content_image/910817.jpg content_image/910818.jpg content_image/910819.jpg content_image/910820.jpg content_image/910816.jpg
(13) A resin comprising: 

at least one repeating unit (A) selected from repeating units represented by any one of the following general formu› lae (III) to (V); 

a repeating unit (B) represented by the following general formula (I); and 

a repeating unit (C) represented by the following general formula (VI): 

<img src='content_image/910817.jpg'>

<img src='content_image/910818.jpg'>

<img src='content_image/910819.jpg'>

wherein 

each ofR$_{04}$, R$_{05 }$and R$_{07 }$to R$_{09 }$independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, a halogen atom, a cyano group or an alkoxycarbonyl group; 

Ra$_{6 }$ represents a cyano group, a carboxyl group, -CO- OR$_{25 }$or----CO-N(R$_{26}$)(R$_{27}$), and R$_{26 }$and R$_{27 }$may be bonded to each other to form a ring together with a nitrogen atom; 

R$_{25 }$represents an alkyl group, a cycloalkyl group, an alk› enyl group, an aryl group or an aralkyl group; 

each ofR$_{26}$ , R $_{27 }$and R$_{33 }$independently represents a hydro› gen atom, an alkyl group, a cycloalkyl group, an alkenyl group, an aryl group or an aralkyl group; and 

A represents an ionic structural site capable of decompos- ing upon irradiation with an actinic ray or radiation to generate an acid anion in a side chain of the resin, 

<img src='content_image/910820.jpg'>

wherein 

each ofR$_{0}$ i, R$_{02 }$and R$_{03 }$independently represents a hydro› gen atom, an alkyl group, a cycloalkyl group, a halogen atom, a cyano group or an alkoxycarbonyl group, and R$_{03 }$also may represent an alky lene group and be bonded toAr$_{1 }$to form a 5-memberedring ora 6-memberedring; 

Ar $_{1 }$represents an aromatic ring group; 

each of n Y s independently represents a hydrogen atom or a group capable of leaving by the action of an acid, provided that at least one of Y s represents a group capable of leaving by the action of an acid; and 

n represents an integer of from 1 to 4, and 

<img src='content_image/910816.jpg'>

wherein 

each ofR$_{0}$ i, R$_{02 }$and R$_{03 }$independently represents a hydro› gen atom, an alkyl group, a cycloalkyl group, a halogen atom, a cyano group or an alkoxycarbonyl group, and R$_{03 }$also may represent an alky lene group and be bonded toAr$_{1 }$to form a 5-memberedring ora 6-memberedring; 

Ar $_{1 }$represents an aromatic ring group; and 

n represents an integer of from 1 to 4. 

(14) A method for producing the compound (P) as set forth in (1 ). 

(15) A method for producing the resin (P) as set forth in (2). 

(16) A method for producing the resin as set forth in (13 ). 

## BRIEF DESCRIPTION OF DRAWINGS 

FIG. 1 is a graph showing an NMR data of the resin (P-1) synthesized in Synthetic Example 10. 

## DESCRIPTION OF EMBODIMENTS 

The invention is hereunder described in detail. 

As to the expression of a group ( atomic group) in the specification, the term "group" which does not express whether it is substituted or unsubstituted includes both one not having a substituent and one having a substituent. For example, the term "alkyl group" includes not only an alkyl group not having a substituent ( an unsubstituted alkyl group) but an alkyl group having a substituent (a substituted alkyl group). 

<Compound (P)> 

The compound (P) contained in the radiation-sensitive composition is a compound having a partial structure (A) having an ionic structural site and capable of decomposing upon irradiation with an actinic ray or radiation to generate an acid; and a partial structure (B) having at least one phenolic hydroxyl group, a part or all of hydrogen atoms of the hydroxyl group or groups each being protected by a group capable of leaving by the action of an acid, wherein the ionic structural site of the partial structure (A) is a structure capable of generating an acid anion in the compound (P) upon irra› diation with an actinic ray or radiation. 

Examples of a skeleton of the compound (P) include struc- tures having plural benzene rings and structures having a cycloalkane structure. More specific examples of the skeleton include structures disclosed in JP-A-2001-312055, US-A- 

