US4332925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified polyamideimide resins
Assignee: Von Roll Isola USA Inc
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Filing: 1981-03-30
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Granted: 1982-06-01
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Expires: 2001-03-30
Abstract
Abstract Polyamideimides prepared by polycondensation of trimellitic anhydride, diphenyl methane diisocyanate and an isocyanate mixture are provided. These preparations exhibit low viscosity in high-solids solutions and are useful as wire enamels and topcoats over polyester and polyesterimide base coats.
Inventors
- 👤 Yue-guey L. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:59
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/34; C08G18/343; C08G18/345; C08G18/70; C08G18/72; C08G18/721; C08G18/77; C08G18/78; C08G18/79; C08G18/797
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
116 words
A polyamideimide having relatively low viscosity in high-solids solutions prepared from the following components: (a) trimellitic anhydride; and (b) an isocyanate mixture comprising (i) from 75 to 99 mole % of a diisocyanate of the formula OCN--R--NCO, and (ii) from 25 to 1 mole % of an isocyanate mixture comprising a diisocyanate of the formula OCN--R--NCO, and a triisocyanate of the formula ##STR6## where R is a divalent hydrocarbon radical of from 2 to 30 carbon atoms, optionally containing --O--, --SO 2 -- and --S-- groups; said components being subjected to polycondensation at a temperature of about 60° C. to 150° C. in the presence of an inert solvent comprising methylpyrrolidone and a catalyst for polycondensation.
Claim 2
Dependent Claim
116 words
A polyamideimide having relatively low viscosity in high-solids solutions prepared from the following components: (a) trimellitic anhydride; and (b) an isocyanate mixture comprising (i) from 75 to 99 mole % of a diisocyanate of the formula OCN--R--NCO, and (ii) from 25 to 1 mole % of an isocyanate mixture comprising a diisocyanate of the formula OCN--R--NCO, and a triisocyanate of the formula ##STR6## where R is a divalent hydrocarbon radical of from 2 to 30 carbon atoms, optionally containing --O--, --SO 2 -- and --S-- groups; said components being subjected to polycondensation at a temperature of about 60° C. to 150° C. in the presence of an inert solvent comprising methylpyrrolidone and a catalyst for polycondensation.
Claim 3
Dependent Claim
13 words
A polyamideimide prepared as in claim 1 where R is selected from ##STR7##
Claim 4
Dependent Claim
13 words
A polyamideimide prepared as in claim 1 where R has the formula ##STR8##
Claim 5
Dependent Claim
19 words
A polyamideimide prepared as in claim 3 where the equivalent ratio of components (a), (b)(i) and (b)(ii) is 1:(0.891-0.909):(0.099-0.101).
Claim 6
Dependent Claim
12 words
A polyamideimide prepared as in claim 1 where the catalyst is 2-methylimidazole.
Claim 7
Dependent Claim
13 words
A polyamideimide prepared as in claim 1 where the solvent further comprises xylene.
Claim 8
Dependent Claim
14 words
A polyamideimide prepared as in claim 1 where the solvent further comprises naphtha solvent.
Claim 9
Dependent Claim
123 words
A polyamideimide having relatively low viscosity in high-solids solution prepared from the following components: (a) trimellitic anhydride; (b) an isocyanate mixture comprising: (i) from 75 to 99 mole % of a diisocyanate of the formula OCN--R--NCO; and (ii) an equilibrated isocynate system comprising a diisocyanate of the formula OCN--R--NCO and its cyclotriisocyanate adduct having the formula ##STR9## produced by reaction of the diisocyanate with a carbodiimide of the formula OCN--R--N═C═N--R--NCO, where R is a divalent hydrocarbon radical of from 2 to 30 carbon atoms, optionally containing --O--, --SO 2 -- and --S-- groups; said components being subjected to polycondensation at a temperature of about 60° C. to 150° C. in the presence of an inert solvent comprising methylpyrrolidone and a catalyst for polycondensation.
Claim 10
Dependent Claim
123 words
A polyamideimide having relatively low viscosity in high-solids solution prepared from the following components: (a) trimellitic anhydride; (b) an isocyanate mixture comprising: (i) from 75 to 99 mole % of a diisocyanate of the formula OCN--R--NCO; and (ii) an equilibrated isocynate system comprising a diisocyanate of the formula OCN--R--NCO and its cyclotriisocyanate adduct having the formula ##STR9## produced by reaction of the diisocyanate with a carbodiimide of the formula OCN--R--N═C═N--R--NCO, where R is a divalent hydrocarbon radical of from 2 to 30 carbon atoms, optionally containing --O--, --SO 2 -- and --S-- groups; said components being subjected to polycondensation at a temperature of about 60° C. to 150° C. in the presence of an inert solvent comprising methylpyrrolidone and a catalyst for polycondensation.
Claim 11
Dependent Claim
13 words
A polyamideimide prepared as in claim 8 where R is selected from ##STR10##
Claim 12
Dependent Claim
13 words
A polyamideimide prepared as in claim 8 where R has the formula ##STR11##
Claim 13
Dependent Claim
19 words
A polyamideimide prepared as in claim 10 where the equivalent ratio of components (a), (b)(i) and (b)(ii) is 1:(0.891-0.909):(0.099-0.101).
Claim 14
Dependent Claim
12 words
A polyamideimide prepared as in claim 8 where the catalyst is 2-methylimidazole.
Claim 15
Dependent Claim
13 words
A polyamideimide prepared as in claim 8 where the solvent further comprises xylene.
Claim 16
Dependent Claim
14 words
A polyamideimide prepared as in claim 8 where the solvent further comprises naphtha solvent.
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) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |