Aqueous emulsion and adhesive using same

An aqueous emulsion, comprising:

• an ethylenically unsaturated monomer unit-containing polymer (A) as a dispersoid;
• and
• a vinyl alcohol polymer (B) as a dispersant,
• wherein the ethylenically unsaturated monomer unit-containing polymer (A) comprises a structural unit derived from a radical-polymerizable ethylenically unsaturated monomer (a) having a functional group of formula (W):
• wherein X is O or S, and * represents a bond,
• wherein the vinyl alcohol polymer (B) has a degree of saponification of 80 mol % or more,
• wherein the emulsion comprises no polyaldehyde capable of releasing aldehyde groups in an acid medium, and
• wherein the vinyl alcohol polymer (B) is an ethylene-modified vinyl alcohol polymer.

An aqueous emulsion, comprising:

• an ethylenically unsaturated monomer unit-containing polymer (A) as a dispersoid and
• a vinyl alcohol polymer (B) as a dispersant,
• wherein the ethylenically unsaturated monomer unit-containing polymer (A) comprises a structural unit derived from a radical-polymerizable ethylenically unsaturated monomer (a) having a functional group of formula (W);
• wherein X is O or S, and * represents a bond,
• wherein the vinyl alcohol polymer (B) has a degree of saponification of 80 mol % or more,
• wherein the emulsion comprises no polyaldehyde capable of releasing aldehyde groups in an acid medium, and
• wherein the ethylenically unsaturated monomer (a) comprises a third compound of formula (III):
• wherein
• X is O or S,
• R1 is a 2-(2-carboxyacrylamide)ethyl group, a vinyl group, an allyl group, an isopropenyl group, an acryloyl group, a methacryloyl group, a 2-hydroxy-3-(allyloxy)propyl group, or a functional group of formula (IV):
• R4-A1-Alk- (IV), wherein R4 is a 2-hydroxy-3-(allyloxy)propyl group, a vinyl group, a methacryloyl group, an acryloyl group, or a methacryloyloxyaceto group, A1 is —O— or —NR5—, R5 is H or a C1 to C8 alkyl group, and Alk is a C2 to C8 alkylene chain, and
• R2 is H or a C1 to C8 alkyl group,
• A2 is an alkylene chain having 2 or 3 carbon atoms, the alkylene chain optionally comprising a substituent and/or a carbonyl group between the carbon atoms.