Abstract: Thiols, or thiolate salts, disulfides and sulfenamides of certain pyrazines are effective accelerators in the sulfur vulcanization of rubber. These compounds, based on 2-pyrazine, show improved rates of vulcanization compared with known sulfenamide accelerators.

Abstract: Heterocyclic thiol sulfenimide compounds are useful as an accelerator in the curing of natural and/or synthetic rubbers. The compound can be represented by the formula ##STR1## wherein each of A.sup.1 and A.sup.2, independently, is at least one heterocyclic ring containing one or more nitrogen atoms therein, or at least one heterocyclic ring containing one or more nitrogen atoms therein and (1) one or more hydrocarbyl substituents, or (2) one or more electron withdrawing groups, or (3) one or more electron releasing groups, wherein A.sup.

Abstract: Heterocyclic thiol sulfenimide compounds are useful as an accelerator in the curing of natural and/or synthetic rubbers. The compound can be represented by the formula ##STR1## wherein each of A.sup.1 and A.sup.2, independently, is at least one heterocyclic ring containing one or more nitrogen atoms therein, or at least one heterocyclic ring containing one or more nitrogen atoms therein and (1) one or more hydrocarbyl substituents, or (2) one or more electron withdrawing groups, or (3) one or more electron releasing groups, wherein A.sup.

Abstract: Heterocyclic thiol sulfenimide compounds are useful as an accelerator in the curing of natural and/or synthetic rubbers. The compound can be represented by the formula ##STR1## wherein each of A.sup.1 and R.sup.2, independently, is at least one heterocyclic ring containing one or more nitrogen atoms therein, or at least one heterocyclic ring containing one or more nitrogen atoms therein and (1) one or more hydrocarbyl substituents, or (2) one or more electron withdrawing groups, or (3) one or more electron releasing groups, wherein A.sup.

Abstract: The present invention relates to novel compounds corresponding to the formula: ##STR1## wherein R.sub.1 and R.sub.4 may be the same or different, and each is a lower alkyl radical; R.sub.2 and R.sub.3 may be the same or different, and each is a substituted piperidine radical; M is equal to the total number of monomer units in the polymer chain, and is of a magnitude sufficient to provide a polymer having a molecular weight of at least 500; W is equal to at least 0.5, X is equal to at least 0.1 but not greater than 0.2, Y is equal to at least 0.1, Z is equal to at least 0.05 but not greater than 0.2, and W plus X plus Y plus Z is equal to 1.These novel compounds are useful as stabilizers for a wide variety of organic materials and are prepared by transesterification of a suitable acrylate-methacrylate copolymer.

Abstract: The present invention relates to novel compounds corresponding to the formula: ##STR1## wherein R.sub.1 and R.sub.4 may be the same or different, and each is a lower alkyl radical; R.sub.2 and R.sub.3 may be the same or different, and each is a substituted piperidine radical; M is equal to the total number of monomer units in the polymer chain, and is of a magnitude sufficient to provide a polymer having a molecular weight of at least 500; W is equal to at least 0.5, X is equal to at least 0.1 but not greater than 0.2, Y is equal to at least 0.1, Z is equal to at least 0.05 but not greater than 0.2, and W plus X plus Y plus Z is equal to 1.These novel compounds are useful as stabilizers for a wide variety of organic materials and are prepared by transesterification of a suitable acrylate-methacrylate copolymer.

Abstract: Amide or 3-alkylation of 2,2,5,5-tetra-substituted imidazolidin-4-ones, using either monofunctional or polyfunctional cyclic ethers as alkylating agents, under basic conditions, or an ethylene carbonate. The cyclic ether reactants may be aldehydes or ketones having a single carbon atom in the ring. The alcohols obtained from ether addition to the 2,2,5,5-tetrasubstituted imidazolidin-4-ones may be converted to esterified derivatives by treatment with carboxylic acids or esters. Representative esters from mono- or polyalkylated imidazolidinones possess superior light stabilizing activity. Also embraces new compounds that are useful as light stabilizers for synthetic polymers.