HEAT-EXPANDABLE MICROSPHERES AND HOLLOW FINE PARTICLES AND METHOD FOR PRODUCING THE SAME AS WELL AS TIRE/RIM ASSEMBLY
First Claim
1. A tire/rim assembly, characterized in that a tire is assembled onto a rim and a great number of hollow fine particles are arranged in a tire compartment defined by the tire and the rim, and further a high pressure gas exceeding the atmospheric pressure is filled in the tire compartment,wherein the hollow fine particles each consist 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,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, anda pressure in a hollow portion is not lower than the atmospheric pressure.
1 Assignment
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Accused Products
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.
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Citations
11 Claims
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1. A tire/rim assembly, characterized in that a tire is assembled onto a rim and a great number of hollow fine particles are arranged in a tire compartment defined by the tire and the rim, and further a high pressure gas exceeding the atmospheric pressure is filled in the tire compartment,
wherein the hollow fine particles each consist 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, 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