Title:
METHOD OF IMPROVING THE CRUSHING STRENGTH AND THE IMPACT RESISTANCE OF UREA, AND UREA COMPOSITION
Document Type and Number:
WIPO Patent Application WO2002020471
Kind Code:
A3
Abstract:
The invention relates to a method of improving the crushing strength and impact resistance of urea granules by the addition of an additive comprising a polyvinyl compound of the general formula (CHX-CHY)n, where n = 4-10 000, and X and Y independently of one another are selected from the group consisting of a hydrogen atom, a hydroxyl radical, carboxylic acid radical, amine radical or amide radical. This method is characterized in that it starts with a urea melt.
Inventors:
VAN DER HOEVEN JOHN (NL)
NOORDOVER JOHANNES JOSEPH (NL)
BIJPOST ERIK ALEXANDER (NL)
VELZEL ARJEN WIM (NL)
NOORDOVER JOHANNES JOSEPH (NL)
BIJPOST ERIK ALEXANDER (NL)
VELZEL ARJEN WIM (NL)
Application Number:
PCT/NL2001/000663
Publication Date:
August 08, 2002
Filing Date:
September 07, 2001
Export Citation:
Assignee:
HOLLAND NOVOCHEM B V (NL)
VAN DER HOEVEN JOHN (NL)
NOORDOVER JOHANNES JOSEPH (NL)
BIJPOST ERIK ALEXANDER (NL)
VELZEL ARJEN WIM (NL)
VAN DER HOEVEN JOHN (NL)
NOORDOVER JOHANNES JOSEPH (NL)
BIJPOST ERIK ALEXANDER (NL)
VELZEL ARJEN WIM (NL)
International Classes:
C05C9/00; C07C273/14; (IPC1-7): C05C9/00; C07C273/14
Foreign References:
| DD131062A3 | 1978-05-31 | |||
| GB1217106A | 1970-12-31 | |||
| US4587358A | 1986-05-06 |
Other References:
DATABASE CA [online] CHEMICAL ABSTRACTS SERVICE, COLUMBUS, OHIO, US; KUZNETSOVA, A. E. ET AL: "Noncaking urea", XP002191015, retrieved from STN Database accession no. 92:75271 CA
CHEMICAL ABSTRACTS, vol. 94, no. 19, 11 May 1981, Columbus, Ohio, US; abstract no. 155642, KIRSANOV: "Increase in the mechanical strength of urea" XP002191013
CHEMICAL ABSTRACTS, vol. 107, no. 19, 1987, Columbus, Ohio, US; abstract no. 175082h, BARANYI: "Granulation of urea with addition of aluminium and zinc salts" XP002191014
CHEMICAL ABSTRACTS, vol. 94, no. 19, 11 May 1981, Columbus, Ohio, US; abstract no. 155642, KIRSANOV: "Increase in the mechanical strength of urea" XP002191013
CHEMICAL ABSTRACTS, vol. 107, no. 19, 1987, Columbus, Ohio, US; abstract no. 175082h, BARANYI: "Granulation of urea with addition of aluminium and zinc salts" XP002191014
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