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US 6,310,175 B1Granted
Star-shaped block copolymer and production process therefor
AssigneeNippon Shokubai Co., Ltd.
InventorsNobuhiro Kobayashi, Masatoshi Yoshida
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AssigneeNippon Shokubai Co., Ltd.
InventorsNobuhiro Kobayashi, Masatoshi Yoshida
Estimating the term…
The present invention provides a new star-shaped block copolymer and a production process therefor, wherein the new star-shaped block copolymer has high heat resistance despite having a low viscosity. It has been found that a new star-shaped block copolymer has high heat resistance wherein the new star-shaped block copolymer comprises a plurality of star-shaped structures 1 in which at least three chain polymer segments 2 are radially extended from a central polyvalent mercaptan segment 3, wherein the star-shaped structures 1 are bonded to each other through a bonding structure 4 at their chain polymer segments. In addition, in a production process for a star-shaped block copolymer comprising the multistep radical polymerization in the presence of a polyvalent mercaptan wherein the elementary steps of the multistep radical polymerization differ in polymerizable monomers as used therein, the improvement according to the present invention is characterized in that at least one of the elementary steps of the multistep radical polymerization involves the joint use of a polyfunctional monomer with the polymerizable monomer.
A new star-shaped block copolymer, comprising a plurality of star-shaped structures in which at least three chain polymer segments are radially extended from a central polyvalent mercaptan segment, wherein one of said at least three chain polymer segments comprises a bonding portion derived from a polyfunctional monomer having at least two polymerizable unsaturated groups per molecule, wherein said bonding portion of one chain polymer segment of a first star-shaped structure is bonded to said bonding portion of one chain polymer segment of a second star-shaped structure.
A process for producing a new star-shaped block copolymer, comprising the multistep radical polymerization in the presence of a polyvalent mercaptan wherein the elementary steps of the multistep radical polymerization differ in polymerizable monomers as used therein, with the production process being characterized in that at least one of the elementary steps of the multistep radical polymerization involves the joint use of a polyfinctional monomer with the polymerizable monomer, with the polyflinctional monomer having at least two polymerizable unsaturated groups per molecule.
A new star-shaped block copolymer, comprising:
Dependencies are inferred from the claim text.