US4251402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester-starch sized paper, sizing composition, and process therefor
Assignee: BASF Corp
•
Filing: 1979-07-30
•
Granted: 1981-02-17
•
Expires: 1999-07-30
Abstract
Abstract There is disclosed a cellulosic material such as paper or paperboard surface-sized with an aqueous dispersion of a combination of degraded starch or a starch derivative and a branched-chain, water-dispersible polyester condensation product. Said polyester is derived from the reaction of a dicarboxylic reactant, a diol or polyoxyalkylene glycol, and a phosphorus acid reactant wherein said polyester has a carboxylic acid number of about 5 to about 15 and an average molecular weight of about 4,000 to about 11,000. Mixtures of said starch and said polyester when used to surface-size cellulosic materials impart water resistance thereto.
Inventors
- 👤 Robert B. Login
- 👤 Daniel R. Dutton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:07
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/53; D21H17/21; D21H17/24; D21H17/28
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
An aqueous size composition useful in the coating of cellulosic materials to improve the water resistance thereof comprising water, a degraded starch or starch derivative, and a branched chain, water-dispersible polyester having an average molecular weight of about 4,000 to about 11,000 and a carboxylic acid number of about 5 to about 15, wherein said polyester is the condensation product of a dicarboxylic reactant, a diol or polyoxyalkylene glycol, and a phosphorus acid reactant and wherein said polyester is present in said aqueous size composition in the weight ratio of 4 to 60 parts by weight for each 100 parts by weight of starch solids and said starch in said aqueous size composition is present in a total amount of about 1 part to about 10 parts by weight based on 100 parts total weight of said water, starch, and polyester.
Claim 2
Dependent Claim
141 words
An aqueous size composition useful in the coating of cellulosic materials to improve the water resistance thereof comprising water, a degraded starch or starch derivative, and a branched chain, water-dispersible polyester having an average molecular weight of about 4,000 to about 11,000 and a carboxylic acid number of about 5 to about 15, wherein said polyester is the condensation product of a dicarboxylic reactant, a diol or polyoxyalkylene glycol, and a phosphorus acid reactant and wherein said polyester is present in said aqueous size composition in the weight ratio of 4 to 60 parts by weight for each 100 parts by weight of starch solids and said starch in said aqueous size composition is present in a total amount of about 1 part to about 10 parts by weight based on 100 parts total weight of said water, starch, and polyester.
Claim 3
Dependent Claim
39 words
The composition of claim 1 wherein said polyester is the condensation product of said isophthalic acid, diethylene glycol, and a phosphorus acid reactant selected from the group consisting of phosphorus pentoxide, ortho phosphoric acid, polyphosphoric acid, and mixtures thereof.
Claim 4
Dependent Claim
24 words
The composition of claim 2 wherein said phosphorus acid reactant is ortho phosphoric acid and said polyester has an average molecular weight of 10,000.
Claim 5
Dependent Claim
14 words
The composition of claim 3 wherein said polyester has an acid number of 5.6.
Claim 6
Dependent Claim
23 words
The composition of claim 2 wherein said starch is selected from the group consisting of at least one of potato or corn-derived starches.
Claim 7
Dependent Claim
25 words
The composition of claim 5 wherein said starch is a degraded starch, degraded by enzyme conversion, oxidation, alkaline-hypochloride treatment or treatment with other oxidizing agents.
Claim 8
Dependent Claim
20 words
The composition of claim 6 wherein said starch is degraded to a fluidity of about 18 to about 97 cc.
References Cited (Backward Citations)
US3396149A
Cited
US3441540A
Cited
US3530205A
Cited
US3415788A
Cited
US3931422A
Cited
US3981833A
Cited
US4029885A
Cited
US4098741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |