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Disclosed is a resin composition comprising (.alpha.) at least one polymer selected from the group consisting of a non-modified cyclic monomer unit-containing polymer and a modified cyclic monomer unit-containing polymer having a number average molecular weight of from 10,000 to 5,000,000, wherein t

Disclosed is a resin composition comprising (.alpha.) at least one polymer selected from the group consisting of a non-modified cyclic monomer unit-containing polymer and a modified cyclic monomer unit-containing polymer having a number average molecular weight of from 10,000 to 5,000,000, wherein the cyclic monomer unit is derived from a cyclic conjugated diene, and (.beta.) at least one polymer other than the polymer (.alpha.), and wherein the polymer (.alpha.) is present in an amount of at least 1% by weight, based on the total weight of the polymers (.alpha.) and (.beta.). The molecular structure of the polymer (.alpha.) which is contained in the novel resin composition of the present invention and which is selected from a non-modified cyclic monomer unit-containing polymer and a modified cyclic monomer unit-containing polymer, wherein the cyclic monomer unit is derived from a cyclic conjugated diene, can be controlled with large freedom. Therefore by combining the polymer (.alpha.) with a polymer (.beta.) other than the polymer (.alpha.), a resin composition which is excellent in various properties, such as theremal stability with respect to rigidity, and impact resistance can be provided with large freedom with respect to the choice of its properties.

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[ We claim:] [1.] A resin composition comprising:(.alpha.) at least one polymer selected from the group consisting of a non-modified cyclic monomer unit-containing polymer (1) and a modified cyclic monomer unit-containing polymer (1'), said polymer (1) and said polymer (1') being, respectively, repr

[ We claim:] [1.] A resin composition comprising:(.alpha.) at least one polymer selected from the group consisting of a non-modified cyclic monomer unit-containing polymer (1) and a modified cyclic monomer unit-containing polymer (1'), said polymer (1) and said polymer (1') being, respectively, represented by the following formulae (1) and (1'): [ STR 13 ] wherein A to F are monomer units constituting a main chain of each of said polymers (1) and (1'), in which monomer units A to F are arranged in any order, and a to f are, respectively, weight percentages of monomer units A to F, based on the total weight of monomer units A to F;wherein:A is selected from the group consisting of cyclic olefin monomer units each being independently represented by the following formula (4): [ STR 14 ] wherein each R.sup.2 independently represents a hydrogen atom, a halogen atom, a C.sub.1 -C.sub.20 alkyl group, a C.sub.2 -C.sub.20 unsaturated aliphatic hydrocarbon group, a C.sub.5 -C.sub.20 aryl group, a C.sub.3 -C.sub.20 cycloalkyl group, a C.sub.4 -C.sub.20 cyclodienyl group or a 5 to 10-membered heterocyclic group having at least one nitrogen, oxygen or sulfur atom as a heteroatom, B is selected from the group consisting of cyclic conjugated diene monomer units each being independently represented by the following formula (5): [ STR 15 ] wherein each R.sup.2 is as defined for formula (4), each C is independently selected from the group consisting of chain conjugated diene monomer units,each D is independently selected from the group consisting of vinyl aromatic monomer units,each E is independently selected from the group consisting of polar monomer units, andeach F is independently selected from the group consisting of an ethylene monomer unit and .alpha.-olefin monomer units;wherein: a to f satisfy the following requirements:a+b+c+d+e+f=100,.ltoreq. a, b.ltoreq.100,0.ltoreq.c, d, e, f0 and b>0 or when 0