Patent US3758632A successfully refreshed from Google Patents.
US3758632A
Expired / Lapsed
US
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Polymer and a flow control agent powdered coating composition of unsaturated glycidyl and anhydride co
Assignee: EIDP Inc
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Filing: 1971-08-16
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Granted: 1973-09-11
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Expires: 1991-08-16
Abstract
Abstract Powder coating compositions are disclosed. In general, individual powder coating compositions of this invention are a mixture of several materials. The most significant materials employed in the powder coatings include the following. A copolymer containing epoxy and anhydride crosslinkale, functional groups, forms the most important constituent of the powder coating. This copolymer has a glass transition temperature in the range of 40*C to 90*C and a molecular weight (Mn) in the range from about 3,000 to about 10,000. Another material of an individual composition is a flow control agent which forms at least 0.05 percent by weight of the mixture. The flow control agent is a polymer having a molecular weight (Mn) of at least 1000. Also, the flow control agent has a glass transition temperature at least 50*C lower than the glass transition temperature of the copolymer. Other materials which may be employed in individual powder coating compositions are catalysts, pigments, antistatic agents and plasticizers.
Inventors
- 👤 S Labana
- 👤 A Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:06
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/04; C09D133/14; C09D133/06; C09D133/062; C09D133/10; C09D157/00; C09D157/04; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/08; Y; Y10; Y10S; Y10S525/00; Y10S525/913; Y10S525/934; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31525; Y10T428/31529
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
195 words
A powder coating composition which, exclusive of catalyst, pigment, plasticizer, and an antistatic agent, comprises a mixture of: A. a copolymer containing (a) approximately stoichiometric quantities of two mono-ethylenically unsaturated monomers, one monomer containing from about 2 percent by weight to about 12 percent by weight of epoxy functional groups and the other monomer containing from about 2 percent by weight to about 8 percent by weight anhydride functional groups, and (b) ethylenically unsaturated monomers containing no functional groups and so selected that when both types of said monomers are reacted at their sites of unsaturation to form said copolymer, said copolymer will have a glass transition temperature in the range of 40*C to 90*C and a molecular weight (Mn) in the range of 3,000 to about 10,000; and B. a flow control agent forming from at least about 0.05 percent to about 4.0 percent by weight of the mixture, said flow control agent being a polymer having a molecular weight (Mn) of at least 1,000, said flow control agent being a polymer or copolymer selected from the group consisting of acrylate esters, methacrylate esters and polyethylene or polypropylene glycol esters of fluorinated fatty acids.
Claim 2
Dependent Claim
224 words
A powder coating composition comprising a mixture of: A. a copolymer formed from (a) approximately stoichiometric quantities of a monomer containing from about 2 percent to about 12 percent by weight of epoxy functional groups selected from the group consisting of glycidyl methacrylate and glycidyl acrylate and a monomer containing from about 2 percent to about 8 percent by weight of anhydride functional groups selected from the group consisting of maleic anhydride, itaconic anhydride, citraconic anhydride, dodecenyl succinic anhydride, dichloromaleic anhydride, and tetrahydraphthalic anhydride, said copolymer also containing (b) ethylenically unsaturated modifying monomers having no functional groups and so selected that said copolymer has a glass transition temperature of from 40*C to about 90*C and a molecular weight (Mn) in the range from about 3,000 to about 10,000; B. a flow control agent forming from at least 0.05 percent to about 4.0 percent by weight of the mixture, said flow control agent being a polymer having a molecular weight (Mn) of at least 1,000, said flow control agent being a polymer or a copolymer selected from the group consisting of acrylate esters, methacrylate esters and polyethylene or polypropylene glycol esters of fluorinated fatty acids; and C. a small weight percent of a catalyst which produces a gel time for the powder coating composition greater than 1 minute at the baking temperature of the composition.
Claim 3
Dependent Claim
35 words
A powder coating composition of claim 3 wherein: said modifying monomers are selected from the group consisting of methyl methacrylate, butyl methacrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, styrene, alpha methyl styrene, acrylonitrile, and methacrylonitrile.
Claim 4
Dependent Claim
63 words
The powder coating composition of claim 3 wherein: a pigment is included which forms from about 6 percent by weight to about 35 percent by weight of the total mixture, wherein: a small weight percentage of an antistatic agent is included, and wherein: a plasticizer is included from about 2 percent by weight to about 10 percent by weight of the total mixture.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |