US4079043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glyoxal modified poly(beta-alanine) strengthening resins for use in paper
Assignee: Hercules LLC
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Filing: 1976-02-12
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Granted: 1978-03-14
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Expires: 1996-02-12
Abstract
Abstract Novel resins, useful as strengthening resins for imparting dry and temporary wet strength to paper, are disclosed. The resins are prepared by reacting branched water-soluble poly(beta-alanine) with glyoxal.
Inventors
- 👤 Terence W. Rave
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:07
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H21/00; D21H21/14; D21H21/18; D21H21/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A water-soluble resin which comprises the reaction product of a branched water-soluble poly(beta-alanine) having a molecular weight in the range of about 500 to about 10,000 with from about 10 to about 100 mole %, based on the amide repeating units of the poly(beta-alanine) of glyoxal, said poly(beta-alanine) having been prepared by the anionic polymerization of acrylamide in a suitable organic reaction medium inert to the reaction conditions in the presence of a basic catalyst and a free-radical inhibitor.
Claim 2
Dependent Claim
79 words
A water-soluble resin which comprises the reaction product of a branched water-soluble poly(beta-alanine) having a molecular weight in the range of about 500 to about 10,000 with from about 10 to about 100 mole %, based on the amide repeating units of the poly(beta-alanine) of glyoxal, said poly(beta-alanine) having been prepared by the anionic polymerization of acrylamide in a suitable organic reaction medium inert to the reaction conditions in the presence of a basic catalyst and a free-radical inhibitor.
Claim 3
Dependent Claim
12 words
The resin of claim 1 wherein the basic catalyst is sodium hydroxide.
Claim 4
Dependent Claim
12 words
The resin of claim 1 wherein the basic catalyst is sodium t-butoxide.
Claim 5
Dependent Claim
11 words
The resin of claim 1 wherein the free-radical inhibitor is phenyl-beta-naphthylamine.
Claim 6
Dependent Claim
136 words
The process of preparing a glyoxal-modified poly(beta-alanine) which comprises: (a) anionically polymerizing acrylamide in the presence of a basic catalyst and a free-radical inhibitor in a suitable organic reaction medium inert to the reaction conditions to produce branched water-soluble poly(beta-alanine) having a molecular weight in the range of about 500 to about 10,000; (b) dissolving the poly(beta-alanine) in water to provide an aqueous solution having a solids content of about 11 to about 40%; and (c) adding glyoxal in the amount of about 10 to about 100 mole %, based on the amide repeating units of the poly(beta-alanine) and continuing the reaction at a temperature from about 10° C. to about 50° C. until a viscosity increase of about 2 to about 10 units on the Gardner-Holdt scale has taken place, thus producing a glyoxal-modified poly(beta-alanine).
Claim 7
Dependent Claim
136 words
The process of preparing a glyoxal-modified poly(beta-alanine) which comprises: (a) anionically polymerizing acrylamide in the presence of a basic catalyst and a free-radical inhibitor in a suitable organic reaction medium inert to the reaction conditions to produce branched water-soluble poly(beta-alanine) having a molecular weight in the range of about 500 to about 10,000; (b) dissolving the poly(beta-alanine) in water to provide an aqueous solution having a solids content of about 11 to about 40%; and (c) adding glyoxal in the amount of about 10 to about 100 mole %, based on the amide repeating units of the poly(beta-alanine) and continuing the reaction at a temperature from about 10° C. to about 50° C. until a viscosity increase of about 2 to about 10 units on the Gardner-Holdt scale has taken place, thus producing a glyoxal-modified poly(beta-alanine).
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) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |