Patent US2750541A successfully refreshed from Google Patents.
US5234547A
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US
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Creping aid
Assignee: WR Grace and Co Conn
•
Filing: 1992-03-23
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Granted: 1993-08-10
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Expires: 2012-03-23
Abstract
Abstract A method of creping a paper is described which comprises applying to the creping drum prior to the application of the paper web to be creped, a synthetic anionic polymer.
Inventors
- 👤 Paul Knight
- 👤 Ulrich Welkener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:28
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/12; D21H5/1218; B; B31; B31F; B31F1/00; B31F1/12; C; C08; C08G; C08G69/00; C08G69/48; C08G73/00; C08G73/02; C08G73/028; C08G73/0286; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H21/00; D21H21/14; D21H21/146; D21H17/46; D21H17/54; D21H17/56
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
167 words
A method of creping a paper which comprises applying to a heated creping drum, prior to the application of the paper web to be creped, a synthetic anionic polymer having the formula ##STR2## wherein each R 1 individually represents H or a C 1 to C 8 alkyl group, R 2 represents H, --CO 2 X or --CH 2 CO 2 X, R 3 represents --CO 2 X, or R 2 and R 3 together represent --CO--O--CO--, R 4 represents --CONH 2 or --CON(CH 3 ) 2 , R 5 represents a C 1 to C 6 alkyl group, X represents H, NH, or an alkali metal, m is an integer from 3 to about 100, x, y and z individually represent relative mole ratios of each monomer such that x and y are from 1 to 9 and z is from 0 to 5 in an amount sufficient to adhere the paper web to the creping drum and creping the paper web from said creping drum.
Claim 2
Independent Claim
167 words
A method of creping a paper which comprises applying to a heated creping drum, prior to the application of the paper web to be creped, a synthetic anionic polymer having the formula ##STR2## wherein each R 1 individually represents H or a C 1 to C 8 alkyl group, R 2 represents H, --CO 2 X or --CH 2 CO 2 X, R 3 represents --CO 2 X, or R 2 and R 3 together represent --CO--O--CO--, R 4 represents --CONH 2 or --CON(CH 3 ) 2 , R 5 represents a C 1 to C 6 alkyl group, X represents H, NH, or an alkali metal, m is an integer from 3 to about 100, x, y and z individually represent relative mole ratios of each monomer such that x and y are from 1 to 9 and z is from 0 to 5 in an amount sufficient to adhere the paper web to the creping drum and creping the paper web from said creping drum.
Claim 3
Dependent Claim
18 words
A method according to claim 1 in which a release agent is also applied to the creping drum.
Claim 4
Dependent Claim
17 words
A method according to claim 1 in which the anionic polymer is an acrylate or methacrylate polymer.
Claim 5
Dependent Claim
18 words
A method according to claim 3 in which the anionic polymer is derived from acrylic or methacrylic acid.
Claim 6
Dependent Claim
31 words
A method according to claim 1 in which the polymer is a copolymer of acrylic and/or methacrylic acid with acrylamide and/of methacrylamide and, optionally, an alkyl acrylate or alky(meth) acrylate ester.
Claim 7
Dependent Claim
20 words
A method according to claim 5 in which the mole ratio of acid to amide is from 1:5 to 5:1.
Claim 8
Dependent Claim
24 words
A method according to claim 1 in which the polymer has a molecular weight from 5,000 to 150,000, as determined by gel permiation chromatography.
Claim 9
Dependent Claim
19 words
A method according to claim 2 in which the release agent is an imidazoline or a mineral oil defoamer.
References Cited (Backward Citations)
US3926716A
Cited
US4064213A
Cited
US4406737A
Cited
US4176107A
Cited
US4528316A
Cited
US4886579A
Cited
US4883564A
Cited
US4994146A
Cited
US5094717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |