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US4775420A
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Complex pigment compositions for coating of paper
Assignee: Coatex SAS
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Filing: 1987-03-30
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Granted: 1988-10-04
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Expires: 2007-03-30
Abstract
Abstract Complex pigment compositions for the coating of paper, comprising an aqueous phase, at least one pigment of mineral origin, a binding agent, optionally various customary additives, and a dispersing agent comprised of carboxyl-containing polymers which are water soluble and are converted to form salts. The polymers are obtained by known polymerization processes. The dispersing agent (a) has a specific viscosity (measured on the sodium salt) of between 0.25 and 2; and (b) is converted to the salt form to the extent of at least 60% by at least one salt-forming agent which has a polyvalent function. These complex pigment compositions have very low viscosities. They may also simultaneously contain diverse pigments, such as kaolin, titanium dioxode, and calcium carbonate, without suffering the usual increase in viscosity and the risk of setting.
Inventors
- 👤 Olivier Gonnet
- 👤 Jean Vallas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:26
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/56; D21H19/58
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
106 words
A complex pigment composition for the coating of paper, comprising a dispersion of: (i) an aqueous phase; (ii) at least one pigment of mineral origin; (iii) a binding agent; and (iv) a dispersing agent in an amount of 0.10-1.5 wt. % based on the weight of the dry pigment comprised of a corboxyl-containing polymer which is water soluble and converted to the salt form, wherein said dispersing agent has a specific viscosity of between 0.25 and 2.0, and wherein said dispersing agent is converted to the salt form to the extent of at least 60% by at least one salt-forming agent which has a polyvalent function.
Claim 2
Dependent Claim
106 words
A complex pigment composition for the coating of paper, comprising a dispersion of: (i) an aqueous phase; (ii) at least one pigment of mineral origin; (iii) a binding agent; and (iv) a dispersing agent in an amount of 0.10-1.5 wt. % based on the weight of the dry pigment comprised of a corboxyl-containing polymer which is water soluble and converted to the salt form, wherein said dispersing agent has a specific viscosity of between 0.25 and 2.0, and wherein said dispersing agent is converted to the salt form to the extent of at least 60% by at least one salt-forming agent which has a polyvalent function.
Claim 3
Dependent Claim
52 words
The pigment composition of claim 1, wherein said dispersing agent results from the polymerization or copolymerization of at least one monomer selected from the group consisting of (meth)acrylic acid, itaconic acid, crotonic acid, fumaric acid, maleic anhydride, isocrotonic acid, aconitic acid, mesaconic acid, sinapic acid, undecylenic acid, angelic acid, and hydroxyacrylic acid.
Claim 4
Dependent Claim
49 words
The pigment composition of claim 2, wherein said dispersing agent rsults from copolymerization of said monomer with at least one comonomer selected from the group consisting of acrolein, acrylamide, acrylonitrile, esters of (meth)crylic acid, imidazoles, vinylpyrrolidone, vinylcaprolactam, ethylene, propylene, isobutylene, diisobutylene, vinyl acetate, styrene, alpha-methylstyrene, and methyl vinyl ketone.
Claim 5
Dependent Claim
22 words
The pigment composition of claim 3, wherein said ester of (meth)acrylic acid is methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, or dimethylaminoethyl (meth)acrylate.
Claim 6
Dependent Claim
38 words
The pigment composition of claim 2, wherein said dispersing agent results from the polymerization or copolymerization of at least one monomer selected from the group consisting of (meth)acrylic acid, itaconic acid, crotonic acid, fumaric acid, and maleic anhydride.
Claim 7
Dependent Claim
19 words
The pigment composition of claim 1, wherein said dispersing agent has a specific viscosity of between 0.3 and 1.0.
Claim 8
Dependent Claim
21 words
The pigment composition of claim 1, wherein said salt-forming agent has a polyvalent function which is a divalent or trivalent cation.
Claim 9
Dependent Claim
27 words
The pigment composition of claim 7, wherein said cation is a member selected from the group consisting of calcium, magnesium, zinc, copper, lead, aluminum and chromium cations.
Claim 10
Dependent Claim
28 words
The pigment composition of claim 1, wherein the acid sites on said dispersing agent which are not converted to the salt form are preserved in the acid state.
Claim 11
Dependent Claim
37 words
The pigment composition of claim 9, wherein the acid sites of said dispersing agent which are not converted to the salt form are further converted to the salt form by a salt-forming agent having a monovalent function.
Claim 12
Dependent Claim
29 words
The pigment composition of claim 10, wherein said salt-forming agent having a monovalent function is selected from the group consisting of lithium, sodium, potassium, ammonium and quaternary amine cations.
Claim 13
Dependent Claim
19 words
The pigment composition of claim 1, wherein said dispersing agent is present in an amount of 0.15-1.0 wt. %.
Claim 14
Dependent Claim
34 words
The pigment composition of claim 1, wherein said pigment composition further comprises a binder or a water retention agent in an amount of 7-20 wt. % with respect to said pigment of mineral origin.
Claim 15
Dependent Claim
19 words
The pigment composition of claim 9, wherein said dispersing agent is present in the amount of 0.15-1.0 wt. %.
Claim 16
Dependent Claim
27 words
The pigment composition of claim 14, further comprising at least one additive selected from the group consisting of antifoaming agents, bluing agents, biocides, colorants, and alkaline hydroxides.
Claim 17
Dependent Claim
40 words
The pigment composition of claim 1, wherein said pigment of mineral origin is selected from the group consisting of kaolins, titanium oxides, talcs, natural or precipitated carbonates, aluminum hydroxides, the hydrated double sulfates of aluminum and calcium, and mixtures thereof.
Claim 18
Dependent Claim
29 words
The pigment composition of claim 1, wherein said binder or water retention agent is selected from the group consisting of starch, carboxymethylcellulose, polyvinyl alcohol, styrene-butadiene copolymers, and styrene-acrylate copolymers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |