Rubber composition for weather strip glass run channel

Patent metadata

Field	Value
Publication number	US-2016160018-A1
Application number	US-201514872111-A
Country	US
Kind code	A1
Filing date	Sep 30, 2015
Priority date	Dec 5, 2014
Publication date	Jun 9, 2016
Grant date	—

Abstract

A rubber composition used for a weather strip glass run channel of a vehicle includes a base polymer, a reinforcing agent, a moisture absorbent, a vulcanizing and curing agent, a vulcanization accelerator, and a vulcanization activator. The base polymer contains an ethylene propylene diene (EPDM) terpolymer in 80 to 90% by weight based on a weight of the base polymer and a silicone-acrylic ester graft copolymer in 10 to 20% by weight based on the weight of the base polymer.

First claim

What is claimed is:

1 . A rubber composition for a weather strip glass run channel, the rubber composition comprising:
a base polymer; a reinforcing agent; a moisture absorbent; a vulcanizing and curing agent; a vulcanization accelerator; and a vulcanization activator, wherein the base polymer contains an ethylene propylene diene (EPDM) terpolymer in 80 to 90% by weight based on a weight of the base polymer and a silicone-acrylic ester graft copolymer in 10 to 20% by weight based on the weight of the base polymer.

2 . The rubber composition of claim 1 , wherein the EPDM terpolymer has an ethylene content of 70% by weight or greater and a Mooney viscosity (ML 1+8 , 125° C.) of 70 or greater.

3 . The rubber composition of claim 1 , wherein the silicone-acrylic ester graft copolymer has a silicone content of 70% by weight or greater and is a spherical particle having an average particle size of 15 to 45 μm.

4 . The rubber composition of claim 1 , wherein the reinforcing agent is fast extruding furnace carbon black having an average diameter range of 40 to 48 nm.

5 . The rubber composition of claim 1 , wherein the moisture absorbent is calcium oxide (CaO).

6 . The rubber composition of claim 1 , wherein the vulcanization accelerator is at least one selected from the group consisting of zinc dibutyl dithiocarbamate (ZnBDC), 2-mercaptobenzothiazole (MBT), ethylene thiuram (ETU), 4,4′-dithiodimorpholine (DTDM), mercaptobenzothiazole disulfide (MBTS), and tetramethyl thiuram disulfate (TMTD).

7 . The rubber composition of claim 1 , wherein the vulcanization activator is at least one selected from the group consisting of zinc oxide (ZnO), stearic acid, and a mixture thereof.

8 . The rubber composition of claim 1 , further comprising at least one additive selected from the group consisting of aromatic naphthenic-based oil, aliphatic paraffin-based oil, and paraffin-based/ naphthenic-based oil.

9 . A method for manufacturing a rubber composition for a weather strip glass run channel, the method comprising steps of:
a) preparing carbon master batch (CMB) rubber by mixing an EPDM terpolymer, a reinforcing agent, and a moisture absorbent, and aging the mixture for 20 to 30 hours; b) adding and mixing a silicone-acrylic ester graft copolymer to the CMB composition, and aging the mixture for 20 to 30 hours; and c) preparing a final master batch (FMB) composition by adding and mixing a vulcanizing and curing agent, a vulcanization accelerator, and a vulcanization activator to the composition aged in the b) step.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Park Joon Chul

Classifications

• C08J3/226

  using a polymer as a carrier · CPC title

• C08J2483/10

  Block- or graft-copolymers containing polysiloxane sequences · CPC title

• C08L23/16 Primary

  Ethylene-propylene or ethylene-propylene-diene copolymers · CPC title

• C08J2323/16

  Ethene-propene or ethene-propene-diene copolymers · CPC title

• C08K3/26

  Carbonates; Bicarbonates · CPC title