Process for preparation of spontaneously-crosslinked alkali metal acrylate polymers
AssigneeKao Soap Co., Ltd.
InventorsShuzo Aoki, Harumasa Yamasaki
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Abstract
Spontaneously cross-linked alkali metal acrylate polymers having a high water-absorbing property and which are safe for contact with the human skin are prepared by a water-in-oil suspension polymerization process, using a sorbitan fatty acid ester having an HLB value of 3 to 6 as a dispersing agent.
Claims7
A process for the preparation of powdery, spontaneously crosslinked, alkali metal acrylate homopolymer having a water absorption capacity of at least 400 grams per one gram of dried polymer, said process comprising dispersing and suspending an aqueous solution of an alkali metal acrylate having a concentration of at least 40% by weight and containing a water-soluble radical polymerization initiator in a liquid aliphatic hydrocarbon solvent, in the presence of a sorbitan fatty acid ester having an HLB value of 3 to 6, and polymerizing the alkali metal acrylate in the absence of a crosslinking agent.
Dependencies are inferred from the claim text.