C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/91
C08G 14/02 (2006.01)
Patent
CA 1056097
Abstract of the Disclosure METHOD OF PRODUCTING WATER-SOLUBLE UREA-FORMALDEHYDE RESINS MODIFIED WITH ALIPHATIC POLYAMINES A method of producing water-soluble urea-formaldehyde resins modified with aliphatic polyamines, residing in that 1 mole of urea, 1.5-3.0 moles of formaldehyde, and branched aliphatic polyamines with a molecular weight of 200-440, containing 10-16 wt.% of tertiary nitrogen, are interacted at 80-100°C and pH of an alkaline medium 7.2-9.5 attained by a proper amount polyamines. Aromatic or aliphatic sulphonic of the general formula R-SO3H, where R is aryl or alkyl, are introduced into the obtained mixture until pH of an acid me- dium 4.8-6.0 is attained. Then an alkaline agent is added up to pH 7.2-9.5. As a result an oligomer is formed which is interacted with polyoxyethylene ether of isoctylphenol with 7-11 oxyethylene units at 100-105°C. The ethers are taken in an amount 0.2-2.0 wt. parts per 100 wt. parts of the initial urea. The proposed method of producing urea-formaldehyde resins modified with aliphatic polyamines ensures the production of resins which, being used in paper industry, completely replace colophony in manufacturing offset paper. They increase the sur- face strength of the paper and decrease dusting and picking. The method is simple in technology and can be performed both as a continuous and batch process.
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Aronova Lia I.
Eletskaya Vera K.
Kruglikov Anatoly A.
Kuftarev Vladimir V.
Sevrjugina Zoya S.
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