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Thermo-expansive microcapsules comprising a shell of a polymer produced by polymerizing a mixture of monomers, which comprises (I) a nitrile monomer, (II) a monomer having an unsaturated double bond and carboxyl groups in a molecule, (III) a monomer having two or more of polymerizable double bonds i

Thermo-expansive microcapsules comprising a shell of a polymer produced by polymerizing a mixture of monomers, which comprises (I) a nitrile monomer, (II) a monomer having an unsaturated double bond and carboxyl groups in a molecule, (III) a monomer having two or more of polymerizable double bonds in a molecule, and optionally, (IV) a monomer different from and copolymerizable with the monomers (I), (II) and (III) and a blowing agent encapsulated in the shell. The volume retention of the expanded microcapsules of the thermo-expansive microcapsules is 50% or more after loaded with 15 MPa.

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What is claimed is: 1. Thermo-expansive microcapsules comprising a shell of a polymer produced by polymerizing a mixture of monomers, which comprises 40 to 95 weight percent of (I) a nitrile monomer, 7 to 50 weight percent of (II) a monomer having an unsaturated double bond and a carboxyl group in

What is claimed is: 1. Thermo-expansive microcapsules comprising a shell of a polymer produced by polymerizing a mixture of monomers, which comprises 40 to 95 weight percent of (I) a nitrile monomer, 7 to 50 weight percent of (II) a monomer having an unsaturated double bond and a carboxyl group in a molecule, 0.01 to 5 weight percent of (III) a monomer having two or more of polymerizable double bonds in a molecule, and optionally, 0 to 15 weight percent of (IV) a monomer different from and copolymerizable with the monomers (I), (II) and (III) and a blowing agent encapsulated in the shell, wherein the mixture of monomers does not substantially contain a monomer having a functional group reactive with the carboxyl group contained in the (II) monomer. 2. The thermo-expansive microcapsules of claim 1, of which expanded microcapsules have a volume retention of 50% or more after loaded with 15 MPa at 25째 C. and/or 140째 C. 3. The thermo-expansive microcapsules of claim 1 or 2, wherein a polymerization initiator for polymerizing the mixture of monomers is an oil-soluble peroxide, an azo compound or a substance having a half life of 1 to 25 hours at a polymerization temperature. 4. The thermo-expansive microcapsules of claim 1 or 2, of which maximum expanding temperature is 160째 C. or higher. 5. Resin compositions comprising the thermo-expansive microcapsules of claim 1 or expanded microcapsules thereof, and a resin. 6. The thermo-expansive microcapsules of claim 1, wherein the content of the monomer having a functional group reactive with the carboxyl group contained in the (II) monomer is less than 1 weight percent of the mixture of monomers. 7. The thermo-expansive microcapsules of claim 6, wherein the (IV) monomer includes at least one member selected from the group consisting of vinylidene chloride, vinyl acetate, (meth)acrylates, styrene monomers, acrylamide, and methacrylamide. 8. The thermo-expansive microcapsules of claim 6, wherein the (meth)acrylates are methyl(meth)acrylate, ethyl(meth)acrylate, n-butyl(meth)acrylate, isobutyl(meth)acrylate, t-butyl(meth)acrylate, isobomyl(meth)acrylate, cyclohexyl(meth)acrylate, benzyl(meth)acrylate, and β-carboxyethyl acrylate. 9. The thermo-expansive microcapsules of claim 6, of which expanded microcapsules have a volume retention of 50% or more after loaded with 15 MPa at 25째 C. and/or 140째 C. 10. The thermo-expansive microcapsules of claim 6, of which maximum expanding temperature is 160째 C. or higher. 11. Resin compositions comprising the thermo-expansive microcapsules of claim 6 or expanded microcapsules thereof, and a resin. 12. Thermo-expansive microcapsules comprising a shell of a polymer produced by polymerizing a mixture of monomers, which comprises 40 to 95 weight percent of (I) a nitrile monomer, 7 to 50 weight percent of (II) a monomer having an unsaturated double bond and a carboxyl group in a molecule, 0.01 to 5 weight percent of (III) a monomer having two or more of polymerizable double bonds in a molecule, and optionally, 0 to 20 weight percent of (IV) a monomer different from and copolymerizable with the monomers (I), (II) and (III) and a blowing agent encapsulated in the shell, wherein the (IV) monomer includes at least one member selected from the group consisting of vinylidene chloride, vinyl acetate, methyl(meth)acrylate, ethyl(meth)acrylate, n-butyl(meth)acrylate, isobutyl(meth)acrylate, t-butyl(meth)acrylate, isobomyl(meth)acrylate, cyclohexyl(meth)acrylate, benzyl(meth)acrylate, β-carboxyethyl acrylate, styrene monomers, acrylamide, and methacrylamide, and of which expanded microcapsules have a volume retention of 50% or more after loaded with 15 MPa at 25째 C. and/or 140째 C. 13. The thermo-expansive microcapsules of claim 12, of which maximum expanding temperature is 160째 C. or higher. 14. Resin compositions comprising the thermo-expansive microcapsules of claim 12 or expanded microcapsules thereof, and a resin. 15. Thermo-expansive microcapsules comprising a shell of a polymer produced by polymerizing a mixture of monomers, which comprises 40 to 95 weight percent of (I) a nitrile monomer, 7 to 50 weight percent of (II) a monomer having an unsaturated double bond and a carboxyl group in a molecule, 0.01 to 5 weight percent of (III) a monomer having two or more of polymerizable double bonds in a molecule, and optionally, 0 to 15 weight percent of (IV) a monomer different from and copolymerizable with the monomers (I), (II) and (III) and a blowing agent encapsulated in the shell, and of which expanded microcapsules have a volume retention of 50% or more after loaded with 15 MPa at 25째 C. and/or 140째 C. 16. Resin compositions comprising the thermo-expansive microcapsules of claim 15 or expanded microcapsules thereof, and a resin.