Method for producing acrylic polymer, acrylic polymer, and plastisol composition
View Patent ↗Disclosed is a method for producing a plastisol acrylic polymer which can have a satisfactory adhesion property even when the heating time is short and the heating temperature is low, and which has excellent storage stability. The method comprises (1) a step of polymerizing an acrylic monomer mixture (a) to produce a polymer (A) and (2) a step of polymerizing an acrylic monomer mixture (b) in a dispersion containing the polymer (A), wherein a monomer having a hydroxy group is contained in the acrylic monomer mixture (a), a monomer having an acetoacetyl group or a block isocyanate group is contained in the acrylic monomer mixture (b), and the dissolution parameter (SA) for the polymer (A) and the dissolution parameter (SB) for a polymer (B) produced by the polymerization of the acrylic monomer mixture (b) are different from each other.
1. A method for producing an acrylic polymer, the method comprising:
polymerizing an acrylic monomer mixture (a) to obtain a polymer (A);
and polymerizing, an acrylic monomer mixture (b) in a dispersion comprising, the polymer (A),
wherein
the acrylic monomer mixture (a) comprises a monomer having a hydroxyl group,
the acrylic monomer mixture (b) comprises a monomer having an acetoacetyl group or a blocked isocyanate group, and
a solubility parameter (SA) of the polymer (A) is different from a solubility parameter (SB) of a polymer (B) obtained by polymerizing the acrylic monomer mixture (b)
wherein the acrylic monomer mixture (b) comprises the monomer having an acetoacetyl group or a blocked isocyanate group in an amount of 0.7 to 15 mol % based on 100 mol % of the acrylic monomer mixture (b),
wherein the acrylic monomer mixture (a) comprises the monomer having a hydroxyl group in an amount of 0.1 to 15 mol % based on 100 mol % of the acrylic monomer mixture (a), and
wherein the acrylic monomer mixture (a) further comprises methyl methacrylate, butyl methacrylate, or a combination thereof in a total amount of 55 mol % or greater based on 100 mole of the acrylic monomer mixture (a).
2. The method of claim 1 , wherein the monomer having a hydroxyl group is a (meth)acrylic acid ester having a hydroxyl group.
3. The method of claim 1 , wherein the monomer having a hydroxyl group is at least one monomer selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and dipentaerythritol hexa(meth)acrylate.
4. The method of claim 1 , wherein the monomer having a hydroxyl group is at least one monomer selected from the group consisting of 2-hydroxyethyl (meth)acrylate and 2-hydroxypropyl (meth)acrylate.
5. The method of claim 1 , wherein the acrylic monomer mixture (a) comprises the monomer having a hydroxyl group in an amount of 0.1 to 10 mol % based on 100 mol % of the acrylic monomer mixture (a).
6. The method of claim 1 , wherein the acrylic monomer mixture (a) further comprises methyl methacrylate and butyl methacrylate in a molar ratio within a range of 20:80 to 75:25.
7. The method of claim 1 , wherein the acrylic monomer mixture (b) comprises a monomer having an acetoacetyl group.
8. The method of claim 1 , wherein the acrylic monomer mixture (b) comprises a monomer having a blocked isocyanate group.
9. The method of claim 7 , wherein the monomer having an acetoacetyl group is at least one monomer selected from the group consisting of 2-acetoacetoxyethyl (meth)acrylate, 2-acetoacetoxypropyl (meth)acrylate, 2-cyanoacetoacetoxyethyl methacrylate, N-(2-acetoxyaminoethyl) (meth)acrylamide, allyl acetoacetate, and vinyl acetoacetate.
10. The method of claim 8 , wherein the monomer having a blocked isocyanate group is at least one monomer selected from the group consisting of 2-[(3,5-dimethylpyrazolyl)carbonylamino]ethyl methacrylate and 2[O-(1′-methyl propylidene amino)carboxyamino]ethyl methacrylate.
11. The method of claim 1 , wherein the acrylic monomer mixture (b) comprises the monomer having an acetoacetyl group or a blocked isocyanate group in an amount of 0.7 to 9 mol % based on 100 mol % of the acrylic monomer mixture (b).