US4600598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive coatings
Assignee: Eli Lilly and Co
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Filing: 1985-04-09
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Granted: 1986-07-15
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Expires: 2005-04-09
Abstract
Abstract A conductive pretreatment solution is disclosed which renders dried wood electrostatically coatable through several coatings while minimizing contamination of the topcoat. The pretreatment solution comprises a volatile liquid carrier selected from water and organic solvents, the carrier having dissolved therein, per 100 parts by volume of total solution, (1) from 0.2 to 3 parts by volume of an organic quaternary ammonium compound having a molecular weight below about 1000, (2) from 0.2 to 10 parts by volume of a low volatile liquid polyol having a molecular weight below about 400, and (3) from 0.1 to 3 parts by weight of an inorganic ionizable salt having a capacity to absorb moisture, especially chlorides of a cation selected from the group consisting of ammonium, magnesium and calcium.
Inventors
- 👤 Ronald S. Nelson
- 👤 John D. Loflin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:03
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/24
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
171 words
A method of coating dried wood comprising applying to the surface of said wood a conductive pretreatment solution comprising a volatile liquid carrier selected from the group consisting of water and organic solvents, said carrier having dissolved therein, per 100 parts by volume of total solution, (1) from 0.2 to 3 parts by volume of an organic quaternary ammonium compound having a molecular weight below about 1000, (2) from 0.2 to 10 parts by volume of a low volatile liquid polyol having a molecular weight below about 400, and (3) from 0.1 to 3 parts by weight of an inorganic ionizable salt having a capacity to absorb moisture, and dryng the same to remove said volatile carrier, then applying and drying at least one coating selected from washcoats, wiping stains, sealers, glazes, fillers, lacquer undercoats and lacquer enamels, and then electrostatically applying a solvent solution topcoat containing a film-forming resin, whereby said pretreatment is effective to assist electrostatic deposition of said topcoat without causing said topcoat to blush in humid atmospheres.
Claim 2
Independent Claim
171 words
A method of coating dried wood comprising applying to the surface of said wood a conductive pretreatment solution comprising a volatile liquid carrier selected from the group consisting of water and organic solvents, said carrier having dissolved therein, per 100 parts by volume of total solution, (1) from 0.2 to 3 parts by volume of an organic quaternary ammonium compound having a molecular weight below about 1000, (2) from 0.2 to 10 parts by volume of a low volatile liquid polyol having a molecular weight below about 400, and (3) from 0.1 to 3 parts by weight of an inorganic ionizable salt having a capacity to absorb moisture, and dryng the same to remove said volatile carrier, then applying and drying at least one coating selected from washcoats, wiping stains, sealers, glazes, fillers, lacquer undercoats and lacquer enamels, and then electrostatically applying a solvent solution topcoat containing a film-forming resin, whereby said pretreatment is effective to assist electrostatic deposition of said topcoat without causing said topcoat to blush in humid atmospheres.
Claim 3
Dependent Claim
15 words
A method as recited in claim 1 in which said salt is a chloride salt.
Claim 4
Dependent Claim
28 words
A method as recited in claim 2 in which said chloride salt is a salt of a cation selected from the group consisting of ammonium, magnesium and calcium.
Claim 5
Dependent Claim
30 words
A method as recited in claim 3 in which said solvent is constituted by organic solvents and from 0.1 to 4 parts water by volume per 100 parts total volume.
Claim 6
Dependent Claim
37 words
A method as recited in claim 3 in which said quaternary compound has a molecular weight below about 400, said polyol has a molecular weight below about 200 and contains at least three hydroxyl groups per molecule.
Claim 7
Dependent Claim
51 words
A method as recited in claim 5 in which said quaternary compound is present in an amount of from 0.5-1.5 parts by volume, said polyol is present in an amount of from 1.0-3.0 parts by volume and said chloride salt is present in an amount of from 0.2-1.5 parts by weight.
Claim 8
Dependent Claim
19 words
A method as recited in claim 3 in which said volatile solvents contain at least 20% of alcoholic solvent.
Claim 9
Dependent Claim
13 words
A method as recited in claim 5 in which said polyol is glycerine.
Claim 10
Dependent Claim
17 words
A method as recited in claim 5 in which said quaternary compound is benzyl trimethyl ammonium chloride.
Claim 11
Dependent Claim
14 words
A method as recited in claim 5 in which said salt is calcium chloride.
Claim 12
Dependent Claim
14 words
A method as recited in claim 5 in which said salt is ammonium chloride.
Claim 13
Dependent Claim
31 words
A method as recited in claim 1 in which said pretreated wood with said coatings thereon is subjected to a high humidity treatment shortly before the electrostatic deposition of said topcoat.
Claim 14
Dependent Claim
39 words
A method as recited in claim 12 in which said topcoat is electrodeposited while the surface of said pretreated and coated wood fails to show sufficient conductivity for electrostatic deposition when tested with electrodes placed at the surface thereof.
Claim 15
Dependent Claim
15 words
A method as recited in claim 1 in which said topcoat is a nitrocellulose lacquer.
Claim 16
Dependent Claim
17 words
A method as recited in claim 1 in which said topcoat is a cellulose acetate butyrate topcoat.
Claim 17
Dependent Claim
16 words
A method as recited in claim 1 in which said topcoat is an alkyd urea varnish.
Claim 18
Dependent Claim
15 words
A method as recited in claim 1 in which said topcoat is a polyester topcoat.
Claim 19
Dependent Claim
16 words
A method as recited in claim 1 in which said topcoat is a vinyl resin topcoat.
Claim 20
Dependent Claim
15 words
A method as recited in claim 1 in which said topcoat is a polyurethane topcoat.
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) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |