GB375609A - Improved manufacture of condensation products of urea, thiourea and formaldehyde - Google Patents
Improved manufacture of condensation products of urea, thiourea and formaldehydeInfo
- Publication number
- GB375609A GB375609A GB24452/31A GB2445231A GB375609A GB 375609 A GB375609 A GB 375609A GB 24452/31 A GB24452/31 A GB 24452/31A GB 2445231 A GB2445231 A GB 2445231A GB 375609 A GB375609 A GB 375609A
- Authority
- GB
- United Kingdom
- Prior art keywords
- urea
- formaldehyde
- thiourea
- neutral
- examples
- 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
Synthetic resins are prepared by adding a neutral or alkaline condensation product of urea and thiourea with formaldehyde to a hot acid condensation solution of urea with formaldehyde, and continuing the heating until a resinous product precipitates on cooling. Preferably a non-acid solution containing urea, thiourea, and formaldehyde in the molecular proportions of 1 : 1 : 2 is introduced into an acid solution containing at least 2 molecular proportions of formaldehyde to 1 of urea until 1 molecular proportion of combined urea and thiourea corresponds to 1,4-1,8 of formaldehyde. In its simplest form, the process comprises the addition of a neutral solution of monomethylolurea and monomethylolthiourea to a hot acid solution of dimethylolurea. Examples are given. The precipitated products of the examples are mixed, either in their acid condition or after neutralization, with cellulose, dried at a low temperature, ground and moulded under heat and pressure. Specifications 213,567, 248,729, and 339,601, [all in Class 2 (iii), Dyes &c.], are referred to. The Specification as open to inspection under Sect. 91 (3) (a) refers to the use of aldehydes in general and of derivatives of urea and thiourea, and includes an example according to which a solution of urea and thiourea in neutral formaldehyde is added to hot acidified formaldehyde alone and the products which precipitate on boiling then dried. This subject-matter does not appear in the Specification as accepted.ALSO:Synthetic resins are prepared by adding a neutral or alkaline condensation product of urea and thiourea with formaldehyde to a hot acid condensation solution of urea with formaldehyde and continuing the heating until a resinous product precipitates on cooling. Examples are given. The precipitated products of the examples are mixed, either in their acid condition or after neutralization, with cellulose, dried at a low temperature, ground and moulded under heat and pressure. The Specification as open to inspection under Sect. 91 (3) (a) refers to the use of aldehydes in general and of derivatives of urea and thiourea; this subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE375609X | 1930-09-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB375609A true GB375609A (en) | 1932-06-30 |
Family
ID=6344100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB24452/31A Expired GB375609A (en) | 1930-09-01 | 1931-08-31 | Improved manufacture of condensation products of urea, thiourea and formaldehyde |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB375609A (en) |
-
1931
- 1931-08-31 GB GB24452/31A patent/GB375609A/en not_active Expired
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