US4263094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester-starch sized paper, sizing composition, and process therefor
Assignee: BASF Corp
•
Filing: 1979-07-30
•
Granted: 1981-04-21
•
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
2026-11-03 09:16
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; D21H17/33; D21H17/46; D21H17/53; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/3179; Y10T428/31971; Y10T428/31975; Y10T428/31978
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
A surface-sized cellulosic material consisting of a cellulose-derived paper or paperboard surface sized with a combination of a degraded starch or starch derivative and a water-dispersible polyester, said 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 said polyester in said starch-polyester size is present in a weight ratio of 3 to 300 pounds per ton of paper and said starch is present in said size in a weight ratio of 6 to 600 pounds per ton of paper.
Claim 2
Dependent Claim
114 words
A surface-sized cellulosic material consisting of a cellulose-derived paper or paperboard surface sized with a combination of a degraded starch or starch derivative and a water-dispersible polyester, said 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 said polyester in said starch-polyester size is present in a weight ratio of 3 to 300 pounds per ton of paper and said starch is present in said size in a weight ratio of 6 to 600 pounds per ton of paper.
Claim 3
Dependent Claim
38 words
The article of claim 1 wherein said polyester is the condensation product of 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
14 words
The article of claim 2 wherein said phosphorus acid reactant is ortho phosphoric acid.
Claim 5
Dependent Claim
51 words
The article of claim 3 wherein said polyester is the reaction product of said isophthalic acid, said diethylene glycol, and said ortho phosphoric acid in the respective molar ratio of 0.85, 1.0, and 0.15 and wherein said polyester has an average molecular weight of 10,000 and an acid number of 5.6.
Claim 6
Dependent Claim
14 words
The article of claim 4 wherein said starch is a potato or corn-derived starch.
Claim 7
Dependent Claim
25 words
The article of claim 5 wherein said starch is a degraded starch obtained by enzyme conversion, oxidation, alkaline-hypochlorite treatment or treatment with other oxidizing agents.
Claim 8
Dependent Claim
20 words
The article of claim 6 wherein said starch is degraded to a fluidity of about 18 to about 97 cc.
References Cited (Backward Citations)
US3413139A
Cited
US3983268A
Cited
US3931422A
Cited
US4029885A
Cited
US4098741A
Cited
US4111816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |