Crosslinking agent, crosslinked polymer, and compound
View Patent ↗An object of the invention is to provide a crosslinking agent with which a crosslinked polymer that suffers little coloring with the lapse of time and shows excellent viscosity stability is obtained. The crosslinking agent of the invention includes a compound which contains two or more alkylhydrazide groups represented by the following general formula (1). (In formula (1), R 1 represents an alkyl group having 1-10 carbon atoms, and symbol * is a linking bond.)
1. A crosslinkable composition comprising:
a compound which contains two or more alkylhydrazide groups represented by the following formula (1):
in which R 1 represents an alkyl group having 1-10 carbon atoms, and the symbol * is a linking bond; and
a polymer having carbonyl groups.
2. The crosslinkable composition according to claim 1 , wherein the compound has a solubility in 100 g of water of 50-500 g at 23° C.
3. The crosslinkable composition according to claim 1 , wherein the compound has a molecular weight of 150-3,000.
4. The crosslinkable composition according to claim 1 , wherein the compound is a dicarboxylic acid bis(1-alkylhydrazide) compound represented by the following formula (1a):
in which R 1 and R 2 each independently represent an alkyl group having 1-10 carbon atoms, and X represents a single bond or an alkylene chain having 1-10 carbon atoms.
5. The crosslinkable composition according to claim 1 , wherein the polymer is a polyvinyl alcohol-based resin.
6. A crosslinked polymer produced by crosslinking the crosslinkable composition according to claim 5 .
7. A method for preparing a crosslinkable composition comprising combining
a compound which contains two or more alkylhydrazide groups represented by the following formula (1):
in which R 1 represents an alkyl group having 1-10 carbon atoms, and the symbol * is a linking bond with
a polymer comprising carbonyl groups.