Thiolic compound polymerization cocatalysts
AssigneesAkzo N.V., Saint Peter S.r.l.
InventorGualtiero Giovando
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Abstract
Accelerator compositions for the free radical polymerization of unsaturated polyesters and for the curing of unsaturated polyesters and polyurethanes are disclosed. More particularly, use is made of complexes of thiolic compounds with metal salts as the accelerators. In more preferred embodiments, the accelerators also include oxygen-containing compounds or phosphorus-containing compounds. Also disclosed are curable resin compositions comprising these accelerators and polymerization and curing processes employing these accelerators.
Claims26
An accelerator composition for the curing or polymerization of resins selected from the group consisting of unsaturated maleic, allylic, vinylic, and polyester resins, epoxy resins and polyurethanes, said composition comprising a complex of a salt of a metal selected from the group consisting of lithium, aluminum, magnesium manganese, zinc and tin, and a compound selected from the group consisting of thiols, which are selected from the group consisting of dipentene-dimercaptan;
- ethylcyclohexyldimercaptan;
- ethylene-1,2-bis-3-mercaptoacetate;
- ethylene-1,2-bis-3-mercaptopropionate;
- 1,2,3-propanetrithiol;
- 1,2,6-hexanetrithiol;
- pentaerythritolthiol;
- pentaerythritoltetramercaptoacetate;
- pentaerythritoltetramercaptopropionate;
- thioesters of polyalcohols, thioesters of sugars, thiolic derivatives of the formula:
- ##STR16## wherein R is a linear alkyl group having 3-30 carbon atoms and n is an integer of 2-6, and adducts of these thiols with epoxides and anhydrides.
A process for the curing of a resin selected from the group consisting of unsaturated maleic, allylic, vinylic and polyester resins, epoxy resins and polyurethanes, said process comprising the step of curing said resin in the presence of a curing agent composition comprising a curing agent, an effective amount of at least one composition as claimed in claim 30 to accelerate said curing and 0-50 weight percent of at least one ethylenically unsaturated reactive monomer.
Dependencies are inferred from the claim text.