Patent US4614759A successfully refreshed from Google Patents.
US4614759A
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Surface sizing agents for paper
Assignee: Bayer AG
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Filing: 1985-08-05
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Granted: 1986-09-30
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Expires: 2005-08-05
Abstract
Abstract Surface sizing agents for paper containing aqueous or aqueous-alcoholic alkali metal, amine or ammonium salt solutions of copolymers of maleic anhydride and diisobutylene and, if appropriate, a vinyl monomer of the formula <IMAGE> I in which R designates H, -CH3, -C2H5, -OR2, -OCOCH3, <IMAGE> or -CH2-O-COCH3, R1 designates H or -CH3 and R2 designates alkyl, the anhydride groups of the copolymers being bis-esterified to the extent of 25-90 mol % with primary aliphatic monoalcohols with 1 to 12 C atoms.
Inventors
- 👤 Gunter Sackmann
- 👤 Ulrich Beck
- 👤 Heinz Baumgen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:53
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/14; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/42; D21H17/43
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
Surface sizing agents for paper containing aqueous or aqueous-alcoholic alkali metal, amine or ammonium salt solutions of copolymers of maleic anhydride and diisobutylene and, if appropriate, a vinyl monomer of the formula ##STR5## in which R designates H, --CH 3 , --C 2 H 5 , --OR 2 , --OCOCH 3 , ##STR6## or --CH 2 --O--COCH 3 , R 1 designates H or --CH 3 and R 2 designates alkyl, the anhydride groups of the copolymers being bis-esterified to the extent of 25-90 mol % with primary aliphatic monoalcohols with 1 to 12 C atoms.
Claim 2
Dependent Claim
96 words
Surface sizing agents for paper containing aqueous or aqueous-alcoholic alkali metal, amine or ammonium salt solutions of copolymers of maleic anhydride and diisobutylene and, if appropriate, a vinyl monomer of the formula ##STR5## in which R designates H, --CH 3 , --C 2 H 5 , --OR 2 , --OCOCH 3 , ##STR6## or --CH 2 --O--COCH 3 , R 1 designates H or --CH 3 and R 2 designates alkyl, the anhydride groups of the copolymers being bis-esterified to the extent of 25-90 mol % with primary aliphatic monoalcohols with 1 to 12 C atoms.
Claim 3
Dependent Claim
23 words
Surface sizing agents according to claim 1, characterised in that the vinyl monomer is isobutylene, styrene, α-methylstyrene, allyl alcohol or isobutyl vinyl ether.
Claim 4
Dependent Claim
36 words
Surface sizing agents according to claim 1, characterised in that methanol, ethanol, n-propanol, isopropanol, isobutanol, n-butanol, sec.-butanol, n-pentanol, isoamyl alcohol, n-hexanol, n-octanol, n-dodecanol and 2-ethylhexanol or mixtures of these alcohols are employed as primary aliphatic monoalcohols.
Claim 5
Dependent Claim
17 words
Surface sizing agents according to claim 1, characterised in that they contain urea or a urea derivative.
Claim 6
Dependent Claim
33 words
Surface sizing agents according to claim 1, characterised in that they contain urea or an N-mono- or N-di-C 1 -C 4 -alkyl- or an N-mono- or N-di-C 1 -C 4 -hydroxy-alkyl-substituted urea derivative.
Claim 7
Dependent Claim
32 words
Surface sizing agents according to claim 1, characterised in that they contain 10-200% by weight of urea or urea derivative, based on the weight of the alkali metal, amine or ammonium salts.
Claim 8
Dependent Claim
32 words
Surface sizing agents according to claim 1, characterised in that they contain 20-100% by weight of urea or urea derivative, based on the weight of the alkali metal, amine or ammonium salts.
References Cited (Backward Citations)
US4152312A
Cited
US4359325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |