GB294253A - Improvements in or relating to urea-formaldehyde condensates - Google Patents
Improvements in or relating to urea-formaldehyde condensatesInfo
- Publication number
- GB294253A GB294253A GB21015/28A GB2101528A GB294253A GB 294253 A GB294253 A GB 294253A GB 21015/28 A GB21015/28 A GB 21015/28A GB 2101528 A GB2101528 A GB 2101528A GB 294253 A GB294253 A GB 294253A
- Authority
- GB
- United Kingdom
- Prior art keywords
- urea
- formaldehyde
- thiourea
- brittle
- distillation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/04—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
- C08G12/10—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with acyclic compounds having the moiety X=C(—N<)2 in which X is O, S or —N
- C08G12/12—Ureas; Thioureas
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Phenolic Resins Or Amino Resins (AREA)
Abstract
294,253. Budd Manufacturing Co., E. G., (Assignees of Smidth, L.). July 21, 1927, [Convention date]. Grant of Patent opposed. Condensation products of formaldehyde with urea and thiourea.-Urea is condensed in aqueous solution with formaldehyde, which is preferably slightly acid, at a relatively low temperature, e.g. at 25-50‹ C., the mixture is distilled in vacuo at a higher temperature, but preferably below 100‹ C., and thiourea is added either before or after the distillation. The mixture is then distilled again at a still higher temperature, e.g. 100-200‹ C. The viscous product may be poured into a. mould and allowed to cool, and the brittle soluble product so obtained may then be heated, e.g. at 70-90‹ C., for a considerable time, when it becomes tough and insoluble. Alternatively, the brittle soluble product mav be ground, mixed with fillers &c., and moulded under heat and pressure, or the viscous product obtained after the second distillation may be subjected directly to high pressure and temperatuure.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US294253XA | 1927-07-21 | 1927-07-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB294253A true GB294253A (en) | 1929-10-17 |
Family
ID=21848956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21015/28A Expired GB294253A (en) | 1927-07-21 | 1928-07-19 | Improvements in or relating to urea-formaldehyde condensates |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB294253A (en) |
-
1928
- 1928-07-19 GB GB21015/28A patent/GB294253A/en not_active Expired
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