Polyfunctional polymer and method for producing same

Patent metadata

Field	Value
Publication number	US-10577438-B2
Application number	US-201615758013-A
Country	US
Kind code	B2
Filing date	Jul 15, 2016
Priority date	Sep 16, 2015
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

The present invention is a method for producing a polyfunctional polymer that contains a structural unit having a urethane bond and a polymerizable unsaturated bond in a side chain, and is characterised by including a reaction process in which a polymer (P) containing a structural unit (a) having a hydroxy group in a side chain and a monomer (M) having an isocyanate group and a polymerizable unsaturated bond are reacted in the presence of a bismuth carboxylate.

First claim

The invention claimed is:

1. A method for producing a polyfunctional polymer comprising a structural unit having a urethane bond and a polymerizable unsaturated bond in a side chain, characterised by comprising a reaction process in which a polymer (P) comprising a structural unit (a) having a hydroxy group in a side chain and a monomer (M) having an isocyanate group and a polymerizable unsaturated bond are reacted in the presence of a bismuth carboxylate,
wherein a molar ratio (M NCO /P OH ) of an isocyanate group in the monomer (M) to a hydroxy group in the polymer (P) is in a range from 0.1 to 1 in the reaction process,
wherein the monomer (M) is at least one compound selected from a group consisting of 2-methacryloyloxyethyl isocyanate, 2-acryloyloxyethyl isocyanate, 1,1-(bis acryloyloxymethyl)ethyl isocyanate and 2-[(3,5-dimethylpyrazolyl)carboxyamino]ethyl methacrylate,
wherein a content ratio of the structural unit (a) in the polymer (P) is in a range from 1% to 20% by mass, and
wherein the structural unit (a) contains a structure represented by a following formula (1):

wherein R 1 is a hydrogen atom or a methyl group, and R 2 is a hydroxy group containing hydrocarbon group having 1 to 24 carbon atoms in which at least one hydrogen atom is substituted with a hydroxy group.

2. The method according to claim 1 , wherein the bismuth carboxylate is a compound that is represented by Bi(OOCR 20 ) 3 ,
wherein each of three R 20 s is independently a hydrocarbon group having 1 to 17 carbon atoms.

3. The method according to claim 1 , wherein the bismuth carboxylate is used in an amount from 0.001 to 5 parts by mass based on 100 parts by mass of the polymer (P).

4. A polyfunctional polymer obtained by the method according to claim 1 .

Assignees

• Mitsui Chemicals Tohcello Inc

Inventors

• Kurihara Hiroyoshi
• SAITO Manami

Classifications

• C09D175/16

  having terminal carbon-to-carbon unsaturated bonds · CPC title

• C08F265/06 Primary

  Polymerisation of acrylate or methacrylate esters on to polymers thereof · CPC title

• C09J175/16

  having terminal carbon-to-carbon unsaturated bonds · CPC title

• C08G2170/40

  Compositions for pressure-sensitive adhesives · CPC title

• C08J3/24

  Crosslinking, e.g. vulcanising, of macromolecules (mechanical aspects B29C35/00; crosslinking agents C08K) · CPC title