A water-absorbent resin containing a vinyl alcohol-based polymer and having a crystal melting enthalpy of more than 0 J/g in a dry state.

A water-absorbent resin containing a vinyl alcohol-based polymer and having a crystal melting enthalpy of more than 0 J/g in a dry state.

This disclosure relates to silicon modified vinyl acetate ethylene copolymers and to emulsions and articles of manufacture based on the same.

This disclosure relates to silicon modified vinyl acetate ethylene copolymers and to emulsions and articles of manufacture based on the same.

Provided is a composition for optical stereolithography the stereolithography (photocuring) of which is completed in a shorter time and which provides a stereolithographic object having excellent strength (strength that prevents the occurrence of a fracture and the like when the stereolithographic object is subjected to an impact, or dropping, and strength with which the stereolithographic object can withstand repeated folding). The composition for optical stereolithography of the present invention includes (A) a diallyl phthalate-based polymer; (B) radical polymerizable compounds having a methacrylic group and/or an acrylic group; (C) a radical polymerization initiator; and (D) a sensitizer. The (B) radical polymerizable compounds includes at least (B1) an epoxy (meth)acrylate having a methacrylic group and/or an acrylic group, or (B2) a dioxane (meth)acrylate having a methacrylic group and/or an acrylic group. The composition contains 0.5 to 10% by mass of (A), 5 to 43% by mass of (B1) and (B2), 20 to 95% by mass of (B) other than (B1) and (B2), 0.1 to 5% by mass of (C), and 0.1 to 5% by mass of (D).

Provided is a composition for optical stereolithography the stereolithography (photocuring) of which is completed in a shorter time and which provides a stereolithographic object having excellent strength (strength that prevents the occurrence of a fracture and the like when the stereolithographic object is subjected to an impact, or dropping, and strength with which the stereolithographic object can withstand repeated folding). The composition for optical stereolithography of the present invention includes (A) a diallyl phthalate-based polymer; (B) radical polymerizable compounds having a methacrylic group and/or an acrylic group; (C) a radical polymerization initiator; and (D) a sensitizer. The (B) radical polymerizable compounds includes at least (B1) an epoxy (meth)acrylate having a methacrylic group and/or an acrylic group, or (B2) a dioxane (meth)acrylate having a methacrylic group and/or an acrylic group. The composition contains 0.5 to 10% by mass of (A), 5 to 43% by mass of (B1) and (B2), 20 to 95% by mass of (B) other than (B1) and (B2), 0.1 to 5% by mass of (C), and 0.1 to 5% by mass of (D).

The present invention relates to a composition comprising an aqueous dispersion of copolymer particles comprising structural units of vinyl acetate, a cyclic ketene acetal monomer, and a monoethylenically unsaturated acid monomer, or a salt thereof; wherein the cyclic ketene acetal monomer is characterized by following structure:

##STR00001## where n and the R groups are as defined herein. The composition of the present invention provides a water-borne dispersion that is substantially free of volatile organic solvents and that provides a readily degradable polymer that is useful, for example, in the manufacture of biodegradable packaging products.

The present invention relates to a composition comprising an aqueous dispersion of copolymer particles comprising structural units of vinyl acetate, a cyclic ketene acetal monomer, and a monoethylenically unsaturated acid monomer, or a salt thereof; wherein the cyclic ketene acetal monomer is characterized by following structure:

##STR00001## where n and the R groups are as defined herein. The composition of the present invention provides a water-borne dispersion that is substantially free of volatile organic solvents and that provides a readily degradable polymer that is useful, for example, in the manufacture of biodegradable packaging products.

The present invention relates to a method comprising the steps of a) contacting under emulsion polymerization conditions vinyl acetate; a cyclic ketene acetal monomer; and a monoethylenically unsaturated acid monomer or a salt thereof; to form an aqueous dispersion of copolymer particles comprising structural units of vinyl acetate, the cyclic ketene acetal, and the monoethylenically unsaturated acid monomer or a salt thereof; wherein the cyclic ketene acetal monomer is characterized by following structure:

##STR00001##

where n and the R groups are as defined herein. The method of the present invention provides a water-borne dispersion that is substantially free of volatile organic solvents and that provides a readily degradable polymer that is useful, for example, in the manufacture of biodegradable packaging products.

The present invention relates to a method comprising the steps of a) contacting under emulsion polymerization conditions vinyl acetate; a cyclic ketene acetal monomer; and a monoethylenically unsaturated acid monomer or a salt thereof; to form an aqueous dispersion of copolymer particles comprising structural units of vinyl acetate, the cyclic ketene acetal, and the monoethylenically unsaturated acid monomer or a salt thereof; wherein the cyclic ketene acetal monomer is characterized by following structure:

##STR00001##

where n and the R groups are as defined herein. The method of the present invention provides a water-borne dispersion that is substantially free of volatile organic solvents and that provides a readily degradable polymer that is useful, for example, in the manufacture of biodegradable packaging products.