GB488866A - The manufacture of stable synthetic rubber - Google Patents

Abstract

Synthetic rubber-like materials such as polymers of butadiene, isoprene, dimethyl butadiene, 2-chlorbutadiene, and joint polymers of these substances with other polymerizable substances, such as styrene and acrylic nitrile, are stabilized by adding sulphides or polysulphides of alkylated phenols such as may be prepared by reacting an alkylated phenol with sulphur chloride or monochloride or by melting the alkylated phenol with sulphur. The stabilizer may be added to the solid polymer on the roller or to the synthetic latex where emulsion polymerization is employed. Examples describe (1) and (2) the addition of di(tertiary amyl phenol) disulphide to a synthetic latex prepared by emulsion polymerization of butadiene with acrylic nitrile and styrene respectively; (4) the addition of cresol sulphide to a latex from butadiene and acrylic nitrile; (5) the addition of diisobutyl sulphide to a latex from 2-chlorbutadiene. Particulars are given of the properties of the various polymers: (1) without stabilizer, (2) with a sulphide of alkylated phenol as stabilizer, and (3) with phenyl - b - naphthylamine as stabilizer. The following compositions are mentioned: (1) 100 parts of the polymer of example 1, 40 parts carbon black, 10 parts of a tar residue sold under the Registered Trade Mark "Caoutchol," 5 parts zinc oxide, and 1 part each of sulphur and benzthiazyl - 2 - sulphene - diethyl - amide, vulcanization being effected for 40 minutes at 2,1 atmospheres pressure; and (2) 100 parts of the polymer of example 2, 10 parts zinc oxide, 10 parts titanium oxide, 1,5 parts each of sulphur and benzthiazyl - 2 - sulphene - diethylamide, and 2 parts stearic acid, vulcanization being effected for 60 minutes at 2,5 atmospheres pressure. The Provisional Specification refers to Specification 452,044, example 5, for the preparation of benzthiazyl-2-sulphene-diethylamide.ALSO:Synthetic rubber-like materials such as polymers of butadiene, isoprene, dimethyl butadiene, 2-chlor butadiene, and joint polymers of these substances with other polymerizable substances, such as styrene and acrylic nitrile, are stabilized by adding sulphides or polysulphides of alkylated phenols such as may be prepared by reacting an alkylated phenol with sulphur chloride or monochloride or by melting the alkylated phenol with sulphur. The stabilizer may be added to the solid polymer on the roller or to the synthetic latex where emulsion polymerization is employed. Examples described (1) and (2) the addition of di (tertiary and amyl phenol) disulphide to a synthetic latex prepared by emulsion polymerization of butadiene with acrylic nitrile and styrene respectively; (4) the addition of cresol sulphide to a latex from butadiene and acrylic nitrile; (5) the addition if diisobutyl sulphide to a latex from 2-chlorbutadiene. Particulars are given of the properties of the various polymers (1) without stabilizer, (2) with a sulphide of alkylated phenol as stabilizer, and (3) with phenyl-b -naphthylamine as stabilizer. The following compositions are mentioned, (1) 100 parts of the polymer of example 1, 40 parts carbon black, 10 parts a tar residue sold under the Registered Trade Mark "Caoutchol," 5 parts zinc oxide, and 1 part each of sulphur and benzthiazyl-2-sulphene-diethyl-amide, vulcanization being effected for 40 minutes at 2,1 atmospheres pressure; and (2) 100 parts of the polymer of example 2, 10 parts zinc oxide, 10 parts titanium oxide, 1,5 parts each of sulphur and benzthiazyl-2-sulphene-diethylamide, and 2 parts stearic acid, vulcanization being effected for 60 minutes at 2,5 atmospheres pressure. The Provisional Specification refers to Specification 452,044, [Group IV], example 5 for the preparation of benzthiazyl-2-sulphene-diethylamide.