Water sensitive hot melt adhesives for nonwoven applications
AssigneeNational Starch and Chemical Investment Holding Corporation
InventorsFrancis Brady, Gary Raykovitz, Paul Puletti, Thomas Kauffman, Jules Schoenberg
Life of this patent
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Abstract
Nonwoven assemblies bonded with water dispersible or sensitive hot melt adhesives comprising 50-100 parts of a graft copolymer of about 40-85% of at least one vinyl monomer and about 15-60% of at least one water soluble polyalkylene oxide polymer, and about 0-50 parts by weight of tackifying resin. The compositions may also be employed as water sensitive binders in the manufacture of the nonwoven. Vinyl acetate is the preferred vinyl monomer whereas ethylene oxide homo- or copolymers are the preferred polyalkylene oxide. The use of tackifying resin is optional and may be undesirable for many of the applications.
Claims16
A process for bonding nonwoven fabric substrates to similar or dissimilar substrates comprising the steps of applying to at least one substrate a molten hot melt adhesive composition, said adhesive having a Tg of -40.degree. to +40.degree. C. comprising 50-100% of a graft copolymer comprising (a) 40-85 weight percent of at least one vinyl monomer and (b) 15-60 weight percent of at least one polyalkylene oxide polymer having a molecular weight greater than 3000 and a polymerized ethylene oxide content of at least 50% by weight, and 0-50 parts by weight of a compatible tackifying resin;
- and bonding another substrate thereto;
- the process being characterized in that the bond of the resulting construction will release when exposed to ambient temperature water.
A process for the production of a nonwoven substrate comprising the step of bonding nonwoven fibers with a binder composition having a Tg of -40.degree. to +40.degree. C. comprising 50-100% of a graft copolymer comprising (a) 40-85 weight percent of at least one vinyl monomer and (b)15-60 weight percent of at least one polyalkylene oxide polymer having a molecular weight greater than 3000 and a polymerized ethylene oxide content of at least 50% by weight and 0-50 parts by weight of a compatible tackifying resin, and bonding another substrate thereto;
- the process being characterized in that the bond of the resulting construction will release when exposed to ambient temperature water.
A process for bonding nonwoven fabric substrates to similar or dissimilar substrates comprising the steps of applying to at least one substrate a molten hot melt adhesive composition, said adhesive having a Tg of -40.degree. to +40.degree. C. comprising 50-70 weight percent of a graft copolymer, said copolymer comprising (a) 40-85 weight percent of at least one vinyl monomer and (b) 15-60 weight percent of at least one polyalkylene oxide polymer having a molecular weight greater than 3000 and a polymerized ethylene oxide content of at least 50% by weight, and 30-50 parts by weight of a compatible tackifying resin, and bonding another substrate thereto;
- the process being characterized in that the bond of the resulting construction will release when exposed to ambient temperature water.
A process for bonding nonwoven fabric substrates to similar or dissimilar substrates comprising the steps of applying to at least one substrate a molten hot melt adhesive composition, said adhesive having a Tg of -40.degree. to +40.degree. C. comprising 50-100% of a graft copolymer wherein the graft copolymer comprises 20-80% vinyl acetate, 5-65% vinyl 2-ethylhexanoate or butyl acrylate and 15-60% of at least one polyalkylene oxide polymer and 0-50% of a compatible tackifying resin, and bonding another substrate thereto;
- the process being characterized in that the bond of the resulting construction will release when exposed to ambient temperature water.
A disposable product containing incorporated therein superabsorbent particulate polymers, wherein the polymers are bonded into the disposable product using a hot melt adhesive having a Tg of -40.degree. to +40.degree. C. and comprising 50-100% by weight of a graft copolymer comprising (a) 40-85 weight percent of at least one vinyl monomer and (b) 15-60 weight percent of at least one polyalkylene oxide polymer having a molecular weight greater than 3000 and a polymerized ethylene oxide content of at least 50% by weight, and 0-50 parts by weight of a compatible tackifying resin;
- the product being characterized in that the bond of the resulting construction will release when exposed to ambient temperature water.
Dependencies are inferred from the claim text.