Aqueous emulsion and uses thereof
View Patent ↗The invention is to provide: an aqueous emulsion which is excellent in emulsion polymerization stability when produced, and is excellent in mechanical stability, freezing stability, stability to long-term standing at high temperatures, water resistance adhesive property, and redispersibility; and a redispersible resin and adhesive where the aqueous emulsion is used. The invention relates to an aqueous emulsion comprising a polyvinyl alcohol-based resin (A) comprising a 1,2-diol component in a side chain and having an average degree of polymerization of 50 to 2,500 and a polymer (B) comprising at least one unsaturated monomer selected from an ethylenically unsaturated monomer and a diene-based monomer.
1. An aqueous emulsion comprising:
a polyvinyl alcohol-based resin (A) comprising a 1,2-diol component in a side chain and having an average degree of polymerization of 50 to 500; and
a polymer (B) that is obtained by emulsion-polymerizing a (meth)acrylic acid ester-based monomer in the presence of the polyvinyl alcohol-based resin (A) as an emulsifier.
2. The aqueous emulsion according to claim 1 , wherein the polyvinyl alcohol-based resin (A) comprises a 1,2-diol structure unit represented by the following formula (1):
wherein each of R 1 , R 2 , and R 3 independently represents a hydrogen atom, and R 4 represents a single bond or an alkylene group having 1 to 3 carbon atoms.
3. The aqueous emulsion according to claim 1 , wherein a content of the 1,2-diol structure unit in the polyvinyl alcohol-based resin (A) is 1 to 15% by mole.
4. A redispersible resin powder formed from the aqueous emulsion according to claim 1 .
5. An adhesive comprising the aqueous emulsion according to claim 1 .