer as claimed in any one of claims 1 to 5, wherein the comonomer (d) is selected from alkyl acrylates and methacrylates in which the alkyl group contains from 1 to 6 carbon atoms, styrene vinyl toluene and acrylonitrile.
Claim 8
Dependent Claim
53 words
A dispersant copolymer as claimed in claim 1 comprising: (a) 15-30% of a hydroxy alkyl methacrylate, or corresponding acrylate, e.g., where alkyl is ethyl, propyl, isopropyl or butyl, (b) 1-10% of acrylamide or methacrylamide, (c) 20-80% of C 7 or higher alkyl acrylate or methacrylate, and (d) 10-50% of styrene or vinyl toluene.
Claim 9
Dependent Claim
19 words
A dispersant copolymer as claimed in claim 1, wherein the compound is selected from p-aminobenzoic acid and p-nitrobenzoic acid.
Claim 10
Dependent Claim
171 words
A pigment dispersant suitable for use in making a series of paints, the dispersant being a copolymer comprising units derived from the following ethylenically unsaturated monomers in the stated proportions by weight based on the total weight of the copolymer: (a) 15-30% of a hydroxy alkyl methacrylate, or a corresponding acrylate, where the alkyl group is ethyl, propyl, isopropyl or butyl; (b) 1-10% of acrylamide or methacrylamide; (c) 20-80% of a higher alkyl acrylate or methacrylate in which the alkyl group contains not less than 7 carbon atoms; (d) a component consisting of styrene or vinyl toluene in admixture with up to 20%, based on the total weight of the copolymer, of a comonomer containing an epoxide group, said epoxide group having been reacted with a compound bearing a carboxyl group and a pigment dispersant group and having the formula ##STR4## where Ar is an aromatic group and n is 1 or 0, the total amount of said component (d) being up to 50% and the total of monomers being 100%.
Claim 11
Dependent Claim
171 words
A pigment dispersant suitable for use in making a series of paints, the dispersant being a copolymer comprising units derived from the following ethylenically unsaturated monomers in the stated proportions by weight based on the total weight of the copolymer: (a) 15-30% of a hydroxy alkyl methacrylate, or a corresponding acrylate, where the alkyl group is ethyl, propyl, isopropyl or butyl; (b) 1-10% of acrylamide or methacrylamide; (c) 20-80% of a higher alkyl acrylate or methacrylate in which the alkyl group contains not less than 7 carbon atoms; (d) a component consisting of styrene or vinyl toluene in admixture with up to 20%, based on the total weight of the copolymer, of a comonomer containing an epoxide group, said epoxide group having been reacted with a compound bearing a carboxyl group and a pigment dispersant group and having the formula ##STR4## where Ar is an aromatic group and n is 1 or 0, the total amount of said component (d) being up to 50% and the total of monomers being 100%.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-20 | 1983-02-19 | 1983-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-20 | 1987-02-19 | 1987-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-20 | 1991-02-19 | 1991-08-21 | $7700.00 | Window Closed / Lapsed |