US4119679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder coating composition
Assignee: Resonac Corp
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Filing: 1977-10-11
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Granted: 1978-10-10
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Expires: 1997-10-11
Abstract
Abstract A powder coating composition which comprises a mixture of in a given proportion (A) a polyester resin which contains hydroxyl groups as functional group and contains at least 80 mol.% of an aromatic polycarboxylic acid component in the polycarboxylic acid component of said polyester resin, said polyester resin having a softening point of 50°-180° C, (b) a polyacyl-(N-lactam) compound or a polyacyl-(N-imide) compound having a softening point above 40° and (C) a said epoxy resin. The powder coating composition has a very good storage stability, free flowability at room temperature and exhibits good melt flow characteristics when heated above 130° C for baking. Coating films prepared from this powder coating composition are excellent in the mechanical resistance, corrosion resistance, solvent resistance and luster.
Inventors
- 👤 Hiroshi Nishizawa
- 👤 Shigeyoshi Tanaka
- 👤 Minoru Fujishima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:47
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/123; C08G63/127; C09; C09D; C09D167/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
236 words
A powder coating composition which comprises a mixture of (A) a polyester resin obtained by the polycondensation of at least one polyol and at least one polycarboxylic acid, said polyol and said polycarboxylic acid containing hydroxyl and carboxyl groups in such relative proportions and being condensed in such amount as to provide free hydroxyl groups in the resultant polyester, at least 80 mol.% of said polycarboxylic acid being an aromatic carboxylic acid, said polyester having a softening point in the range of 50°-180° C., (b) at least one curing agent for said polyester which is an aliphatic, cycloaliphatic, heterocyclic or aromatic compound having a softening point of at least 40° C. and contains at least two terminal groups of the general formulae: ##STR13## wherein R' stands for an alkylene group with 1-11 carbon atoms, and X and Y may be the same or different and each represents a hydrogen atom or an alkyl group with 1-5 carbon atoms, or ##STR14## wherein R" stands for an alkylene group with 1-11 carbon atoms, an alkenylene group, a phenylene group or a substituted phenylene group, the amount of said curing agent being such that the terminal groups thereof are present in a ratio of 0.5-1.5 equivalents per equivalent of the free hydroxyl groups in said polyester; and (C) a solid epoxy resin in an amount of 3-15 parts by weight per 100 parts by weight of said ingredient (A).
Claim 2
Dependent Claim
236 words
A powder coating composition which comprises a mixture of (A) a polyester resin obtained by the polycondensation of at least one polyol and at least one polycarboxylic acid, said polyol and said polycarboxylic acid containing hydroxyl and carboxyl groups in such relative proportions and being condensed in such amount as to provide free hydroxyl groups in the resultant polyester, at least 80 mol.% of said polycarboxylic acid being an aromatic carboxylic acid, said polyester having a softening point in the range of 50°-180° C., (b) at least one curing agent for said polyester which is an aliphatic, cycloaliphatic, heterocyclic or aromatic compound having a softening point of at least 40° C. and contains at least two terminal groups of the general formulae: ##STR13## wherein R' stands for an alkylene group with 1-11 carbon atoms, and X and Y may be the same or different and each represents a hydrogen atom or an alkyl group with 1-5 carbon atoms, or ##STR14## wherein R" stands for an alkylene group with 1-11 carbon atoms, an alkenylene group, a phenylene group or a substituted phenylene group, the amount of said curing agent being such that the terminal groups thereof are present in a ratio of 0.5-1.5 equivalents per equivalent of the free hydroxyl groups in said polyester; and (C) a solid epoxy resin in an amount of 3-15 parts by weight per 100 parts by weight of said ingredient (A).
Claim 3
Dependent Claim
89 words
A powder coating composition according to claim 1 wherein said ingredient (B) is at least one selected from the group consisting of terephthaloyl-bis-(N-pyrrolidone), adipoyl-bis-(N-pyrrolidone), terephthaloyl-bis-(N-caprolactam), isophthaloyl-bis-(N-caprolactam), sebacoyl-bis-(N-caprolactam), adipoyl-bis-(N-caprolactam), isophthaloyl-bis-(N-succinimide), adipoyl-bis-(N-succinimide), sebacoyl-bis-(N-phthalimide), fumaroyl-bis-(N-caprolactam), fumaroyl-bis-(N-succinimide), diglycoloyl-bis-(N-caprolactam), diglycoloyl-bis-(N-succinimide), trimellitoyl-tris-(N-caprolactam), ##STR15## and a mixture of polyacyl (N-lactam) compounds consisting essentially of a compound having 2-4 groupings of the formula: ##STR16## obtained by reacting a polyacid chloride compound which has been obtained by reacting trimethylolpropane with terephtahloyl or isophthaloyl chloride with ε-caprolactam in an amount equivalent to the acid chloride groups of said compound.
Claim 4
Dependent Claim
25 words
A powder coating composition according to claim 1 wherein said solid epoxy resin is one derived from a bisphenol and epihalohidrin or a cycloaliphatic one.
Claim 5
Dependent Claim
14 words
A powder coating composition according to claim 1 including a pigment and/or a filler.
Claim 6
Dependent Claim
13 words
A powder coating composition according to claim 1 including a fluidity adjusting agent.
Claim 7
Dependent Claim
28 words
A powder coating composition according to claim 1 including a benzoin in an amount of 0.1-6 parts by weight per 100 parts by weight of said ingredient (A).
Claim 8
Dependent Claim
36 words
A powder coating composition according to claim 1 including at least one of tetrabutyl titanate and a condensate thereof in an amount of 0.5-5 parts by weight per 100 parts by weight of said ingredient (A).
Claim 9
Dependent Claim
46 words
A method of powder coating which comprises applying to an object to be coated a coating of finely divided particles of the composition of claim 1 and baking the thus applied particle coating at a temperature within the range of 130°-220° C. for about 5-30 minutes.
Claim 10
Dependent Claim
55 words
The method of claim 8 wherein the particles of the composition of claim 1 applied to said object are obtained by mixing said mixture comprising the constituents defined in claim 1 at a temperature sufficient to fuse the same but below the reaction temperature of said constituents, then cooling and pulverizing said mixture into particles.
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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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |