Glyoxalation of vinylamide polymer

A technology of vinyl amide and polyvinyl amide, applied in paper, textile and papermaking, non-fibrous pulp addition, etc., can solve problems such as limited application

Active Publication Date: 2009-10-07
BASF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many applications that limit its application due to high VOC content

Method used

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  • Glyoxalation of vinylamide polymer
  • Glyoxalation of vinylamide polymer
  • Glyoxalation of vinylamide polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0143] Determination of critical concentration of polyvinylamide with different Mw

[0144] A set of seven identical vinylamide polymers with different weight average molecular weights were synthesized. The seven polymers are all copolymers of 90% by weight acrylamide and 10% by weight DADMAC. The weight average molecular weights of these seven polymers are shown in the table below.

[0145] Samples A, B, C and D were synthesized by heterogeneous suspension polymerization, and samples E, F and G were synthesized by aqueous solution polymerization.

[0146] The average molecular weight of samples A and B was measured using a DAWN multi-angle light scattering detector with a combined differential refractive index detector. In light scattering experiments, the amount of light scattered at a given angle is proportional to the weight-average molar mass and concentration. A secondary Zimm plot was used to generate molar mass data at a dn / dc (specific refractive index gain) value ...

Embodiment 1

[0183] A vinylamide polymer having a Mw of 100,000 formed from acrylamide and diallyldimethylammonium chloride in a 90 / 10 weight ratio was glyoxalated according to the invention. The glyoxalation reaction was carried out at 2 wt% solids with a concentration of about 1.7 wt% vinylamide polymer. The molar ratio of amide:glyoxal for the glyoxalation reaction is 4:1. The initial viscosity before glyoxalation was 4.05 cp. The viscosity after glyoxalation was 4.75 cp. The reaction was followed by monitoring turbidity. The starting turbidity was 4.4 NTU and the final turbidity was 13.1 NTU.

Embodiment 2

[0185] Example 2 is a glyoxalated polyvinylamide sold under the name BAYSTRENGTH 3000.

[0186] In order to demonstrate the effect of the glyoxalated product produced by the process of the present invention (Example 5) relative to the known glyoxalated vinyl amide polymer (Example 6), the two products were evaluated as dry strength The agent was applied to the paper furnish and resulted in the paper properties measured in Table 6 below.

[0187] The paper was produced on a 2-ply fourdrinier paper machine (15% top ply: 85% bottom ply) with Bellbond at a reel speed of 2100 ft / min. The furnish was 80% Kraft fibres, 20% OCC, 1% solids, furnish loading approximately 350 meq / l, conductivity 3000 microSiemens and pH 5.1 in the headbox.

[0188] Before the mixing paddle pump, the glyoxalated vinyl amide polymer (embodiment 1) and the conventional glyoxalated vinyl amide polymer (comparative example 2) formed by the inventive method were respectively added to In ingredients in thin s...

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Abstract

The present invention is directed to a method for preparing a cellulose reactive adduct of polyvinylamide and a composition resulting from the method. The preparation of the cellulose reactive adduct is carried out close to a Critical Concentration defined herein. When the reaction is run close to this Critical Concentration, the risk of gelation is minimized, consumed glyoxal is maximized, and shelf live is enhanced. Additionally, the glyoxalated vinylamides of the present invention impart improved wet and dry strengthening efficiency to paper and paperboard when compared to adducts disclosedin previously described art.

Description

[0001] This application claims the benefit of US Provisional Application Nos. 60 / 843,156 (filed September 7, 2006) and 60 / 851,188 (filed October 12, 2006), which are hereby incorporated by reference in their entirety. field of invention [0002] The present invention relates to a process for the preparation of cellulose-reactive adducts of polyvinylamides and compositions obtained therefrom. [0003] The polyvinylamide cellulose reactive adduct obtained from the process of the invention is used as a dry and wet strength aid for paper or board and can be applied to wet end cellulose or directly to wet web or cardboard. Background of the invention [0004] Synthetic water-soluble polymers are widely used in practice as wet-end additives to strengthen paper and board. Cellulose-reactive water-soluble vinylamide copolymers are also commonly used as paper strengthening agents. A specific class of vinylamide polymer reinforcement aids includes vinylamide polymers that have been ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/28D21H17/37C08F20/54
Inventor M·赖特
Owner BASF AG
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