Crosslinking agent based on polyallyl ether compound
AssigneeDaiso Co., Ltd.
InventorsShin-ichiro Nakamura, Yasumi Shimizu, Tohru Matsutomi
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Abstract
A crosslinking agent containing a polyallyl ether compound having at least one hydroxyl group derived from a glycidyl group and at least two allyl groups can be used for the production of a highly water-absorbing polymer comprising a polymerizable compound having a carbon-carbon double bond or a salt thereof, has a high solubility in aqueous solution of the monomer and gives a highly water-absorbing polymer having water absorptivity required at practical levels.
Claims10
A crosslinking agent for use in the production of a highly water-absorbing polymer comprising a polymerizable compound having a carbon-carbon double bond or a salt thereof,
- said crosslinking agent comprising a polyallyl ether compound having at least two allyl groups and at least one hydroxyl group derived from a glycidyl group, and
- said polyallyl ether compound being:
- (A-1) a polyallyl ether compound having at least two allyl groups and at least one hydroxyl group derived from a glycidyl group, and having no oxyethylene chain, and/or
- (A-2) a polyallyl ether compound having at least two allyl groups and at least one hydroxyl group derived from a glycidyl group, and having at least one oxyethylene chain, which is an addition product between an ethyleneglycol diglycidyl ether compound of the general formula:
- GO-(CH2CH2O)n-G
- wherein
- G is a glycidyl group, and
- n is a whole number of at least 1,
- and trimethylolpropane diallyl ether.
The crosslinking agent according to anyone of claims 12 or 3 wherein the polyallyl ether compound (A-1) having no oxyethylene chain is a compound of the general formula (I):
- R1—OC(R3)2—C(R3)(OH)—C(R3)2 O—R2 (I)
- wherein
- R1 and R2 are, the same or different, an allyl group, or a hydrocarbon group (the number of carbon atoms in the hydrocarbon group is from 1 to 15) having an allyl group and optionally having an ether oxygen atom and/or a hydroxyl group, and
- each R3 is, the same or different, a hydrogen atom, a linear or branched alkyl group having 1 to 10 carbon atoms or a halogen atom.
Dependencies are inferred from the claim text.