Synergistic peroxide cures for high vinyl rubbers
AssigneeThe Firestone Tire & Rubber Company
InventorMark R. Roodvoets
Life of this patent
Estimating the term…
Abstract
High vinyl polybutadiene having an increased cure rate and superior properties comprises a peroxide curing agent selected from the class consisting of dicumyl peroxide, t-butyl perbenzoate, bis(t-butylperoxy) diisopropyl benzene, and n-butyl 4,4-bis(t-butylperoxy) valerate in combination with a peroxide selected from the class consisting of benzoyl peroxide, bis(4-t-butylcyclohexyl) peroxydicarbonate, t-butyl peroctoate, 2,5-dimethyl-2,5-bis(t-butylperoxy)-hexane, 2,5-dimethyl-2,5-bis(t-butylperoxy)-hexyne-3, and t-butyl hydroperoxide.
Claims24
A peroxide cured high vinyl resin composition comprising by weight, 100 parts of a peroxide cured resin selected from the class consisting of a homopolymer of butadiene or a copolymer of butadiene and styrene containing at least 40 percent of butadiene, at least 80 percent of the butadiene repeating units in the polymer or copolymer being in the 1,2-configuration, said resin cured utilizing from 0.4 to about 4.0 parts based upon an equivalent amount of dicumyl peroxide of a peroxide curing agent selected from a first class consisting of dicumyl peroxide, bis (t-butylperoxy) diisopropyl benzene, t-butyl perbenzoate, and n-butyl 4,4-bis (t-butylperoxy) valerate and from 0.25 to about 2.5 parts based upon an equivalent amount of dicumyl peroxide of a peroxide curing agent selected from a second class consisting of benzoyl peroxide, bis (4-t-butylcyclohexyl) peroxydicarbonate, t-butyl peroctoate, 2,5-dimethyl-2,5-bis(t-butylperoxy)-hexane, 2,5-dimethyl-2,5-bis (t-butylperoxy)-hexyne-3, and t-butyl hydroperoxide.
A curable high vinyl polybutadiene composition comprising by weight, 100 parts of a curable resin selected from the class consisting of a homopolymer of butadiene or a copolymer of butadiene and styrene containing at least 40 percent of butadiene, at least 80 percent of the butadiene repeating units in the polymer or copolymer being in the 1,2-configuration, from 0.4 to about 4.0 parts based upon an equivalent amount of dicuymyl peroxide of a peroxide curing agent selected from a first class consisting of dicumyl peroxide, t-butyl perbenzoate, bis (t-butylperoxy) diisopropyl benzene, and n-butyl perbenzoate, bis(t-butylperoxy) valerate and from 0.25 to about 2.5 parts based upon an equivalent amount of dicumyl peroxide of a peroxide curing agent selected from a second class consisting of benzoyl peroxide, bis (4-t-butylcyclohexyl) peroxydicarbonate, t-butyl peroctoate, 2,5-dimethyl-2,5-bis (t-butylperoxy)-hexane, 2,5-dimethyl-2,5-bis(t-butylperoxy)-hexyne-3, and t-butyl hydroperoxide.
A process for producing a cured high vinyl resin, composition comprising the steps of, adding by weight 100 parts of a curable resin selected from the class consisting of a homopolymer of butadiene or a copolymer of butadiene and styrene containing at least 40 percent of polybutadiene, at least 80 percent of the polybutadiene repeating units in the polymer or copolymer being in the 1,2configuration, adding from 0.4 to about 4.0 parts based upon an equivalent amount of dicumyl peroxide of a peroxide curing agent selected from a first class consisting of dicumyl peroxide, t-butyl perbenzoate, bis (t-butylperoxy) diisopropyl benzene, and n-butyl 4,4-bis (t-butylperoxy) valerate and adding from 0.2 to about 2.5 parts based upon an equivalent amount of dicumyl peroxide of a peroxide curing agent selected from a second class consisting of benzoyl peroxide, bis (4-t-butylcyclohexyl) peroxydicarbonate, t-butyl hydroperoxide, t-butyl peroctoate, 2,5-dimethyl-2,5-bis(t-butylperoxy)-hexane and 2,5-dimethyl-2,5-bis(t-butylperoxy)-hexyne-3 and then curing said curable resin.
Dependencies are inferred from the claim text.