EP0470123A1 - Compositions pour l'enduction du papier. - Google Patents

Compositions pour l'enduction du papier.

Info

Publication number
EP0470123A1
EP0470123A1 EP90906327A EP90906327A EP0470123A1 EP 0470123 A1 EP0470123 A1 EP 0470123A1 EP 90906327 A EP90906327 A EP 90906327A EP 90906327 A EP90906327 A EP 90906327A EP 0470123 A1 EP0470123 A1 EP 0470123A1
Authority
EP
European Patent Office
Prior art keywords
urea
akd
paper
thiourea
weight
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.)
Granted
Application number
EP90906327A
Other languages
German (de)
English (en)
Other versions
EP0470123B1 (fr
Inventor
Edwin Dowthwaite
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.)
Ciba Specialty Chemicals RC GB Ltd
Original Assignee
Roe Lee Paper Chemicals Co Ltd
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 Roe Lee Paper Chemicals Co Ltd filed Critical Roe Lee Paper Chemicals Co Ltd
Priority to AT90906327T priority Critical patent/ATE98718T1/de
Publication of EP0470123A1 publication Critical patent/EP0470123A1/fr
Application granted granted Critical
Publication of EP0470123B1 publication Critical patent/EP0470123B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/09—Sulfur-containing compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/07—Nitrogen-containing compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/17—Ketenes, e.g. ketene dimers

Definitions

  • the present invention relates to paper sizing compositions.
  • sizing compositions for imparting a degree of water resistance to paper is well known.
  • One such sizing composition comprises an aqueous dispersion of an alkyl ketene dimer (AKD) which has particular use in the preparation of paper containing chalk as a filler.
  • ALD alkyl ketene dimer
  • AKD sizes do however have the disadvantage of being comparatively expensive to use due to the cost of the AKD itself.
  • a paper sizing composition which comprises an aqueous dispersion of an alkyl ketene dimer characterized in that the dispersion incorporates urea, thiourea or derivatives thereof.
  • the invention further provides a method of preparing a sized paper comprising treating the paper or the fibrous stock (eg. cellulose fibres) from which it is prepared with a dispersion of an alkyl ketene dimer and with urea, thiourea or derivatives thereof.
  • this method is effected by means of dispersion of the AKD which also includes the urea, thiourea (or derivatives). It is however within the scope of the invention to introduce the AKD dispersion and the urea (or thiourea or derivatives) as two separate components into the sizing process.
  • the invention also provides paper which has been sized with a composition in accordance with the invention.
  • the derivatives of urea and thiourea which may be used in accordance with the invention are those having a molecular weight up to 1000, and include salts of urea and thiourea.
  • the sizing compositions in accordance with the invention may be produced easily by admixing a dispersion of AKD (the production of which is well established technology) with a solution of urea (or thiourea or derivative).
  • the resultant product may comprise 1 to 30 parts by weight (more preferably 1 to 18 pbw, most preferably 1 to 12 pbw, eg. 4 to 8 pbw) of alkyl ketene dimer per 100 pbw of dispersion together with an amount of urea (or thiourea or derivative) which is up to 2 times by weight that of the AKD.
  • the dispersion will comprise an amount of urea, thiourea or derivative thereof which is from 5 to 20% by weight (more preferably 5 to 15%, most preferably about 10% by weight of the total weight of the AKD and urea, thiourea or derivative thereof.
  • Urea is the preferred compound for use in the invention because of its cheapness.
  • compositions have been found to be storage stable and microscopic examination of the composition (after storage) has revealed no evidence of flocculation or separations.
  • the sizing compositions of the invention may also contain additional components as used in standard AKD emulsions.
  • additional components include cationic starch, which may be used in an amount of 1- 3%.
  • Further components are surface active agents, eg. sodium ligno sulphate.
  • urea, thiourea and derivatives thereof may be used in partial replacement of the AKD in the dispersion without detriment to sizing properties. Since urea, thiourea and their derivatives are generally considerably cheaper than AKD itself, this obviously means that there is a cost saving as between an AKD dispersion in which the AKD is partially replaced by urea, thiourea or a derivative thereof and one in which there is no such substitution without there being less in sizing performance. Most preferably it is urea which is used as the partial replacement of the AKD.
  • aqueous AKD dispersion comprising 5.4% by weight of AKD and 0.6% by weight of dissolved urea together with about 1.5% by weight of starch and about 0.3% surfactant was used over a three month period for the sizing of high quality printing and writing paper.
  • the average amount of the dispersion used (expressed as a percentage) per tonne of paper produced over this period is shown in the middle column of Table 1 below.
  • the right hand column of Table 1 shows the corresponding figures for the same three months of the previous year during which sizing was effected with a dispersion comprising 6% by weight of AKD, about 1.5% by weight of cationic starch, and 0.3% by weight of surfactant.
  • An AKD dispersion of the following composition was prepared by standard techniques.
  • the resultant product was used for sizing in the production of 200 gsm caseliner.
  • the Cobb values of the 'as produced' paper were measured by standard techniques and are shown in the first column of Table 2 below. Additionally, samples of the 'as produced' paper were heated for 10 minutes at 105°C and the Cobb values measured. The results i are again included in the second column of Table 1. This latter test corresponds to that used in the production of paper using AKD size without a curing agent where the 10 minute heating is used to simulate the storage of the paper of the reel for 3 days and thus give an indication of the quality of the sizing. Finally, the Cobb values of the paper from the reel were re-measured after several days and are shown in the third column of the Table.
  • Table 3 gives a data for caseliner produced with the AKD size without added urea.

Landscapes

  • Paper (AREA)

Abstract

Composition pour l'enduction du papier comprenant une dispersion aqueuse d'un dimère d'une cétène alcoyle qui incorpore aussi de l'urée, de la thiourée ou un dérivé de celles-ci. L'incorporation de l'urée, de la thiourée ou d'un dérivé de celles-ci dans la dispersion permet la réduction de la quantité du dimère de cétène alcoyle, ainsi diminuant le coût de la composition, sans en diminuer le rendement.
EP90906327A 1989-04-25 1990-04-25 Compositions pour l'enduction du papier Expired - Lifetime EP0470123B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90906327T ATE98718T1 (de) 1989-04-25 1990-04-25 Papierleimungszusammensetzungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898909421A GB8909421D0 (en) 1989-04-25 1989-04-25 Paper sizing compositions
GB8909421 1989-04-25

Publications (2)

Publication Number Publication Date
EP0470123A1 true EP0470123A1 (fr) 1992-02-12
EP0470123B1 EP0470123B1 (fr) 1993-12-15

Family

ID=10655680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90906327A Expired - Lifetime EP0470123B1 (fr) 1989-04-25 1990-04-25 Compositions pour l'enduction du papier

Country Status (10)

Country Link
EP (1) EP0470123B1 (fr)
JP (1) JPH04505779A (fr)
AU (1) AU5525990A (fr)
BR (1) BR9007318A (fr)
CA (1) CA2051635A1 (fr)
DE (1) DE69005302T2 (fr)
ES (1) ES2049031T3 (fr)
FI (1) FI914966A7 (fr)
GB (1) GB8909421D0 (fr)
WO (1) WO1990012921A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2342478C1 (ru) * 2007-04-28 2008-12-27 Московский государственный университет леса Состав для поверхностной обработки целлюлозосодержащих материалов (варианты)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3311532A (en) * 1965-03-17 1967-03-28 American Cyanamid Co Ketene dimer paper sizing compositions including acyl compound extender and paper sized therewith
EP0221073A1 (fr) * 1984-08-11 1987-05-13 Roe Lee Paper Chemicals Co. Limited Encollage de papier et de materiaux analogues

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9012921A1 *

Also Published As

Publication number Publication date
BR9007318A (pt) 1992-04-21
DE69005302D1 (de) 1994-01-27
WO1990012921A1 (fr) 1990-11-01
AU5525990A (en) 1990-11-16
FI914966A0 (fi) 1991-10-22
EP0470123B1 (fr) 1993-12-15
JPH04505779A (ja) 1992-10-08
FI914966A7 (fi) 1991-10-22
GB8909421D0 (en) 1989-06-14
DE69005302T2 (de) 1994-06-30
ES2049031T3 (es) 1994-04-01
CA2051635A1 (fr) 1990-10-26

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