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US3624035A
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Polyether-melamines and process of manufacture
Assignee: Huels AG
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Filing: 1965-07-13
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Granted: 1971-11-30
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Expires: 1985-07-13
Abstract
Abstract Polyether-melamine resins produced by the reaction of hemiformals and/or hemiacetals of polyvalent alcohols, possibly in mixtures with monovalent alcohols, with melamine, possibly in mixtures with urea, and in the presence of acid or basic catalyst.
Inventors
- 👤 Hans Von Portatius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:32
CPC Classifications
C; C08; C08G; C08G4/00; C08G12/00; C08G12/02; C08G12/26; C08G12/30; C08G12/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A polyether-melamine process consisting essentially of: a. reacting a mixture of melamine and 5 to 95 percent by weight urea relative to said melamine with b. a hemiformal selected from the group consisting of monovalent hemiformals of polyvalent alcohols, polyvalent hemiformals of polyvalent alcohols, mixtures of monovalent hemiformals of polyvalent alcohols with hemiformals of monovalent alcohols, mixtures of polyvalvent hemiformals of polyvalent alcohols with hemiformals of monovalent alcohols, and mixtures thereof in the presence of c. a catalyst selected from the group consisting of acids and bases.
Claim 2
Dependent Claim
18 words
The process of claim 1, wherein the reaction takes place at a temperature between 30* and 95* C.
Claim 3
Dependent Claim
18 words
The process of claim 1, wherein the reaction takes place at a temperature between 60* and 90* C.
Claim 4
Dependent Claim
27 words
The process of claim 1, wherein the catalyst of (c) is an acid having a concentration of 0.0001 to 5 percent relative to the weight of melamine.
Claim 5
Dependent Claim
27 words
The process of claim 1, wherein the catalyst of (c) is an acid having a concentration of 0.01 to 3 percent relative to the weight of melamine.
Claim 6
Dependent Claim
27 words
The process of claim 1, wherein the catalyst of (c) is a base having a concentration of 0.0001 to 5 percent relative to the weight of melamine.
Claim 7
Dependent Claim
18 words
The process of claim 1, wherein the molar ratio of (b) to (a) is approximately 0.5:8 to 8.0:0.5.
Claim 8
Dependent Claim
12 words
A polyether-melamine resin condensation product consisting essentially of melamine, butane-diol-(1,4)-mono-hemiformal and thiodiglycol-bis-hemiformal.
References Cited (Backward Citations)
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US2168477A
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US2895923A
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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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |