Method of producing water-soluble amine-modified urea-formaldehy

Details Method of producing water-soluble amine-modified urea-formaldehy Method of producing water-soluble amine-modified urea-formaldehy

1976-06-28

1977-04-19

Tillman, Murray

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 294R, 260 70R, 260 70M, 260849, C08G 1402, C08L 6120

Patent

active

040187403

ABSTRACT:
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 molecular weight 200-440, containing 10-16 wt.% of tertiary nitrogen, are reacted at 80-100.degree. C and pH of an alkaline medium 7.2-9.5 attained by the proper amount of polyamines. Aromatic or aliphatic sulphonic acids of the general formula R-SO.sub.3 H, where R is aryl or alkyl, are introduced into the obtained mixture until pH of an acid medium 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 reacted with polyoxyethylene ether or isooctylphenol with 7-11 oxyethylene units at 100-105.degree. C. The ethers are taken in amount of 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 surface 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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Chem. Abs. 67:P74748e; 71:P62449e.

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