US3983268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for surface sizing paper
Assignee: BASF SE
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Filing: 1974-11-11
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Granted: 1976-09-28
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Expires: 1994-11-11
Abstract
Abstract Process for the manufacture of surface-sized papers by impregnating a paper with a solution containing a water-soluble salt of a random polymer based on α-olefins and ethylenically unsaturated acids and a compound of the formula: ##EQU1## wherein R is alkyl, aryl or a radical of the formula: ##EQU2## and R 1 and R 2 each independently denotes H, R or a radical of the formula: R -- O-- CH.sub.2 -- and drying the impregnated paper. Very well sized papers are obtained which show alkali resistance and filler compatibility.
Inventors
- 👤 Emil Scharf
- 👤 Herbert Naarmann
- 👤 Fritz Reichel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:47
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/42; D21H17/43; C; C08; C08K; C08K3/00; C08K3/30; C08K5/00; C08K5/16; C08K5/20; C09; C09J; C09J123/00; C09J123/02; D21H17/03; D21H17/05; D21H17/07; D21H17/35; C08L; C08L2666/00; C08L2666/28; C08L2666/36; C08L2666/54
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A process for the manufacture of surface-sized paper by impregnating paper with an aqueous solution containing 0.1 to 5% by weight of salts of random copolymers obtained by copolymerization of a. from 50 to 90% by weight of α-olefins of from 2 to 12 carbon atoms and b. from 50 to 10% by weight of acrylic acid, methacrylic acid or mixtures thereof and neutralization thereof to give copolymers having K values of from 20 to 40, and from 0.1 to 20% by weight of a compound of the formula: ##EQU3##where R is a group selected from alkyl, aryl and radicals of the formula: ##EQU4##and R 1 and R 2 each independently denotes H, R or a radical of the formula: R -- O -- CH.sub.2 -- and drying the impregnated paper.
Claim 2
Dependent Claim
131 words
A process for the manufacture of surface-sized paper by impregnating paper with an aqueous solution containing 0.1 to 5% by weight of salts of random copolymers obtained by copolymerization of a. from 50 to 90% by weight of α-olefins of from 2 to 12 carbon atoms and b. from 50 to 10% by weight of acrylic acid, methacrylic acid or mixtures thereof and neutralization thereof to give copolymers having K values of from 20 to 40, and from 0.1 to 20% by weight of a compound of the formula: ##EQU3##where R is a group selected from alkyl, aryl and radicals of the formula: ##EQU4##and R 1 and R 2 each independently denotes H, R or a radical of the formula: R -- O -- CH.sub.2 -- and drying the impregnated paper.
Claim 3
Dependent Claim
65 words
A process as set forth in claim 1, wherein the salt of the random copolymer is obtained by copolymerization of (a), (b) and, as addition comonomers, (c) up to 30% by weight of non-basic polymerizable compounds selected from the group consisting of acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, C 1-4 alkyl esters of acrylic and methacrylic acids, vinyl esters of C 2-4 alkanoic acids and vinyl chloride.
Claim 4
Dependent Claim
34 words
A process as set forth in claim 1, wherein the random copolymer is obtained by solution polymerization in a primary or secondary C 1-4 alcohol or alcohol mixture at from 60° to 130° C.
Claim 5
Dependent Claim
21 words
A process as set forth in claim 1, wherein the aqueous solution contains urea as the compound of the formula: ##STR8##5.
Claim 6
Dependent Claim
36 words
A process as set forth in claim 1, wherein the paper is additionally impregnated with from 0.005 to 0.5% of cation by weight based on the weight of the paper of aluminum(III) salts or iron(III) salts.
Claim 7
Dependent Claim
32 words
A process as set forth in claim 1 wherein said compound is selected from the group consisting of urea, dimethyl acetamide, N-dimethyl urea, ethylene urea, propylene urea, dimethoxymethylol urea and dimethylol urea.
Claim 8
Dependent Claim
28 words
A process as set forth in claim 6 wherein the amount of salts of random copolymers contained in said aqueous solution is from 0.4 to 3% by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |