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US4146669A Expired / Lapsed US ⏱️ 0.0 years remaining

Crosslinking agent, method of producing same and paper made with the use thereof

Assignee: Tsentralny Nauchno-Issledovatelsky Institut Bumagi (Tsniib)
•
Filing: 1977-01-12
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Granted: 1979-03-27
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Expires: 1997-01-12
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Abstract

Abstract A characteristic feature of the present invention is that the crosslinking agent comprises grains, each grain having a nucleus consisting of a substance inert to the substance forming crosslinks with hydroxyl-containing water-soluble polymers, and an external layer surrounding said nucleus and containing compounds of tetravalent metals selected from the group consisting of titanium, zirconium, hafnium and tin. The particles for the chemical treatment of hydroxyl-containing water-soluble polymers can be prepared by applying a substance capable of forming crosslinks with the hydroxyl-containing water-soluble polymers on inert, finely dispersed particles and by hydrolytically treating this substance so as to form an external layer of the grain. This method can be used for making paper having a fibrous base with a coating containing hydroxyl-containing water-soluble polymers treated with a crosslinking agent in the form of grains, each grain having a nucleus consisting of a substance inert to the substance forming crosslinks with said hydroxyl-containing water soluble polymers, and an external layer surrounding said nucleus and containing compounds of tetravalent metals selected from the group consisting of titanium, zirconium, hafnium and tin.

Inventors

  • 👤 Yakov E. Dikler
  • 👤 Vladimir E. Guryanov
  • 👤 Boris D. Korolkov

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 20:01
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/775; G03C1/79; C; C08; C08B; C08B31/00; C08B31/003; C08K; C08K3/00; C08K3/01; C08K3/011; C08K9/00; C08K9/02; C09; C09C; C09C3/00; C09C3/06; C09C3/063; C09H; C09H7/00; D; D21; D21H; D21H19/00; D21H19/36; D21H19/38; C01; C01P; C01P2004/00; C01P2004/50; C01P2004/60; C01P2004/61; C01P2004/62; C01P2006/00; C01P2006/80; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/31504; Y10T428/31536; Y10T428/31971; Y10T428/31975; Y10T428/31978; Y10T428/31982; Y10T428/31993

Claims Analysis

Total Claims: 18
Claim 1
Independent Claim 82 words
Paper comprising a fibrous base and a coating applied on said fibrous base containing a hydroxyl-containing water-soluble polymer treated with a crosslinking agent in the form of grains having a nucleus-consisting of a solid carrier and an external layer surrounding said nucleus containing a compound of a tetravalent metal selected from the group consisting of titanium, zirconium, hafnium, and tin, said compound of said tetravalent metal being capable of effecting crosslinking of said polymer and said carrier being inert to said compound.
Claim 2
Dependent Claim 82 words
Paper comprising a fibrous base and a coating applied on said fibrous base containing a hydroxyl-containing water-soluble polymer treated with a crosslinking agent in the form of grains having a nucleus-consisting of a solid carrier and an external layer surrounding said nucleus containing a compound of a tetravalent metal selected from the group consisting of titanium, zirconium, hafnium, and tin, said compound of said tetravalent metal being capable of effecting crosslinking of said polymer and said carrier being inert to said compound.
Claim 3
Dependent Claim 15 words
Paper as claimed in claim 1, wherein a photographic paper base is said fibrous base.
Claim 4
Dependent Claim 14 words
Paper as claimed in claim 1, wherein polyvinyl alcohol is said hydroxyl-containing water-soluble polymer.
Claim 5
Dependent Claim 13 words
Paper as claimed in claim 1, wherein gelatin is said hydroxyl-containing water-soluble polymer.
Claim 6
Dependent Claim 12 words
Paper as claimed in claim 1, wherein starch is hydroxyl-containing water-soluble polymer.
Claim 7
Dependent Claim 23 words
Paper as claimed in claim 1 wherein said water soluble polymer is selected from the group consisting of polyvinyl alcohol, gelatin and starch.
Claim 8
Dependent Claim 24 words
Paper as claimed in claim 1 wherein the size of the nuclei in the grains of the crosslinking agent does not exceed 30 microns.
Claim 9
Dependent Claim 28 words
Paper as claimed in claim 1 wherein the mass of the external layer of the grains of the crosslinking agent is 0.1 to 4.0% of the nucleus mass.
Claim 10
Dependent Claim 16 words
Paper as claimed in claim 1 wherein said compound of a tetravalent metal is α-titanic acid.
Claim 11
Dependent Claim 13 words
Paper as claimed in claim 1, wherein the inert carrier is blanc fix.
Claim 12
Dependent Claim 12 words
Paper as claimed in claim 1 wherein the inert carrier is kaolin.
Claim 13
Dependent Claim 13 words
Paper as claimed in claim 1 wherein the inert carrier is titanium dioxide.
Claim 14
Dependent Claim 13 words
Paper as claimed in claim 1 wherein the inert carrier is carbon black.
Claim 15
Dependent Claim 24 words
Paper as claimed in claim 1 wherein the inert carrier is a mixture of particles of blanc fixe, kaolin, titanium dioxide and carbon black.
Claim 16
Dependent Claim 14 words
Paper as claimed in claim 1 wherein the inert carrier is a dry pigment.
Claim 17
Dependent Claim 25 words
Paper as claimed in claim 1 wherein said compound of a tetravalent metal is a hydrolysis product of a hydrolyzable compound of said tetravalent metal.
Claim 18
Dependent Claim 17 words
Paper as claimed in claim 16 wherein the hydrolyzable compound of a tetravalent metal is titanium tetrachloride.

References Cited (Backward Citations)

US2256853A Cited
US3425896A Cited
US3702779A Cited
US3808038A Cited
US4008116A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1982-03-26 1982-09-25 1983-03-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1986-03-26 1986-09-25 1987-03-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1990-03-26 1990-09-25 1991-03-27 $7700.00 Window Closed / Lapsed

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