Patent US4198269A successfully refreshed from Google Patents.
US4198269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary ammonium salts of epihalohydrin polymers as additives for fibrous cellulosic materials
Assignee: Dow Chemical Co
•
Filing: 1979-03-09
•
Granted: 1980-04-15
•
Expires: 1999-03-09
Abstract
Abstract Properties of fibrous materials, e.g., wet and dry strength of paper, are significantly improved by incorporating a cationic polyether into a fibrous material such as pulp. The polyether bears ammonium salt groups exemplified by the formula: ##STR1## wherein R 1 and R 2 are individually hydrogen, hydrocarbyl such as alkyl, hydroxyhydrocarbyl, or hydrocarbylamino; E is individually ##STR2## or E and R 1 are collectively ##STR3## wherein R is hydrogen or alkyl, R 3 is hydroxyl, halogen, hydrogen or hydrocarbyl, R 4 is hydrogen or hydrocarbyl; and A.sup.⊖ is an anion of an ammonium salt. Such polyethers also function as retention aids for sizing agents and dyes and as antistatic agents.
Inventors
- 👤 Syamalarao Evani
- 👤 George R. Killat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:12
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/53; C; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/329; C08G65/333; C08G65/33303; C08G65/33306
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A composition comprising cellulosic fibers and a polyether having repeating monomeric units represented by the formula: ##STR23## wherein each R 1 and R 2 are individually hydrogen, hydrocarbyl, hydroxyhydrocarbyl or aminohydrocarbyl wherein amino is a secondary or tertiary amino; each E is individually a monovalent hydrocarbon radical bearing an epoxy group or a group or groups capable of being converted to an epoxy group or E and R 1 are collectively a propylene or substituted propylene radical wherein the terminal substituents are C 1 -C 3 alkyl and the b-carbon substituents are hydroxy, halogen, hydrocarbyl, or hydroxyhydrocarbyl; Y is alkylene and A.sup.⊖ represents any anion common to conventional ammonium salts, said polyether being present in an amount sufficient to improve the wet strength of a web formed from the cellulosic fiber.
Claim 2
Dependent Claim
131 words
A composition comprising cellulosic fibers and a polyether having repeating monomeric units represented by the formula: ##STR23## wherein each R 1 and R 2 are individually hydrogen, hydrocarbyl, hydroxyhydrocarbyl or aminohydrocarbyl wherein amino is a secondary or tertiary amino; each E is individually a monovalent hydrocarbon radical bearing an epoxy group or a group or groups capable of being converted to an epoxy group or E and R 1 are collectively a propylene or substituted propylene radical wherein the terminal substituents are C 1 -C 3 alkyl and the b-carbon substituents are hydroxy, halogen, hydrocarbyl, or hydroxyhydrocarbyl; Y is alkylene and A.sup.⊖ represents any anion common to conventional ammonium salts, said polyether being present in an amount sufficient to improve the wet strength of a web formed from the cellulosic fiber.
Claim 3
Dependent Claim
31 words
The composition of claim 1 wherein the amount is in the range from about 0.0005 to about 1 weight percent of the polyether based on the weight of the cellulosic fibers.
Claim 4
Dependent Claim
11 words
The composition of claim 2 wherein the cellulosic fiber is pulp.
Claim 5
Dependent Claim
9 words
A sheet formed from the composition of claim 3.
Claim 6
Dependent Claim
24 words
The composition of claim 1 which also contains from about 0.1 to about 1 milliequivalent of an anionic polymer per milliequivalent of the polyether.
Claim 7
Dependent Claim
14 words
The composition of claim 5 wherein the anionic polymer is a partially hydrolyzed polyacrylamide.
Claim 8
Dependent Claim
17 words
The composition of claim 5 wherein the anionic polymer is a partially hydrolyzed Mannich product of polyacrylamide.
References Cited (Backward Citations)
US3428680A
Cited
US3625684A
Cited
US3640766A
Cited
US3753931A
Cited
US3746678A
Cited
US3824158A
Cited
US3864288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-15 | 1983-10-15 | 1984-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-15 | 1987-10-15 | 1988-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-15 | 1991-10-15 | 1992-04-15 | $7700.00 | Window Closed / Lapsed |