EP0036463A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for preparing an alkali acrylate polymer having high salt solution-absorbency and polymer produced thereby
Assignee: Sumitomo Seika Chemicals Co Ltd
•
Filing: 1980-11-14
•
Granted: —
•
Expires: 2000-11-14
Abstract
Abstract An alkali metal acrylate polymer obtained by suspending an aqueous solution of acrylic acid and an alkali metal acrylate in an alicyclic or aliphatic hydrocarbon solvent containing a surfactant having an HLB value of 8-12 and subjecting the suspension to inverse suspension polymerization in the presence of a water-soluble radical polymerization initiator has a much higher water-absorbency and particularly salt solution-absorbency than known ones. If said polymer is crosslinked with a crosslinking agent, its stability in the fluid-absorbed state for a long period of time is improved and the absorption rate when absorbing water is also improved.
Inventors
- 👤 Shigeji Obayashi
- 👤 Morio Nakamura
- 👤 Koichi Fujiki
- 👤 Takushi Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 08:49
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/04; C08F220/06; C08F2/00; C08F2/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A process for producing an alkali acrylate polymer having high salt solution-absorbency, characterised by suspending an aqueous solution of acrylic acid and an alkali acrylate, the mole ratio of the acrylic acid to the alkali acrylate being 50/50 to 50/98, in an alicyclic or aliphatic hydrocarbon solvent containing a surfactant having an HLB value of 8-12 and subjecting the suspension to inverse suspension polymerisation in the presence of a water-soluble radical polymerisation initiator.
Claim 2
Dependent Claim
73 words
A process for producing an alkali acrylate polymer having high salt solution-absorbency, characterised by suspending an aqueous solution of acrylic acid and an alkali acrylate, the mole ratio of the acrylic acid to the alkali acrylate being 50/50 to 50/98, in an alicyclic or aliphatic hydrocarbon solvent containing a surfactant having an HLB value of 8-12 and subjecting the suspension to inverse suspension polymerisation in the presence of a water-soluble radical polymerisation initiator.
Claim 3
Dependent Claim
18 words
A process according to claim 1, wherein the surfactant having an HLB value of 8-12 is sorbitan monolaurate.
Claim 4
Dependent Claim
13 words
A process according to claim 1 or 2, wherein the solvent is cyclohexane.
Claim 5
Dependent Claim
85 words
A process for producing an alkali acrylate polymer having high salt solution-absorbency, characterised by suspending an aqueous solution of acrylic acid and an alkali acrylate, the mole ratio of the acrylic acid to the alkali acrylate being 50/50 to 50/98, in an alicyclic or aliphatic hydrocarbon solvent containing a surfactant having an HLB value of 8-12, subjecting the suspension to inverse suspension polymerisation in the presence of a water-soluble radical polymerisation initiator, thereafter adding a crosslinking agent and subjecting the resulting mixture to crosslinking reaction.
Claim 6
Dependent Claim
85 words
A process for producing an alkali acrylate polymer having high salt solution-absorbency, characterised by suspending an aqueous solution of acrylic acid and an alkali acrylate, the mole ratio of the acrylic acid to the alkali acrylate being 50/50 to 50/98, in an alicyclic or aliphatic hydrocarbon solvent containing a surfactant having an HLB value of 8-12, subjecting the suspension to inverse suspension polymerisation in the presence of a water-soluble radical polymerisation initiator, thereafter adding a crosslinking agent and subjecting the resulting mixture to crosslinking reaction.
Claim 7
Dependent Claim
18 words
A process according to claim 4, wherein the surfactant having an HLB value of 8-12 is sorbitan monolaurate.
Claim 8
Dependent Claim
13 words
A process according to claim 4 or 5, wherein the solvent is cyclohexane.
Claim 9
Dependent Claim
36 words
A process according to claim 4, 5 or 6, wherein said crosslinking agent is ethylene glycol diglycidyl ether and it is used in an amount of 0.005-5.0% by weight based on the weight of the monomers.
Claim 10
Dependent Claim
11 words
An alkali acrylate polymer produced by the process of claim 1.
Claim 11
Dependent Claim
11 words
An alkali acrylate polymer obtained by the process of claim 4.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.