GB256248A - Improvements in producing resinous condensation products of the urea-formaldehyde type - Google Patents

Improvements in producing resinous condensation products of the urea-formaldehyde type

Info

Publication number
GB256248A
GB256248A GB18875/26A GB1887526A GB256248A GB 256248 A GB256248 A GB 256248A GB 18875/26 A GB18875/26 A GB 18875/26A GB 1887526 A GB1887526 A GB 1887526A GB 256248 A GB256248 A GB 256248A
Authority
GB
United Kingdom
Prior art keywords
urea
formaldehyde
added
paraformaldehyde
dissolved
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
GB18875/26A
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.)
Rohm and Haas Co
Original Assignee
Rohm and Haas Co
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 Rohm and Haas Co filed Critical Rohm and Haas Co
Publication of GB256248A publication Critical patent/GB256248A/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)
  • Compositions Of Macromolecular Compounds (AREA)
  • Phenolic Resins Or Amino Resins (AREA)

Abstract

256,248. Rohm & Haas Co., (Assignees of Lauter, F'.). July 28, 1925, [Convention date]. Urea-formaldehyde and like condensation prodiects.-In the manufacture of condensation products of urea, thiourea or their derivatives with formaldehyde, the aldehyde is dissolved in an organic solvent such as alcohol, benzene, toluene. acetone, or carbon tetrachloride, and is mixed with the urea &c. in the presence or absence of a polyhydric alcohol, such as glycerol or an ester thereof. The products possess water-resistant properties, whilst those made in the presence of a polyhydric alcohol are flexible and can be used for the manufacture of photographic films. Preferably 2.7 moles of formaldehyde are employed to each mole of urea, with an additional mole of formaldehyde for each mole of glycerol present, which latter however should not exceed the proportion of 1.2 moles of glycerol per mole of urea. The formaldehyde may be employed in the form of its polymers or derivatives, such as paraformaldehyde or hexamethylenetetramine. Acidic or basic condensing agents or both may be present. If the condensation product is to be used as a lacquer or varnish, some of the solvent is allowed to remain; otherwise, the whole of the solvent is driven off by heat to obtain a hard product. The hardening may be effected under pressure to produce a moulded product. According to the examples, (1) paraformaldehyde is dissolved in hot methyl alcohol containing a little ammonium hydroxide, urea is added, and the mass is concentrated ; (2) in a heated mixture of acetone and ammonium hydroxide, paraformaldehyde is dissolved and an acetone solution of urea then added ; after heating for some time, a little nitric acid is added and the mass again heated; (3) paraformaldehyde is dissolved in hot ethyl alcohol containing ammonium hydroxide, urea and glycerol are added, and the mass heated; a little nitric acid is further added and boiling continued until the desired consistency is reached. The Specification as open to inspection under Sect. 91 (3) (a) comprises the use of aldehydes in general. This subject-matter does not appear in the Specification as accepted.
GB18875/26A 1925-07-28 1926-07-28 Improvements in producing resinous condensation products of the urea-formaldehyde type Expired GB256248A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US256248XA 1925-07-28 1925-07-28

Publications (1)

Publication Number Publication Date
GB256248A true GB256248A (en) 1927-12-28

Family

ID=21827145

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18875/26A Expired GB256248A (en) 1925-07-28 1926-07-28 Improvements in producing resinous condensation products of the urea-formaldehyde type

Country Status (1)

Country Link
GB (1) GB256248A (en)

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