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RESEARCH DISCLOSURE FOR VINYLCAPROLACTAM CONTAINING POLYMERS IN
WATER SOLUBLE PACKAGING APPLICATIONS
Delayed release water-soluble films containing vinylcaprolactam copolymers.
Water-soluble packaging is a convenient means of delivering detergent into a laundry wash cycle. The timing of
the delivery of the contents is dependent on the physical properties of the packaging material, where the water
temperature dissolution plays an important role. Thus a typical film for packaging liquid detergent is required to be
soluble during the warm wash cycle.
Such an approach might also be extended further to a "2 in 1" product which, in addition to initially delivering
detergent, also delivers a fabric conditioner. However, the release of the latter would be delayed to occur close to
the cold rinse cycle. This could be addressed by incorporating the fabric conditioner in a material which has
enhanced solubility in cold and not hot water.
Disclosed are two materials with the potential to provide packaging films which will remain intact at high wash
temperatures but dissolve in cold rinse temperatures. The two ISP polymers considered for this application were
the vinylcaprolactam copolymers Advantage® HC-37 (terpolymer of vinylcaprolactam, vinylpyrrolidone and
dimethylyaminoethyl methacrylate supplied as a 37% solids in ethanol solution) and Aquaflex® SF-40 (terpolymer
of vinylcaprolactam, vinylpyrrolidone and dimethylyaminopropyl methacrylamide supplied as a 40% solids in
CAS Registry Number: 102972-64-5; 64-17-5 Aquaflex® SF-40
CAS Registry Number: 64-17-5
In both products the vinylcaprolactam portion of the polymer makes them viable film-forming polymers for the
packaging application described above. Vinylcaprolactam exhibits inverse solubility with temperature. Hence the
solubility of polymers containing vinylcaprolactam in water decreases as temperature increases above its cloud
point*. Materials that are fully soluble at room temperature may become partially insoluble...