Global Patent Index - EP 0355816 A3

EP 0355816 A3 19920909 - COLLOIDAL ALUMINA AS A PAPER RETENTION AID

Title (en)

COLLOIDAL ALUMINA AS A PAPER RETENTION AID

Publication

EP 0355816 A3 19920909 (EN)

Application

EP 89115581 A 19890823

Priority

US 23681688 A 19880826

Abstract (en)

[origin: EP0355816A2] A binder which is added to a paper-making furnish comprising: a colloidal alumina sol having a positive surface charge and a colloidal alumina concentration in the range between 0.1-1%, the colloidal alumina having a particle size in the range between 1-50 nanometers and is added to the furnish in an amount between about 0.025-0.5% by weight; and an anionic polymer flocculant which is added to the furnish in an amount between about 0.01-0.1% by weight.

IPC 1-7

D21H 23/76; D21H 17/69

IPC 8 full level

D21H 17/33 (2006.01); D21H 17/37 (2006.01); D21H 17/42 (2006.01); D21H 17/63 (2006.01); D21H 17/67 (2006.01); D21H 21/10 (2006.01)

CPC (source: EP)

D21H 17/42 (2013.01); D21H 17/675 (2013.01); D21H 21/10 (2013.01)

Citation (search report)

  • [AP] US 4798653 A 19890117 - RUSHMERE JOHN D [US]
  • [AD] US 4643801 A 19870217 - JOHNSON KERRIE A [US]
  • [A] WO 8600100 A1 19860103 - EKA AB [SE]
  • DATABASE WPIL, no. 87-195623, Derwent Publications Ltd, London, GB; & JP-A-62 125 096 (SEIKO CHEM IND. K.K. et al.), The whole article.
  • TAPPI, vol 61, no. 11, November 1978, pages 111-114, Atlanta, US; B. ALINCE et al.: "Colloidal aspects of the retention of positively charged additives", The whole article.
  • WORLD PATENTS INDEX LATEST, Week 8327, Derwent Publ. Ltd, LONDON, GB, AN-83-703588; & JP-A-58 091 897 (KANZANI PAPER MFG K.K. et al.) 31-05-1983, Abstract.
  • [XP] WORLD PATENTS INDEX LATEST, Week 8935, Derwent Publ. Ltd, London, GB, AN-89-252471; & JP-A-01 183 598 (SHOWA DENKO K.K.) 21-07-1989, Abstract.
  • [X] WORLD PATENTS INDEX LATEST, Week 8305, Derwent Publ. Ltd., London, GB, AN-83-10668k; & JP-A-57 205 597 (SHIKOKU SEISHI K.K.) 16-12-1982, Abstract.

Designated contracting state (EPC)

AT BE CH DE ES FR GB GR IT LI LU NL SE

DOCDB simple family (publication)

EP 0355816 A2 19900228; EP 0355816 A3 19920909; BR 8903325 A 19900313; DE 355816 T1 19900927; ES 2014959 A4 19900801; JP H02259196 A 19901019

DOCDB simple family (application)

EP 89115581 A 19890823; BR 8903325 A 19890706; DE 89115581 T 19890823; ES 89115581 T 19890823; JP 21759889 A 19890825