Process for cross-linking an acrylic polymer or copolymer or an acrylic derivatives of a copolymer and the cross-linked acrylic polymer thereby obtained
AssigneePolymekon S.r.l.
InventorsGerardo Balestrieri, Carmelo Protopapa
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Abstract
The invention relates to a process for cross-linking an acrylic polymer and the acrylic polymer made using this process.
Claims12
A process for preparing a cross-linked acrylic polymer from water-soluble acrylamide monomers comprising the following steps:
- preparing an aqueous polymerizing solution comprising the acrylamide monomer and catalyzing agents;
- polymerizing the monomers present in the polymerizing solution by agitating and heating the polymerizing solution;
- the process being characterised in that the polymerization step is conducted in the presence of gaseous oxygen to obtain a cross-linked acrylic polymer.
The process according to one or more of the foregoing claims, wherein, after the polymerization step, the polymer is subjected to a further step of washing in aqueous medium at a temperature from 80 to 100° C. for a length of time varying from 3 to 5 hours.
The process according to claim 7, wherein the polymerization of the monomers is performed for a length of time varying from 1 to 24 hours.
The process according to one or more of the foregoing claims, wherein the aqueous polymerizing solution comprises the acrylamide monomer and one or more other monomers selected from N,N′-methylene-bits-acrylamide and N,N′-ethylene-bis-acrylamide.
The process according to one or more of the foregoing claims, wherein the polymerizing solution further comprises ethylene-bis(oxyethylene nitrilo)-tetracetic acid.
A cross-linked acrylic polymer obtainable using the process according to one or more of the foregoing claims from 1 to 10.
Dependencies are inferred from the claim text.