US4243430A — Pigment dispersant for aqueous paints

Claim 1

Independent Claim 113 words

A pigment paste, adapted for use in a wide variety of aqueous latex paints, comprising a water-compatible suspension of a finely divided pigment and, for dispersion thereof, an effective amount of a water soluble dispersant comprising (1) an addition copolymer of greater than about 30 % by weight of an α; β-unsaturated monovinylidene carboxylic acid or a mixture of such acids and (2) at least one other ethylenically unsaturated monomer, the copolymer having an apparent pKa between 6.0 and 7.5 and a number average molecular weight between about 500 and about 15,000; the copolymer being characterized by forming a water soluble salt with a zinc ammonia complex ion at a pH of 9.6.

Claim 2

Dependent Claim 113 words

A pigment paste, adapted for use in a wide variety of aqueous latex paints, comprising a water-compatible suspension of a finely divided pigment and, for dispersion thereof, an effective amount of a water soluble dispersant comprising (1) an addition copolymer of greater than about 30 % by weight of an α; β-unsaturated monovinylidene carboxylic acid or a mixture of such acids and (2) at least one other ethylenically unsaturated monomer, the copolymer having an apparent pKa between 6.0 and 7.5 and a number average molecular weight between about 500 and about 15,000; the copolymer being characterized by forming a water soluble salt with a zinc ammonia complex ion at a pH of 9.6.

Claim 3

Dependent Claim 44 words

The paste of claim 1 in which the number average molecular weight of the copolymer is between 1,000 and 6,000, the apparent pKa is between 6.3 and 7.2 and the amount of the copolymer is 0.01% to 10% on the weight of the pigment.

Claim 4

Dependent Claim 54 words

The paste of claim 2 in which the copolymer is a copolymer of 30 to 70% by weight of the carboxylic acid and at least 30% by weight of a hydrocarbon monomer, a C 1 -C 18 ester of acrylic acid, a C 1 -C 18 ester of methacrylic acid or a mixture thereof.

Claim 5

Dependent Claim 45 words

The paste of claim 3 wherein the pKa is between 6.5 and 7.0, the number average molecular weight is between 2,000 and 4,000 and the copolymer is a copolymer of 30 to 50% by weight of acrylic, methacrylic or itaconic acids or a mixture thereof.

Claim 6

Dependent Claim 54 words

The paste of claim 4 wherein the copolymer is 0.5% to 7% by weight of the pigment and comprises 50 to 70% by weight of C 1 -C 8 alkyl methacrylate mer units, C 1 -C 8 alkyl acrylate mer units or a mixture thereof and wherein the pigment comprises a multivalent metal compound.

Claim 7

Dependent Claim 64 words

The paste of claim 5 wherein the copolymer is 1% to 5% of the weight of the pigment and comprises 35 to 40% by weight methacrylic acid mer units and 60 to 65% by weight of C 2 -C 4 alkyl methacrylate mer units, C 2 -C 4 alkyl acrylate mer units or a mixture thereof and wherein the metal compound is zinc oxide.

Claim 8

Dependent Claim 141 words

A process for preparing a pigment paste comprising adding to a vessel paste components comprising (A) water, (B) a pigment, (C) about 0.01% to about 10%, on the weight of the pigment, of a water soluble dispersant comprising (1) an addition copolymer of greater than about 30% by weight of an α, β-unsaturated monovinylidene carboxylic acid or a mixture of such acids and (2) at least one other ethylenically unsaturated monomer, the copolymer having an apparent pKa between 6.0 and 7.5 and a number average molecular weight between about 500 and about 15,000; the copolymer being characterized by forming a water soluble salt with a zinc ammonia complex ion at a pH 9.6; and, optionally, (D) a wetting agent, an antifoam agent, a solvent, a thickener or any combination thereof and grinding the components under high shear to form a paste.

Claim 9

Dependent Claim 141 words

A process for preparing a pigment paste comprising adding to a vessel paste components comprising (A) water, (B) a pigment, (C) about 0.01% to about 10%, on the weight of the pigment, of a water soluble dispersant comprising (1) an addition copolymer of greater than about 30% by weight of an α, β-unsaturated monovinylidene carboxylic acid or a mixture of such acids and (2) at least one other ethylenically unsaturated monomer, the copolymer having an apparent pKa between 6.0 and 7.5 and a number average molecular weight between about 500 and about 15,000; the copolymer being characterized by forming a water soluble salt with a zinc ammonia complex ion at a pH 9.6; and, optionally, (D) a wetting agent, an antifoam agent, a solvent, a thickener or any combination thereof and grinding the components under high shear to form a paste.

Claim 10

Dependent Claim 9 words

The paste prepared by the process of claim 7.

Claim 11

Dependent Claim 82 words

A water-soluble dispersant copolymer, adapted for use in pigment paste, consisting of (1) at least about 30% by weight of an α,β-unsaturated monovinylidene carboxylic acid or a mixture of such acids and (2) at least one other ethylenically unsaturated monomer, the copolymer having an apparent pKa between 6.0 and 7.5 and a number average molecular weight between about 500 and about 15,000; the copolymer being characterized by forming a water-soluble salt with a zinc ammonia complex ion at a pH of 9.6.

Claim 12

Dependent Claim 82 words

A water-soluble dispersant copolymer, adapted for use in pigment paste, consisting of (1) at least about 30% by weight of an α,β-unsaturated monovinylidene carboxylic acid or a mixture of such acids and (2) at least one other ethylenically unsaturated monomer, the copolymer having an apparent pKa between 6.0 and 7.5 and a number average molecular weight between about 500 and about 15,000; the copolymer being characterized by forming a water-soluble salt with a zinc ammonia complex ion at a pH of 9.6.

Claim 13

Dependent Claim 26 words

The copolymer of claim 9 in which the number average molecular weight is between 1,000 and 6,000 and the apparent pKa is between 6.3 and 7.2.

Claim 14

Dependent Claim 54 words

The copolymer of claim 10 comprising 25 to 70% by weight of α,β-unsaturated monovinylidene carboxylic acid mer units and at least 30% by weight of mer units derived from a hydrocarbon monomer, a C 1 -C 18 ester of acrylic acid, a C 1 -C 18 ester of methacrylic acid or a mixture thereof.

Claim 15

Dependent Claim 41 words

The copolymer of claim 11 having a pKa between 6.5 and 7.0, a number average molecular weight between 2,000 and 4,000 and being a copolymer of 30 to 50% by weight of acrylic, methacrylic or itaconic acids or a mixture thereof.

Claim 16

Dependent Claim 48 words

The copolymer of claim 12 wherein the copolymer is 0.5% to 7% by weight of the pigment and is a copolymer of 50 to 70% by weight of C 1 -C 8 alkyl methacrylate mer units, C 1 -C 8 alkyl acrylate mer units or a mixture thereof.

Claim 17

Dependent Claim 56 words

The copolymer of claim 13 wherein the copolymer is 1% to 5% of the weight of the pigment and comprises 35 to 40% by weight methacrylic acid mer units and 60 to 65% by weight of C 2 -C 4 alkyl methacrylate mer units, C 2 -C 4 alkyl acrylate mer units or a mixture thereof.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1984-01-06	1984-07-07	1985-01-06	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1988-01-06	1988-07-07	1989-01-06	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1992-01-06	1992-07-07	1993-01-06	$7700.00	Window Closed / Lapsed

Pigment dispersant for aqueous paints

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