Patent US4152312A successfully refreshed from Google Patents.
US4152312A
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Paper-sizing agents
Assignee: Bayer AG
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Filing: 1974-12-05
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Granted: 1979-05-01
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Expires: 1994-12-05
Abstract
Abstract Anionic sizes for paper or a paper-like material. Substantially equimolecular copolymers of maleic acid anhydride and diisobutylene are esterified to form the corresponding semi-esters. From 10 to 100 mol-% of the anhydride groups are reacted with an aliphatic or cycloaliphatic alcohol. At least 50 mol-% of the formed carboxylic groups are neutralized with alkali, ammonia or aliphatic amines.
Inventors
- 👤 Gunter Sackmann
- 👤 Wulf von Bonin
- 👤 Friedhelm Muller
- 👤 Gunter Kolb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:38
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/42; D21H17/43; C; C08; C08F; C08F10/00; C08F22/00; C08F22/04; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
An anionic size for paper or a paper-like material comprising an aqueous or aqueous-alcoholic alkali, aliphatic amine or ammonium salt solution of a substantially equimolecular copolymer consisting of maleic acid anhydride and diisobutylene wherein from 10 to 100 mol-% of the anhydride groups are esterified with a linear or branched aliphatic monoalcohol containing 1 to 20 carbon atoms or with a cycloaliphatic monoalcohol containing 5 to 6 carbon atoms to form the corresponding semi-ester.
Claim 2
Dependent Claim
74 words
An anionic size for paper or a paper-like material comprising an aqueous or aqueous-alcoholic alkali, aliphatic amine or ammonium salt solution of a substantially equimolecular copolymer consisting of maleic acid anhydride and diisobutylene wherein from 10 to 100 mol-% of the anhydride groups are esterified with a linear or branched aliphatic monoalcohol containing 1 to 20 carbon atoms or with a cycloaliphatic monoalcohol containing 5 to 6 carbon atoms to form the corresponding semi-ester.
References Cited (Backward Citations)
US2378629A
Cited
US2725367A
Cited
US2930775A
Cited
US3322713A
Cited
US3706704A
Cited
US3598778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |