Antimicrobial nonwoven wet wipe bonded with a cationic binder
An anti-microbial, non-woven technology, applied in the directions of non-woven fabrics, textiles and papermaking, detergent compounding agents, etc., can solve the problems such as the application of anti-microbial non-woven wet wipes that are not disclosed.
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[0008] The components and method of making an antimicrobial nonwoven wet wipe bonded with a nonionic VAE adhesive according to the present invention will now be discussed in detail. Percentages of materials recited herein are by weight unless the context indicates otherwise.
[0009] VAE copolymer
[0010] Unless otherwise stated, the weight percentages of the monomers mentioned herein are based on the total weight of all monomers in the polymerization reaction used to make the VAE copolymer, and the weight percentages of the monomers add up to 100% in each case.
[0011] The VAE copolymers used as adhesives according to the invention comprise polymerized units of vinyl acetate, ethylene, N-methylol functional monomer and (meth)acrylamide, ie acrylamide and / or methacrylamide. Vinyl acetate is typically copolymerized in an amount of at least 65 wt%, or at least 70%, and up to 94.5 wt%, or up to 85%. Ethylene is typically copolymerized in an amount of at least 5 wt%, or at le...
Embodiment
[0043] Measurement of Tg
[0044] The glass transition temperature (Tg) of the copolymer was determined by differential scanning calorimetry (DSC) using a Mettler-Toledo DSC1 dynamic differential scanning calorimeter according to ASTM D3418-82 as the starting temperature at a heating rate of 10 °C per minute . Onset of glass transition was evaluated in the second heating cycle.
[0045] Measurement of Viscosity-Brookfield
[0046] The Brookfield viscosities of the copolymer dispersions and adhesive compositions were measured using a Brookfield Viscometer Model LVD with a #3 spindle at 60 rpm at 25°C unless otherwise stated. The viscosity of polyvinyl alcohol is the Hoeppler viscosity of a 4% by weight aqueous solution measured according to DIN 53015 at 20°C.
[0047] The following vinyl acetate ethylene dispersions copolymerized with NMA and acrylamide were prepared and tested:
Embodiment 2
[0053] The following ingredients were mixed together: 811.5 g of 10% polyvinyl alcohol-co-vinylamine aqueous solution (88:12 vinyl alcohol:vinylamine molar ratio, 4 wt% aqueous solution viscosity 4-6 mPa.s) and 100.0 g deionized water . The pH of the mixture was adjusted to 3.5 using 33.8 g of a 50 wt % aqueous phosphoric acid solution, and then 2.1 g of a 5 wt % aqueous ammonium ferrous sulfate solution was added to the mixture. This mixture was added to a one gallon (3.8 L) stainless steel pressure reactor that had been purged with nitrogen, and 1100 g of vinyl acetate was added with stirring (200 rpm).
[0054] The reactor was purged with ethylene, agitation was increased to 1000 rpm, and 245 g of ethylene was added to the reactor. The temperature was then raised to 32°C and 7.3 g of a 4.75 wt% aqueous sodium erythorbate solution (pH adjusted to 4.5 with 50% phosphoric acid) was added to the reactor. A 1.50 wt% hydrogen peroxide aqueous solution and a 4.75 wt% sodium eryt...
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Abstract
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