Antiozonant stabilization of copolymer elastomers

Claim 2

AN ELASTOMER COPOLYMER VULCANIZATE SELECTED FROM THE CLASS CONSISTING OF THE BUTADIENE-STYRENE-, THE BUTADIMETHYLVINYLKETONE-, THE BUTADIENE - STYRENE-ISOPROPENYLENE-STYRENE-METHACRYLIC ACID-, THE BUTADIENE-STYRENEKETONE-, THE BUDADIENE-STYRENE-CROTONALDEHYDE, THE ISOPRENE-ISOBUTYLENE-, THE BUTADIENE-ACRYLONITRILE-, AND THE BUTADIENEMETHYL VINYL PYRIDENE-COPOLYMERS, SAID VULCANIZATE BEING INHIBITED AGAINST CRACKING FROM OZONE ATTACK BY THE INCORPORATION THEREIN, PRIOR TO VULCANIZATION, OF AN ANTIOZONANT COMPOSITION ESSENTIALLY COMPRISING NISOPROPYL-N''-PHENYL - P - PHENYLENEDIAMINE, IN SUFFICIENT AMOUNT TO RETARD SUCH CRACKING.

Claim 3

A VULCANIZATE ACCORDING TO CLAIM 1 IN WHICH SAID ANTIOZONANT COMPOSITION CONSISTS ESSENTIALLY OF SAID NISOPROPYL-N''-PHENYL-P-PHENYLENEDIAMINE COMBINED WITH SYNERGISTIC MATERIAL SELECTED FROM THE CLASS CONSISTING OF THE PETROLEUM WAXES AND ANTIOXIDANTS AND COMBINATIONS THEREOF; THE PETROLEUM WAXES OF SAID CLASS BEING OF THE GROUP CONSISTING OF THE PARAFFIN AND MICROCRYSTALLINE WAXES AND COMBINATIONS THEREOF, AND THE ANTIOXIDANTS OF SAID CLASS BEING OF THE GROUP CONSISTING OF 7-ETHOXY-2,2, 4 - TRIMETHYL-1,2-DIHYDROQUINOLINE; 2,2,4-TRIMETHYL-1,2-DIHYDROQUINOLINE POLYMER; DIPHENYLAMINEACETONE CONDENSATION PRODUCTS; PHENYL-BETA-NAPHTHYLAMINE; PHENYLALPHA-NAPHTHYLAMINE; ANILINE-ACETONNE CONDENSATION PRODUCTS; ANILINE-BUTYRALDEHYDE CONDENSATION PRODUCTS; DIALPHA-NAPHTHYLAMINE; DI-BETA-NAPHTHYLAMINE; PHENYLENEDIAMINE, O-, M-, AND P- FORMS; P,P''-DIAMINODIPHENYLMETHANE; P-AMINODIPHENYLAMINE; 1,2-DIANILINOETHANE; O-TOLIDINE; N,N''-DIPHENYL-P-PHENYLENEDIAMINE; NAPHTHALENEDIPHENYLENEDIAMINE; N,N''-DI-BETA-NAPHTHYL-P-PHENYLENEDIAMINE, N,N''-DI-BETA-AC-TETRAHYDRONAPHTHYL-P-PHENYLENEDIAMINE; N,N''-DI-ALPHA-NAPHTHYL-P-PHENYLENEDIAMINE; TETRAETHYLENEPEENTAMINOPROPIONITRILE; MIXTURE OF ISOPROPOXYDIPHENYLAMINE, DIPHENYLPHENYLENEDIAMINE AND PHENYL-BETANAPHTHYLAMINE; DEHYDROABIETHYLAMINE; DODECYLAMINE-1; N,N'' - TETRAMETHYL-P,P''-DI(AMINOPHENYL)-METHANE; N,N''DIMETHYL-P-PHENYLENEDIAMINE; P-PHENYLPHENOL; 2,5-DI-TERTBUTYL HYDROQUINONE; HYDROQUINONE; 2,2''-METHLENE-BIS(6TERT - BUTYL-P-CRESOL); 4,4''-THIO-BIS(6-TERT-BUTYL-M-CRESOL); TRIPHENYL PHOSPHITE; TRI(NONYLPHENYL) PHOSPHITE; GLYCEROL MONOSALICYLATE ESTER- DIPROPYLENE GLYCOL MONOSALICYLATE ESTER; THIOACETANILIDE; THIO-CARBANILIDE; THIOACETAMIDE; DIBENZYLTHIOUREA; PHENYLACETOTHIOMORPHOLIDE AND COMBINATIONS THEREOF.