초록 ▼

A water-insoluble hydrophilic gel comprising: (A) about 30 to about 90% of a hydrophilic (a) polymer of identical or different water-soluble mono-olefinic monomers, or (b) copolymer of said water-soluble monomers with 1 to 70% of water-insoluble, identical or different mono-olefinic monomers, which

A water-insoluble hydrophilic gel comprising: (A) about 30 to about 90% of a hydrophilic (a) polymer of identical or different water-soluble mono-olefinic monomers, or (b) copolymer of said water-soluble monomers with 1 to 70% of water-insoluble, identical or different mono-olefinic monomers, which polymer or copolymer is cross-linked with (B) about 10 to about 70% of a terminal diolefinic hydrophobic macromer having a molecular weight from about 400 to about 8000.

대표청구항 ▼

A controlled, sustained release composition comprising (a) a pharmaceutically, insecticidally or herbicidally effective agent in an amount at least sufficient for the total dosage during a treatment period, and (b) a water-insoluble hydrophilic gel comprising the crosslinked copolymerization product

A controlled, sustained release composition comprising (a) a pharmaceutically, insecticidally or herbicidally effective agent in an amount at least sufficient for the total dosage during a treatment period, and (b) a water-insoluble hydrophilic gel comprising the crosslinked copolymerization product of (A) about 30 to about 90% by weight of said gel of (a) a water-soluble monoolefinic monomer, or mixture of said monomers, or (b) a water-soluble monomer, or mixture of said monomers with 1 to 50% by weight of total monomers of a water-insoluble monoolefinic monomer, or mixture of said water-insoluble monomers, with (B) about 10 to about 70% by weight of said gel of a terminal diolefinic hydrophobic macromer having a molecular weight from about 400 to about 8000, said macromer having the formula [Figure] wherein R1 is a polycondensate chain having a molecular weight from about 200 to about 8000, which is the residue of a poly(propylene oxide) or poly(tetramethylene oxide) glycol having ether linkages; R2 is hydrogen, methyl or －CH2COOR4, wherein R4 is hydrogen or an alkyl group with up to 10 carbon atoms; R3 is hydrogen or COOR4, with the proviso that at least one of R2 and R3 is hydrogen; X is oxa,－COO－, or －CONR5－wherein R5 is hydrogen or alkyl with up to 5 carbon atoms and Y is a direct bond or the radical －R6－Z1－CO－NH－R7－NH－CO－Z2－, wherein R6 is linked to X and represents branched or linear alkylene with up to 7 carbon atoms; Z1 and Z2 is oxa or NR5 and R7 is the diradical of aliphatic or aromatic diisocyanate, with the proviso that in case X is oxa, Y is different from a direct bond, and R2 and R3 are hydrogen.