Abstract: A curable chlorinated polyethylene and copolyethylene composition comprising(A) 5 to 95% by weight, based on the total weight of (A) and (B), of a chlorinated polyethylene having a chlorine content of about 20 to about 50% by weight and derived from polyethylene having a melt index of 0.01 to 100,(B) 95 to 5% by weight, based on the total weight of (A) and (B), of a chlorinated copolymer of ethylene and a C.sub.2 -C.sub.5 alkyl acrylate or methacrylate, said copolymer having a chlorine content of about 2 to about 45% by weight and a melt index of 0.1 to 100,(C) 0 to 30 parts by weight, per 100 parts by weight of (A) and (B) combined, of an epichlorohydrin polymer or copolymer at least 40 mole % of which is derived from the epichlorohydrin, said polymer or copolymer having a specific reduced viscosity of 0.1 to 10 dl/g,(D) 0.1 to 5 parts by weight, per 100 parts by weight of (A), (B) and (C) combined, of a mercaptotriazine compound as a crosslinking agent,(E) 0.

Abstract: Chlorinated linear ultra low density polyethylene containing 3-40% by weight of chlorine produced by chlorinating a linear ultra low density polyethylene having the properties (i)-(iv) cited below, said polyethylene being produced by copolymerizing ethylene and an .alpha.-olefin having 3-12 carbon atoms in the presence of a catalyst comprising a solid catalyst component containing at least magnesium and titanium and an organic aluminum compound.______________________________________ (i) Melt index 0.01-100 g/10 min (ii) Density 0.860-0.910 g/cm.sup.3 (iii) Maximum peak temperature not lower than 100.degree. C.

Abstract: A chlorinated ethylene copolymer resin having a chlorine content of 5-50% by weight obtained by chlorinating an ethylene copolymer resin by the aqueous suspension method at a temperature of 100.degree. C. or higher in at least one chlorination stage, said copolymer resin being obtained by copolymerizing ethylene and as at least one comonomer 0.02-2.0 mol % of a nonconjugated diene using a polymerization catalyst comprising a solid catalytic component containing at least magnesium and titanium and an organic aluminum compound and having a maximum peak temperature according to the differential scanning calorimetry (DSC) of 100.degree. C. or higher.

Abstract: An after-chlorinated ethylene/butene-1 copolymer useful as a rubber material having especially good cold resistance characterized by having(a) 1 to 2 methyl groups per 100 carbon atoms,(b) a chlorine content of 25 to 35% by weight,(c) a weight average molecular weight of not less than 100,000,(d) a heat of fusion, determined by differential scanning calorimetry, of not more than 0.5 cal/g, and(e) an ethylene content of 93 to 97% by weight and a butene-1 content of 7 to 3% by weight.A process for its production is also provided.