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US4798744A Expired / Lapsed US ⏱️ 0.0 years remaining

Fixation of polymers retaining liquids in a porous structure

Assignee: Kaysersberg SA
•
Filing: 1986-07-22
•
Granted: 1989-01-17
•
Expires: 2006-07-22
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Abstract

Abstract PCT No. PCT/FR86/00257 Sec. 371 Date Mar. 23, 1987 Sec. 102(e) Date Mar. 23, 1987 PCT Filed Jul. 22, 1986 PCT Pub. No. WO87/00438 PCT Pub. Date Jan. 29, 1987.The process applies to polymers obtained by a water-in-oil process, that is to say, a reverse emulsion process or a suspension process in reversible phase. The process of fixation of this type of polymer in or on a porous support is characterized in that it comprises the impregnation of the porous support with said reverse suspension or emulsion resulting from the polymerization reaction and the removal of solvent from the support. By said process, complexes are obtained which present improved absorption properties and offer a better holding of the product to the support.

Inventors

  • 👤 Guy Goldstein
  • 👤 Michel Pierre

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 10:48
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/42; D21H17/43; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/425; A61L15/60

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 60 words
A process for the deposition and fixation of insoluble hydrophilic polymers in or on a porous support, said polymers being obtained according to a "water-in-oil" reverse emulsion or suspension process comprising impregnating the porous support with said reverse emulsion in the liquid state as it is recovered from the polymerization reaction, and thereafter removing the suspending solvent from the support.
Claim 2
Dependent Claim 60 words
A process for the deposition and fixation of insoluble hydrophilic polymers in or on a porous support, said polymers being obtained according to a "water-in-oil" reverse emulsion or suspension process comprising impregnating the porous support with said reverse emulsion in the liquid state as it is recovered from the polymerization reaction, and thereafter removing the suspending solvent from the support.
Claim 3
Dependent Claim 30 words
A process according to claim 1, wherein the reverse emulsion or suspension is destabilized during the impregnation in order to facilitate the deposition of the polymer on the porous support.
Claim 4
Dependent Claim 20 words
A process according to claim 2, wherein the reverse emulsion or suspension is destabilized by addition of water during impregnation.
Claim 5
Dependent Claim 27 words
A process according to claim 3, wherein the destabilizing water is added by impregnation of the porous support before its impregnation with the reverse emulsion or suspension.
Claim 6
Dependent Claim 21 words
A process according to claim 1, wherein the reverse emulsion or suspension includes between 10% and 30% of a hydrophilic polymer.
Claim 7
Dependent Claim 37 words
A process according to claim 1, wherein the porous support is a non-woven material, paper, a pad of bonded or unbonded cellulose and/or synthetic fibers, characterized in that the porosity of said support is greater than 0.5.

References Cited (Backward Citations)

US4059552A Cited
US4235237A Cited
EP0036463A2 Cited
GB2083487A Cited
EP0077510A2 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-01-17 1992-07-18 1993-01-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-01-17 1996-07-18 1997-01-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-01-17 2000-07-18 2001-01-17 $7700.00 Window Closed / Lapsed

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