Ethylene alpha-olefin non-conjugated polyene copolymer, use thereof, and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11613595-B2
Application number	US-202017133253-A
Country	US
Kind code	B2
Filing date	Dec 23, 2020
Priority date	Feb 13, 2014
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

The purpose of the present invention is to obtain an ethylene⋅α-olefin⋅non-conjugated polyene copolymer that has a low permanent compression set at low temperatures, is flexible, and has an excellent balance of rubber elasticity at low temperatures and tensile strength at normal temperatures. This ethylene-based polymer is an ethylene⋅α-olefin⋅non-conjugated polyene copolymer that includes units derived from ethylene (A), units derived from an α-olefin (B) containing 4-20 carbon atoms, and units derived from a non-conjugated polyene (C) and satisfies (1)-(4). (1) The molar ratio of (A) to (B) is 40/60-90/10, (2) the contained amount of the units derived from (C) is 0.1-6.0 mol %, (3) ML (1+4) 125° C. is 5-100, and (4) the B value is 1.20 or more.

First claim

The invention claimed is:

1. A cross-linked foam obtaining by cross-linking and foaming a composition comprising:
an ethylene⋅α-olefin⋅non-conjugated polyene copolymer (1); and
an ethylene⋅α-olefin⋅non-conjugated polyene copolymer (2) comprising a structural unit derived from ethylene [A′], a structural unit derived from a C 3 -C 20 α-olefin [B′] and a structural unit derived from a non-conjugated polyene [C′], and satisfying the following (I):
(I) the B value represented by the following equation (i) is less than 1.20:
B value=([ EX ]+2[ Y ])/[2×[ E ]×([ X ]+[ Y ])]  (i)

wherein [E], [X] and [Y] represent a mole fraction of the ethylene [A′], the C 3 -C 20 α-olefin [B′] and the non-conjugated polyene [C′] respectively, and [EX] represents an ethylene [A′]-C 3 -C 20 α-olefin [B′] diad chain fraction;
wherein the ethylene⋅α-olefin⋅non-conjugated polyene copolymer (1) comprises a structural unit derived from an ethylene [A], a structural unit derived from a C 4 -C 20 α-olefin [B] and a structural unit derived from a non-conjugated polyene [C], and satisfying the following (1) to (4):
(1) a molar ratio ([A]/[B]) of the structural units derived from the ethylene [A] to the structural units derived from the α-olefin [B] is 48.3/51.7 to 70.2/29.8;
(2) a content of the structural units derived from the non-conjugated polyene [C] is 1.24 to 3.22 mol % based on the total of the structural units of [A], [B] and [C] as 100 mol %;
(3) a Mooney viscosity ML (1+4) 125° C. at 125° C. is 5 to 100; and
(4) a B value represented by the following formula (i) is in the range of 1.28 to 1.29:
B value=([ EX ]+2[ Y ])/[2×[ E ]×([ X ]+[ Y ])]  (i),

wherein [E], [X] and [Y] represent a mole fraction of the ethylene [A], the C 4 -C 20 α-olefin [B] and the non-conjugated polyene [C] respectively, and [EX] represents an ethylene [A]-C 4 -C 20 α-olefin [B] diad chain fraction,
wherein the C 4 -C 20 α-olefin [B] is 1-butene, and,
wherein the non-conjugated polyene [C] is 5-ethylidene-2-norbornene; and
wherein a mass ratio [(1)/(2)] of the ethylene α-olefin non-conjugated polyene copolymer (1) to the ethylene α-olefin non-conjugated polyene copolymer (2) is 20/80 to 30/70.

2. A sound insulation material composed of the cross-linked foam according to claim 1 .

Assignees

• Mitsui Chemicals Inc

Inventors

• Endo Koji
• Hiwara Mayumi
• Matsuura Sadahiko
• Mizobuchi Yusuke
• Yamamura Yuichi
• Noguchi Yuji
• Ishii Yuji
• Sakai Tatsuya
• Shishido Keisuke
• Ichino Kotaro
• Inomata Kiyohide
• Takeuchi Fumito
• Ide Kenta

Classifications

• C08F4/65912

  in combination with an organoaluminium compound · CPC title

• C08F4/64

  Titanium, zirconium, hafnium or compounds thereof · CPC title

• C08F4/65908

  in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+ · CPC title

• C08F210/18 Primary

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

• C08F4/65927

  two cyclopentadienyl rings being mutually bridged · CPC title