HEAT-EXPANDABLE MICROSPHERES AND HOLLOW FINE PARTICLES AND METHOD FOR PRODUCING THE SAME AS WELL AS TIRE/RIM ASSEMBLY
First Claim
1. Heat-expandable microspheres each consisting of an outer shell made of a thermoplastic resin obtained by polymerizing a monomer component in the presence of a polymerization initiator, and a foaming agent encapsulated in the outer shell and having a boiling point not higher than a softening point of the thermoplastic resin, whereinthe polymerization initiator comprises a peroxydicarbonate as an essential component, andthe foaming agent comprises a fluorine-containing compound having an ether structure and a carbon number of 2-10 and containing no chlorine atom and bromine atom.
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Abstract
In heat-expandable microspheres as a starting material for hollow fine particles, which have excellent performances required for giving not only a durability in steady running region but also a durability in high-speed running region to a tire-rim assembly, and each consisting of an outer shell made of a thermoplastic resin obtained by polymerizing a monomer component in the presence of a polymerization initiator, and a foaming agent encapsulated in the outer shell and having a boiling point not higher than a softening point of the thermoplastic resin, the polymerization initiator comprises a peroxydicarbonate as an essential component, and the foaming agent comprises a fluorine-containing compound having an ether structure and a carbon number of 2-10 and containing no chlorine atom and bromine atom.
19 Citations
45 Claims
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1. Heat-expandable microspheres each consisting of an outer shell made of a thermoplastic resin obtained by polymerizing a monomer component in the presence of a polymerization initiator, and a foaming agent encapsulated in the outer shell and having a boiling point not higher than a softening point of the thermoplastic resin, wherein
the polymerization initiator comprises a peroxydicarbonate as an essential component, and the foaming agent comprises a fluorine-containing compound having an ether structure and a carbon number of 2-10 and containing no chlorine atom and bromine atom.
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7. Heat-expandable microspheres each consisting of an outer shell made of a thermoplastic resin obtained by polymerizing a monomer component in the presence of a polymerization initiator, and a foaming agent encapsulated in the outer shell and having a boiling point not higher than a softening point of the thermoplastic resin, wherein
the foaming agent comprises a fluorine-containing compound having an ether structure and a carbon number of 2-10 and containing no chlorine atom and bromine atom, and a compression recovering ratio is not less than 75% after hollow fine particles obtained by heat-expanding the heat-expandable microspheres are subjected to a treatment of increasing an internal pressure.
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13. A method for producing heat-expandable microspheres by steps of dispersing an oily mixture of a monomer component, a foaming agent and a polymerization initiator into an aqueous dispersion medium and polymerizing the monomer component included in the oily mixture, wherein
as the foaming agent is used a foaming agent comprising a fluorine-containing compound having an ether structure and a carbon number of 2-10 and containing no chlorine atom and bromine atom, and as the polymerization initiator is used a polymerization initiator comprising a peroxydicarbonate as an essential component.
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25. Hollow fine particles each consisting of an outer shell made of a thermoplastic resin, and a foaming agent encapsulated in the outer shell and having a boiling point not higher than a softening point of the thermoplastic resin, wherein
the foaming agent comprises a fluorine-containing compound having an ether structure and a carbon number of 2-10 and containing no chlorine atom and bromine atom, and a compression recovering ratio is not less than 75% after the hollow fine particles are subjected to a treatment of increasing internal pressure.
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30. Hollow fine particles each consisting of an outer shell made of a thermoplastic resin obtained by polymerizing a monomer component in the presence of a polymerization initiator, and a foaming agent encapsulated in the outer shell and having a boiling point not higher than a softening point of the thermoplastic resin, wherein
the polymerization initiator comprises a peroxydicarbonate as an essential component, the foaming agent comprises a fluorine-containing compound having an ether structure and a carbon number of 2-10 and containing no chlorine atom and bromine atom, and a pressure in a hollow portion is not lower than the atmospheric pressure.
Specification