water-swellable polymer beads
A water-swellable, polymer-based technology, applied in the field of polymer pellet preparation, can solve problems such as reduced compatibility
Inactive Publication Date: 2016-08-24
SAUDI BASIC IND CORP SA
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Problems solved by technology
The problem with using emulsifiers with longer linear alkyl chains is that the compatibility of the tails of these aliphatic emulsifiers with the aromatic styrene / polystyrene phase decreases as the conversion of the styrene / polystyrene mixture increases
Method used
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Embodiment 1-8
[0121]Examples 1-8 were carried out in the same manner as Example 9, except that the parameters were varied as described in Table 1.
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The present invention relates to a process for the emulsifier-free preparation of water-swellable polymer beads, said process comprising the steps of: a) providing an emulsifier-free starting composition comprising styrene and a polyphenylene ether resin, b) pre- polymerizing the starting composition to obtain a prepolymer composition, c) adding to the prepolymer composition an aqueous dispersion of nanoclay without modifiers to obtain an inverse emulsion, d) a suspending step in an aqueous medium c) the inverse emulsion obtained in step d) to produce an aqueous suspension of suspended droplets, and e) polymerizing the monomers in the droplets of the suspension obtained in step d) to obtain water-swellable polymer globules .
Description
technical field [0001] The present invention relates to a process for the preparation of water-swellable polymer beads (WEPS). Background technique [0002] Commercial expandable polystyrene pellets (EPS) usually use pentane as a blowing agent. Use pentane and its isomers to form low-density homogeneous EPS foam. But one major disadvantage of using pentane or its isomers is that it is harmful to the environment. Research has shown that both pentane and its isomers contribute to the formation of ozone in the lower atmosphere. In addition, carbon dioxide, which contributes to the greenhouse effect, is also formed during the photooxidation of pentane. [0003] The dissertation "WaterExpandablePolystyrene" by J.J.Crevecoeur of the University of Eindhoven in 1997 describes a process for the production of WEPS in which water finely dispersed in styrene is first emulsified by surface-active substances and the styrene is subsequently polymerized to a conversion of 50%. The mixtu...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C08J9/12C08J9/20C08L25/06C08K3/34C08L71/12
CPCC08J9/0061C08J9/008C08J9/20C08J2325/06C08J2471/12C08K3/346C08L25/06C08L71/12C08L25/14
Inventor G·加姆迪M·A·G·扬森L·N·I·H·内利森姆
Owner SAUDI BASIC IND CORP SA
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