A cyclic olefin polymer, a cyclic olefin polymer monomer, and an optical product using the foregoing cyclic olefin polymer are provided.

##STR00001##

The cyclic olefin polymer includes a repeat unit shown in Formula (1) and/or a repeat unit shown in Formula (2). In Formula (1), 0≤p, and q≤6; x≥0, and y≥0; 0≤p.sub.1, q.sub.1≤6, and p.sub.1 and q.sub.1 are not 0 at the same time; R.sub.1 to R.sub.12, R.sub.a, R.sub.b, R.sub.c, R.sub.d, R.sub.13, R.sub.14, R.sub.15, and R.sub.16 are separately and independently selected from a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an alkoxy group, a hydroxy group, an ester group, a cyano group, an amino group, a thiol group, and an atom or an atomic group that can replace the foregoing group; and any two, three, or four of R.sub.13, R.sub.14, R.sub.15, and R.sub.16 may be connected to form a cyclic structure.

Disclosed is a hydrogenated norbornene ring-opened polymer, wherein a proportion of a norbornene-derived repeating unit is 90% by mass or more, a meso diad fraction of the norbornene-derived repeating unit is 80% or more, and in an X-ray diffraction pattern measured at 25° C. using a CuKα radiation source, an X-ray diffraction peak is observed which has a peak top positioned in a diffraction angle (2θ) range of 17° or more and 18° or less.

Macrocyclic polyalkene homopolymers and copolymers can be formed and converted to macrocyclic polyalkanes or macrocyclic poly(alkane-co-alkene) upon hydrogenation or, when the macrocyclic polyalkene is reacted with an alkene in the presence of an olefin metathesis catalyst, to a macrocyclic poly(alkane-co-alkene) comprising vicinal —C(═CR2)—'s. Upon hydrogenation of a macrocyclic poly(alkane-co-alkene) comprising vicinal —C(═CR2)-'s, macrocyclic poly(alkane)s or poly(alkane-co-alkene)s with isolated —C(═CR2)- groups can be provided, depending on the degree of hydrogenation. The poly(alkane-co-alkene)s with isolated —C(═CR2)- units can be used to form poly(macrocyclic poly(alkane-co-alkene))s, poly(macrocyclic poly(alkane))s, and/or bi-, tri-, and/or multi-macrocyclic poly(alkane-co-alkene)s or bi-, tri-, and/or multi-macrocyclic poly(alkane)s.

Provided is a hydrogenated product of a cyclic polymer including a cyclic chain that includes a repeating unit of a ring-opened cycloolefin.

Modified thermoplastic hydrocarbon thermoplastic resins are provided, as well as methods of their manufacture and uses thereof in rubber compositions. The modified thermoplastic resins are modified by decreasing the relative quantity of the dimer, trimer, tetramer, and pentamer oligomers as compared to the corresponding unmodified thermoplastic resin polymers, resulting in a product that exhibits a greater shift in the glass transition temperature of the elastomer(s) used in tire formulations. This translates to better viscoelastic predictors of tire tread performance, such as wet grip and rolling resistance. The modified thermoplastic resins impart remarkable properties on various rubber compositions, such as tires, belts, hoses, brakes, and the like. Automobile tires incorporating the modified thermoplastic resins are shown to possess excellent results in balancing the properties of rolling resistance, tire wear, snow performance, and wet braking performance.

A phase difference film formed of a resin containing a polymer having crystallizability, wherein: a coefficient of variation CV(Re) of an in-plane retardation of the phase difference film at a measurement wavelength of 590 nm is 1.0% or less.

1) Hydrocarbon-based copolymer comprising two end groups preceded by an ester function and chosen from a 2-oxo-1,3-dioxolan-4-yl (or cyclocarbonate), a dithiocyclocarbonate, an exo-vinylene cyclocarbonate and a 2-oxo-1,3-dioxolen-4-yl, the main chain of which comprises units (I) and (II) ##STR00001## in which R.sup.0 is notably a methyl radical; and the number-average molecular mass Mn of which is between 400 and 100 000 g/mol. 2) Process for preparing said copolymer, comprising: (i) a step of heating a statistical bipolymer A chosen from a poly(butadiene-isoprene), a poly(butadiene-myrcene) and a poly(butadiene-farnesene); and then (ii) a step of heating the product formed, in the presence of a chain-transfer agent. 3) Use as adhesive, as a mixture with an amine compound comprising at least two amine groups.

A layered film includes first, second, and third layers formed of first, second, and third resins, respectively, and provided in this order. The second resin contains an alkoxysilyl group-modified product of a hydrogenated product of a block copolymer; has 0.020% by weight or less of a moisture content as measured by the Karl-Fischer method after immersed in water at 37° C. for 24 hours and then allowed to stand at 23° C. and a humidity of 70% for 24 hours; and has a flexural modulus lower than flexural moduli of the first and third resins. One or both of the first and third resins contain a polymer containing an alicyclic structure. The first resin has a specific water vapor transmission rate. A ratio of a sum of thicknesses of the first and third layers relative to a thickness of the second layer is in a specific range.

1) Hydrocarbon-based copolymer comprising two end groups preceded by an ether function and chosen from a 2-oxo-1,3-dioxolan-4-yl (or cyclocarbonate), a dithiocyclocarbonate, and a 2-oxo-1,3-dioxolen-4-yl, the main chain of which comprises units (I) and (II) ##STR00001## in which R.sup.0 is notably a methyl radical; and the number-average molecular mass Mn of which is between 400 and 100 000 g/mol. 2) Process for preparing said copolymer, comprising: (i) a step of heating a statistical bipolymer A chosen from a poly(butadiene-isoprene), a poly(butadiene-myrcene) and a poly(butadiene-farnesene); and then (ii) a step of heating the product formed, in the presence of a chain-transfer agent. 3) Use as adhesive, as a mixture with an amine compound comprising at least two amine groups.

A cyclic olefin copolymer for a medical instrument has an aromatic ring and contains at least one structural unit (A) of the specific formulas (Ia), (II), and (III).