Abstract: (Meth)acrylic polymers having alkenyl or curable silyl groups at the chain ends high functionality ratios are prepared by a process which comprises (i) preparing a (meth)acrylic polymer having halogen atoms at the chain ends, using an organohalogenated compound or a halosulfonyl compound as an initiator and a metal complex catalyst wherein the central metal atom is selected from the group consisting of the elements of Groups 8, 9, 10 and 11 of the periodic table; and (ii) transforming the halogen atom into an alkenyl group- or a curable silyl group-containing substituent. The obtained (meth)acrylic polymers form homogeneous curing materials.

Abstract: A method for producing a hydroxyl-terminated (meth) acrylic polymer which comprises converting a halogen atom in a terminal structure of the general formula (1)--CH.sub.2 --C(R.sup.1)(CO.sub.2 R.sup.2)(X) (1)wherein R.sup.1 is hydrogen or methyl, R.sup.2 is alkyl containing 1 to 20 carbon atoms, aryl containing 6 to 20 carbon atoms or aralkyl containing 7 to 20 carbon atoms, and X is chlorine, bromine or iodine, of a (meth)acrylic polymer obtained by polymerizing a (meth)acrylic monomer using an organic halide or a halogenated sulfonyl compound as an initiator and, as a catalyst, a metal complex with a central metal selected from the elements belonging to the groups 8, 9, 10 and 11 in the periodic table, into a hydroxyl-containing substituent.The present invention can provide, in an easy and simple manner, a (meth)acrylic polymer which is hydroxyl-terminated at both ends in a high proportion and which has been difficult to produce in the prior art. It can give a cured product with good curing characteristics.

Abstract: This invention provides a hydrosilylation method in which hydrosilyl groups are added to olefin using a metal catalyst, which comprises controlling the hydrosilylation reaction by allowing a compound selected from thiazoles and phosphines to coexist in the reaction system, and a process making use thereof for the production of a hydrosilyl group-containing organic curing agent. This invention gives a method for easy control of hydrosilylation reaction and a process making use thereof for the production of an organic compound modifying silicon compound having 2 or more hydrosilyl groups in the molecule. This compound is used as a curing agent of addition type curable compositions. As an accompanying effect, storage stability of the produced curing agent is improved when a catalyst and additives of this invention remain therein, in comparison with the case in which only the catalyst remains.

Abstract: The present invention provides a powder coating having an excellent curability which can be baked without evaporation of a blocking agent as compared with the conventional powder coating to provide a coat having an excellent yellowing resistance an improved smoothness and weather resistance. A novel powder coating containing, as a main component, a polyester resin composition is provided, comprising (A) an alkenyl group-containing polyester resin with a number-average molecular weight of from 500 to 100,000 having at least 1.2 alkenyl groups on the average per molecule, (B) a Si--H group-containing curing agent having at least two Si--H groups per molecule, and (C) a catalyst active in hydrosilylation.