Patent US4780340A successfully refreshed from Google Patents.
US4780340A
Expired / Lapsed
US
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Primer paint or primer surfacer composition
Assignee: Polyplastics Co Ltd
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Filing: 1987-07-16
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Granted: 1988-10-25
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Expires: 2007-07-16
Abstract
Abstract A plastic article, in particular a highly crystalline plastic, can be effectively coated with a paint by using a primer composition comprising (A) a polyurethane, (B) a spiro-ortho-ester resin being capable of the ring-opening expansion, (C) a cellulose derivative and (D) a surfactant having a hydroxy group.
Inventors
- 👤 Katsuhiko Takahashi
- 👤 Yoshiharu Suzuki
- 👤 Haruyasu Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:07
CPC Classifications
C; C09; C09D; C09D5/00; C09D175/00; C09D175/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
56 words
A primer paint or primer surfacer composition which comprises the components: (A) 50 to 97 wt.% of a polyurethane, (B) 2 to 40 wt.% of a spiro-ortho-ester resin capable of undergoing a ring-opening expansion, (C) 1 to 9 wt.% of a cellulose derivative, and (D) 0.05 to 1 wt.% of a surfactant having a hydroxy group.
Claim 2
Dependent Claim
56 words
A primer paint or primer surfacer composition which comprises the components: (A) 50 to 97 wt.% of a polyurethane, (B) 2 to 40 wt.% of a spiro-ortho-ester resin capable of undergoing a ring-opening expansion, (C) 1 to 9 wt.% of a cellulose derivative, and (D) 0.05 to 1 wt.% of a surfactant having a hydroxy group.
Claim 3
Dependent Claim
75 words
A composition as claimed in claim 1, in which the polyurethane of component (A) has a number-average molecular weight of 2,000 to 10,000, the resin of component (B) has a spiro-ortho esterification degree of 250 to 500 g/eq and an epoxy value of zero to 5.0 g/eq, and the cellulose derivative of component (C) has a hydroxy group content of 1 to 3 per 4 glucose units and a viscosity of 0.01 to 20.0 sec.
Claim 4
Dependent Claim
12 words
A composition as claimed in claim 1, which further comprises a solvent.
Claim 5
Dependent Claim
29 words
A method for coating a plastic article with a paint, which comprises first coating the article with the composition as defined in claim 1 and second with the paint.
Claim 6
Dependent Claim
38 words
A composition as claimed in claim 3 wherein any component which is insoluble in the solvent is present in the form of particles uniformly dispersed in the solvent and having a particle size of 10 microns or less.
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) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |