Cationic urea/formaldehyde resins, their preparation and their u

Details Cationic urea/formaldehyde resins, their preparation and their u Cationic urea/formaldehyde resins, their preparation and their u

1995-03-22

1995-12-26

Acquah, Samuel A.

Stock material or miscellaneous articles

Composite

Of aldehyde or ketone condensation product

528230, 528246, 528248, 528252, 528254, 528256, 528259, 528266, 528392, 528423, 428526, B32B 2742

Patent

active

054786568

ABSTRACT:
Cationic urea/formaldehyde resins are obtainable by condensing urea and formaldehyde in a molar ratio of from 1:1.5 to 1:3 in the presence of polymers which contain not less than 1 mol % of polymerized vinylamine units and have Fikentscher K values of from 5 to 300, in an amount of from 5 to 50 g per mole of urea in the end product, where the mixture is first a) precondensed at a pH of from 8 to 14, then acidified and b) condensed at a pH of from 1 to 5 until gel formation begins, c) then from 0.3 to 1.5 moles of formaldehyde are added per mole of urea used, d) post-condensation is carried out and e) the resin solution is subsequently neutralized. The resins thus obtained are used in papermaking as assistants for increasing the dry and wet strength of paper and result in less dulling of the whiteness of the paper.

REFERENCES:
patent: 3275605 (1966-09-01), Eastes et al.
patent: 3752781 (1973-08-01), Muzyczko et al.
patent: 4663379 (1987-05-01), Fischer et al.

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