Polymeric binders having specific peel and cure properties and useful in making creped webs
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a polymer binder and specific technology, applied in the field of polymer binders having specific, can solve the problems of ineffectiveness, inability to emulsify polymer binders, unacceptable odor, etc., and achieve the effect of reducing production breaks and high softness and absorbency
Inactive Publication Date: 2005-04-07
GOLDSTEIN JOEL ERWIN +1
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[0007] Binders having the properties described above are excellent candidates for use in crepe, especially DRC, processes. When used in making paper products, they should adhere to the creping dr...
Problems solved by technology
Known emulsion polymeric binders, that are free of alkylphenol ethoxylates, have not been effective in creping processes, especially DRC processes, because they do not provide the necessary...
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[0027] Emulsion polymerization of vinyl acetate, ethylene, and N-methylol acrylamide was carried out in presence of various surfactant systems in a one-gallon stirred, stainless steel reaction vessel equipped with a jacket. In Run 1, reaction vessel was charged initially with 883.5 g of deionized water, 126.75 g of Disponil FES 32 IS, 25.625 g of Tergitol 15-S-20, 0.91 g of sodium citrate, 3.5 g of 50% aqueous citric acid, 2.3 g of 5% aqueous ferric ammonium sulfate and 312.0 g of vinyl acetate. While stirring, 240.0 g of ethylene was introduced below the surface of the liquid in the reaction vessel in order that the interpolymers would have a vinyl acetate:ethylene ratio of about 80:20. The reaction vessel was heated to 50° C. Upon equilibration, the following four aqueous solutions were intermittently added to the reaction vessel over the course of the reaction (on a delay basis); 15% sodium formaldehyde sulfoxylate (SFS), 3.0% t-butylhydroperoxide (t-bhp), 1246.0 g of vinyl aceta...
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Abstract
This invention is directed to APE-free polymer binders formed by emulsion polymerization and having specific peel and cure properties. The APE-free polymeric binders have a peel value, when adhered to a heated metal surface, of 35% to 200% of the peel value shown by a standard APE-based polymer binder control (i.e., AIRFLEX® 105 vinyl acetate-ethylene polymer emulsion) and exhibit a cure profile such that at least 55% cure is achieved within 30 seconds at a temperature required for cure. Wet tensile strength is used as a measure of cure. The peel value is determined by a modified release and adhesion test. Binders having the peel and cure properties described herein can be considered for use in crepe processes, especially DRC processes.
Description
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation of U.S. application Ser. No. 10 / 025,114, filed on Dec. 19, 2001.BACKGROUND OF THE INVENTION [0002] Crepe processes, especially double recrepe (DRC) processes, have been used to produce paper products, such as paper towels and wipes, with specific properties. The DRC process involves creping a base sheet or nonwoven web on a drum, printing a polymeric binder on one side of the sheet, flash drying the binder, creping the base sheet on a drum again, printing a polymeric binder on the other side of the base sheet, flash drying the binder, and then creping the base sheet a third time. The base sheet is printed while traveling through gravure nip rolls. Various crepe processes and binding materials used in the processes are known. Examples of such processes are disclosed in U.S. Pat. No. 3,879,257, U.S. Pat. No. 3,903,342, U.S. Pat. No. 4,057,669, U.S. Pat. No. 5,674,590, and U.S. Pat. No. 5,776,306. [0003] ...
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IPC IPC(8): C08F2/24
CPCY10T428/24446C08F2/24Y10T428/31935
Inventor GOLDSTEIN, JOEL ERWINPANGRAZI, RONALD JOSEPH
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