GB258289A - Improvements in the manufacture and production of condensation products of urea and formaldehyde - Google Patents

Improvements in the manufacture and production of condensation products of urea and formaldehyde

Info

Publication number
GB258289A
GB258289A GB22546/26A GB2254626A GB258289A GB 258289 A GB258289 A GB 258289A GB 22546/26 A GB22546/26 A GB 22546/26A GB 2254626 A GB2254626 A GB 2254626A GB 258289 A GB258289 A GB 258289A
Authority
GB
United Kingdom
Prior art keywords
buffer
mono
sodium
urea
production
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
Application number
GB22546/26A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Publication of GB258289A publication Critical patent/GB258289A/en
Expired legal-status Critical Current

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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Coloring (AREA)

Abstract

258,289. I. G. Farbenindustrie Akt.- Ges. Sept. 11, 1925, [Convention date]. Urea-formaldehyde condensation products are formed in an aqueous solution in which pH is continuously maintained at a practically constant value between 4 and 7 with the aid of a buffer compound; the water is then removed by evaporation, preferably in vacuo, while keeping the temperature, at least in the latter stage below 50‹ C. Buffer compounds mentioned are mono- and disodium phosphates, potassium bioxalate, and mixtures of acetic acid and sodium acetate, of citric acid and sodium citrate, and of boric acid and sodium acetate. Generally from 2 to 3 molecular proportions of formaldehyde are employed for each molecular proportion of urea. The products may be hardened at a temperature of 50-100‹ C. and used for the production of plates, prisms, lenses, &c. When employed in the production of lacquers, the solvent required, e.g. ethylene chlorhydrin is advantageously added before condensation takes place. An example is given in which a mixture of mono- and di-sodium phosphate is used as a buffer agent. The Specification as open to inspection under Sect. 91 (3) (a) refers also to sodium bitartrate as a buffer compound and includes two examples in which the use of sodium acetate with acetic acid and of trisodium phosphate with chloracetic acid as buffer agents is described. The employment of ethylene glycol mono-methyl and mono-ethyl ethers as lacquer solvents is also mentioned. This subject-matter does not appear in the Specification as accepted.
GB22546/26A 1925-09-11 1926-09-13 Improvements in the manufacture and production of condensation products of urea and formaldehyde Expired GB258289A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE258289X 1925-09-11
GB24298/26A GB288346A (en) 1925-09-11 1926-10-01 Improvements in the manufacture and production of condensation products of urea and formaldehyde

Publications (1)

Publication Number Publication Date
GB258289A true GB258289A (en) 1928-03-13

Family

ID=62527946

Family Applications (2)

Application Number Title Priority Date Filing Date
GB22546/26A Expired GB258289A (en) 1925-09-11 1926-09-13 Improvements in the manufacture and production of condensation products of urea and formaldehyde
GB24298/26A Expired GB288346A (en) 1925-09-11 1926-10-01 Improvements in the manufacture and production of condensation products of urea and formaldehyde

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB24298/26A Expired GB288346A (en) 1925-09-11 1926-10-01 Improvements in the manufacture and production of condensation products of urea and formaldehyde

Country Status (1)

Country Link
GB (2) GB258289A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1241612B (en) * 1962-05-12 1967-06-01 Basf Ag Process for the production of aqueous solutions of nitrogen-containing polycondensates

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1241612B (en) * 1962-05-12 1967-06-01 Basf Ag Process for the production of aqueous solutions of nitrogen-containing polycondensates

Also Published As

Publication number Publication date
GB288346A (en) 1928-04-02

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