Highly functional graft copolymer and method for preparing the same

Patent metadata

Field	Value
Publication number	US-9803034-B2
Application number	US-201114347212-A
Country	US
Kind code	B2
Filing date	Dec 30, 2011
Priority date	Oct 18, 2011
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

This invention relates to a highly functional graft copolymer and a method of preparing the same, and more particularly, to a highly functional graft copolymer including a main chain of a highly elastic ethylene-based terpolymer including, at a predetermined molar ratio, an ethylene unit, an α-olefin unit having 6 to 12 carbon atoms, and at least one functional unit selected from the group consisting of divinylbenzene and p-methylstyrene, and a side chain of a polar polymer for imparting functionality, and to a method of preparing the highly functional graft copolymer by performing anionic polymerization after catalytic polymerization using a metallocene catalyst.

First claim

The invention claimed is:

1. A graft copolymer, comprising:
a main chain of an ethylene-based terpolymer comprising 80-95 mol % of an ethylene unit, 4-18 mol % of an α-olefin unit having 6 to 12 carbon atoms, and 0.5-2 mol % of p-methylstyrene; and
a side chain of a polar polymer, wherein the polar polymer comprises at least one polar group selected from the group consisting of OH group and NH 2 group, wherein a molecular weight distribution (Mw/Mn) of the graft copolymer is 1-3.5.

2. The graft copolymer of claim 1 , which has a scratch resistance of 13˜20 N determined according to ASTM D7027.

3. The graft copolymer of claim 1 , which has a hardness of 60˜90 A, wherein the hardness is Shore hardness A.

4. A method of preparing a graft copolymer of claim 1 , comprising: polymerizing 80 - 95 mol % of an ethylene monomer, 4-18 mol % of an α-olefin monomer having 6 to 12 carbon atoms, and 0.5-2 mol % of p-methylstyrene using a metallocene catalyst (step 1) to provide a polymer; and
adding the polymer obtained in step 1 with a polar monomer and performing anionic polymerization (step 2) to provide the graft copolymer having a molecular weight distribution(Mw/Mn) of 1-3.5, wherein the polar monomer is a polar monomer having at least one polar group selected from the group consisting of OH group and NH2 group.

5. The method of claim 4 , wherein the metallocene catalyst has a center metal comprising a Group 4 transition metal and a ligand comprising cyclopentadienyl or a derivative thereof fluorenyl or a derivative thereof or indenyl or a derivative thereof and has a bridge (ansa) structure or a non-bridge structure.

6. The method of claim 5 , wherein the metallocene catalyst has a center metal of Ti or Zr and a ligand of indenyl or its derivative, and has a bridge (ansa) structure.

7. The method of claim 4 , wherein a catalytic activity upon polymerizing is 2,500˜15,000.

8. The method of claim 4 , wherein the metallocene catalyst is used together with an alkyl aluminoxane cocatalyst, an organic alkyl aluminum cocatalyst, a boron compound cocatalyst, or mixtures thereof.

9. The method of claim 8 , wherein the alkyl aluminoxane cocatalyst is selected from the group consisting of methyl aluminoxane, ethyl aluminoxane, propyl aluminoxane, butyl aluminoxane and isobutyl aluminoxane;
the organic alkyl aluminum cocatalyst is selected from the group consisting of trimethylaluminum, triethylaluminum and diisobutylaluminum chloride; and
the boron compound cocatalyst is selected from the group consisting of tris(pentafluorophenyl)borane, N,N-dimethylanilium tetrakis(pentafluorophenyl)borate, and triphenylmethyliniumtetrakispentafluoroborate.

10. The method of claim 4 , wherein the polymerizing in step 1 is performed at 20˜70° C.

11. The method of claim 4 , wherein the polymerizing in step 1 is performed for a period of time ranging from 20 min to 1 hr.

12. The method of claim 4 , wherein an initiator for the anionic polymerization in step 2 is at least one selected from the group consisting of an alkali metal suspension, an alkyl lithium reagent, an aryl lithium reagent, a Grignard reagent, alkylated aluminum, an organic radical anion, a transition metal π-allyl complex and an ionization radiation.

13. The method of claim 4 , wherein the polymerization in step 2 is performed at −20˜0° C.

14. The method of claim 4 , wherein the polymerization in step 2 is performed for a period of time ranging from 20 min to 3 hr.

Assignees

• Kim Dong Hyun
• Lee Joon Chul
• Kim Hyun Ki
• Kim Tae Wan
• Korea Ind Tech Inst

Inventors

• Kim Dong Hyun
• Lee Joon Chul
• Kim Hyun Ki
• Kim Tae Wan

Classifications

• C08F220/16 Primary

  of phenols or of alcohols containing two or more carbon atoms · CPC title

• C08F4/52 Primary

  selected from boron, aluminium, gallium, indium, thallium or rare earths (C08F4/14 takes precedence) · CPC title

• C08F220/18

  with acrylic or methacrylic acids · CPC title

• C08F236/08

  Isoprene · CPC title

• C08F255/02

  on to polymers of olefins having two or three carbon atoms · CPC title