[1] A -phellandrene polymer which is a polymerization product of -phellandrene. [2] The -phellandrene polymer comprising -phellandrene units represented by chemical formulae (I-1), (I-2), (II-1) and (II-2), a total amount of the -phellandrene units being 50% by mass or more. [3] The -phellandrene polymer, which has a number average molecular weight Mn of 40,000 or more. [4] The -phellandrene polymer, wherein at least a part of olefinic carbon-carbon double bonds thereof are hydrogenated. [5] The -phellandrene polymer, which has a glass transition temperature of 80 C. or more. ##STR00001##

A polymer comprising recurring units derived from organic unsaturated planar ring monomers. The recurring units are stacked, linked to one another by linkers, and are capable of undergoing oxidation and/or reduction, and the polymer is electrically conducting.

A polymer comprising recurring units derived from organic unsaturated planar ring monomers. The recurring units are stacked, linked to one another by linkers, and are capable of undergoing oxidation and/or reduction, and the polymer is electrically conducting.

A method for the combined synthesis of a mono-unsaturated nitrile-ester(acid) and of a bi-functional carbonyl compound, wherein it includes a step including the cross metathesis mc1 of an unsaturated fatty acid/ester compound with an unsaturated nitrile compound, in which mc1 is performed with partial conversion such as to obtain and recover, separately, at least the following products: a mono-unsaturated nitrile-ester/acid and a symmetrical compound, diester or diacid respectively including a double bond located in the middle of the molecular chain of compound, and subsequently a step including the oxidation cleavage cp2 of the double bond of compound, such as to form a single type of carbonyl compound having formula R2-(CH2)n-COR, in which R is H or OH, depending on the operating conditions selected for the oxidation cleavage cp2. Also, the production of monomers for the polymer industry.

A method of preparing a branched polymer comprises the free radical polymerisation of a multivinyl monomer in the presence of a chain transfer agent, using a source of radicals, wherein the extent of propagation is controlled relative to the extent of chain transfer to prevent gelation of the polymer. The average length of each vinyl polymer chain within the product is short.