EP0141641A2
Expired / Lapsed
EP
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Process and compositions for sizing paper
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1984-10-30
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Granted: —
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Expires: 2004-10-30
Abstract
Abstract An aqueous sizing composition can be prepared by mixing into water a concentrate that comprises a substantially anhydrous dispersion of a polyelectrolyte in an organic liquid comprising a solution of a reactive size in a hydrophobic solvent.
Inventors
- 👤 Peter Flesher
- 👤 John G. Langley
- 👤 Norma Denise Rosier
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 07:46
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
36 words
A concentrate composition suitable, upon dilution with water, for sizing cellulosic fibres and comprising a substantially anhydrous dispersion of a polyelectrolyte in an organic liquid comprising a solution of a reactive size in a hydrophobic solvent.
Claim 2
Dependent Claim
36 words
A concentrate composition suitable, upon dilution with water, for sizing cellulosic fibres and comprising a substantially anhydrous dispersion of a polyelectrolyte in an organic liquid comprising a solution of a reactive size in a hydrophobic solvent.
Claim 3
Dependent Claim
35 words
A composition according to claim 1 in which the concentration of reactive size is above 20% by weight of the total composition and above 40% by weight of the combined weight of size and solvent.
Claim 4
Dependent Claim
36 words
A composition according to claim 1 in which the concentration of the reactive size is 30 to 85% by weight of the total composition and the weight ratio organic solvent:reactive size is from 1:10 to 1:0.67.
Claim 5
Dependent Claim
20 words
A composition according to any preceding claim in which the weight ratio polyelectrolyte: reactive size is from 1:1 to 1:10.
Claim 6
Dependent Claim
25 words
A composition according to any preceding claim containing, by weight, 1 part solvent, 1 to 3 parts reactive size and 0.5 to 2 parts polyelectrolyte.
Claim 7
Dependent Claim
21 words
A composition according to any preceding claim in which the reactive size is selected from ketene dimer and anhydride reactive sizes.
Claim 8
Dependent Claim
21 words
A composition according to any preceding claim in which the polyelectrolyte is selected from water soluble cationic, anionic and non-ionic polymers.
Claim 9
Dependent Claim
57 words
A composition according to any preceding claim in which the polyelectrolyte is selected from polymers formed from at least one monomer selected from dialkylaminoalkyl acrylates and methacrylates and their acid addition salts and their quaternary ammonium salts, diallyl dialkyl ammonium chlorides acrylamide, acrylic acid, methacrylic acid and 2-acrylamido-2-methyl propane sulphonic acid and from polyamine and polyimine polymers.
Claim 10
Dependent Claim
12 words
A composition according to any preceding claim additionally including an oil-in-water emulsifier.
Claim 11
Dependent Claim
28 words
A composition according to any preceding claim that has been made by adding the reactive size to a substantially anhydrous dispersion of the polyelectrolyte in the hydrophobic liquid.
Claim 12
Dependent Claim
37 words
A composition according to any preceding claim that has been made by forming an aqueous dispersion of the polyelectrolyte in hydrophobic liquid by reverse phase polymerisation, dehydrating the dispersion by azeotroping and then adding the reactive size.
Claim 13
Dependent Claim
35 words
An aqueous composition obtained by dispersing into water a concentrate according to any preceding claim in an amount sufficient to give a reactive size concentration in the water of from 0.01 to 5% by weight.
Claim 14
Dependent Claim
28 words
A method in which cellulosic fibres are sized by treating aqueous cellulosic pulp or cellulosic paper made from such pulp with an aqueous composition according to claim 12.
References Cited (Backward Citations)
No citation records indexed.
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