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Self-crosslinked polyer introduced in non-woven fabric adhesive for improving wet strength of premoistured napkin

A technology of polymers and adhesives, applied in the direction of grafted polymer adhesives, adhesive types, textiles, etc., can solve the problems of expensive, poor absorption, non-biodegradable, etc.

Inactive Publication Date: 2004-08-11
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spunbond or meltblown webs are more expensive than airlaid webs, are not biodegradable, and are less absorbent
These disadvantages were the driving force behind the development of air-laid webs with the necessary strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Preparation of AAEM-modified VAE / MAMD polymers

[0049] The following were added to a one gallon steel reaction kettle: 745.0 g deionized water, 69.4 g 30% aqueous solution of disodium laureth sulfosuccinate (Aerosol A-102), 13.9 g sodium dodecylbenzenesulfonate ( Rhodapex DS-10), 13.9 g of a 30% aqueous solution of sodium ethylene sulfonate, 2.1 g of a 5% aqueous solution of ferrous ammonium sulfate, 8.1 g of a 50% aqueous solution of citric acid, 0.7 g of sodium citrate, and 1442.0 g of vinyl acetate. The reactor was heated to 32° C., 295 g of ethylene was added, and then 7.3 g of 5% sodium erythorbate aqueous solution was added. Add 2.6% t-BHP aqueous solution at a rate of 0.5 ml / min, and add 5% sodium erythorbate aqueous solution at a rate of 0.70.5 ml / min. When initiation started, 245.95 g of 31.74% MAMD in water was added at a rate of 1.7 ml / min over 5 minutes. Then the temperature was raised to 80°C after 78 minutes, and MAMD was slowly added in 50 mi...

Embodiment 2

[0065] Post-addition of NMA Polymer and MAMD Polymer to Example 1 Polymer

[0066] NMA polymer and MAMD polymer having a weight average molecular weight of 10,000 were mixed with the polymer of Example 1 at various levels before it was applied to the airlaid web. Tables 1 and 2 show the dry and wet tensile strength test results of the bonded webs.

[0067] % NMA polymer

[0068] % MAMD polymer

[0069] The data in Tables 1 and 2 show that the dry tensile strength remains unchanged, while the wet tensile strength is significantly improved when NMA polymers or blends of MAMD polymers and AAEM-modified VAE binders are used as binders. Tensile Strength. It is only necessary to use as little as 2.5% of NMA polymer or MAMD polymer to show improved effect.

Embodiment 3

[0071] Post-addition of MAMD polymer to AIRFLEX 192 VAE adhesive

[0072] MAMD polymer was blended with AIRFLEX 192 VAE binder at various levels before the blend was applied to the airlaid web. MAMD polymers were prepared at two different temperatures, 30°C and 55°C. Tables 3 and 4 show the dry and wet tensile strength test results of the bonded webs.

[0073] % MAMD polymer (at 30

[0074] % MAMD polymer (at 55

[0075] The data in Table 3 show that the addition of MAMD polymer produced at 30°C improves dry and wet tensile strength. The data in Table 4 show that the addition of MAMD polymer produced at 55°C improves dry tensile strength while wet tensile strength remains unchanged. The MAMD polymer prepared at 30°C had a higher molecular weight compared to the MAMD polymer prepared at 55°C.

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Abstract

This invention is directed to an aqueous polymeric binder composition that is useful in improving the wet strength of pre-moistened wipes. The binder composition comprises a blend or mixture of two components. One component is a water dispersible polymer capable of binding together the fibers composing a nonwoven web. The other component is an aqueous solution or dispersion of a polymer comprised predominantly of self-crosslinking monomer(s).

Description

technical field [0001] The present invention relates to a polymer binder for nonwoven fabrics comprising self-crosslinking polymers and the use of the binder to improve the wet strength of premoistened wipes. Background technique [0002] Premoistened cleaning wipes are well known and known as wet wipes, towelettes, and the like. They include substrates (eg, nonwoven webs) that are pre-moistened with a lotion (eg, an aqueous lotion). Pre-moistened wipes are typically supplied in folded, stacked, sheets, or perforated rolls that are intended to be used one at a time. There are two types of containers used to deliver pre-moistened wipes – hand containers or buckets and pop-up containers. In a hand-held container, the trailing edge of the towel drawn from the container meets the leading edge of the next towel. This makes it easier to remove subsequent towels from the bucket. In pop-up containers, however, the towels are still in roll form. The ends of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M13/224C08L33/26C08L51/06D04H1/587D04H1/64
CPCY10T442/2303Y10T442/2525C08L51/06C08L33/26Y10T442/652Y10T442/2787Y10T442/60C08L2312/00D04H1/641D04H1/587D04H1/64C08L2666/24C08L2666/02D10B2401/06
Inventor J·E·戈德斯泰恩R·J·庞格拉滋N·拉尼尔C·L·丹尼尔斯
Owner WACKER CHEM GMBH