Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2001-03-26
2004-09-07
Teskin, Fred (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S281000, C526S283000, C526S336000, C526S282000, C525S211000, C525S216000, C152S209100, C152S450000
Reexamination Certificate
active
06787623
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a novel and useful copolymer based on non non-conjuated cyclic polyene, to a rubber composition containing such copolymer and a rubber based on diene and to uses of them.
DESCRIPTION OF THE RELATED TECHNIQUES
There has heretofore been employed in general a rubber composition composed of a styrene/butadiene copolymer rubber (SBR) and natural rubber for a rubber material for the tread of tires of automobile. However, it has been desired for a tire to have, in addition to high abrasion resistance and lower driving fuel cost concomitant with the recent trend of facilitation of energy economization, a high braking performance in respect of the traffic safety. Thus, there is a problem that conventionally employed product of a blend of styrene/butadiene copolymer rubber and natural rubber does not meet the above requirement.
As a rubber composition which can increase the braking performance and abrasion resistance of tires and can decrease the rolling resistance thereof, a raw rubber blend for tire tread composed of a polybutadiene rubber and a halogen-containing polyisobutylene/isoprene rubber is described in Japanese Patent Kokai Sho 56-93738 A. However, also by this rubber blend, the abrasion resistance, the braking performance and the effects of reduction in the rolling resistance are not sufficient.
An object of the present invention is to provide a novel and useful copolymer based on non-conjugated cyclic polyene capable of serving favorably as a constituent of rubber material for tires.
Another object of the present invention is to provide a rubber composition containing the above copolymer based on non-conjugated cyclic polyene capable of producing tires exhibiting a superior braking performance and a superior driving fuel cost aspect in a compatible manner.
A further object of the present invention is to provide a rubber material for tires containing the above copolymer based on non-conjugated cyclic polyene or the above rubber composition and exhibiting superior properties required for a tire, especially a superior braking performance and a superior driving fuel cost aspect in a compatible manner.
A still further object of the present invention is to provide a tire tread produced from the above rubber material for tires and to provide a tire having such a tire tread.
DISCLOSURE OF THE INVENTION
The present invention consists in the random copolymer based on non-conjugated cyclic polyene, in the rubber composition and in the use thereof as given in the following:
(1) A random copolymer based on non-conjugated cyclic polyene comprising structural units originated from one or more &agr;-olefins (A1) and originated from one or more non-conjugated cyclic polyenes (A2), the said random copolymer having characteristic features comprising
a content of the structural unit(s) originated from the said one or more &agr;-olefins (A1) in the range of 93 to 70 mole %,
a content of the structural unit originated from the said one or more non-conjugated cyclic polyenes (A2) in the range of 7 to 30 mole %,
an intrinsic viscosity [&eegr;], determined in Decalin at 135° C., in the range of 0.01 to 20 dl/g,
a glass transition temperature (Tg) of not higher than 40° C. and
an iodine value in the range of 50 to 150.
(2) A random copolymer based on non-conjugated cyclic polyene comprising structural units originated from one or more &agr;-olefins (A1), originated from one or more non-conjugated cyclic polyenes (A2) and originated from one or more non-conjugated linear polyenes (A3), the said random copolymer having characteristic features comprising
a content of the structural unit(s) originated from the said one or more &agr;-olefins (A1) in the range of 97.9 to 55 mole %,
a content of the structural unit originated from the said one or more non-conjugated cyclic polyenes (A2) in the range of 2 to 30 mole %,
a content of the structural unit originated from the said one or more non-conjugated linear polyenes (A3) in the range of 0.1 to 15 mole %,
an intrinsic viscosity [&eegr;], determined in Decalin at 135° C., in the range of 0.01 to 20 dl/g,
a glass transition temperature (Tg) of not higher than 40° C. and
an iodine value in the range of 5 to 150.
(3) The random copolymer as defined in the above (1) or (2), wherein the structural unit(s) originated from one or more &agr;-olefins (A1) comprise at least a structural unit originated from ethylene in which the mole ratio of (the structural unit originated from ethylene) versus (the structural unit(s) originated from other &agr;-olefin(s) having 3 or more carbon atoms) is in the range from 100/0 to 1/99.
(4) The random copolymer as defined in the above (1) or (2), wherein the structural unit(s) originated from one or more &agr;-olefins (A1) comprise at least a structural unit originated from ethylene in which the mole ratio of (the structural unit originated from ethylene) versus (the structural unit(s) originated from other &agr;-olefin(s) having 3 or more carbon atoms) is in the range of 100/0 to 50/50.
(5) The random copolymer as defined in any one of the above (1) to (4), wherein the non-conjugated cyclic polyene (A2) is that represented by the formula (1-1) given below:
in which m is an integer of 0 to 2, R
1
to R
4
denote each, independently of each other, an atom or a residue selected from the group consisting of hydrogen atom, halogen atoms and hydrocarbon residues which may have double bond, wherein R
1
to R
4
may be fused together to form a mono- or polycyclic ring which may have double bond or wherein an alkylidene radical may be formed from the pair of R
1
and R
2
or R
3
and R
4
or, further, R
1
and R
3
or R
2
and R
4
may be fused together so as to form a double bond, with the proviso that at least one of R
1
to R
4
stands for an unsaturated hydrocarbon residue having at least one double bond, in case the mono- or polycyclic ring formed from R
1
to R
4
by being fused together has no double bond, in case the pair of R
1
and R
2
or R
3
and R
4
does not form an alkylidene radical and in case R
1
and R
3
or R
2
and R
4
are not fused together to form an endocyclic double bond.
(6) The random copolymer as defined in any one of the above (2) to (5), wherein the non-conjugated linear polyene (A3) is represented by the formula (2-1) given below:
in which p and q is zero or 1 with the proviso that p and q are not zero simultaneously, f is an integer of zero to 5 with the proviso that f is not zero when both p and q are 1, g is an integer of 1 to 6, R
1
, R
2
, R
3
, R
4
, R
5
, R
6
and R
7
denote each, independently of each other, hydrogen atom or an alkyl group having 1-3 carbon atoms, R
8
denoted an alkyl group having 1-3 carbon atoms and R
9
denotes hydrogen atom, an alkyl group having 1-3 carbon atoms or a group represented by —(CH
2
)n-CR
10
═C(R
11
)R
12
in which n is an integer of 1 to 5, R
10
and R
11
represent each, independently of each other, hydrogen atom or an alkyl group having 1-3 carbon atoms and R
12
represents an alkyl group having 1-3 carbon atoms, with the proviso that R
9
is hydrogen atom or an alkyl group having 1-3 carbon atoms when both p and q are 1.
(7) A rubber composition comprising
(A) a random copolymer based on non-conjugated cyclic polyene comprising structural units originated from one or more &agr;-olefins (A1) and originated from one or more non-conjugated cyclic polyenes (A2), the said random copolymer having characteristic features comprising a content of the structural unit(s) originated from the said one or more &agr;-olefins (A1) in the range of 93 to 70 mole %; a content of the structural unit originated from the said one or more non-conjugated cyclic polyenes (A2) in the range of 7 to 30 mole %; an intrinsic viscosity [&eegr;], determined in Decalin at 135° C., in the range of 0.01 to 20 dl/g; a glass transition temperature (Tg) of not higher than 40° C.; and an iodine value in the range of 50 to 150, and
(B) a rubber based on diene,
wherein the weight proportion of (th
Ichino Kotaro
Kawasaki Masaaki
Murakami Hidetatsu
Okada Keiji
Burns Doane Swecker & Mathis L.L.P.
Mitsui Chemicals Inc.
Teskin Fred
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