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A sizing agent for reinforcement fibers which imparts good bonding performance to a reinforcement fiber is used to reinforce thermoplastic matrix resin, and provide a synthetic fiber strand applied with the sizing agent and a fiber-reinforced composite reinforced with the synthetic fiber strand. The sizing agent essentially contains a neutralization product of a modified polypropylene resin and an amine compound having at least two hydroxyl groups or amino groups in the molecule, and the nonvolatile component of the sizing agent exhibits an endothermic heat of fusion not higher than 50 J/g in determination with a differential scanning calorimeter (DSC).

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.

Heat-expandable microspheres with high encapsulation efficiency of a blowing agent and good heat-expansion performance, a process for reproducibly producing the heat-expandable microspheres and application thereof are provided. The heat-expandable microspheres comprise essentially a thermoplastic resin shell and a blowing agent encapsulated therein, and contain not more than 500 ppm of silicon, not more than 350 ppm of aluminum and not more than 600 ppm of the total of the silicon and aluminum. The heat-expandable microspheres retain at least 70% of the blowing agent encapsulated therein at the temperature which is the average of their expansion-initiation temperature and maximum expansion temperature.

Matsumoto Yushi Seiyaku Co. | Date: 2012-01-23

The present invention provides heat-expanded microspheres having high packing efficiency, and a production method thereof. The heat-expanded microspheres are produced by expanding heat-expandable microspheres, which comprise shell of thermoplastic resin and a blowing agent encapsulated therein having a boiling point not higher than the softening point of the thermoplastic resin and have an average particle size from 1 to 100 micrometer, at a temperature not lower than their expansion initiating temperature, and the heat-expanded microspheres result in a void fraction not higher than 0.70.

Matsumoto Yushi Seiyaku Co. | Date: 2012-10-09

A method that produces heat-expandable microspheres includes the use of a shell of thermoplastic resin and a non-fluorine blowing agent encapsulated therein having a boiling point not higher than the softening point of the thermoplastic resin. The method includes a step of dispersing an oily mixture containing a polymerizable component, the blowing agent, and a polymerization initiator containing a peroxydicarbonate in an aqueous dispersing medium to polymerize the polymerizable component contained in the oily mixture. The resultant heat-expandable microspheres have a shell which is less apt to become thinner than its theoretical value, contain minimum amount of resin particle inside their shell, and have excellent heat-expanding performance.

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