US 6,635,727 B1 · Ethylene copolymer rubber, process for producing the same, and use

Abstract

The ethylenic copolymer rubber according to the present invention is a novel and useful ethylenic copolymer rubber which can be cross-linked at a high velocity and is superior in scorching stability, in workability and in moldability, of which cross-linked product is superior in the mechanical properties, such as the cross-linked rubber strength etc., and in the form-preservability. A cross-linkable rubber composition containing this ethylenic copolymer rubber is utilized for producing, for example, cross-linked molded rubber product for use as sealing element and automobile weather strip sponge. The ethylenic copolymer rubber according to the present invention comprises a random copolymer made of ethylene, an α-olefin having 3-20 carbon atoms and a triene represented by the formula (1) given below as well as an optionally incorporated non-conjuagted polyene having two or more polymerizable double bonds in the molecule, wherein the mole ratio of ethylene/α-olefin is 95/5-40/60 and the triene content is 0.1-10 mole %, the intrinsic viscosity (η) determined in decalin at 135° C. is 0.1-10 dl/g and wherein the ratio of the above intrinsic viscosity (η) versus the converted intrinsic viscosity (η)blank′ converted to a linear ethylene/propylene copolymer having 70 mole % of ethylene units determined by gel permeation chromatography (GPC, at 140° C., in o-dichlorobenzene solvent) of the ethylenic copolymer rubber, i.e. (η)/(η)blank′=g′, is 0.5-0.95. in which R1 and R2 denote each, independently of each other, hydrogen atom, methyl or ethyl and R3 and R4 denote each, independently of each other, methyl or ethyl.

Claims42

Dependent claims

An ethylenic copolymer rubber comprising a random copolymer comprising structural units derived from comonomers, respectively, of

(a) ethylene,
(b) one or more α-olefins having 3-20 carbon atoms,
(c) one or more trienes represented by the formula (1),
in which R1 and R2 denote each, independently of each other, hydrogen atom, methyl or ethyl and R3 and R4 denote each, independently of each other, methyl or ethyl, and
(d) one or more non-conjugated polyenes having in the molecule at least two polymerizable double bonds, wherein the copolymer rubber has characteristic features
that the mole ratio of the structural unit derived from ethylene (a) versus the structural unit derived from the α-olefin(s) having 3-20 carbon atoms (b), i.e. ethylene/α-olefin(s), is in the range from 95/5 to 40/60,
that the content of the structural unit derived from the triene(s) (c) is in the range from 0.1 to 10 mole %,
that the content of the structural unit derived from the non-conjugated polyene(s) (d) is in the range from 0.02 to 3 mole % and
that the intrinsic viscosity (η) determined in decalin at 135° C. is in the range from 0.1 to 10 dl/g.

6 more elements

An ethylenic copolymer rubber comprising structural units derived from comonomers, respectively, of

(a) ethylene,
(b) one or more α-olefins having 3-20 carbon atoms,
(c) one or more trienes represented by the formula (1)
in which R1 and R2 denote each, independently of each other, hydrogen atom, methyl or ethyl and R3 and R4 denote each, independently of each other, methyl or ethyl and
(d) one or more non-conjugated polyenes having at least two polymerizable double bonds in the molecule, wherein the copolymer rubber has characteristic features
that the mole ratio of the structural unit derived from ethylene (a) versus the structural unit derived from the α-olefin(s) having 3-20 carbon atoms(b), i.e. ethylene/α-olefin(s), is in the range from 95/5 to 40/60,
that the content of the structural unit derived from the triene(s) (c) is in the range from 0.1 to 10 mole %,
that the content of the structural unit derived from the non-conjugated polyene(s) (d) is in the range of from 0.2 to 3 mole %,
that the intrinsic viscosity (η) determined in decalin at 135° C. is in the range from 0.1 to 10 dl/g and
that the ratio of the above intrinsic viscosity (η) versus the converted intrinsic viscosity (η)blank converted to a linear ethylene/propylene copolymer having 70 mole % of ethylene determined by gel permeation chromatography (GPC:
determined at 140° C., in a solvent of o-dichlorobenzene) of the ethylenic copolymer rubber, i.e. (η)/(η)blank′=g′, is 0.5-0.95.

8 more elements

An ethylenic copolymer rubber comprising structural units derived from comonomers, respectively, of

(a) ethylene,
(b) one or more α-olefins having 3-20 carbon atoms,
(c) one or more trienes represented by the formula (1)
in which R1 and R2 denote each, independently of each other, hydrogen atom, methyl or ethyl and R3 and R4 denote each, independently of each other, methyl or ethyl, and
(d) one or more non-conjugated polyenes having at least two polymerizable double bonds in the molecule, wherein the copolymer rubber has characteristic features
that the mole ratio of the structural unit derived from ethylene (a) versus the structural unit derived from the α-olefin(s) having 3-20 carbon atoms (b), i.e. ethylene/α-olefin(s), is in the range from 95/5 to 40/60,
that the content of the structural unit derived from the triene(s) (c) is in the range from 0.1 to 10 mole %,
that the content of the structural unit derived from the non-conjugated polyene(s) (d) is in the range from 0.2 to 3 mole %,
that the intrinsic viscosity (η) determined in decalin at 135° C. is in the range from 0.1 to 10 dl/g and
that the complex viscosity coefficient (η*A) at 8 rad/sec in the assessment of dependence of the complex viscosity coefficient (η*) on the frequency estimated from the kinematic viscoelasticity at 190° C. is at least 2×103 Pa.S and the ratio of the complex viscosity coefficient (η*B) at 0.01 rad/sec versus the complex viscosity coefficient (η*A) namely, (η*B)/(η*A) is at least 35.

7 more elements

Dependencies are inferred from the claim text.

Ethylene copolymer rubber, process for producing the same, and use

Life of this patent

Ethylene copolymer rubber, process for producing the same, and use

Life of this patent

Abstract

Claims42