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

Patent metadata

Field	Value
Publication number	US-2016331073-A1
Application number	US-201515109926-A
Country	US
Kind code	A1
Filing date	Feb 4, 2015
Priority date	Feb 28, 2014
Publication date	Nov 17, 2016
Grant date	—

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

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 0.06 or more and one or less; (2) a ratio MFR 10 /MFR 2.16 is 8.5 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 , wherein the ethylene copolymer (A) is an ethylene copolymer (A1) obtained by using ethylene and α-olefin alone as monomers.

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 crosslinked product obtained by the method for producing a crosslinked product according to claim 1 .

7 . 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 6 , wherein the layer composed of one or more kinds of raw materials and the crosslinked product are laminated together.

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

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

10 . 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 0.06 or more and one or less;
(2) a ratio MFR 10 /MFR 2.16 is 8.5 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.).

11 . The ethylene copolymer (A) according to claim 10 , 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.

12 . The ethylene copolymer (A) according to claim wherein the ethylene copolymer (A) is an ethylene copolymer (A1) obtained by using ethylene and α-olefin alone as monomers.

13 . An ethylene copolymer composition comprising the ethylene copolymer (A) according to claim 10 and a crosslinking agent (C).

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

Assignees

• Mitsui Chemicals Inc

Inventors

• Nakano Hidetake
• Noda Kiminori
• Yasuda Kazuaki

Classifications

• B32B27/40

  comprising polyurethanes · CPC title

• C08J2201/03

  Extrusion of the foamable blend · CPC title

• A43B13/04

  Plastics, rubber or vulcanised fibre · CPC title

• B32B9/045

  of synthetic resin · CPC title

• C08F4/65912

  in combination with an organoaluminium compound · CPC title