Copolymer rubber composition, molded product, and automotive sealant
a technology of copolymer rubber and molded product, which is applied in the direction of vehicle components, vehicle maintenance, windows, etc., can solve the problems that the conventional solid members obtained by vulcanizing ethylene--olefin-nonconjugated diene copolymer rubbers are still not sufficiently satisfactory in compression set and strength, and achieves low compression set and high strength
Inactive Publication Date: 2010-09-02
SUMITOMO CHEM CO LTD
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- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0008]Under such a situation, an object of the present invention is to solve is to provide a copolymer rubber composition which can provide a crosslinked molded product having a low compression set and a high strength, a molded product obtained by crosslinking the copolymer rubber composition, and an automotive sealant having the molded product as a solid member.
[0014]The present invention can provide a copolymer rubber composition which can provide a crosslinked molded product having a low compression set and a high strength, a molded product obtained by crosslinking the copolymer rubber composition, and an automotive sealant having the molded product as a solid member.
Problems solved by technology
However, conventional solid members obtained by vulcanizing ethylene-α-olefin-nonconjugated diene copolymer rubbers are still not sufficiently satisfactory in compression set and strength.
Method used
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Experimental program
Comparison scheme
Effect test
example 1
The Preparation of a Copolymer Rubber Composition
[0084]Hexane, ethylene and propylene were fed at respective rates of 1.007 kg / (hr·L), 34.4 g / (hr·L) and 90.5 g / (hr·L) per unit time and per unit polymerization tank volume to a stainless steel first polymerization tank equipped with a stirrer. VOCl3 and ethanol were mixed and stirred at respective rates of 42.5 mg / (hr·L) and 20.4 mg / (hr·L) (VOCl3 / ethanol=1 / 1.8 (molar ratio)) in a line mixer, and thereafter, the mixture was fed to the polymerization tank. Further, ethylaluminum sesquichloride (EASC) and hydrogen were fed at respective rates of 242.5 mg / (hr·L) and 0.02 NL / (hr·L) to the polymerization tank. Further, 5-ethylidene-2-norbornene was fed at a rate of 4.0 g / (hr·L) to the polymerization tank. The temperature of the polymerization tank was held at 46° C. In the polymerization tank, a copolymer rubber was produced at a rate of 48 g / (hr·L) per unit time and per unit polymerization tank volume. The ethylene unit amount / the propylen...
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Abstract
The copolymer rubber composition comprises 60 to 75% by weight of a copolymer rubber (1) and 40 to 25% by weight of a copolymer rubber (2), and exhibits a difference in iodine value of 5 to 30 between the copolymer rubber (1) and the copolymer rubber (2). The copolymer rubber (1) is an ethylene-α-olefin-nonconjugated polyene copolymer rubber having an ethylene unit of 50 mol % to 70 mol %, an α-olefin unit of 50 mol % to 30 mol %, and an iodine value of 10 to 30, and the copolymer rubber (2) is an ethylene-α-olefinic copolymer rubber having an ethylene unit of more than 70 mol % and 95 mol % or less, an α-olefin unit of less than 30 mol % and 5 mol % or more, and an iodine value of 0 to 8.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a copolymer rubber composition, a molded product, and an automotive sealant.[0003]2. Related Background Art[0004]For automobiles, sealants sealing between car body opening peripheries, and opening / closing members for openings such as doors and trunk lids are used to prevent rain, wind and sounds from the outside. The sealants commonly include a solid member attached to door frames, trunk lids, car body opening peripheries and the like, and a sponge member to seal gaps between car body opening peripheries, and opening / closing members for openings.[0005]The solid member is required to have physical properties such as low compression set and high strength, and a non-foamed material or a slightly foamed material obtained by vulcanizing an ethylene-α-olefin copolymer rubber is generally used for the solid member.[0006]For example, Japanese Patent Application Laid-Open No. 2002-160327 proposes...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C08L9/00B60R13/06C08F218/18C08F297/00C08J9/00C08L23/16
CPCC08L2312/00C08L23/16C08L23/06C08K3/04C08K5/40C08K5/47C08L2666/06B60J1/20B60S1/38C08L2205/025C08L2205/03C08L91/00C08K13/02C08K2003/2296C08K5/09C08K2003/265
Inventor NAKANO, SADAYUKI
Owner SUMITOMO CHEM CO LTD