JPWO2021200540A5 - - Google Patents

Claims (10)

a step (I-2) of obtaining a base polymer by polymerizing a monomer component containing an N-substituted maleimide monomer (a) and an unsaturated carboxylic acid monomer (b);
Glycidyl (meth)acrylate having a chlorine content adjusted to 0.01 to 0.3% by mass is reacted with the base polymer to obtain an N-substituted maleimide polymer having double bonds in side chains. A method for producing an N-substituted maleimide polymer, comprising step (I-3). Before the step (I-2), the step (I-1) of purifying glycidyl (meth)acrylate so that the chlorine content in the glycidyl (meth)acrylate is 0.01 to 0.3% by mass. ), the method for producing an N-substituted maleimide polymer according to claim 1, further comprising: A monomer component containing an N-substituted maleimide monomer (a) and glycidyl (meth)acrylate having a chlorine content adjusted to 0.01 to 0.3% by mass is polymerized to obtain a base polymer. Step (II-2), and
A step (II-3) of reacting the base polymer with an unsaturated carboxylic acid monomer (b) to obtain an N-substituted maleimide polymer having a double bond in a side chain (II-3). A method for producing an N-substituted maleimide polymer. Before the step (II-2), the step (II-1) of purifying glycidyl (meth)acrylate so that the chlorine content in the glycidyl (meth)acrylate is 0.01 to 0.3% by mass. ), the method for producing an N-substituted maleimide polymer according to claim 3, further comprising: After the step (II-3), there is further a step (II-4) of reacting the N-substituted maleimide polymer having a double bond in the side chain with a polybasic acid or a polybasic acid anhydride. The method for producing an N-substituted maleimide polymer according to claim 3 or 4, characterized in that: The claim characterized in that the amount of residual chlorine in the N-substituted maleimide polymer is 100 to 2000 ppm with respect to the total amount of the N-substituted maleimide monomer (a) and glycidyl (meth)acrylate used. Item 6. A method for producing an N-substituted maleimide polymer according to any one of items 1 to 5. An N-substituted maleimide polymer having a structural unit (A) derived from an N-substituted maleimide monomer and a structural unit (B) represented by the following general formula (B1), (B2) or (B3) There is
The structural unit (B) contains a structure derived from glycidyl (meth)acrylate,
The amount of residual chlorine in the N-substituted maleimide-based polymer is determined by the N-substituted maleimide monomer that provides the structural unit (A) and glycidyl (meth)acrylate that provides the structural unit (B), which are raw materials for the polymer. 100 to 2000 ppm based on the total mass of the N-substituted maleimide polymer.

(In general formula (B1), R ¹ and R ³ are the same or different and represent a hydrogen atom or a methyl group. R ² represents a divalent bonding group. a is 0 or 1;
In general formula (B2), ^R4 represents a hydrogen atom or a methyl group. R5 represents an ethylenically unsaturated bond ^- containing group.
^In general formula (B3), R6 represents a hydrogen atom or a methyl group. ^R7 represents an ethylenically unsaturated bond-containing group. X represents a divalent hydrocarbon group. ) 8. The N-substituted maleimide polymer according to claim 7, wherein the N-substituted maleimide polymer has an acid value of 20 to 200 mgKOH/g. 9. The N-substituted maleimide polymer according to claim 7, wherein the N-substituted maleimide polymer has a double bond equivalent weight of 300 to 3000 g/equivalent. A curable resin composition comprising the N-substituted maleimide polymer according to any one of claims 7 to 9 and a polymerizable compound.