Superabsorbent water sensitive multilayer construction
View Patent ↗A multilayer construction that includes a first layer that includes water sensitive thermoplastic polymer and a second layer disposed on the first layer, the second layer including superabsorbent polymer.
1. A method of making a multilayer article comprising:
providing a molten water sensitive thermoplastic polymer; and
contacting said molten thermoplastic polymer with an aqueous composition of a water soluble superabsorbent polymer.
2. The method of claim 1 , wherein said multilayer article is in a form selected from the group consisting of fibers, filaments and combinations thereof.
3. The method of claim 1 , wherein said multilayer article is in the form of a film.
4. The method of claim 1 , wherein said superabsorbent polymer composition is contacted to said water sensitive thermoplastic polymer while said water sensitive thermoplastic polymer is at a higher temperature than that of said superabsorbent polymer composition.
5. The method of claim 4 , wherein said water sensitive thermoplastic composition is formed by extrusion.
6. The method of claim 5 , wherein said superabsorbent polymer composition is applied to said water sensitive thermoplastic composition as said water sensitive thermoplastic composition is extruded.
7. The method of claim 4 , comprising the further step of crosslinking said superabsorbent polymer composition.
8. The method of claim 1 , comprising the further step of including a crosslinked polyacrylate in said superabsorbent polymer.
9. The method of claim 1 , comprising the further step of including a crosslinked and at least partially neutralized α,β-ethylenically unsaturated monomer selected from the group consisting of monocarboxylic acid monomers, dicarboxylic monomers, acid anhydride monomers, and combinations thereof in the superabsorbent polymer.
10. The method of claim 1 , comprising the further step of including as the thermoplastic polymer, the reaction product of (a) a polyoxyalkylene glycol diamine having the formula NH 2 —(CH 2 ) x —(OCH 2 —CH 2 ) y —O—(CH 2 ) x —NH 2 , wherein 2≦X≦3 and 1≦Y≦2, and (b) and an acid selected from the group consisting of dicarboxylic acid, dicarboxylic acid ester, and combinations thereof.
11. The method of claim 1 , comprising the further step of including as the thermoplastic polymer, the reaction product of adipic acid and polyoxyalkylene glycol diamine.