US4981557A
Expired / Lapsed
US
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Temporary wet strength resins with nitrogen heterocyclic nonnucleophilic functionalities and paper products containing same
Assignee: Procter and Gamble Co
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Filing: 1989-04-26
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Granted: 1991-01-01
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Expires: 2009-04-26
Abstract
Abstract Temporary wet strength resins, and paper products containing same, having a molecular weight of from about 20,000 to about 200,000, most preferably from about 30,000 to aboug 95,000 having the fomula: ##STR1## wherein: A is 0 or ##STR2## and X is --O--, --NH--, or --NCH 3 --, and R is a substituted or unsubstituted aliphatic group; Y 1 and Y 2 are independently --H, --CH 3 , or a halogen; W is a nonnucleophilic, water-soluble nitrogen heterocyclic moiety; and Q is a cationic monomeric unit. The mole percent of "a" ranges from about 30% to about 70%, preferably from about 45% to about 55%; the mole percent of "b" ranges from about 30% to about 70%, preferably from about 45% to about 55%; and the mole percent of "c" ranges from about 1% to about 40%, most preferably from about 2% to about 5%.
Inventors
- 👤 David W. Bjorkquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:31
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/62; C; C08; C08F; C08F226/00; C08F246/00; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45; D21H17/455; D21H21/00; D21H21/14; D21H21/18; D21H21/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
144 words
A paper product comprising a sheet of fibrous materials and from about 0.005% to about 5.0% of a water soluble, temporary wet strength resin, said resin comprising a polymer characterized by the substantially complete absence of nucleophilic functionalities and having the formula: ##STR13## wherein: A is ##STR14## and X is --O--, --NH, or --NCH 3 --, and R is a substituted or unsubstituted aliphatic groups; Y 1 and Y 2 are independently --H, --CH 3 or a halogen; W is a nonnucleophilic, water-soluble nitrogen heterocyclic moiety; O is a cationic monomeric unit; the mole percent of a is from about 30% to about 70%, the mole percent of b is from about 30% to about 70%, and the mole percent of c is from about 1% to about 40%; and said polymer has an average molecular weight of between about 30,000 and about 200,000.
Claim 2
Dependent Claim
144 words
A paper product comprising a sheet of fibrous materials and from about 0.005% to about 5.0% of a water soluble, temporary wet strength resin, said resin comprising a polymer characterized by the substantially complete absence of nucleophilic functionalities and having the formula: ##STR13## wherein: A is ##STR14## and X is --O--, --NH, or --NCH 3 --, and R is a substituted or unsubstituted aliphatic groups; Y 1 and Y 2 are independently --H, --CH 3 or a halogen; W is a nonnucleophilic, water-soluble nitrogen heterocyclic moiety; O is a cationic monomeric unit; the mole percent of a is from about 30% to about 70%, the mole percent of b is from about 30% to about 70%, and the mole percent of c is from about 1% to about 40%; and said polymer has an average molecular weight of between about 30,000 and about 200,000.
Claim 3
Dependent Claim
68 words
A paper product as in claim 1, wherein a is from about 45% to about 55%, b is from about 45% to about 55%, and c is from about 2% to about 20%, said sheet having an initial wet tensile strength/dry tensile strength ratio of at least about 10% and a wet tensile decay rate after 90 minutes soaking in neutral pH water of at least about 70%.
Claim 4
Dependent Claim
144 words
A paper product comprising a sheet of fibrous materials and from about 0.005% to about 5.0% of a water soluble, temporary wet strength resin, said resin comprising a polymer characterized by the substantially complete absence of nucleophilic functionalities and having the formula: ##STR15## wherein: A is ##STR16## and X is --O--, --NH, or --NCH 3 --, and R is a substituted or unsubstituted aliphatic group; Y 1 and Y 2 are independently --H, --CH 3 or a halogen; W is a nonnucleophilic, water-soluble nitrogen heterocyclic moiety; O is a cationic monomeric unit; the mole percent of a is from about 30% to about 70%, the mole percent of b is from about 30% to about 70%, and the mole percent of c is from about 1% to about 40%; and said polymer has an average molecular weight of between about 30,000 and about 200,000.
Claim 5
Dependent Claim
144 words
A paper product comprising a sheet of fibrous materials and from about 0.005% to about 5.0% of a water soluble, temporary wet strength resin, said resin comprising a polymer characterized by the substantially complete absence of nucleophilic functionalities and having the formula: ##STR15## wherein: A is ##STR16## and X is --O--, --NH, or --NCH 3 --, and R is a substituted or unsubstituted aliphatic group; Y 1 and Y 2 are independently --H, --CH 3 or a halogen; W is a nonnucleophilic, water-soluble nitrogen heterocyclic moiety; O is a cationic monomeric unit; the mole percent of a is from about 30% to about 70%, the mole percent of b is from about 30% to about 70%, and the mole percent of c is from about 1% to about 40%; and said polymer has an average molecular weight of between about 30,000 and about 200,000.
Claim 6
Dependent Claim
33 words
A paper product as in claim 3, wherein a is from about 45% to about 55%, b is from about 45% to about 55%, and c is from about 2% to about 20%.
Claim 7
Dependent Claim
56 words
A paper product as in claim 2, wherein W is a vinyl pyrrolidone and X is --NH or --NCH 3 , said sheet having an initial wet tensile strength/dry tensile strength ratio of at least about 12% and a wet tensile decay rate after 90 minutes soaking in neutral pH water of at least about 70%.
Claim 8
Dependent Claim
42 words
A paper product as in claim 5, wherein said sheet has an initial wet strength/dry tensile strength ratio of at least about 12% and a wet tensile decay rate after 90 minutes soaking in neutral pH water of at least about 80%.
Claim 9
Dependent Claim
21 words
The paper product of claim 1, wherein said resin comprises less than 3 mole % of monomer units having nucleophilic functionalities.
Claim 10
Dependent Claim
22 words
The paper product of claim 5, wherein said resin comprises less than about 1 mole % of monomer units having nucleophilic functionalities.
Claim 11
Dependent Claim
22 words
The paper product of claim 6, wherein said resin comprises less than about 1 mole % of monomer units having nucleophilic functionalities.
Claim 12
Dependent Claim
19 words
The paper product of claim 8, wherein said resin has 0 mole % of monomer units having nucleophilic functionalities.
References Cited (Backward Citations)
US3079296A
Cited
US3093506A
Cited
US3096228A
Cited
US3740391A
Cited
US3772407A
Cited
US3556932A
Cited
US3317370A
Cited
US3410828A
Cited
US3819555A
Cited
US4233411A
Cited
EP0133699A2
Cited
US4605702A
Cited
US4675394A
Cited
US4603176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |