(Meth)acrylic resin emulsion and process for producing the same
AssigneeKuraray Co., Ltd.
InventorsSeiji Tanimoto, Naoki Fujiwara
Life of this patent
Estimating the term…
Abstract
Provided is a (meth)acrylic resin emulsion comprising, as a dispersant, a vinyl alcohol polymer having a degree of saponification of from 80 to 95 mol % and a degree of polymerization of from 400 to 2000 and, as a dispersoid, a polymer comprising at least one type of monomer units selected from acrylate monomer units and methacrylate monomer units, which has a “factor a” of at least 0.3 that indicates the particle size distribution width of the emulsion and of which the film formed at 20° C. to have a thickness of 500 μm has a tensile strength of at least 100 kg/cm2. The emulsion is excellent in all its film strength, film transparency and mechanical stability and further in its alkali resistance.
Claims13
A (meth)acrylic resin emulsion comprising, as a dispersant, a vinyl alcohol polymer having a degree of saponification of from 80 to 95 mol % and a degree of polymerization of from 400 to 2000 and, as a dispersoid, a polymer comprising at least one type of monomer units selected from acrylate monomer units and methacrylate monomer units, which has a “factor a” of at least 0.3 that indicates the particle size distribution width of the emulsion and of which the film formed at 20° C. and 65% RH to have a thickness of 500 μm has a tensile strength of at least 100 kg/cm2.
A method for producing a (meth)acrylic resin emulsion which has a “factor a” of at least 0.3 that indicates the particle size distribution width of the emulsion and of which the film formed at 20° C. and 65% RH to have a thickness of 500 μm has a tensile strength of at least 100 kg/cm2;
- the method comprising emulsion (co)polymerization of at least one monomer selected from acrylate monomers and methacrylate monomers, using, as a dispersant, a vinyl alcohol polymer having a degree of saponification of from 80 to 95 mol % and a degree of polymerization of from 400 to 2000 and using a redox-type polymerization initiator that comprises a peroxide and a reducing agent, wherein the emulsion (co)polymerization is effected in such a controlled manner that (1) an iron compound, (2) the monomer and (3) the vinyl alcohol polymer are fed into the reactor in the initial stage of the reaction and the peroxide is continuously or intermittently added to the polymerization system.
Dependencies are inferred from the claim text.