Acrylic processing aid, method for preparing the same and polyvinylchloride resin composition comprising the same

• US 10,640,636 B2
• Filed: 11/16/2018
• Issued: 05/05/2020
• Est. Priority Date: 05/24/2016
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kim, Yoon Ho, Kim, Geon Soo, Lee, Chang No
• Primary Examiner(s): Nutter, Nathan M
• Application Number:
  US16/193,682
• Publication Number:
  US 20190085161A1
• Time in Patent Office: 536 Days
• CPC Class Codes: C08J 2201/03 Extrusion of the foamable blend
• CPC Class Codes: C08J 2203/04 N2 releasing, ex azodicarbonamide or nitroso compound
• CPC Class Codes: C08J 2327/06 Homopolymers or copolymers of vinyl chloride
• CPC Class Codes: C08J 2433/12 Homopolymers or copolymers of methyl methacrylate
• CPC Class Codes: C08J 2451/00 Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds for ABS polymers C08J2455/02; Derivatives of such polymers
• CPC Class Codes: C08J 9/0061 characterized by the use of several polymeric components
• CPC Class Codes: C08J 9/103 Azodicarbonamide
• CPC Class Codes: C08L 2203/14 used for foams
• CPC Class Codes: C08L 2205/06 having improved processability or containing aids for moulding methods
• CPC Class Codes: C08L 2207/53 Core-shell polymer
• CPC Class Codes: C08L 27/06 Homopolymers or copolymers of vinyl chloride
• CPC Class Codes: C08L 51/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C08L51/04, C08L51/06 take precedence

Abstract

[Summary]

The present invention relates to an acrylic processing aid, a method for preparing the same, and a polyvinyl chloride resin composition comprising the same. More specifically, the present invention relates to an acrylic processing aid having a core-shell structure comprising the core and shell comprise a polymer prepared by copolymerizing a methyl methacrylate monomer and an alkyl acrylate monomer having 1 to 18 carbon atoms, and wherein the core comprises the polymer having a weight-average molecular weight ranging from 10,000,000 to 18,000,000 g/mol, a method for preparing the same, and a polyvinyl chloride resin composition comprising the same.

Claims

1. A method for preparing an acrylic processing aid having a core-shell structure comprising:

polymerizing a methyl methacrylate monomer and an alkyl acrylate monomer having 1 to 18 carbon atoms to prepare a polymer for the core; and

polymerizing the core, a methyl methacrylate monomer and an alkyl acrylate monomer having 1 to 18 carbon atoms to prepare the core-shell structure,

wherein the polymer for the core has a weight-average molecular weight ranging from 10,000,000 to 18,000,000 g/mol.

2. The method for preparing the acrylic processing aid according to claim 1, wherein the core comprises 70 to 99% by weight of the methyl methacrylate monomer and 1 to 30% by weight of the alkyl acrylate monomer having 1 to 18 carbon atoms, based on a total weight of the monomers constituting the core.

3. The method for preparing the acrylic processing aid according to claim 1, wherein the shell comprises a polymer having a weight-average molecular weight ranging from 200,000 to 2,000,000 g/mol, wherein the polymer is prepared by polymerizing the methyl methacrylate monomer and the alkyl acrylate monomer having 1 to 18 carbon atoms.

4. The method for preparing the acrylic processing aid according to claim 1, wherein the shell comprises 20 to 40% by weight of the methyl methacrylate monomer and 40 to 80% by weight of the alkyl acrylate monomer having 1 to 18 carbon atoms, based on a total weight of the monomers constituting the shell.

5. The method for preparing the acrylic processing aid according to claim 1, wherein the alkyl acrylate monomer having 1 to 18 carbon atoms comprises at least one selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, hexyl acrylate, octyl acrylate, lauryl acrylate, stearyl acrylate, 2-ethylhexyl acrylate and cyclohexyl acrylate.

6. The method for preparing the acrylic processing aid according to claim 1, wherein at least one of the core and shell further comprises a vinyl monomer.

7. The method for preparing the acrylic processing aid according to claim 6, wherein the vinyl monomer comprises at least one selected from the group consisting of styrene, α

-methylstyrene, p-methylstyrene, o-ethylstyrene, p-ethylstyrene, vinyltoluene, acrylonitrile, methacrylonitrile and ethacrylonitrile.

8. The method for preparing the acrylic processing aid according to claim 6, wherein the vinyl monomer is comprised in an amount of 0 to 20% by weight, based on a total weight of the monomers constituting the core or shell.

9. The method for preparing the acrylic processing aid according to claim 1, wherein the acrylic processing aid comprises 75 to 95% by weight of the core and 5 to 25% by weight of the shell, based on a total weight of the acrylic processing aid.

10. The method for preparing the acrylic processing aid according to claim 1, wherein the acrylic processing aid has an average particle diameter ranging from 70 to 250 nm.

13. The method for preparing the acrylic processing aid according to claim 1, further comprising aggregating the core-shell structure.

11. A polyvinyl chloride resin composition comprising the acrylic processing aid having the core-shell structure,

wherein both the core and shell comprise a polymer prepared by copolymerizing a methyl methacrylate monomer and an alkyl acrylate monomer having 1 to 18 carbon atoms, and

wherein the core comprises the polymer having a weight-average molecular weight ranging from 10,000,000 to 18,000,000 g/mol.

12. The polyvinyl chloride resin composition according to claim 11, wherein the acrylic processing aid is comprised in an amount of 0.1 to 30 parts by weight, based on 100 parts by weight of the polyvinyl chloride resin composition.