P-HYDROXYSTYRENE-HYDROXY-ALPHA=METHYLSTYRENE BLOCK COPOLYMER PARTIALLY ESTERIFIED WITH T-BUTOCARBOXYL GROUP AND ITS PRODUCTION

Title:

P-HYDROXYSTYRENE-HYDROXY-ALPHA=METHYLSTYRENE BLOCK COPOLYMER PARTIALLY ESTERIFIED WITH T-BUTOCARBOXYL GROUP AND ITS PRODUCTION

Document Type and Number:

Japanese Patent JPH0632850

Kind Code:

A

Abstract:

PURPOSE: To obtain the subject copolymer having a narrow mol.wt. distribution, capable of being developed with an alkali, having a high developing property and a high resolving property, and useful for resist materials, etc., by t- butoxycarbonylating the hydroxyl groups of the polyhydroxystyrene parts, etc., in a specific copolymer.

CONSTITUTION: The hydroxyl groups of the poly p-hydroxystyrene parts and the poly p-hydroxy-α-methylstyrene parts in a singly dispersible p- hydroxystyrene-p-hydroxy-α-methylstyrene block copolymer having a weight- average mol.wt. (Mw)/number-average mol.wt. (Mn) of 1.01-1.5 are partially t-butoxycarbonylated to provide the objective copolymer having repeating units of formulas I, II, III and IV.

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Inventors:

WATANABE OSAMU
YAMADA MOTOYUKI
YAGIHASHI FUJIO

Application Number:

JP21467492A

Publication Date:

February 08, 1994

Filing Date:

July 20, 1992

Export Citation:

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Assignee:

SHINETSU CHEMICAL CO

International Classes:

C08F8/14; C08F297/02; (IPC1-7): C08F297/02; C08F8/14

Attorney, Agent or Firm:

Takashi Kojima

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