Poly(ethylene-aliphatic diene)-g-polystyrene based copolymer having improved mechanical properties and heat resistance and method for preparing same

Patent metadata

Field	Value
Publication number	US-2016168301-A1
Application number	US-201414909167-A
Country	US
Kind code	A1
Filing date	May 23, 2014
Priority date	Aug 16, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

The present invention relates to a poly(ethylene-aliphatic diene)-g-polystyrene-based copolymer having an improved mechanical property and heat resistance, and a method for preparing the same. More particularly, the present invention relates to a poly(ethylene-aliphatic diene)-g-polystyrene-based copolymer, which includes an ethylene-aliphatic diene copolymer as a soft segment and a polystyrene-based polymer grafted to the soft segment as a hard segment, and a method for preparing the same.
The poly(ethylene-aliphatic diene)-g-polystyrene-based copolymer has elasticity equivalent to that of SBS or SEBS, and improved mechanical properties such as tensile strength and heat resistance, thereby being used as a substituent for SBS or SEBS.

First claim

1 . A poly(ethylene-aliphatic diene)-g-polystyrene-based copolymer represented by the following Formula 1:

(wherein, R 1 is a C2-C20 straight or branched chain alkylene group; R 2 is a C1-C10 straight or branched chain alkyl group; and l, m, and n are each independently an integer from 10-10,000).

2 . The poly(ethylene-aliphatic diene)-g-polystyrene-based copolymer of claim 1 , wherein R 1 is a C2-C20 straight or branched chain alkylene group unsubstituted or substituted with a C1-C18 alkyl group, and R 2 is a C2-C20 straight or branched chain alkyl group unsubstituted or substituted with a C1-C18 alkyl group.

3 . The poly(ethylene-aliphatic diene)-g-polystyrene-based copolymer of claim 1 , wherein the weight average molecular weight of the graft copolymer is 20,000-1,500,000 and the molecular weight distribution is 1.2-3.0.

4 . The poly(ethylene-aliphatic diene)-g-polystyrene-based copolymer of claim 1 , wherein the graft copolymer has a graft rate of 0.01-10%.

5 . The poly(ethylene-aliphatic diene)-g-polystyrene-based copolymer of claim 1 , wherein the weight average molecular weight of the poly(ethylene-aliphatic diene) block of the graft copolymer is 10,000-1,000,000 and the weight average molecular weight of the polystyrene-based block is 10,000-800,000.

6 . A method for preparing a poly(ethylene-aliphatic diene)-g-polystyrene-based copolymer of Formula 1 as described in Reaction Formula 1 below, the method comprising:
a) polymerizing ethylene (Formula 2) and an aliphatic diene monomer (Formula 3) to prepare an ethylene-diene copolymer (Formula 4); and b) performing coordination polymerization of a styrene-based monomer (Formula 5) with the ethylene-diene copolymer (Formula 4) in the presence of a metallocene catalyst.

(wherein, R 1 is a C2-C20 straight or branched chain alkylene group; R 2 is a C1-C10 straight or branched chain alkyl group; R 3 is a C2-C20 straight or branched chain alkenyl group; and l, m, and n are each independently an integer from 10-10,000).

7 . The method for preparing a poly(ethylene-aliphatic diene)-g-polystyrene-based copolymer of claim 6 , wherein the aliphatic diene monomer comprises at least one selected from the group consisting of 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,2-dimethyl-1,3-butadiene, 1,4-dimethyl-1,3-butadiene, 1-ethyl-1,3-butadiene, 3-butyl-1,3-octadiene, 1,3-hexadiene, 1,5-hexadiene, 1,9-octadiene, 1,7-octadiene, 1,9-decadiene, 4-methyl-1,3-pentadiene, 1,3-pentadiene, 3-methyl-1,3-pentadiene, 2,4-dimethyl-1,3-pentadiene, 3-ethyl-1,3-pentadiene and combination thereof.

8 . The method for preparing a poly(ethylene-aliphatic diene)-g-polystyrene-based copolymer of claim 6 , wherein the styrene-based monomer comprises at least one selected from the group consisting of styrene, methyl styrene, ethyl styrene, propyl styrene, t-butyl styrene, isopropyl butyl styrene, pentyl styrene, and combination thereof.

9 . The method for preparing a poly(ethylene-aliphatic diene)-g-polystyrene-based copolymer of claim 6 , wherein the metallocene catalyst has a metallocenter, which is group 4 transition metal; the ligand is cyclopentadienyl or a derivative thereof, fluorenyl or a derivative thereof, or indenyl or a derivative thereof; and the catalyst has a bridge (ansa) structure or non-bridge structure.

Assignees

• Korea Ind Tech Inst

Inventors

• Kim Dong Hyun
• Park No Hyung
• Kim Jung Soo
• Jeon Dong Gyu

Classifications

• C08F279/00 Primary

  Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00 · CPC title

• C08F210/18

  with non-conjugated dienes, e.g. EPT rubbers · CPC title

• C08F4/6592

  containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring · CPC title

• C08F255/06 Primary

  on to ethylene-propylene-diene terpolymers {(C08F255/023 takes precedence)} · CPC title

• C08F255/02 Primary

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