content_image/915919.jpg content_image/915920.jpg content_image/915921.jpg content_image/915922.jpg content_image/915923.jpg content_image/915924.jpg content_image/915925.jpg content_image/915926.jpg content_image/915928.jpg content_image/915929.jpg content_image/915930.jpg content_image/915927.jpg
<img src='content_image/915919.jpg'>

<img src='content_image/915920.jpg'>

<img src='content_image/915921.jpg'>

<img src='content_image/915922.jpg'>

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-continued 

LCl-7 

LCl-8 10 

LCl-9 

LCl-10 25 

LCl-11 

LCl-12 

LCl-13 

LCl-14 

<img src='content_image/915928.jpg'>

<img src='content_image/915929.jpg'>

<img src='content_image/915930.jpg'>

The lactone structural moiety may or may not have a substituent (Rb$_{2}$ ). Preferred examples of the substituent (Rb$_{2}$ ) include an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 4 to 7 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkoxycarbonyl group having 2 to 8 carbon atoms, a carboxyl group, a halogen atom, a hydroxyl group, a cyano group, and an acid› decomposable group. Among these, an alkyl group having 1 to 4 carbon atoms, a cyano group, and an acid-decomposable group are more preferable. n$_{2 }$ represents an integer of0 to 4. In a case where n$_{2 }$ is 2 or more, the substituents (Rb$_{2}$ ) which are present in plural numbers may be the same as or different from each other, and further, the substituents (Rb$_{2}$ ) which are present in plural numbers may be bonded to each other to form a ring. 

The repeating unit having a lactone structure usually has an optical isomer, and any optical isomer may be used. Further, one kind of optical isomer may be used singly or a plurality of optical isomers may be mixed and used. In a case of mainly using one kind of optical isomer, the optical purity ( ee) thereof is preferably 90% or more, and more preferably 95% or more. 

The resin (A) may or may not contain a repeating unit having a lactone structure, but in a case where the resin (A) contains the repeating unit having a lactone structure, the content of the repeating unit in the resin (A) is preferably in the range of 1 % to 70% by mole, more preferably in the range of3% to 50% by mole, and still more preferably in the range of 5% to 45% by mole, with respect to the total content of all repeating units. 

Specific examples of the repeating unit having a lactone structure in the resin (A) are shown below, but the present invention is not limited thereto. In the formulae, Rx repre› sents H, CH$_{3}$ , CH$_{2}$OH, or CF$_{3}$ . 

<img src='content_image/915927.jpg'>

-continued 

LCl-15 

LCl-16 

LCl-17 

