Powdery water-absorbing polymers with fine particles bound by thermoplastic adhesives
AssigneeEvonik Stockhausen GmbH
InventorsFrank Loeker, Heinz Bremus, Scott Smith
Life of this patent
Estimating the term…
Abstract
A process for producing and a powdery water-absorbing polymers comprising: about 0.01 to 20 wt. % of a fine particle with a particle size of less than about 200 μm; about 0.001 to 10 wt. % of a thermoplastic adhesive; and about 60 to 99.998 wt. % of a water-absorbing polymer particle with a particle size of about 200 μm and above, wherein the powdery water-absorbing polymers have: a flow value (FFC) within the range from about 1 to 13, and/or a dust portion of at most about 6 are disclosed. Also disclosed are a transport process, a composite, chemical products, and a use of a thermoplastic adhesive.
Claims24
Treated water-absorbing polymer particles comprising:
- from about 0.01 to about 20 percent by weight of the polymer of a fine particle with a particle size of less than about 200 μm;
- from about 0.001 to less than 0.3 percent by weight of the polymer of a thermoplastic adhesive;
- and
- from about 60 to about 99.998 percent by weight of the polymer of a water-absorbing polymer particle with a particle size of about 200 μm and above, wherein
- wherein the treated water-absorbing polymer particles are prepared by a production process and the fine particles are bound to the surface of the water-absorbing polymer particles by the thermoplastic adhesive during the production process for the treated water-absorbing polymer particles, and the treated water-absorbing polymer particles have either
- a flow value (FFC) comprising from about 1 to about 13 according to the Determination of the FFC Value set forth in the present application, or
- a dust portion comprising at most about 6 according to the Determination of the Dust Portion method set forth in the present application.
Treated water-absorbing particles obtainable by a process comprising the steps of:
- providing from about 0.01 to about 20 percent by weight of a fine particle with a particle size of less than about 200 μm;
- providing from about 0.001 to about 0.3 percent by weight of a thermoplastic adhesive;
- providing from about 60 to about 99.998 percent by weight of a water-absorbing polymer particle with a particle size of about 200 μm and above;
- and
- wherein the treated water-absorbing polymer particles are prepared by a production process, and contacting the fine particle, the thermoplastic adhesive, and the water-absorbing polymer particle with each other at a temperature comprising from about 120 to about 250° C. during the production process for the treated water-absorbing polymer particles.
A process for producing treated water-absorbing polymer particles comprising the steps of:
- providing from about 0.01 to about 20 percent by weight of a fine particle with a particle size of less than about 200 μm;
- providing from about 0.001 to less than 0.3 percent by weight of a thermoplastic adhesive;
- providing from about 60 to about 99.998 percent by weight of a water-absorbing polymer particle with a particle size of about 200 μm and above;
- and
- contacting the fine particle, the thermoplastic adhesive, and the water-absorbing polymer particle with each other at a temperature comprising from about 120 to about 250° C.
- wherein the treated water-absorbing polymer particles have either
- a flow value (FFC) comprising from about 1 to about 13 according to the Determination of the FFC Value set forth in the present application, or
- a dust portion comprising at most about 6 according to the Determination of the Dust Portion method set forth in the present application.
Dependencies are inferred from the claim text.