US4013615A
Expired / Lapsed
US
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Electrostatic spray coating powder pigment composition and process for producing the same
Assignee: Tekkosha Co Ltd
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Filing: 1974-09-10
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Granted: 1977-03-22
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Expires: 1994-09-10
Abstract
Abstract A vinyl monomer alone, or a mixture of a vinyl monomer and at least one comonomer copolymerizable with said vinyl monomer and having a faster rate of polymerization than the rate of polymerization of the viny monomer, is emulsion-polymerized in an aqueous medium in the presence of a surface active agent and a pigment and, if required, other additives, under vigorous stirring. The polymer particles are substantially spherical. They do not contain interconnected pigment particles on the surface thereof but rather the pigment particles are substantially uniformly distributed in the interior of the polymer particles. There is obtained a powder composition adapted for electrostatic spray coating. When an agent for preventing thermal cracking is added to the emulsion polymerization reaction mixture after the completion of polymerization, there is obtained an electrostatic spray coating powder paint composition which does not become deteriorated if the coating film is heated at high fusing temperatures.
Inventors
- 👤 Koichi Ohashi
- 👤 Yuzi Takahasi
- 👤 Takashi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:50
CPC Classifications
C; C09; C09D; C09D157/00; C09D157/06; C08; C08F; C08F2/00; C08F2/44; Y; Y10; Y10S; Y10S524/00; Y10S524/901; Y10S524/902; Y10S524/904
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
65 words
A process for preparing powder compositions suitable for dry electrostatic spray coating, comprising the steps of emulsion polymerizing a reaction mixture of 1. first monomer component selected from the group consisting of vinyl chloride, monomer having the formula ##STR2## wherein R 1 is hydrogen or methyl and R 2 is a hydrocarbon group having 1 to 18 carbon atoms, and mixtures of said monomers, 2.
Claim 2
Dependent Claim
65 words
A process for preparing powder compositions suitable for dry electrostatic spray coating, comprising the steps of emulsion polymerizing a reaction mixture of 1. first monomer component selected from the group consisting of vinyl chloride, monomer having the formula ##STR2## wherein R 1 is hydrogen or methyl and R 2 is a hydrocarbon group having 1 to 18 carbon atoms, and mixtures of said monomers, 2.
Claim 3
Dependent Claim
223 words
from 0 to 185 parts by weight, per 100 parts by weight of monomer component (1), of at least one comonomer copolymerizable with monomer component (1) and having a faster rate of polymerization than monomer component (1), 3. from 0.1 to 50 weight percent, based on the sum of components (1) and (2), of a water-insoluble pigment, 4. from 3 to 20 weight percent, based on the sum of components (1) and (2), of a water-soluble organic surfactant, 5. a water-soluble polymerization initiator in an amount effective to cause polymerization of components (1) and (2), and 6. from about 200 to about 400 weight percent, based on the sum of components (1) and (2), of an aqueous liquid medium while simultaneously vigorously agitating the reaction mixture throughout the polymerization so that the circulation number per minute of the reaction mixture is at least 3, wherein the circulation number per minute is equal to the integrated volume of the circulating flow of the reaction mixture per minute divided by the total volume of reaction mixture, in the polymerization vessel to produce substantially spherical polymer particles having a particle size within the range of about 30 to 250 microns, a bulk density of greater than 0.3 and a volume intrinsic resistivity of at least 10 9 ohm-cm; separating the solid polymer particles from the agueous
Claim 4
Dependent Claim
223 words
from 0 to 185 parts by weight, per 100 parts by weight of monomer component (1), of at least one comonomer copolymerizable with monomer component (1) and having a faster rate of polymerization than monomer component (1), 3. from 0.1 to 50 weight percent, based on the sum of components (1) and (2), of a water-insoluble pigment, 4. from 3 to 20 weight percent, based on the sum of components (1) and (2), of a water-soluble organic surfactant, 5. a water-soluble polymerization initiator in an amount effective to cause polymerization of components (1) and (2), and 6. from about 200 to about 400 weight percent, based on the sum of components (1) and (2), of an aqueous liquid medium while simultaneously vigorously agitating the reaction mixture throughout the polymerization so that the circulation number per minute of the reaction mixture is at least 3, wherein the circulation number per minute is equal to the integrated volume of the circulating flow of the reaction mixture per minute divided by the total volume of reaction mixture, in the polymerization vessel to produce substantially spherical polymer particles having a particle size within the range of about 30 to 250 microns, a bulk density of greater than 0.3 and a volume intrinsic resistivity of at least 10 9 ohm-cm; separating the solid polymer particles from the agueous
Claim 5
Dependent Claim
26 words
medium and drying the polymer particles. 2. A process as claimed in claim 1, in which the circulation number per minute is from 5 to 30.
Claim 6
Dependent Claim
43 words
A process as claimed in claim 1, in which the reaction mixture contains at least one additive selected from the group consisting of plastic flow improving agents, stabilizers, ultraviolet ray absorbing agents, thermal stability improving agents, molecular weight adjusting agents and curing agents.
Claim 7
Dependent Claim
47 words
A process as claimed in claim 1, in which after the emulsion polymerization is completed and before the solid polymer is removed from the aqueous medium, a thermal decomposition preventing agent is added to the reaction system to be absorbed on the surfaces of the polymer particles.
Claim 8
Dependent Claim
61 words
A process as claimed in claim 1, in which said monomer component (1) consists essentially of vinyl chloride, the reaction mixture contains from 0.1 to 15 percent by weight, based on the combined weights of components (1) and (2), of a stabilizer for polymers containing vinyl chloride units, and the degree of polymerization of the polymer is from 300 to 600.
Claim 9
Dependent Claim
20 words
A process as claimed in claim 1, in which said monomer component consists essentially of a monomer of said formula.
Claim 10
Dependent Claim
17 words
A process as claimed in claim 1, in which said reaction mixture contains a fluidity improving agent.
Claim 11
Dependent Claim
73 words
A process as claimed in claim 5, in which prior to said emulsion polymerization step, said pigment, said surfactant and said monomer component (2) are premixed to form a uniform paste, and the paste thereby obtained is then mixed with said aqueous medium and said polymerization initiator and then the vinyl chloride is added to and mixed with the reaction mixture and then the reaction mixture is subjected to said emulsion polymerizing step.
Claim 12
Dependent Claim
31 words
A process as claimed in claim 1, in which the reaction mixture contains from 5 to 100 parts of monomer component (2) per 100 parts by weight of monomer component (1).
Claim 13
Dependent Claim
164 words
A powder paint composition adapted for application to substrates by a dry electrostatic spray coating process, consisting essentially of, substantially spherical, polymer particles having a particle size in the range of from 30 to 250 microns, a volume intrinsic resistivity in the range of from 10 9 to 10 13 ohm-cm and a bulk density of more than 0.3, said polymer particles having pigment particles embedded therein and uniformly dispersed throughout the interior thereof, the surfaces of the polymer particles being substantially free of adhering pigment particles, said pigment particles being present in an amount of from 0.1 to 50 weight percent, based on the sum of the weights of polymer components (1) and (2), said polymer consisting essentially of units of 1. first monomer component selected from the group consisting of vinyl chloride, monomer having the formula ##STR3## wherein R 1 is hydrogen or methyl and R 2 is a hydrocarbon group having 1 to 18 carbon atoms, and mixtures of said monomers
Claim 14
Dependent Claim
164 words
A powder paint composition adapted for application to substrates by a dry electrostatic spray coating process, consisting essentially of, substantially spherical, polymer particles having a particle size in the range of from 30 to 250 microns, a volume intrinsic resistivity in the range of from 10 9 to 10 13 ohm-cm and a bulk density of more than 0.3, said polymer particles having pigment particles embedded therein and uniformly dispersed throughout the interior thereof, the surfaces of the polymer particles being substantially free of adhering pigment particles, said pigment particles being present in an amount of from 0.1 to 50 weight percent, based on the sum of the weights of polymer components (1) and (2), said polymer consisting essentially of units of 1. first monomer component selected from the group consisting of vinyl chloride, monomer having the formula ##STR3## wherein R 1 is hydrogen or methyl and R 2 is a hydrocarbon group having 1 to 18 carbon atoms, and mixtures of said monomers
Claim 15
Dependent Claim
37 words
from 0 to 185 parts by weight, per 100 parts by weight of monomer component (1), of at least one comonomer copolymerizable with monomer component (1) and having a faster rate of polymerization then monomer component (1).
Claim 16
Dependent Claim
37 words
from 0 to 185 parts by weight, per 100 parts by weight of monomer component (1), of at least one comonomer copolymerizable with monomer component (1) and having a faster rate of polymerization then monomer component (1).
Claim 17
Dependent Claim
47 words
A powder paint composition as claimed in claim 10, in which said first monomer component is vinyl chloride, said polymer containing from 0.1 to 15 percent by weight of a stabilizer for polyvinyl chloride and said polymer having a degree of polymerization of from 300 to 600.
Claim 18
Dependent Claim
23 words
A powder paint composition as claimed in claim 10, in which said polymer consists of one or more monomer units of said formula.
Claim 19
Dependent Claim
32 words
A powder paint composition as claimed in claim 10, in which said polymer contains from 5 to 100 parts by weight of component (2) per 100 parts by weight of component (1).
Claim 20
Dependent Claim
44 words
A powder paint composition as claimed in claim 10, in which said particles contain one or more additives selected from the group consisting of plastic flow improving agents, stabilizers, ultraviolet ray absorbing agents, thermal stability improving agents, molecular weight adjusting agents and curing agents.
Claim 21
Dependent Claim
24 words
A powder paint composition as claimed in claim 10, in which the surfaces of said particles have a thermal decomposition preventing agent coated thereon.
Claim 22
Dependent Claim
18 words
A powder paint composition consisting essentially of the solid polymer particles prepared by the process of claim 1.
Claim 23
Dependent Claim
31 words
A process as claimed in claim 1 in which the vigorous agitation of the reaction mixture is effected by rotating an agitator having turbine blades at from 200 to 1200 rpm.
Claim 24
Dependent Claim
35 words
A powder paint composition as claimed in claim 12 containing a curing agent selected from the group consisting of dicyandiamide, boron trifluoride-piperidine, an epoxy compound or an acid anhydride effective to make said polymer thermosetting.
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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |