Patent US4356285A successfully refreshed from Google Patents.
US4356285A
Expired / Lapsed
US
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Thermosetting resin composition
Assignee: Resonac Corp
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Filing: 1981-09-21
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Granted: 1982-10-26
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Expires: 2001-09-21
Abstract
Abstract A new thermosetting resin composition is provided. The composition is characterized by the use of an epoxy group-containing polyester resin and a hardener having two or more carboxy groups. The epoxy group-containing polyester resin may be prepared by reacting an epoxy ester resin intermediate having both epoxy and alkyl ester groups (which, in turn, may be prepared by reacting a polyepoxy compound having at least two epoxy groups with a monoalkyl terephthalate) with a hydroxy group-containing polyester resin. The composition is particularly suitable for powder coatings. By using the thermosetting resin composition, powder coatings exhibit superior coated film properties, such as weatherdurability, corrosion resistance, mechanical properties and anti-blocking property. Further, as the composition contains no volatile constituents upon hardening when applied to powder coatings, no environmental pollution takes place.
Inventors
- 👤 Yugo Kumagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:36
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/02; C08G59/12; Y; Y10; Y10S; Y10S525/00; Y10S525/934
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
68 words
A thermosetting resin composition which comprises, as the main components, (A) an epoxy group-containing polyester resin obtained by reacting a hydroxy group-containing polyester resin with an epoxy ester resin intermediate having both epoxy and alkyl ester groups, which intermediate being obtained, in turn, by reacting a polyepoxy compound having at least two epoxy groups with a monoalkyl terephthalate, and (B) a hardener containing two or more carboxy groups.
Claim 2
Dependent Claim
68 words
A thermosetting resin composition which comprises, as the main components, (A) an epoxy group-containing polyester resin obtained by reacting a hydroxy group-containing polyester resin with an epoxy ester resin intermediate having both epoxy and alkyl ester groups, which intermediate being obtained, in turn, by reacting a polyepoxy compound having at least two epoxy groups with a monoalkyl terephthalate, and (B) a hardener containing two or more carboxy groups.
Claim 3
Dependent Claim
61 words
A thermosetting resin composition as claimed in claim 1 in which said epoxy group-containing polyester resin contains at least 70 mole % aromatic carboxylic acid (where an aromatic hydroxycarboxylic acid is used, it is calculated as the member of said aromatic carboxylic acid) based on the total carboxylic acid constituents, and has the softening point of from 50° to 200° C.
Claim 4
Dependent Claim
34 words
A thermosetting resin composition as claimed in claim 1 in which said polyepoxy compound is selected from the group consisting of a bisphenol type epoxy resin, a hydrogenated bisphenol type epoxy resin and tris(2-epoxypropyl)isocyanurate.
Claim 5
Dependent Claim
17 words
A thermosetting resin composition as claimed in claim 1 in which said monoalkyl terephthalate is monomethyl terephthalate.
Claim 6
Dependent Claim
35 words
A thermosetting resin composition as claimed in claim 1 in which said hardener is selected from the group consisting of an aliphatic carboxylic acid, a carboxy group-containing polyester resin and a carboxy group-containing acrylic resin.
Claim 7
Dependent Claim
21 words
A thermosetting resin composition as claimed in claim 5 in which said aliphatic carboxylic acid is 1,2,3,4-butanetetracarboxylic acid and/or dodecanedioic acid.
Claim 8
Dependent Claim
53 words
A process for preparing an epoxy group-containing polyester resin which comprises reacting an epoxy ester resin intermediate (A') having both epoxy and alkyl ester groups, which intermediate being obtained, in turn, by reacting a polyepoxy compound having at least two epoxy groups with a monoalkyl terephthalate, with a hydroxy group-containing polyester resin (B').
Claim 9
Dependent Claim
53 words
A process for preparing an epoxy group-containing polyester resin which comprises reacting an epoxy ester resin intermediate (A') having both epoxy and alkyl ester groups, which intermediate being obtained, in turn, by reacting a polyepoxy compound having at least two epoxy groups with a monoalkyl terephthalate, with a hydroxy group-containing polyester resin (B').
Claim 10
Dependent Claim
48 words
A process as claimed in claim 7 in which said epoxy group-containing polyester resin contains at least 70 mole % aromatic carboxylic acid (where an aromatic hydroxy-carboxylic acid is used, it is calculated as the member of said aromatic carboxylic acid) based on the total carboxylic acid constituents.
Claim 11
Dependent Claim
24 words
A process as claimed in claim 7 in which said epoxy group-containing polyester resin has the softening point of from 50° to 200° C.
Claim 12
Dependent Claim
32 words
A process as claimed in claim 7 in which said polyepoxy compound is selected from the group consisting of a bisphenol type epoxy resin, a hydrogenated bisphenol type epoxy resin and tris(2-epoxypropyl)isocyanurate.
Claim 13
Dependent Claim
15 words
A process as claimed in claim 7 in which said monoalkyl terephthalate is monomethyl terephthalate.
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) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |