Matrix copolymer, graft copolymer, and thermoplastic resin composition

Patent metadata

Field	Value
Publication number	US-11434358-B2
Application number	US-201916646127-A
Country	US
Kind code	B2
Filing date	May 14, 2019
Priority date	May 14, 2018
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

The present invention relates to a matrix copolymer including a cellulose nanocrystal derivative, an alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; a graft copolymer including a cellulose nanocrystal derivative, a conjugated diene-based polymer, an alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; and a thermoplastic resin composition including at least one thereof. In accordance with the present invention, provided is a thermoplastic resin composition having improved processability, impact strength, tensile strength and chemical resistance while maintaining transparency.

First claim

The invention claimed is:

1. A matrix copolymer, comprising:
a cellulose nanocrystal derivative;
an alkyl (meth)acrylate-based monomer unit;
an aromatic vinyl-based monomer unit; and
a vinyl cyan-based monomer unit,
wherein the cellulose nanocrystal derivative is formed through a reaction between a cellulose nanocrystal and one or more selected from the group consisting of an alkyl (meth)acrylate-based monomer, an aromatic vinyl-based monomer, and a vinyl cyan-based monomer added during preparation of the matrix copolymer.

2. The matrix copolymer according to claim 1 , wherein the matrix copolymer has a refractive index of 1.51 to 1.52.

3. The matrix copolymer according to claim 1 , wherein the cellulose nanocrystal has a refractive index of 1.4 to 1.5.

4. The matrix copolymer according to claim 1 , wherein the cellulose nanocrystal are secondary particles comprising a plurality of primary particles,
wherein the primary particles have an average diameter of 5 to 20 nm and an average length of 50 to 200 nm, and
the secondary particles have an average diameter of 100 to 200 nm.

5. A graft copolymer, comprising:
a cellulose nanocrystal derivative;
a conjugated diene-based polymer;
an alkyl (meth)acrylate-based monomer unit;
an aromatic vinyl-based monomer unit; and
a vinyl cyan-based monomer unit,
wherein the cellulose nanocrystal derivative is formed through a reaction between a cellulose nanocrystal and one or more selected from the group consisting of the conjugated diene-based polymer, an alkyl (meth)acrylate-based monomer, an aromatic vinyl-based monomer, and a vinyl cyan-based monomer added to prepare the graft copolymer.

6. The graft copolymer according to claim 5 , wherein the graft copolymer has a refractive index of 1.51 to 1.52.

7. The graft copolymer according to claim 5 , wherein the cellulose nanocrystal has a refractive index of 1.4 to 1.5.

8. The graft copolymer according to claim 5 , wherein the cellulose nanocrystal are secondary particles comprising a plurality of primary particles,
wherein the primary particles have an average diameter of 5 to 20 nm and an average length of 50 to 200 nm, and
the secondary particles have an average diameter of 100 to 200 nm.

9. A thermoplastic resin composition, comprising:
a matrix copolymer comprising an alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; and
a graft copolymer comprising a conjugated diene-based polymer, an alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit,
wherein at least one of the matrix copolymer and the graft copolymer further comprises a cellulose nanocrystal derivative, and
wherein the cellulose nanocrystal derivative is formed through a reaction between a cellulose nanocrystal and one or more selected from the group consisting of the conjugated diene-based polymer, an alkyl (meth)acrylate-based monomer, an aromatic vinyl-based monomer, and a vinyl cyan-based monomer added during preparation of the matrix copolymer or the graft copolymer.

10. The thermoplastic resin composition according to claim 9 , wherein a refractive index difference between the matrix copolymer and the graft copolymer is 0 to 0.008.

Assignees

• Lg Chemical Ltd

Inventors

• Ok Hye Jeong
• Jang Seok Goo
• Park Sang Hoo
• Shim Hyung Seop
• Choi Jeong Su
• Yoo Keun Hoon
• Lee Won Seok
• Lee Roo Da
• Kim Ho Hoon
• Lee Jong Ju

Classifications

• C08L47/00

  Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Compositions of derivatives of such polymers (C08L45/00 takes precedence; of conjugated diene rubbers C08L9/00 - C08L21/00) · CPC title

• C08F220/14 Primary

  Methyl esters {, e.g. methyl (meth)acrylate} · CPC title

• C08F220/44

  Acrylonitrile · CPC title

• C08L33/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08F251/02

  on to cellulose or derivatives thereof · CPC title