초록 ▼

A process for producing powdered chemically crosslinked poly(alkylene oxide) of molecular weight of at least 100,000 which comprises contacting poly(alkylene oxide) with a suitable crosslinking agent in the presence of a free radical catalyst, and a liquid medium containing a solvent-nonsolvent mixt

A process for producing powdered chemically crosslinked poly(alkylene oxide) of molecular weight of at least 100,000 which comprises contacting poly(alkylene oxide) with a suitable crosslinking agent in the presence of a free radical catalyst, and a liquid medium containing a solvent-nonsolvent mixture for said poly(alkylene oxide) wherein the non-solvent portion constitutes at least 35% and up to 100% by weight of the liquid medium, at a temperature and for a time sufficient to crosslink said poly(alkylene oxide).

대표청구항 ▼

A process for producing powdered crosslinked poly (ethylene oxide) with a crosslinking agent represented by the formula O �2=CHC－A)nX │ (R)a wherein A is nitrogen or oxygen; n has a value of 2 or more, R is hydrogen, an alkyl of 1-6 carbon atoms or aryl of 6 to 14 carbon atoms; X can be a (substitut

A process for producing powdered crosslinked poly (ethylene oxide) with a crosslinking agent represented by the formula O �2=CHC－A)nX │ (R)a wherein A is nitrogen or oxygen; n has a value of 2 or more, R is hydrogen, an alkyl of 1-6 carbon atoms or aryl of 6 to 14 carbon atoms; X can be a (substituted or unsubstituted polyvalent) residue of an organic compound selected from the group consisting of －CyH2Y －wherein Y is an integer of 1 to 50, －CxH2x (OCxH2x)m －wherein x is an integer of 2 to 4 and m is an integer of 1 to 1,000 or more, a polyvalent cycloalkyl of 5 to 7 ring carbon atoms, a polyvalent arylene of 6 to 14 ring carbon atoms, CH3 │ polyvalent -ff3, di or trivalent glyceryl, trimethylol propane, the divalent, trivalent and tetravalent residues of pentaerythritol, the polyvalent residues of the epoxidized fatty acid glycerides, and the divalent, trivalent or higher polyvalent residues of carbohydrates; with the proviso that when A is oxygen, a is 0 and when A is nitrogen, a is 1; in the presence of a free radical catalyst and a liquid medium containing a solvent-nonsolvent mixture for the poly(ethylene oxide) wherein the nonsolvent portion constitutes at least about 35% and up to 100% by weight of the liquid medium, at a temperature sufficiently elevated to effect cross-linking.