Patent US4129528A successfully refreshed from Google Patents.
US4129528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamine-epihalohydrin resinous reaction products
Assignee: Akzo NV
•
Filing: 1976-05-11
•
Granted: 1978-12-12
•
Expires: 1996-05-11
Abstract
Abstract Resinous reaction products wherein the hydrohalide salt of a polyamine is condensed with an epihalohydrin provides improved wet strength and improved dry strength to cellulosic substrates such as paper, paperboard, and the like. It has been found that the wet strength and dry strength of paper products can be significantly improved by using a resinous reaction product resulting from the removal of halide ions from the polyamine hydrohalide salt before it is condensed with an epihalohydrin.
Inventors
- 👤 John P. Petrovich
- 👤 Donald N. Van Eenam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:34
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08G73/022
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
42 words
A method for preparing a resinous composition which comprises: A. forming an amine prepolymer containing a hydrohalide, B. removing a substantial amount of the halide ion from the amine prepolymer, and thereafter, C. contacting the substantially halide-free amine prepolymer with an epihalohydrin.
Claim 2
Independent Claim
42 words
A method for preparing a resinous composition which comprises: A. forming an amine prepolymer containing a hydrohalide, B. removing a substantial amount of the halide ion from the amine prepolymer, and thereafter, C. contacting the substantially halide-free amine prepolymer with an epihalohydrin.
Claim 3
Dependent Claim
15 words
A method of claim 1 wherein the amine prepolymer is formed by polymerizing diallylamine hydrohalide.
Claim 4
Dependent Claim
51 words
A method of claim 1 wherein the amine prepolymer is formed from the reaction product of: 1. a dihaloalkane represented by the formula ##STR2## wherein X represents chloro, bromo, or iodo, R is hydrogen, hydroxy or alkyl group having 1 to 4 carbon atoms, and n is 0 to 1, and
Claim 5
Dependent Claim
41 words
a polyalkylenepolyamine represented by the formula H.sub.2 N(C.sub.m H.sub.2m NH).sub.p C.sub.m H.sub.2m NH.sub.2 wherein m is an integer of from 2 to about 15 and p is 0 to 3 in a mole ratio of from about 0.3:1 to about 1:1.
Claim 6
Dependent Claim
41 words
a polyalkylenepolyamine represented by the formula H.sub.2 N(C.sub.m H.sub.2m NH).sub.p C.sub.m H.sub.2m NH.sub.2 wherein m is an integer of from 2 to about 15 and p is 0 to 3 in a mole ratio of from about 0.3:1 to about 1:1.
Claim 7
Dependent Claim
31 words
A method of claim 3 wherein the amine prepolymer is formed from the reaction product of a dihaloalkane and a polyalkylenepolyamine in a mole ratio of about 0.4:1 to about 0.9:1.
Claim 8
Dependent Claim
41 words
A method of claim 3 wherein the substantially halide-free amine prepolymer is contacted with from about 0.8:1 to about 2:1 moles, based on the moles of amine group, of an epihalohydrin selected from the group consisting of epichlorohydrin, epibromohydrin and epiiodohydrin.
Claim 9
Dependent Claim
65 words
A method of claim 1 wherein a substantial amount of the hydrohalide and residual halide is removed from the amine prepolymer by contacting the amine prepolymer with a sufficient amount of an alkali metal hydroxide to react with a substantial amount of the hydrohalide and residual halide at about 50° C. to about 100° C., and thereafter separating the amine prepolymer from alkali metal salts.
Claim 10
Dependent Claim
17 words
A method of claim 6 wherein the amine prepolymer is contacted with a 50% sodium hydroxide solution.
Claim 11
Dependent Claim
39 words
A resinous composition comprising the reaction product of a substantially halide-free polymer of diallylamine which has been prepared from a halide-containing diallylamine prepolymer and from about 0.1 to about 2.0 moles of an epihalohydrin per mole of amine group.
Claim 12
Dependent Claim
39 words
A resinous composition comprising the reaction product of a substantially halide-free polymer of diallylamine which has been prepared from a halide-containing diallylamine prepolymer and from about 0.1 to about 2.0 moles of an epihalohydrin per mole of amine group.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |