1-butane-α-olefin copolymer composition

Patent metadata

Field	Value
Publication number	US-10017591-B2
Application number	US-201615296655-A
Country	US
Kind code	B2
Filing date	Oct 18, 2016
Priority date	Sep 14, 2012
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

An object of the invention is to provide compositions which have low-temperature heat sealing properties, are free from stickiness, may achieve a heat seal strength controlled within a certain definite range when heat sealing takes place at low temperatures, have small changes in heat seal strength with time, and are such that in the packaging applications, the strength required to open the packages may be easily controlled within a certain definite range, and high-performance packages may be designed. The invention resides in a 1-butene.α-olefin copolymer composition including 99 to 1 parts by mass of at least one olefin polymer (X) selected from propylene polymers (X-1) and ethylene polymers (X-2), and 1 to 99 parts by mass of a 1-butene.α-olefin copolymer (Y) containing 0.1 to 30 mol % of one or more α-olefins selected from α-olefins and having a molecular weight distribution (Mw/Mn) of 1.0 to 3.5 [wherein the total of (X) and (Y) in the composition is 100 parts by mass].

First claim

The invention claimed is:

1. A 1-butene.α-olefin copolymer comprising 99.9 to 70 mol % of 1-butene and 0.1 to 30 mol % of one or more α-olefins selected from ethylene, propylene and C5 to C12 α-olefins (wherein the total of the 1-butene and the one or more α-olefins selected from ethylene, propylene and C5 to C12 α-olefins is 100 mol %), having a molecular weight distribution (Mw/Mn) of 1.0 to 3.5, having a pentad isotacticity (mmmm) of 80 to 96.5% and having an elution amount using o-dichlorobenzene at −10° C. of not more than 3 mass %.

2. The 1-butene.α-olefin copolymer according to claim 1 , which has a weight average molecular weight (Mw) is 2×10 5 to 7×10 5 g/mole.

3. The 1-butene.α-olefin copolymer according to claim 1 , which comprises 99.9 to 85 mol % of 1-butene and 0.1 to 15 mol % of ethylene (wherein the total of the 1-butene and the ethylene is 100 mol %).

4. The 1-butene.α-olefin copolymer according to claim 1 , which comprises 99.9 to 70 mol % of 1-butene and 0.1 to 30 mol % of propylene (wherein the total of the 1-butene and the propylene is 100 mol %).

5. A 1-butene.α-olefin copolymer comprising 99.9 to 70 mol % of 1-butene and 0.1 to 30 mol % of propylene (wherein the total of the 1-butene and the propylene is 100 mol %), having a molecular weight distribution (Mw/Mn) of 1.0 to 3.5, and having a pentad isotacticity (mmmm) of 80 to 96.5%, wherein the total amount of elution using o-dichlorobenzene at temperatures of not more than [Ts]° C. is 1.0 mass % to 5.0 mass % wherein [Ts] is characterized by the equation: [Ts]=[C4]−60 wherein [C4] is the proportion in mol % of 1-butene in the 1-butene.α-olefin copolymer.

Assignees

• Mitsui Chemicals Inc

Inventors

• Akai Ikuo
• Abe Tomohiro
• Yoshimoto Koya
• Yamaguchi Masayoshi
• Tanaka Shinya
• Matsunaga Koji
• Egawa Makoto

Classifications

• C08L2203/162

  sealable films · CPC title

• C08L23/20 Primary

  having four to nine carbon atoms · CPC title

• C08L23/04

  Homopolymers or copolymers of ethene · CPC title

• C08F210/08 Primary

  Butenes · CPC title

• C08L23/06

  Polyethylene · CPC title