Crosslinked product, method for producing the same and the use thereof, and ethylene copolymer

Patent metadata

Field	Value
Publication number	US-10004293-B2
Application number	US-201515109926-A
Country	US
Kind code	B2
Filing date	Feb 4, 2015
Priority date	Feb 28, 2014
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

The present method for producing a crosslinked product include the steps of: melt molding an ethylene copolymer (A) or a resin composition containing the ethylene copolymer (A); and carrying out crosslinking; wherein the ethylene copolymer (A) contains a constitutional unit derived from ethylene and a constitutional unit derived from an α-olefin having 3 to 20 carbon atoms, and satisfies the following requirements (1), (2) and (3): (1) a vinyl group content per 1,000 carbon atoms as measured by 1 H-NMR is from 0.06 to 1; (2) a ratio MFR 10 /MFR 2.16 is from 8.5 to 50; and (3) a density d is from 850 kg/m 3 to 920 kg/m 3 . The present method for producing a crosslinked product is capable of providing a crosslinked product having a good moldability and an excellent mechanical strength. Further, the present method is capable of providing a foamed product which is light weight and excellent in mechanical strength, with an excellent productivity; as well as providing crosslinked molded articles whose dimensional variations between individual products are small.

First claim

The invention claimed is:

1. A method for producing a crosslinked product, comprising the steps of:
melt molding an ethylene copolymer (A) or a resin composition containing the ethylene copolymer (A); and
carrying out crosslinking;
wherein the ethylene copolymer (A) contains a constitutional unit derived from ethylene and a constitutional unit derived from an α-olefin having from 3 to 20 carbon atoms, and satisfies all of the following requirements (1), (2) and (3):
(1) a vinyl group content per 1,000 carbon atoms as measured by 1 H-NMR is 0.09 or more and one or less;
(2) a ratio MFR 10 /MFR 2.16 is 8.6 or more and 50 or less; and
(3) a density d is 850 kg/m 3 or more and 920 kg/m 3 or less
(wherein, MFR 10 represents a melt flow rate (g/10 min) as measured in accordance with ASTM D1238 at a load of 10 kg and at a temperature of 190° C.; and MFR 2.16 represents a melt flow rate (g/10 min) as measured in accordance with ASTM D1238 at a load of 2.16 kg and at a temperature of 190° C.).

2. The method for producing a crosslinked product according to claim 1 , wherein the ethylene copolymer (A) further satisfies the following requirement (4):
(4) MFR 2.16 is within the range of from 0.01 to 200 g/10 min.

3. The method for producing a crosslinked product according to claim 1 or 2 , wherein the ethylene copolymer (A) is an ethylene copolymer (A1) comprising ethylene-derived structural units and α-olefin-derived structural units alone as structural units.

4. The method for producing a crosslinked product according to claim 1 , further comprising the step of carrying out foaming.

5. The method for producing a crosslinked product according to claim 1 , wherein the step of melt molding is carried out by injection molding or transfer molding, and wherein the method further comprises the step of carrying out foaming.

6. A laminated molded article comprising a layer composed of one or more kinds of raw materials selected from the group consisting of polyolefin, polyurethane, rubber, leather and artificial leather, and the crosslinked product according to claim 1 , wherein the layer composed of one or more kinds of raw materials and the crosslinked product are laminated together.

7. The laminated molded article according to claim 6 , wherein the laminated molded article is a footwear part.

8. The laminated molded article according to claim 7 , wherein the footwear part is a midsole, an inner sole, or a sole.

9. An ethylene copolymer (A) which contains a constitutional unit derived from ethylene and a constitutional unit derived from an α-olefin having from 3 to 20 carbon atoms, and which satisfies all of the following requirements (1), (2) and (3):
(1) a vinyl group content per 1,000 carbon atoms as measured by 1 H-NMR is 0.09 or more and one or less;
(2) a ratio MFR 10 /MFR 2.16 is 8.6 or more and 50 or less; and
(3) a density d is 850 kg/m 3 or more and 920 kg/m 3 or less
(wherein, MFR 10 represents a melt flow rate (g/10 min) as measured in accordance with ASTM D1238 at a load of 10 kg and at a temperature of 190° C.; and MFR 2.16 represents a melt flow rate (g/10 min) as measured in accordance with ASTM D1238 at a load of 2.16 kg and at a temperature of 190° C.).

10. The ethylene copolymer (A) according to claim 9 , wherein the ethylene copolymer (A) further satisfies the following requirement (4):
(4) MFR 2.16 is within the range of from 0.01 to 200 g/10 min.

11. The ethylene copolymer (A) according to claim 9 or 10 , wherein the ethylene copolymer (A) is an ethylene copolymer (A1) comprising ethylene-derived structural units and α-olefin-derived structural units alone as structural units.

12. An ethylene copolymer composition comprising the ethylene copolymer (A) according to claim 9 and a crosslinking agent (C).

13. The ethylene copolymer composition according to claim 12 , further comprising a foaming agent (D).

Assignees

• Mitsui Chemicals Inc

Inventors

• Nakano Hidetake
• Noda Kiminori
• Yasuda Kazuaki

Classifications

• B29D35/142

  Soles · CPC title

• C08J2203/04

  N2 releasing, ex azodicarbonamide or nitroso compound · CPC title

• C08F210/16 Primary

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title

• C08J9/0061

  characterized by the use of several polymeric components · CPC title

• B32B27/40

  comprising polyurethanes · CPC title