Nippon Soda Co., Ltd.

Akihiro Shirai

Shinichi Kimizuka

Takeshi Niitani

Eiji Takahashi

Mitsuhiro Nakamura

Kiyoshi Kawamura

Hiroshi Takahashi

Yasunori Miyashita

Takeshi Shimotori

Toshiaki Okado

A polybutadiene having a hydroxyl group at a terminal end thereof is reacted with a lactone compound such as an &#x3b5;-caprolactone to obtain a polymer polyol represented by formula (I): HO&#x2014;X&#x2014;Y&#x2014;X&#x2014;OH (wherein Xand Xeach independently represents a polyester component and Y represents a polybutadiene component), the polymer polyol is reacted with an unsymmetric diisocyanate to obtain a urethane prepolymer, and then the urethane prepolymer is reacted with a chain extender to obtain a polyurethane.

Polyurethane

The present invention provides a styrene-based star polymer with narrow dispersion and suitable as a resist material, etc. A star polymer of the present invention is represented by the formula A[C(Y)X](wherein A represents a polyvalent aliphatic hydrocarbon group with 4-15 carbons, C represents a carbon atom, X represents a styrene-based polymer chain, Y represents a hydroxy group or an oxo group, m represents an integer of 1 or 2, and n represents any integer from 2 to 5, with the proviso that if Y is a hydroxy group, m is 2, and if Y is an oxo group, m is 1). The star polymer can be produced by reacting a styrene-based polymer having an anionic end, and an aliphatic carboxylic acid ester represented by A(COOR)(wherein R represents an alkyl group having 1-8 carbons, and A and n are as defined for the above formula).

Star polymer and method of producing same

A multibranched polymer represented by the following formula (I), and a method for producing the multibranched polymer: where A represents an organic group having 3 or more branched chains, Xrepresents a linking group containing any atom of Groups 14 to 16 in the Periodic Table, Y represents a functional group having a structure capable of having an active halogen atom, Q represents an arm moiety having a repeating unit derived from a polymerizable unsaturated bond, mrepresents any integer of 1 to the number of branched chains of A, mrepresents the number of branched chains of A, nrepresents an integer of 0 or 1 or more, and Rrepresents an organic group that is not associated with the polymerization reaction.

Multibranched polymer and method for producing the same

A modified polysiloxane compound represented by formula (I): X(Y)n (I), where X represents a polymer block having a repeating unit represented by formula (II), Y represents a polymer block having a repeating unit represented by formula (III), and n represents 1 or 2, and having an X to Y weight ratio of 1/99&#x2266;X/Y&#x2266;90/10 and a number-average molecular weight of 1,000 to 100,000 is subjected to treat for elimination of a protecting group for a hydroxyl group by adding a non-aqueous solution containing hydrogen chloride in the presence of a non-aqueous solvent so that hydrogen chloride is 0.9 to 1.3 equivalents with respect to 1 equivalent of the repeating unit represented by formula (II). 

Process for the production of modified polysiloxanes

The present invention provides a multibranched polymer represented by the following formula (I), and a method for producing the multibranched polymer: wherein A represents an organic group having 3 or more branched chains, Xrepresents a linking group containing any atom of Groups 14 to 16 in the Periodic Table, Y represents a functional group having a structure capable of having an active halogen atom, Q represents an arm moiety having a repeating unit derived from a polymerizable unsaturated bond, mrepresents any integer of 1 to the number of branched chains of A, mrepresents the number of branched chains of A, nrepresents an integer of 0 or 1 or more, and Rrepresents an organic group which is not associated with the polymerization reaction.

An iodonium salt compound which is colored little, can be easily synthesized in high yield, is highly sensitive to irradiation with actinic energy rays such as light, electronic beams, or X-rays, is highly soluble in monomers, and is lowly toxic; and a photocurable composition which can cure in a short time even when the counter anion is a hexafluorophosphonate, tetrafluoroborate, etc., regardless of whether it is clear or pigmented, and which gives a cured object having excellent properties. The photocurable composition is prepared by compounding an iodonium salt compound represented by the general formula (I) with a cationically polymerizable compound, a sensitizer, etc.

Photocurable composition containing iodonium salt compound

A photopolymerization initiator comprising an iodonium salt compound; and a photocurable composition containing the compound. The composition is a photocurable cationic composition which cures in a short time upon irradiation with actinic energy rays. They are based on the following findings: (1) a colorless lowly toxic iodonium salt compound can be easily synthesized in high yield when a specific substrate is used as a starting material; (2) a photocurable composition curing in a short time to give a cured article having excellent material properties is obtained by using the iodonium salt compound in combination with a sensitizer; and (3) a highly sensitive photocurable composition which upon irradiation with actinic energy rays cures in a short time to give a cured article having excellent material properties is obtained by using a compound having a group functioning as a cationic photopolymerization initiator, a sensitizing group accelerating the phtoinitiated cationic reaction, and a cationically polymerizable group in the same molecule.

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Ichihara, Japan

Akihiro Shirai