Wet strength resins

• US 4,537,657 A
• Filed: 10/22/1984
• Issued: 08/27/1985
• Est. Priority Date: 08/26/1983
• Status: Expired due to Term

• Current Assignee: Hercules Incorporated (Ashland Global Holdings, Inc.)
• Original Assignee: Hercules Incorporated (Ashland Global Holdings, Inc.)
• Inventors: Keim, Gerald I.
• Primary Examiner(s): Chin, Peter
• Application Number:
  US06/663,105
• Time in Patent Office: 309 Days
• Field of Search: 162/164.3, 162/164.6, 162/168.2, 525/430, 525/435, 524/608, 524/845, 528/342
• US Class Current: 162/164.3
• CPC Class Codes: C08G 69/48 Polymers modified by chemical after-treatment
• CPC Class Codes: C08G 71/02 Polyureas
• CPC Class Codes: D21H 17/55 Polyamides; Polyaminoamides; Polyester-amides
• CPC Class Codes: D21H 17/57 Polyureas; Polyurethanes

Abstract

Disclosed are novel wet strength resins for paper. The resins are produced by reacting an epihalohydrin, such as epichlorohydrin, with an aminopolyamide-polyureylene intermediate derived by reacting methylbisaminopropylamine with oxalic acid or a diester of oxalic acid and with urea.

Claims

1. A paper product having wet and dry strength and improved repulpability comprising sheeted cellulose fibers treated with from about 0.2 to about 3% by weight, based on dry weight of fibers, of a water-soluble, cationic thermosetting resin derived by reacting methylbisaminopropylamine with (a) oxalic acid or a lower alkyl diester of oxalic acid and (b) urea to form an aminopolyamide-polyureylene containing tertiary amine groups, the mole ratio of (a) to (b) being from about 0.1:

1 to about 10;

1 and the mole ratio of methybisaminopropylamine to (a) plus (b) being from 0.9;

1 to about 1.2;

1 and then reacting the intermediate in aqueous solution with from about 1 mole to about 1.5 moles of epihalohydrin per mole of tertiary amine groups present in said intermediate.

2. The paper product of claim 1 wherein the epihalohydrin is epichlorohydrin.

3. The paper product of claim 2 wherein the mole ratio of (a) to (b) is about 0.25:

1 to about 4;

1.

4. The paper product of claim 3 wherein (a) is oxalic acid.

5. The paper product of claim 3 wherein (a) is dimethyl oxalate or diethyl oxalate.