US4632730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for increasing the absorption rate of paper
Assignee: Akzo NV
•
Filing: 1985-04-29
•
Granted: 1986-12-30
•
Expires: 2005-04-29
Abstract
Abstract Paper, especially wet- or dry-creped paper, is manufactured with a high rate of absorption of aqueous media by using carboxylic acid esters of carboxylic acids with 8 to 30 carbon atoms and at least one of ethoxylated and/or propoxylated primary and/or secondary alcohols with 12 to 40 C atoms, ethoxylated and/or propoxylated alkyl phenols, ethoxylated and/or propoxylated amines, and ethoxylated and/or propoxylated amides, with a degree of ethoxylation or propoxylation of 3 to 50; and/or by using polyethers obtained from the reaction of long-chain epoxides with 8 to 30 carbon atoms and at least one of ethoxylated and/or propoxylated primary and/or secondary alcohols with 12 to 40 C atoms, ethoxylated and/or propoxylated alkyl phenols, ethoxylated and/or propoxylated amines, and ethoxylated and/or propoxylated amides, with a degree of ethoxylation or propoxylation of 3 to 50.
Inventors
- 👤 Hasan Ulubay
- 👤 Horst Schurmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:47
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/14; D21H17/07
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
81 words
A method for increasing the absorption rate of aqueous media of paper, comprising adding carboxylic acid esters of carboxylic acids with 8 to 30 carbon atoms and at least one member selected from the group consisting of ethoxylated and/or propoxylated primary and/or secondary alcohols with 12 to 40 carbon atoms, ethoxylated and/or propoxylated alkyl phenols, ethoxylated and/or propoxylated amines, and ethoxylated and/or propoxylated amides, with a degree of ethoxylation or propoxylation of 5 to 50, during the manufacture of said paper.
Claim 2
Independent Claim
81 words
A method for increasing the absorption rate of aqueous media of paper, comprising adding carboxylic acid esters of carboxylic acids with 8 to 30 carbon atoms and at least one member selected from the group consisting of ethoxylated and/or propoxylated primary and/or secondary alcohols with 12 to 40 carbon atoms, ethoxylated and/or propoxylated alkyl phenols, ethoxylated and/or propoxylated amines, and ethoxylated and/or propoxylated amides, with a degree of ethoxylation or propoxylation of 5 to 50, during the manufacture of said paper.
Claim 3
Independent Claim
84 words
A method for increasing the absorption rate of aqueous media of paper, comprising adding polyethers, obtained from the reaction of long chain epoxides with 8 to 30 carbon atoms with at least one member selected from the group consisting of ethoxylated and/or propoxylated primary and/or secondary alcohols with 12 to 40 carbon atoms, ethoxylated and/or propoxylated alkyl phenols, ethoxylated and/or propoxylated amines, and ethoxylated and/or propoxylated amides, with a degree of ethoxylation or propoxylation of 3 to 50, during the manufacture of said paper.
Claim 4
Independent Claim
84 words
A method for increasing the absorption rate of aqueous media of paper, comprising adding polyethers, obtained from the reaction of long chain epoxides with 8 to 30 carbon atoms with at least one member selected from the group consisting of ethoxylated and/or propoxylated primary and/or secondary alcohols with 12 to 40 carbon atoms, ethoxylated and/or propoxylated alkyl phenols, ethoxylated and/or propoxylated amines, and ethoxylated and/or propoxylated amides, with a degree of ethoxylation or propoxylation of 3 to 50, during the manufacture of said paper.
Claim 5
Dependent Claim
20 words
Method according to claim 1, wherein said paper is selected from the group consisting of dry-creped paper and wet-creped paper.
Claim 6
Dependent Claim
20 words
Method according to claim 2, wherein said paper is selected from the group consisting of dry-creped paper and wet-creped paper.
Claim 7
Dependent Claim
22 words
Method according to claim 1, wherein the alkyl group of the ethoxylated and/or propoxylated alkyl phenol contains 8 to 16 carbon atoms.
Claim 8
Dependent Claim
22 words
Method according to claim 2, wherein the alkyl group of the ethoxylated and/or propoxylated alkyl phenol contains 8 to 16 carbon atoms.
Claim 9
Dependent Claim
15 words
Method according to claim 1, wherein the carboxylic acid contains 12 to 20 carbon atoms.
Claim 10
Dependent Claim
15 words
Method according to claim 2, wherein the long-chain 1,2-epoxide contains 12 to 18 carbon atoms.
Claim 11
Dependent Claim
29 words
Method according to claim 1, wherein the carboxylic acid ester is added to the paper in an amount of 0.05 to 0.5 wt.% in relation to absolutely dry pulp.
Claim 12
Dependent Claim
27 words
Method according to claim 2, wherein the polyether is added to the paper in an amount of 0.05 to 0.5 wt.% in relation to absolutely dry pulp.
Claim 13
Dependent Claim
20 words
Method according to claim 1, wherein the carboxylic acid ester is added to the hollander, pulper and/or during sheet formation.
Claim 14
Dependent Claim
18 words
Method according to claim 2, wherein the polyether is added to the hollander, pulper and/or during sheet formation.
Claim 15
Dependent Claim
24 words
Method according to claim 1, wherein the carboxylic acid ester is added as a liquid in a compound concentration of more than 80 wt.%.
Claim 16
Dependent Claim
22 words
Method according to claim 2, wherein the polyether is added as a liquid in a compound concentration of more than 80 wt.%.
Claim 17
Dependent Claim
16 words
Method according to claim 2, wherein the polyether is added as an aqueous dispersion or solution.
Claim 18
Dependent Claim
16 words
Method according to claim 1, wherein the degree of ethoxylation or propoxylation is 5 to 15.
Claim 19
Dependent Claim
16 words
Method according to claim 2, wherein the degree of ethoxylation or propoxylation is 5 to 15.
References Cited (Backward Citations)
CA878981A
Cited
US3180786A
Cited
DE1955454A1
Cited
US3637869A
Cited
GB1382467A
Cited
DE2140010A1
Cited
DE2161772A1
Cited
SE402607B
Cited
DE2929512A1
Cited
US4303471A
Cited
DE3322330A1
Cited
US4483741A
Cited
DE3404086A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |