US4040900A
Expired / Lapsed
US
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Method of sizing paper
Assignee: Ingredion Inc
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Filing: 1976-05-05
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Granted: 1977-08-09
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Expires: 1996-05-05
Abstract
Abstract A size mixture comprising a substituted cyclic dicarboxylic acid anhydride and polyoxyalkylene alkyl or alkyl-aryl ether or the corresponding mono- or di-ester is used to size paper products. In accordance with a preferred embodiment the liquid size mixture is added directly to the paper stock system without prior emulsification.
Inventors
- 👤 Emil D. Mazzarella
- 👤 Leonard J. Wood, Jr.
- 👤 Walter Maliczyszyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:48
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/14; D21H17/15; D21H17/06; D21H17/16; D21H17/20; D21H17/33; D21H17/46; D21H17/53
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
221 words
A method for sizing paper products comprising the steps of 1. providing a paper stock system; 2. forming, in the absence of high shearing forces and under normal pressures, a sizing emulsion consisting essentially of: a. from 80 to 97 parts of substituted cyclic dicarboxylic acid anhydride corresponding to the formula ##STR5## wherein R represents a dimethylene or trimethylene radical and wherein R' is a hydrophobic group containing more than 5 carbon atoms which may be selected from the class consisting of alkyl, alkenyl, aralkyl, or aralkenyl groups; ##STR6## wherein R x is an alkyl radical containing at least 4 carbon atoms and R y is an alkyl radical containing at least 4 carbon atoms, and R x and R y are interchangeable; ##STR7## wherein R x is an alkyl radical containing at least 5 carbon atoms and R y is an alkyl radical containing at least 5 carbon atoms and R x and R y are interchangeable; b. from 3 to 20 parts of a polyoxyalkylene alkyl or polyoxyalkylene alkyl-aryl ether or the corresponding mono- or diester selected from the group consisting of: ##STR8## wherein x and n are integers in the range of 8 to 20; R is an aryl radical; m is an integer in the range of 5 to 20; and i is 0 or 1; and
Claim 2
Independent Claim
221 words
A method for sizing paper products comprising the steps of 1. providing a paper stock system; 2. forming, in the absence of high shearing forces and under normal pressures, a sizing emulsion consisting essentially of: a. from 80 to 97 parts of substituted cyclic dicarboxylic acid anhydride corresponding to the formula ##STR5## wherein R represents a dimethylene or trimethylene radical and wherein R' is a hydrophobic group containing more than 5 carbon atoms which may be selected from the class consisting of alkyl, alkenyl, aralkyl, or aralkenyl groups; ##STR6## wherein R x is an alkyl radical containing at least 4 carbon atoms and R y is an alkyl radical containing at least 4 carbon atoms, and R x and R y are interchangeable; ##STR7## wherein R x is an alkyl radical containing at least 5 carbon atoms and R y is an alkyl radical containing at least 5 carbon atoms and R x and R y are interchangeable; b. from 3 to 20 parts of a polyoxyalkylene alkyl or polyoxyalkylene alkyl-aryl ether or the corresponding mono- or diester selected from the group consisting of: ##STR8## wherein x and n are integers in the range of 8 to 20; R is an aryl radical; m is an integer in the range of 5 to 20; and i is 0 or 1; and
Claim 3
Dependent Claim
67 words
forming a web from the paper stock system; c. water; 4. intimately dispersing said emulsion within the paper stock either before or after formation of said web but prior to passing said web through the drying stage of the paper making operation in an amount sufficient to provide a concentration of the substituted cyclic dicarboxylic acid anhydride of from 0.1 to 2.0%, based on dry fiber weight.
Claim 4
Dependent Claim
67 words
forming a web from the paper stock system; c. water; 4. intimately dispersing said emulsion within the paper stock either before or after formation of said web but prior to passing said web through the drying stage of the paper making operation in an amount sufficient to provide a concentration of the substituted cyclic dicarboxylic acid anhydride of from 0.1 to 2.0%, based on dry fiber weight.
Claim 5
Dependent Claim
18 words
The method of claim 2 wherein the sizing emulsion is formed in situ within the paper stock system.
Claim 6
Dependent Claim
19 words
The method of claim 1 wherein the sizing emulsion is formed prior to introduction into the paper stock system.
Claim 7
Dependent Claim
52 words
The method of claim 3 wherein the size mixture is emulsified with water in a sufficient quantity to yield an emulsion containing the substituted cyclic dicarboxylic acid anhydride in a concentration of from 0.1 to 20%, by weight of the total emulsified size mixture, prior to addition to the paper stock system.
Claim 8
Dependent Claim
27 words
The method of claim 3 wherein the size mixture in the form of an aqueous emulsion is sprayed onto the formed web prior to the drying operation.
Claim 9
Dependent Claim
38 words
The method of claim 1 wherein there is dispersed within the paper stock prior to the conversion of the paper stock into a dry web at least 0.01%, based on dry fiber weight, of a cationic retention agent.
Claim 10
Dependent Claim
52 words
The method of claim 1 wherein the sizing emulsion is formed with a polyoxyalkylene alkyl-phenyl ether selected from the group consisting of: ##STR9## wherein n is an integer in the range of 8 to 20; m is an integer in the range of 5 to 20; and i is 0 or 1.
References Cited (Backward Citations)
US3102064A
Cited
US3821069A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |