Bridgestone Tire Company Limited

Eiichi Kobayashi

Junji Furukawa

Takahiro Kawagoe

Kazuo Haga

A novel coating composition can be obtained by compounding 100 parts by weight of (A) acetylene-conjugated random copolymer having an acetylene unit content of 5-60 mol% and a block character P of 0.8-1.2 and 5-1,000 parts by weight of (B) carbon-carbon double bond-containing compound. The resulting coating composition shows a rapid curing velocity, which has never been seen, and provides an excellent coating film. When the above described composition is added with (C) a curing promoter or a radical initiator, the curing velocity is more increased and when the above described composition is added with (D) a filler or a pigment, excellent coating films suitable for various applications can be formed.

Novel coating composition containing acetylene-conjugated diene random

An epoxidized acetylene-conjugated diene random copolymer, of which epoxy equivalent is within the range of from 50 to 1,000, is obtained by epoxidizing an acetylene-conjugated diene random copolymer, in which acetylene and conjugated diene are bonded linearly and randomly, the block character P is within the range of from 0.8 to 1.2 and the acetylene content is less than 60 mol%, with an organic peracid. The epoxidized acetylene-conjugated diene random copolymer is more reactive than the crude random copolymer and yields an excellent film, a coating material or a shaped article. Further by adding some of curing agents to the epoxidized acetylene-conjugated diene random copolymer, the cure rate of the epoxidized copolymer is fairly enhanced.

Epoxidized acetylene-conjugated diene random copolymer and the curable

A method for manufacturing a high molecular weight, elastic and random type butadiene-propylene copolymer whose propylene content is in the range of 3 to 45 mol%, which comprises copolymerizing butadiene and propylene in the molar ratio ranging from 1/10 to 10/1 at a temperature in the range of 0.degree. to 80.degree.C in the presence of a catalyst system consisting of (1) at least one compound selected from the group consisting of titanium tetrachloride, titanium tetrabromide and vanadyl trichloride, (2) an organoaluminum compound having the general formula, ALR.sup.1 R.sup.2 R.sup.3 wherein R.sup.1, R.sup.2 and R.sup.3 represent a hydrocarbon radical and (3) phosgene, in which said components (2) and (3) are mixed at room temperature prior to the addition of other catalyst components and of monomers. The resulting random butadiene-propylene copolymer is highly elastic and superior to cis-1,4-polybutadiene in resistance to thermal aging.

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Uji, Japan

Eiichi Kobayashi