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AssigneeKimberly-Clark Worldwide, Inc.
InventorsPavneet Singh Mumick, Yihua Chang, James Hongxue Wang
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The present invention is directed to a novel process of making N-isopropyl acrylamide (NiPAm) polymers based upon the reaction of poly(acrylic acid) and N-isopropylamine. The disclosed method of the present invention uses polyacrylic acid as a starting material to synthesize NiPAm polymers. In one embodiment, the present invention discloses a condensation reaction of an intermediate salt to form homopolymers, copolymers and terpolymers of N-isopropyl acrylamide (NiPAm) with acrylic acid and/or alkyl acrylates in a molten state, which is adaptable to a continuous reactive extrusion process. Binder compositions, water-dispersible products and thermoformable articles containing the NiPAm polymers are also disclosed.
A method of making a polymer comprising:
A polymer containing N-isopropyl acrylamide structural units, said polymer produced by a continuous extrusion method, said method comprising:
A fibrous substrate comprising:
A water-dispersible product containing at least one fibrous substrate, wherein the fibrous substrate comprising:
The water-dispersible product of claim 29, wherein the copolymer further comprises N-tert-butylacrylamide structural units.
A thermoformable article comprising a polymer containing at least one N-isopropyl acrylamide structural unit, said polymer produced by a continuous extrusion method, said method comprising:
Dependencies are inferred from the claim text.