Patent US4088030A successfully refreshed from Google Patents.
Patent US4333795A successfully refreshed from Google Patents.
US4333795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical compositions useful as paper sizing agents and method of making same
Assignee: Solvay Solutions UK Ltd
•
Filing: 1980-04-07
•
Granted: 1982-06-08
•
Expires: 2000-04-07
Abstract
Abstract Stable aqueous dispersions which are useful as one-shot sizing agents for paper, i.e. which do not require the separate addition of a flocculating agent, are prepared by combining a rosin dispersion, aluminum sulfate, and an alkali in a prescribed manner. The dispersions may also contain an added stabilizer such as a starch derivative, hydroxyethyl cellulose, or polyvinyl pyrrolidone if desired. These compositions can be used for either internal or external sizing.
Inventors
- 👤 Peter C. Street
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:27
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/62
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
41 words
A stable aqueous chemical composition which is suitable for use as a one-sheet sizing agent for paper, which comprises a rosin dispersion component, aluminum sulphate, and optionally an alkali, the pH of said composition being from about 3.0 to about 5.0.
Claim 2
Dependent Claim
41 words
A stable aqueous chemical composition which is suitable for use as a one-sheet sizing agent for paper, which comprises a rosin dispersion component, aluminum sulphate, and optionally an alkali, the pH of said composition being from about 3.0 to about 5.0.
Claim 3
Dependent Claim
12 words
A composition according to claim 1 wherein the pH is below 4.7.
Claim 4
Dependent Claim
16 words
A composition according to claim 1 wherein the pH is from about 3.5 to about 4.2.
Claim 5
Dependent Claim
12 words
A composition according to claim 1 wherein the alkali is sodium hydroxide.
Claim 6
Dependent Claim
16 words
A composition according to claim 1 wherein the rosin component is a non-fortified free-rosin-containing aqueous dispersion.
Claim 7
Dependent Claim
16 words
A composition according to claim 1 wherein the rosin component is a fortified free-rosin-containing aqueous dispersion.
Claim 8
Dependent Claim
32 words
A composition according to claim 1 which also comprises at least one stabilizing component selected from the group consisting of cationic starches, nonionic starches, hydroxyethyl, cellulose, polyvinyl pyrrolidone, and corn starch acetate.
Claim 9
Dependent Claim
19 words
A composition according to claim 1 wherein the dry weight ratio of the rosin component:aluminum suphate:alkali is about 1:2:0.2.
Claim 10
Independent Claim
100 words
A method of manufacturing of an aqueous chemical composition which is suitable for use as a one-shot sizing agent for paper, which comprises the steps of: a. combining a rosin dispersion component and aluminum sulphate under continuous high speed agitation; b. optionally, adjusting the pH of the resultant mixture to between about 3.0 to about 5.0 with an alkali, under lower speed agitation; c. continuing the lower speed agitation for a time sufficient to break up any flocs formed; and d. homogenizing the mixture so that it will substantially all pass a 40-mesh screen; whereby a stable dispersion is obtained.
Claim 11
Independent Claim
100 words
A method of manufacturing of an aqueous chemical composition which is suitable for use as a one-shot sizing agent for paper, which comprises the steps of: a. combining a rosin dispersion component and aluminum sulphate under continuous high speed agitation; b. optionally, adjusting the pH of the resultant mixture to between about 3.0 to about 5.0 with an alkali, under lower speed agitation; c. continuing the lower speed agitation for a time sufficient to break up any flocs formed; and d. homogenizing the mixture so that it will substantially all pass a 40-mesh screen; whereby a stable dispersion is obtained.
Claim 12
Dependent Claim
17 words
A method according to claim 9 wherein the pH is adjusted to between about 3.5 and 4.2.
Claim 13
Dependent Claim
12 words
A method according to claim 9 wherein the alkali is sodium hydroxide.
Claim 14
Dependent Claim
19 words
A method according to claim 9 wherein the aluminum sulphate is added in the form of an aqueous solution.
Claim 15
Dependent Claim
20 words
A method according to claim 9 wherein the aluminum sulphate is added in the form of solid powdered aluminum sulphate.
Claim 16
Dependent Claim
16 words
A method according to claim 9 wherein the rosin component is a non-fortified free-rosin-containing aqueous dispersion.
Claim 17
Dependent Claim
16 words
A method according to claim 9 wherein the rosin component is a fortified free-rosin aqueous dispersion.
Claim 18
Dependent Claim
19 words
A method according to claim 9 wherein the dry weight ratio of the rosin component:aluminum sulphate:alkali is about 1:2:0.2.
Claim 19
Dependent Claim
50 words
A method according to claim 9 which comprises the additional step of combining the rosin dispersion component with at least one stabilizing component selected from the group consisting of cationic starches, nonionic starches, hydroxyethyl cellulose, polyvinyl pyrrolidone, and corn starch acetate prior to combining the resultant mixture with aluminum sulphate.
Claim 20
Dependent Claim
24 words
A method according to claim 17 wherein the mixture of the rosin dispersion component and the stabilizing component is added to the aluminum sulphate.
Claim 21
Dependent Claim
24 words
A method according to claim 17 wherein the aluminum sulphate is added to the mixture of the rosin dispersion component and the stabilizing component.
Claim 22
Dependent Claim
31 words
A method of sizing paper by a one-shot process which comprises adding the composition of claim 1 to a cellulosic, or other fibre, stock from which a web is subsequently made.
Claim 23
Dependent Claim
31 words
A method of sizing paper by a one-shot process which comprises adding the composition of claim 7 to a cellulosic, or other fibre, stock from which a web is subsequently made.
Claim 24
Dependent Claim
26 words
A method of sizing paper by a one-shot process which comprises applying the composition of claim 1 to a pre-formed web of cellulosic or other fibres.
Claim 25
Dependent Claim
26 words
A method of sizing paper by a one-shot process which comprises applying the composition of claim 7 to a pre-formed web of cellulosic or other fibres.
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) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |