초록 ▼

A superabsorbent, thermoplastic polymeric composition comprising: (A) from about 86 to about 98 percent by weight, based on the total weight of the composition, of a poly(oxyethylene) diol soft segment having a weight average molecular weight in the range of from about 5,000 to about 50,000; and (B)

A superabsorbent, thermoplastic polymeric composition comprising: (A) from about 86 to about 98 percent by weight, based on the total weight of the composition, of a poly(oxyethylene) diol soft segment having a weight average molecular weight in the range of from about 5,000 to about 50,000; and (B) from about 2 to about 14 percent by weight, based on the total weight of the composition, of a hard segment which has a melting point above ambient temperature and below the temperature at which decomposition of either the composition or the soft segment takes place, is essentially insoluble in water, and phase separates from the soft segment, said hard segment being selected from the group consisting of polyurethanes, polyamides, polyesters, polyureas, and combinations thereof; wherein the soft and hard segments are covalently bound together by means of urethane, amide, ester, or secondary urea linkages or combinations thereof. The compositions are especially well suited for the preparation of nonwoven webs by meltblowing, coforming and spunbonding processes.

대표청구항 ▼

A method of preparing a superabsorbent, thermoplastic polymeric composition which comprises: (A) reacting a first compound with a second compound at a temperature of from about 50 to about 200 degrees C. for a time sufficient to effect essentially complete reaction; and (B) reacting with the product

A method of preparing a superabsorbent, thermoplastic polymeric composition which comprises: (A) reacting a first compound with a second compound at a temperature of from about 50 to about 200 degrees C. for a time sufficient to effect essentially complete reaction; and (B) reacting with the product from step A a third compound at a temperature of from about 80 to about 200 degrees C. for a time sufficient to obtain a melt flow rate of less than about 1,000 g per 10 minutes; in which said first compound is a difunctional poly(oxyethylene) having a weight average molecular weight of from about 5,000 to about 50,000; said second compound is an aliphatic, cycloaliphatic, aromatic, or heterocyclic compound having two functional groups which are reactive with the functional groups of said first compound; the mole ratio of said second compound to said first compound is in the range of from about 2 to about 100; said third compound is an aliphatic, cycloaliphatic, aromatic, heterocyclic, or polymeric compound having two functional groups which are reactive with the functional groups of said second compound; the reaction product of said first compound with said second compound, excluding excess second compound, is from about 86 to about 98 percent by weight of the final composition; and said third compound plus the excess of said second compound are from about 2 to about 14 percent by weight of the final composition; in which the functional groups of said second compound and said third compound independently are selected from the group consisting of hydroxy, carboxy, amino, epoxy, imino, and isocyanate groups, with the selection of all such functional groups being such that said superabsorbent, thermoplastic polymeric composition contains linkages selected from the group consisting of urethane, amide, ester, and secondary urea linkages; and the melt flow rate is determined at a temperature of 195 degrees C., under a 2.16 kg load, and with an orifice diameter of 2.0955 0.0051 mm.