US3821069A
Expired / Lapsed
US
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Process of sizing paper with a reaction product of maleic anhydride and an internal olefin
Assignee: Indopco Inc
•
Filing: 1973-01-02
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Granted: 1974-06-28
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Expires: 1993-01-02
Abstract
Abstract A method of sizing paper in which the paper is sized with the reaction product of maleic anhydride and an internal olefin.
Inventors
- 👤 O Wurzburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:37
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/14; D21H17/15; D21H17/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
18 words
The method of claim 1 in which the sizing agent is in the form of an aqueous emulsion.
Claim 2
Dependent Claim
75 words
A paper product having intimately dispersed within the wet pulp thereof, prior to its conversion into a dry web, a sizing agent which comprises the reaction product of maleic acid anhydride with an internal olefin corresponding to Rx -CH2-CH CH - CH2 -Ry wherein Rx is an alkyl radical containing at least four carbon atoms and Ry is an alkyl radical containing at least four carbon atoms, in sufficient amount to size the said paper.
Claim 3
Dependent Claim
93 words
A paper product having intimately dispersed within the wet pulp thereof, prior to its conversion into a dry web, (a) a sizing agent which comprises the reaction product of maleic acid anhydride with an internal olefin corresponding to Rx -CH2-CH CH -CH2 -Ry wherein Rx is an alkyl radical containing at least four carbon atoms and Ry is an alkyl radical containing at least four carbon atoms, in sufficient amount to size the said paper and (b) at least 0.025 percent, based on the dry weight of the pulp, of a cationic agent.
Claim 4
Dependent Claim
37 words
The paper product of claim 4, in which said cationic agent is selected from the group consisting of alum, aluminum chloride, long chain fatty amines, substituted polyacrylamide, animal glue, polyamide polymers, cationic resins and cationic starch derivatives.
Claim 5
Independent Claim
103 words
The method of sizing paper which comprises the steps of intimately dispersing within the wet pulp, prior to the ultimate conversion of said pulp into a dry web, (a) a sizing agent which comprises the reaction product of maleic acid anhydride with an internal olefin corresponding to Rx -CH2-CH CH - CH2 -Ry wherein Rx is an alkyl radical containing at least four carbon atoms and Ry is an alkyl radical containing at least four carbon atoms, in sufficient amount to size the said paper and (b) at least 0.025 percent, based on the weight of the dry pulp, of a cationic agent.
Claim 6
Dependent Claim
36 words
The method of claim 6, in which said cationic agent is selected from the group consisting of alum, aluminum chloride, long chain fatty amines, substituted polyacrylamide, animal glue, polyamide polymers, cationic resins and cationic starch derivatives.
Claim 7
Dependent Claim
24 words
The method of claim 6, in which the sizing agent has been emulsified with a surfactant prior to its dispersion within the wet pulp.
Claim 8
Dependent Claim
29 words
The method of claim 6, in which the sizing agent is the reaction product of maleic acid anhydride with an internal olefin selected from octadecene-9, tetradecene-7, hexadecene-7 and eicodecene-11.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |