US4302283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sizing process and composition
Assignee: Albemarle Corp
•
Filing: 1980-09-02
•
Granted: 1981-11-24
•
Expires: 2000-09-02
Abstract
Abstract Improved paper sizing is obtained by using water soluble salts of substitutes succinic acid having the formula: ##STR1## wherein R' is essentially hydrocarbon group of the formula ##STR2## wherein R is hydrogen or alkyl, at least two R groups being alkyl, and the total number of carbon atoms in R' is from 16 to about 26.
Inventors
- 👤 Sidney M. Blitzer
- 👤 Harry D. Wilder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:38
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/14; D21H17/15; D21H17/16
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
133 words
The method of sizing paper which comprises the step of intimately dispersing within the wet pulp prior to the ultimate conversion of said pulp into a dry web as a sizing agent an effective amount of a system of alum plus alkali metal salt of substituted dicarboxylic acid corresponding to the structural formula ##STR14## wherein R is hydrogen or alkyl, at least two R groups being alkyl, and the total number of carbon atoms in the salt is from 20 to about 30, and wherein the amount of alum is up to about 1.7% by weight on a dry fiber basis and in an amount sufficient to provide superior sizing properties in comparison with succinic acid salts of said formula wherein the total number of carbon atoms in R' is less than 16.
Claim 2
Independent Claim
133 words
The method of sizing paper which comprises the step of intimately dispersing within the wet pulp prior to the ultimate conversion of said pulp into a dry web as a sizing agent an effective amount of a system of alum plus alkali metal salt of substituted dicarboxylic acid corresponding to the structural formula ##STR14## wherein R is hydrogen or alkyl, at least two R groups being alkyl, and the total number of carbon atoms in the salt is from 20 to about 30, and wherein the amount of alum is up to about 1.7% by weight on a dry fiber basis and in an amount sufficient to provide superior sizing properties in comparison with succinic acid salts of said formula wherein the total number of carbon atoms in R' is less than 16.
Claim 3
Dependent Claim
12 words
The method of claim 1, wherein the salt is alkali metal salt.
Claim 4
Dependent Claim
11 words
The method of claim 1, wherein the salt is sodium salt.
Claim 5
Dependent Claim
15 words
The method of claim 2, wherein alkyl groups of R are essentially straight chain groups.
Claim 6
Dependent Claim
66 words
The method of claim 3, wherein rosin size is also intimately dispersed within the wet pulp prior to the ultimate conversion of said pulp into a dry web, the weight ratio of said rosin size to said salt is from about 0.1 to about 10, and the weight ratio of said rosin size plus said salt to said alum is from about 0.2 to about 1.0.
Claim 7
Dependent Claim
25 words
A process according to claim 1, wherein the weight ratio of said sizing agent to said precipitating agent is from about 0.02 to about 1.0.
Claim 8
Dependent Claim
25 words
A process according to claim 1, wherein the weight ratio of said sizing agent to said precipitating agent is from about 0.1 to about 0.5.
Claim 9
Dependent Claim
18 words
A process according to claim 1, wherein the aqueous suspension of paper pulp is also admixed with filler.
Claim 10
Dependent Claim
12 words
A process according to claim 1, wherein the filler is titanium dioxide.
Claim 11
Dependent Claim
31 words
A process according to claim 1, wherein rosin size is also incorporated therein and the weight ratio of said rosin size to said salt is from about 10:1 to about 1:10.
Claim 12
Dependent Claim
49 words
A process according to claim 1, wherein water soluble salt is a mixture of salts having at least two different numbers of carbon atoms per molecule, there being present in the mixture at least 10 percent of salt of each of two different numbers of carbon atoms per molecule.
Claim 13
Dependent Claim
25 words
A process according to claim 1, wherein the pH of said mass is from about 4 to about 6 when the paper sheet is formed.
Claim 14
Dependent Claim
24 words
The process of claim 1, wherein the pH is adjusted to form about 4 to about 6 by the addition of a mineral acid.
Claim 15
Dependent Claim
11 words
The process of claim 1, wherein the mineral acid is HCl.
Claim 16
Dependent Claim
15 words
The process of claim 1, wherein the mineral acid is H 2 SO 4 .
Claim 17
Dependent Claim
116 words
A sized paper comprising a fibrous cellulosic web which has been internally sized with a water soluble salt of substituted succinic acid having the formula ##STR15## wherein R' is a hydrocarbon group of the formula ##STR16## wherein R is hydrogen or alkyl, at least two R groups being alkyl, and the total number of carbon atoms in R' is from 16 to about 26, and with alum, said alum being in an amount up to about 1.7% by weight on a dry fiber basis and in an amount sufficient to provide superior sizing properties in comparison with succinic acid salts of said formula wherein the total number of carbon atoms in R' is less than 16.
Claim 18
Dependent Claim
116 words
A sized paper comprising a fibrous cellulosic web which has been internally sized with a water soluble salt of substituted succinic acid having the formula ##STR15## wherein R' is a hydrocarbon group of the formula ##STR16## wherein R is hydrogen or alkyl, at least two R groups being alkyl, and the total number of carbon atoms in R' is from 16 to about 26, and with alum, said alum being in an amount up to about 1.7% by weight on a dry fiber basis and in an amount sufficient to provide superior sizing properties in comparison with succinic acid salts of said formula wherein the total number of carbon atoms in R' is less than 16.
References Cited (Backward Citations)
US3139373A
Cited
US3821069A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |