Patent US4486558A successfully refreshed from Google Patents.
US4486558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical insulating powder for providing wire coating
Assignee: 3M Co
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Filing: 1984-02-09
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Granted: 1984-12-04
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Expires: 2004-02-09
Abstract
Abstract A carboxy-functional curative for epoxy resins comprising the reaction product of trimellitic anhydride and capped epoxy resins, the capped resins comprising a hydantoin diepoxide or a diglycidol ether of bisphenyl A reacted with benzoic acid or phenyl. The curative is used in conjunction with a thermosettable epoxy resin powder composition useful for applying electrically insulating coatings to electrical wire.
Inventors
- 👤 Curtis R. Guilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:11
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/40; C; C08; C08G; C08G59/00; C08G59/14; C08G59/1433; C08G59/1438; C08G59/18; C08G59/182; C08G59/186; C08G59/40; C08G59/42; C08G59/4292; Y; Y10; Y10S; Y10S525/00; Y10S525/908; Y10S525/934
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
73 words
A carboxy-functional adduct capable of acting as a curative for an epoxy resin comprising the reaction production of: (a) the reaction product of an epoxy resin selected from an hydantoin diepoxide and a diglycidyl ether of bisphenol A and, per mole of said epoxy resin, 2 moles of a reactant selected from the group consisting of phenol and benzoic acid; and (b) 2 moles per mole of said epoxy resin of trimellitic anhydride.
Claim 2
Dependent Claim
73 words
A carboxy-functional adduct capable of acting as a curative for an epoxy resin comprising the reaction production of: (a) the reaction product of an epoxy resin selected from an hydantoin diepoxide and a diglycidyl ether of bisphenol A and, per mole of said epoxy resin, 2 moles of a reactant selected from the group consisting of phenol and benzoic acid; and (b) 2 moles per mole of said epoxy resin of trimellitic anhydride.
Claim 3
Dependent Claim
172 words
A powder suitable for applying electrically insulating coatings to wire comprising a blend of: (a) a polyglycidyl ether of bisphenol A capped with a monobasic aromatic acid or a monobasic aromatic phenol in an amount of from about 1 to about 5 percent by weight of said polyglycidyl ether, said capped polyglycidyl ether having an epoxide equivalent weight of from about 1200 to about 2200 and an epoxide functionality of from about 1.2 to about 1.6; and (b) a carboxy functional adduct comprising the reaction product of: (i) the reaction product of an epoxy resin selected from the group consisting of an hydantoin diepoxide and a diglycidyl ether of bisphenol A and, per mole of said epoxy resin, 2 moles of a reactant selected from the group consisting of phenol and benzoic acid; and (ii) 2 moles, per mole of said epoxy resin, of trimellitic anhydride; said adduct being present at a concentration such that about 0.9 to about 1.5 equivalents of carboxyl groups are present per capped polyglycidyl ether epoxide equivalent.
Claim 4
Dependent Claim
172 words
A powder suitable for applying electrically insulating coatings to wire comprising a blend of: (a) a polyglycidyl ether of bisphenol A capped with a monobasic aromatic acid or a monobasic aromatic phenol in an amount of from about 1 to about 5 percent by weight of said polyglycidyl ether, said capped polyglycidyl ether having an epoxide equivalent weight of from about 1200 to about 2200 and an epoxide functionality of from about 1.2 to about 1.6; and (b) a carboxy functional adduct comprising the reaction product of: (i) the reaction product of an epoxy resin selected from the group consisting of an hydantoin diepoxide and a diglycidyl ether of bisphenol A and, per mole of said epoxy resin, 2 moles of a reactant selected from the group consisting of phenol and benzoic acid; and (ii) 2 moles, per mole of said epoxy resin, of trimellitic anhydride; said adduct being present at a concentration such that about 0.9 to about 1.5 equivalents of carboxyl groups are present per capped polyglycidyl ether epoxide equivalent.
Claim 5
Dependent Claim
24 words
The powder of claim 2 further including a catalytic amount of a catalyst for accelerating reaction between said capped polyglycidyl ether and said adduct.
Claim 6
Dependent Claim
12 words
The powder of claim 2 wherein said catalyst is a stannous salt.
Claim 7
Dependent Claim
12 words
The powder of claim 4 wherein said stannous salt is stannous octoate.
Claim 8
Dependent Claim
14 words
The powder of claim 2 wherein said blend further comprises a thermally stable pigment.
Claim 9
Dependent Claim
12 words
The powder of claim 2 wherein said monobasic acid is benzoic acid.
Claim 10
Dependent Claim
12 words
The powder of claim 2 wherein said monobasic aromatic phenol is phenol.
Claim 11
Dependent Claim
14 words
The powder of claim 2 wherein said blend further contains a flow control agent.
Claim 12
Dependent Claim
13 words
The powder of claim 2 wherein said blend further contains finely divided silica.
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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |