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US 4,537,807 AGranted
Binder for pre-moistened paper products
AssigneeBorden, Inc.
InventorsLock-Lim Chan, Patrick W. Lau
Life of this patent
Estimating the term…
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AssigneeBorden, Inc.
InventorsLock-Lim Chan, Patrick W. Lau
Estimating the term…
A premoistened towelette or wiper type paper product having high wet strength when stored in an acidic pH medium and during usage and lower wet strength when immersed in a neutral or alkaline pH medium for disposal in conventional sewage systems comprising a non-woven fibrous web which is treated with an improved polymeric binder comprising a copolymer of glyoxal and polyvinyl alcohol which maintains high wet strength when stored for sustained periods of time in acidic pH wetting medium conventionally used for external cleansing of the human body and during usage and yet which will readily break-up during flushing. This instant invention also comprises a method of treating non-woven fibrous webs with the improved glyoxalated polyvinyl alcohol copolymer binder and drying prior to wetting in an acidic, e.g. boric acid medium.
A pre-moistened paper product characterized by having high initial wet strength when wetted with a solution having an acid pH and yet which has substantially lower wet strength when disposed of in a neutral or alkaline pH solution comprising a sheet of non-woven fibrous webs which are bonded together with a binder comprising a copolymer of glyoxal and polyvinyl alcohol, and which is subsequently wetted with an aqueous acid solution to form a bonded sheet of pre-moistened paper.
A process for preparing a pre-moistened paper product which has high wet strength when wetted with a solution having an acid pH and yet which has substantially lower wet strength when disposed in a neutral or alkaline pH solution comprising the steps of:
In a process of preparing a pre-moistened paper product having high wet strength in aqueous acid solution and low-wet strength in a solution having a neutral or alkaline pH by the steps of treating a non-woven fibrous web with a binder and subsequently wetting the binder treated web with aqueous acid solution wherein the improvement comprises the steps of treating the web with a copolymer binder solution of glyoxalated polyvinyl alcohol and then drying the web prior to wetting with aqueous acid solution.
Dependencies are inferred from the claim text.