Title:
COPOLYMER OF HYDROXYSTYRENE-BASED MONOMER AND (METH)ACRYLIC ACID ESTER-BASED MONOMER, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2023/157901
Kind Code:
A1
Abstract:
[Problem] To provide a method for producing a copolymer of a hydroxystyrene-based monomer and a (meth)acrylic acid ester-based monomer, by which the compositional ratio uniformity and yield of the copolymer can be improved. [Solution] The present invention is a method for producing a copolymer by subjecting at least one type of hydroxystyrene-based monomer and at least one type of (meth)acrylic acid ester-based monomer to a polymerization reaction in the presence of a radical polymerization initiator and a solvent, the method being characterized in that the hydroxystyrene-based monomer is a hydroxystyrene compound in which the number of hydroxyl groups is 1-3 or a derivative in which at least some of the hydroxyl groups in these hydroxystyrene compounds are protected by groups that are dissociated by the action of an acid or a base, and the polymerization reaction is carried out while averaging differences in consumption rates of the monomers under conditions (1) to (4). (1) A plurality of monomer solutions which contain the hydroxystyrene-based monomer and the (meth)acrylic acid ester-based monomer and in which the compositional ratio of these monomers is different are prepared. Among the plurality of monomer solutions, a solution having the lowest compositional ratio of the monomer having the highest reactivity is denoted as a first monomer solution, a solution in which the compositional ratio of the monomer having the highest reactivity is at least 5 mol% higher than in the first monomer solution is denoted as an nth monomer solution (n is an integer of 2 or more), and the amount of monomer contained in the first monomer solution is 5-33 mol% of the total monomer amount. (2) The first monomer solution is initially supplied to a reaction vessel, and the nth monomer solutions are then successively supplied into the reaction vessel. (3) The compositional ratio of the monomer having the highest reactivity in the reaction system at the start point of the polymerization reaction is adjusted so as to be 30-90% of the compositional ratio of the monomer having the highest reactivity among all monomers. (4) At a point where the supply of all the monomer solutions is complete, the conversion rate of the monomer having the lowest reactivity is 75% or more.
Inventors:
OIKAWA TOMO (JP)
NARITA AZUMI (JP)
NARITA AZUMI (JP)
Application Number:
PCT/JP2023/005376
Publication Date:
August 24, 2023
Filing Date:
February 16, 2023
Export Citation:
Assignee:
MARUZEN PETROCHEM CO LTD (JP)
International Classes:
C08F2/00; C08F212/14; C08F220/10
Domestic Patent References:
| WO2012053434A1 | 2012-04-26 |
Foreign References:
| US20090076230A1 | 2009-03-19 | |||
| JP2001151823A | 2001-06-05 | |||
| JP2019059957A | 2019-04-18 | |||
| JP2010202699A | 2010-09-16 | |||
| JP2012087186A | 2012-05-10 | |||
| JP2004231950A | 2004-08-19 | |||
| JP2003171422A | 2003-06-20 | |||
| JPS61291606A | 1986-12-22 | |||
| JP2009102659A | 2009-05-14 |
Attorney, Agent or Firm:
MIYAJIMA Manabu et al. (JP)
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