Method of preparing graft polymer

Patent metadata

Field	Value
Publication number	US-12559583-B2
Application number	US-202017442416-A
Country	US
Kind code	B2
Filing date	Sep 2, 2020
Priority date	Sep 18, 2019
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

Provided is a method of preparing a graft polymer, which includes: adding a diene-based rubber polymer, a first monomer mixture including a (meth)acrylate-based monomer and an aromatic vinyl-based monomer, and a reactive ultraviolet (UV) stabilizer to a reactor and carrying out polymerization to prepare a composite rubber polymer; and graft-polymerizing a second monomer mixture including a (meth)acrylate-based monomer, an aromatic vinyl-based monomer, and a vinyl cyanide-based monomer to the composite rubber polymer to prepare a graft polymer, wherein the reactive UV stabilizer is added in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of the sum of the diene-based rubber polymer, the first monomer mixture, and the second monomer mixture.

First claim

The invention claimed is:

1 . A method of preparing a graft polymer, comprising:
adding a diene-based rubber polymer, a first monomer mixture including a (meth)acrylate-based monomer and an aromatic vinyl-based monomer, and a reactive ultraviolet (UV) stabilizer to a reactor and carrying out polymerization to prepare a composite rubber polymer; and graft-polymerizing a second monomer mixture including a (meth)acrylate-based monomer, an aromatic vinyl-based monomer, and a vinyl cyanide-based monomer to the composite rubber polymer to prepare the graft polymer, wherein the first monomer mixture includes the (meth)acrylate-based monomer and the aromatic vinyl-based monomer in a weight ratio of 70:30 to 50:50, and wherein, based on 100 parts by weight of the sum of the diene-based rubber polymer, the first monomer mixture, and the second monomer mixture: the reactive ultraviolet (UV) stabilizer is added in an amount of 0.1 to 2 parts by weight, the diene-based rubber polymer is added in an amount of 15 to 25 parts by weight, and the second monomer mixture is added in an amount of 35 to 45 parts by weight.

2 . The method of claim 1 , wherein the reactive UV stabilizer is added in an amount of 0.5 parts by weight to 1.2 parts by weight based on 100 parts by weight of the sum of the diene-based rubber polymer, the first monomer mixture, and the second monomer mixture.

3 . The method of claim 1 , wherein the reactive UV stabilizer is a compound represented by the following Chemical Formula 1:

wherein, in Chemical Formula 1,
R 1 is hydrogen or a C 1 -C 10 linear alkyl group, and
L 1 is a direct bond or a C 1 -C 10 linear alkylene group.

4 . The method of claim 1 , wherein the reactive UV stabilizer is one or more selected from the group consisting of 2-[2′-hydroxy-5′-2-(acryloyloxy)phenyl]-2H-benzotriazole, 2-[2′-hydroxy-5′-2-(methacryloyloxy)phenyl]-2H-benzotriazole, 2-[2′-hydroxy-5′-[2-(acryloyloxy)methyl]phenyl]-2H-benzotriazole, 2-[2′-hydroxy-5′-[2-(methacryloyloxy)methyl]phenyl]-2H-benzotriazole, 2-[2′-hydroxy-5′-[2-(acryloyloxy)ethyl]phenyl]-2H-benzotriazole, 2-[2′-hydroxy-5′-[2-(methacryloyloxy)ethyl]phenyl]-2H-benzotriazole, 2-[2′-hydroxy-5′-[2-(acryloyloxy)propyl]phenyl]-2H-benzotriazole, 2-[2′-hydroxy-5′-[2-(methacryloyloxy)propyl]phenyl]-2H-benzotriazole, 2-[2′-hydroxy-5′-[2-(acryloyloxy)butyl]phenyl]-2H-benzotriazole, 2-[2′-hydroxy-5′-[2-(methacryloyloxy)butyl]phenyl]-2H-benzotriazole, 2-[2′-hydroxy-5′-[2-(acryloyloxy)hexyl]phenyl]-2H-benzotriazole, and 2-[2′-hydroxy-5′-[2-(methacryloyloxy)hexyl]phenyl]-2H-benzotriazole.

5 . The method of claim 1 , wherein, based on 100 parts by weight of the sum of the diene-based rubber polymer, the first monomer mixture, and the second monomer mixture:
the first monomer mixture is added in an amount of 35 to 45 parts by weight.

6 . The method of claim 1 , wherein the diene-based rubber polymer has an average particle diameter of 200 nm to 400 nm.

7 . The method of claim 1 , wherein the composite rubber polymer has an average particle diameter of 250 nm to 450 nm.

8 . The method of claim 1 , wherein the graft polymer has a refractive index of 1.51 to 1.52.

Assignees

• Lg Chemical Ltd

Inventors

• Choi Jeong Su
• Lee Won Seok
• Lee Roo Da
• Park Sang Hoo
• Lee Jong Ju

Classifications

• C08L33/062

  Copolymers with monomers not covered by C08L33/06 · CPC title

• C08F2500/24

  Polymer with special particle form or size · CPC title

• C08F2500/21

  Rubbery or elastomeric properties · CPC title

• C08K5/3475

  condensed with carbocyclic rings · CPC title

• C08F2/44

  Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers · CPC title