US3755070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper sized with carboxy-functional silicones
Assignee: Dow Silicones Corp
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Filing: 1971-08-19
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Granted: 1973-08-28
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Expires: 1991-08-19
Abstract
Abstract A sizing agent for paper is disclosed which is a siloxane copolymer containing about 0.1 to 50 mole percent of carboxyfunctional siloxane units. Paper sized with this siloxane has enhanced resistance to wetting. Sizing can be accomplished by either internal sizing processes (wet end) or surface sizing processes (dry end).
Inventors
- 👤 A Bey
- 👤 J Heffel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:03
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/59; C; C08; C08G; C08G77/00; C08G77/04; C08G77/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
30 words
A paper as defined in claim 1 wherein the siloxane consists essentiallY of about 90 to 99 mole percent of (CH3)2SiO units, and about 1 to 10 mole percent of
Claim 2
Dependent Claim
30 words
A paper as defined in claim 1 wherein the siloxane consists essentially of about 90 to 99 mole percent of (CH3)2SiO units, and about 1 to 10 mole percent of
Claim 3
Dependent Claim
80 words
In a process of internally sizing paper which includes the step of adding the size to the paper pulp at the wet end before the formation of the web, the improvement comprising employing as the size a siloxane copolymer consisting essentially of about 50 to 99.9 mole percent of RnSiO(4 n)/2 units wherein R is a hydrocarbon or a substituted hydrocarbon radical and n has a value of from 0 to 3, and about 0.1 to 50 mole percent of
Claim 4
Dependent Claim
30 words
A process as defined in claim 4 wherein the siloxane consists essentially of about 90 to 99 mole percent of (CH3)2SiO units, and about 1 to 10 mole percent of
Claim 5
Dependent Claim
30 words
A process as defined in claim 4 wherein the siloxane consists essentially of about 90 to 99 mole percent of (CH3)2SiO units and about 1 to 10 mole percent of
References Cited (Backward Citations)
US3338943A
Cited
US3438807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |