Olefin resin, crosslinked product thereof, and production methods thereof
The present invention relates to an olefin resin including a copolymer of an olefin macromonomer with a non-conjugated diene.
1. An olefin resin comprising a copolymer of an olefin macromonomer with a non-conjugated diene,
wherein the non-conjugated diene is selected from chain dienes, cyclic dienes, and a polyolefin polymer containing vinyl groups at both chain ends which contains constituent units derived from at least one selected from the group consisting of ethylene (a), α-olefins having 3 to 20 carbon atoms (b), and cyclic olefins (c) represented by formulas [I], [II], and [III] below, wherein
1) the vinyl termination ratio to both chain ends of all molecular chains is 70% or more, and
2) the intrinsic viscosity [η] measured in a decalin solution at 135° C. is in a range of 0.01 to 10 dl/g,
wherein u is 0 or 1, v is 0 or an integer of 1 or more, w is 0 or 1, R 61 to R 78 , R a1 , and R b1 may be the same or different from each other and are each a hydrogen atom, a halogen atom, or a hydrocarbon group, R 75 to R 78 may be bonded to each other to form a monocyclic or polycyclic ring, the monocyclic or polycyclic ring may have a double bond, and R 75 and R 76 , or R 77 and R 78 may form an alkylidene group,
wherein x and d are each 0 or an integer of 1 or more, y and z are each 0, 1, or 2, R 81 to R 99 may be the same or different from each other and are each a hydrogen atom, a halogen atom, an aliphatic hydrocarbon group, an aromatic hydrocarbon group, or an alkoxy group, the carbon atom to which R 89 and R 90 are bonded and the carbon atom to which R 93 is bonded or the carbon atom to which R 91 is bonded may be bonded directly or via an alkylene group having 1 to 3 carbon atoms, and R 95 and R 92 , or R 95 and R 99 may be bonded to each other to form a monocyclic or polycyclic aromatic ring when y=z=0 is satisfied,
wherein R 100 and R 101 may be the same or different from each other and are each a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, and f is an integer of 1≤f≤18, and
wherein the copolymer is free from comonomers other than the olefin macromonomer and the non-conjugated diene.
2. The olefin resin according to claim 1 , wherein the copolymer of the olefin macromonomer with the non-conjugated diene has a content of structural units derived from the olefin macromonomer in a range of 80 to 99.5 mol %.
3. The olefin resin according to claim 1 , wherein the olefin macromonomer satisfies requirements (i) to (iii) below:
(i) the olefin macromonomer is a homopolymer or a copolymer of one or more olefins selected from ethylene and a-olefins having 3 to 12 carbon atoms;
(ii) the olefin macromonomer has a weight-average molecular weight in a range of 1,000 to 30,000; and
(iii) the olefin macromonomer has vinyl groups in an amount of 50 mol % or more with respect to all unsaturated end-groups.
4. The olefin resin according to claim 3 , wherein the requirement (i) is that the olefin macromonomer is a copolymer of ethylene with one or more α-olefins having 3 to 12 carbon atoms, wherein a content of repeating units derived from ethylene is in a range of 30 to 70 mol %.
5. The olefin resin according to claim 3 , wherein the requirement (iii) is that the olefin macromonomer has vinyl groups in an amount of 60 mol % or more with respect to the all unsaturated end-groups.
6. A method for producing the olefin resin according to claim 1 , comprising step A and step B below:
step A: a step of producing an olefin macromonomer by polymerizing an olefin in the presence of an olefin polymerization catalyst; and
step B: a step of producing an olefin resin by copolymerizing the olefin macromonomer produced in the step A with a non-conjugated diene in the presence of an olefin polymerization catalyst.
7. A crosslinked product of the olefin resin according to claim 1 .
8. A method for producing a crosslinked product, comprising crosslinking an olefin resin obtained by the method according to claim 6 using a crosslinking agent.