US 4,060,511 A · Pigmented, particulate powder coating composition

Abstract

A free-flowing, homogeneous, polymer-coated pigment, particulate powder coating composition is obtained in preparing a coating composition involving catalytic polymerization of at least one ethylenically unsaturated monomer in a nonaqueous aliphatic hydrocarbon solvent for said monomer and in the presence of a dispersion stabilizer having a polymeric segment solvated by said solvent and another segment relatively non-solvated by the solvent and associated with polymer particles which are formed upon said polymerization of said monomer and which are insoluble in said solvent for providing a nonaqueous dispersion of said polymer particles, through a sequence of steps including: I. preparing said dispersion stabilizer in a solution containing a coalescing solvent which is an active solvent for said polymer particles; Ii. admixing a portion of the product of (i) with said pigment to form a pigment dispersion; Iii. drying another portion of the product of (i); Iv. admixing the products of (ii) and (iii) in said nonaqueous aliphatic hydrocarbon solvent so that the resulting mixture contains not more than 6000 parts per million of the coalescing solvent with a then adding of said monomer and a carrying forth therein of the catalytic polymerization of at least one ethylenically unsaturated monomer; V. cooling a resulting polymerizate of (iv); and Vi. drying the cooled polymerizate of (v) to provide the free-flowing, homogeneous, polymer-coated pigment, particulate powder coating composition.

Claims23

Dependent claims

In preparing a coating composition involving catalytic polymerization of at least one ethylenically unsaturated monomer in a nonaqueous aliphatic hydrocarbon solvent for said monomer and in the presence of a pigment insoluble in said solvent and in the presence of a dispersion stabilizer having a polymeric segment solvated by said solvent and another segment relatively non-solvated by said solvent and associated with polymer particles which are formed upon said polymerization of said monomer and which are insoluble in said solvent for providing a non-aqueous dispersion of said polymer particles, the improvement of preparing a free-flowing, homogeneous, polymer-coated pigment, particulate powder coating composition through a sequence of steps including:

i. preparing said dispersion stabilizer in a solution containing a coalescing solvent which is an active solvent for said polymer particles;
ii. admixing a portion of the product of (i) with said pigment to form a pigment dispersion;
iii. drying another portion of the product of (i);
iv. admixing the products of (ii) and (iii) in said nonaqueous aliphatic hydrocarbon solvent so that the resulting mixture contains not more than 6000 parts per million by weight of the coalescing solvent with a then adding of said monomer and a carrying forth therein of the catalytic polymerization of at least one ethylenically unsaturated monomer;
v. cooling a resulting polymerizate of (iv);
and
vi. drying the cooled polymerizate of (v) to provide the free-flowing, homogeneous, polymer-coated pigment, particulate powder coating composition.

4 more elements

A process for producing a free-flowing, homogeneous, polymer-coated pigment, particulate powder coating composition which comprises:

a. condensing a monomer of a monohydroxylic monocarboxylic acid and an ethylenically unsaturated monomer to form an adduct,
b. copolymerizing the adduct obtained in (a) and at least one ethylenically unsaturated monomer to form a "Stabilizer A" solution,
c. reacting "Stabilizer A" solution obtained in (b) with a polymerizable ethylenically unsaturated acid to form a dispersion "Stabilizer B" solution,
d. admixing one portion of "Stabilizer B" solution obtained in (c) with a pigment under conditions to form dispersed pigment particles having sizes within the range of 10 to 50 microns in "Stabilizer B" solution,
e. drying another portion of "Stabilizer B"solution obtained in (c) under conditions to remove substantially all of the volatile matter from "Stabilizer B" solution and to form a dried dispersion "Stabilizer B",
f. dissolving dried dispersion "Stabilizer B" obtained in (e) and a polymerizing catalytic amount of a free-radical catalyst in at least one ethylenically unsaturated monomer to form an initiator-monomer-stabilizer solution,
g. admixing the initiator-monomer-stabilizer solution obtained in (f) with dispersed pigment particles obtained in (d) so that the resulting polymerizable mixture contains not more than 6000 parts per million by weight of a coalescing solvent,
h. copolymerizing the admixture obtained in (g) to produce a polymerizate comprising a dispersion of polymer-coated pigment particles,
i. cooling the polymerization mass obtained in (h) to a temperature below about 80.degree. C. and
j. drying the cooled polymerization mass obtained in (i) to form a free-flowing, homogeneous, polymer-coated pigment, particulate powder coating composition.

7 more elements

A free-flowing, homogeneous, polymer-coated pigment, particulate powder coating composition, said composition being obtained by

a. condensing a monomer of a monohydroxylic monocarboxylic acid and an ethylenically unsaturated monomer to form an adduct,
b. copolymerizing the adduct obtained in (a) and at least one ethylenically unsaturated monomer to form a "Stabilizer A" solution,
c. reacting "Stabilizer A" solution obtained in (b) with a polymerizable ethylenically unsaturated acid to form a dispersion "Stabilizer B" solution,
d. admixing one portion of "Stabilizer B" solution obtained in (c) with a pigment under conditions to form dispersed pigment particles having sizes within the range of 10 to 50 microns in "Stabilizer B" solution,
e. drying another portion of "Stabilizer B" solution obtained in (c) under conditions to remove substantially all of the volatile matter from "Stabilizer B" solution and to form a dried dispersion "Stabilizer B",
f. dissolving dried dispersion "Stabilizer B" obtained in (e) and a polymerizing catalytic amount of a free-radical catalyst in at least one ethylenically unsaturated monomer to form an initiator-monomer-stabilizer solution,
g. admixing the initiator-monomer-stabilizer solution obtained in (f) with dispersed pigment particles obtained in (d) so that the resulting polymerizable mixture contains not more than 6000 parts per million by weight of a coalescing solvent,
h. copolymerizing the admixture obtained in (g) to produce a polymerizate comprising a dispersion of polymer-coated pigment particles.
i. cooling the polymerization mass obtained in (h) to a temperature below about 80.degree. C. and
j. drying the cooled polymerization mass obtained in (i) to form a free-flowing, homogeneous, polymer-coated pigment, particulate powder coating composition.

7 more elements

Dependencies are inferred from the claim text.

Pigmented, particulate powder coating composition

Life of this patent

Pigmented, particulate powder coating composition

Life of this patent

Abstract

Claims23