US4504374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultraviolet cured coating method to provide stone chip resistance
Assignee: Stamicarbon BV
•
Filing: 1983-03-09
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Granted: 1985-03-12
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Expires: 2003-03-09
Abstract
Abstract A method of providing a stone chip-resistant finish to the undersurface of an automobile is disclosed in which the undersurface is coated with a cationically initiated liquid mixture of cationically curable polyepoxide, polyhydric alcohol, and a photoinitiator for an ultraviolet-activated cationic cure. The liquid mixture is applied at a resin solids content of at least about 50% and in a thickness to provide a cured coating of at least 2 mils thick, and the wet coating is cured by exposing it to ultraviolet light. The automobile undersurface is desirably primed with a cross-linked amine-functional polymer primer, and the coating includes from 1% to 8% of a finely divided silica which prevents running but does not interfere with the ultraviolet cure.
Inventors
- 👤 Ronald J. Lewarchik
- 👤 Edward J. Murphy
- 👤 Elaine C. Beeks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:29
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/16; B05D7/50; B05D7/52; B05D7/54; B05D1/00; B05D1/007; B05D3/00; B05D3/06; B05D3/061; B05D3/065; B05D3/067
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
84 words
A method of providing a stone chip-resistant finish to the undersurface of an automobile comprising applying to said automobile undersurface a cationically initiated liquid mixture of cationically curable polyepoxide, polyhydric alcohol and/or water, and a photoinitiator and/or photosensitizer for an ultraviolet-activated cure, said liquid mixture being applied at a resin solids content of at least about 50% and in a thickness to provide a cured coating at least about 2 mils thick, and curing the wet coating by exposing the same to ultraviolet light.
Claim 2
Independent Claim
84 words
A method of providing a stone chip-resistant finish to the undersurface of an automobile comprising applying to said automobile undersurface a cationically initiated liquid mixture of cationically curable polyepoxide, polyhydric alcohol and/or water, and a photoinitiator and/or photosensitizer for an ultraviolet-activated cure, said liquid mixture being applied at a resin solids content of at least about 50% and in a thickness to provide a cured coating at least about 2 mils thick, and curing the wet coating by exposing the same to ultraviolet light.
Claim 3
Dependent Claim
14 words
A method as recited in claim 1 in which said automobile undersurface is primed.
Claim 4
Dependent Claim
24 words
A method as recited in claim 1 in which said cationically initiated liquid mixture contains from 1% to 8% of a finely divided silica.
Claim 5
Dependent Claim
31 words
A method as recited in claim 3 in which said cationically initiated liquid mixture has a viscosity suitable for air or electrostatic spray and is applied by air or electrostatic spray.
Claim 6
Dependent Claim
27 words
A method as recited in claim 1 in which said liquid mixture is applied in a thickness to provide a coating up to about 7 mils thick.
Claim 7
Dependent Claim
51 words
A method as recited in claim 4 in which said liquid mixture is applied at a resin solids content of at least about 75% and in a thickness to provide a coating having a thickness of from 3 to 6 mils and contains from 1.5% to 6% of finely divided silica.
Claim 8
Dependent Claim
24 words
A method as recited in claim 6 in which said finely divided silica is substantially the only finely divided material in said liquid mixture.
Claim 9
Independent Claim
88 words
A method of providing a stone chip-resistant finish to the undersurface of an automobile comprising applying to an automobile undersurface primed with a cross-linked amine-functional polymer primer, a cationically curable polyepoxide, polyhydric alcohol and/or water, and a photoinitiator and/or photosensitizer for an ultraviolet-activated cationic cure, said liquid mixture being applied at a resin solids content of at least about 50% and in a thickness to provide a cured coating of at least about 2 mils thick, and curing the wet coating by exposing the same to ultraviolet light.
Claim 10
Independent Claim
88 words
A method of providing a stone chip-resistant finish to the undersurface of an automobile comprising applying to an automobile undersurface primed with a cross-linked amine-functional polymer primer, a cationically curable polyepoxide, polyhydric alcohol and/or water, and a photoinitiator and/or photosensitizer for an ultraviolet-activated cationic cure, said liquid mixture being applied at a resin solids content of at least about 50% and in a thickness to provide a cured coating of at least about 2 mils thick, and curing the wet coating by exposing the same to ultraviolet light.
Claim 11
Dependent Claim
35 words
A method as recited in claim 8 in which said cross-linked amine-functional polymer primer is deposited from aqueous dispersion by cathodic electrodeposition in combination with a curing agent and is baked to cure the same.
Claim 12
Dependent Claim
16 words
A method as recited in claim 9 in which said curing agent is an organic polyisocyanate.
Claim 13
Dependent Claim
16 words
A method as recited in claim 9 in which said curing agent is an aminoplast resin.
Claim 14
Dependent Claim
27 words
A method as recited in claim 9 in which said liquid mixture is applied to a thickness to provide a coating up to about 7 mils thick.
Claim 15
Dependent Claim
21 words
A method as recited in claim 9 in which said cationically curable polyepoxide is used in admixture with a polyhydric alcohol.
Claim 16
Dependent Claim
16 words
A method as recited in claim 13 in which said cationically curable polyepoxide comprises cycloaliphatic polyepoxide.
Claim 17
Dependent Claim
23 words
A method as recited in claim 14 in which said cycloaliphatic polyepoxide is used in combination with a diglycidyl ether of a bisphenol.
Claim 18
Dependent Claim
25 words
A method as recited in claim 4 in which said liquid mixture contains an organic solvent medium having an evaporation rating of 0.8 or higher.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |