Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1991-10-21
1993-08-10
Garvin, Patrick P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526117, 526123, 526200, 526209, 526212, 526216, 528275, 528277, 528280, 502164, 502167, 502168, 502169, 502170, 502171, 502172, 502160, C08F 406, C08F 408, C08F 410, C08F 426
Patent
active
052350100
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to polymerization cocatalysts for the curing of unsaturated maleic, allylic, vinylic and epoxide-type polyesters. The cocatalysts comprise organic oxygen-containing compounds and at least one salt of a metal chosen from copper, lithium, vanadium, manganese, magnesium, cobalt and iron.
It is known to use lithium salts for the curing of unsaturated polyesters. For example, U.S. Pat. Nos. 3,539,479 and 3,663,599 disclose the use of lithium salts for the polymerization of unsaturated polyesters. The lithium salts include lithium decanoate, lithium thiocyanate, lithium acrylate, lithium methacrylate and lithium soaps of unsaturated and saturated aliphatic carboxylic acids.
British patent 2,085,464 suggests the use of cobalt, manganese or lithium naphthenate or cobalt or tin octanoate as hardening accelerators for the peroxide curing of unsaturated polyesters. Further, Japanese patent J5-0032-284 discloses the heat hardening of polyester resins in the presence of peroxides and acid cobalt salts, acetoacetate or ascorbic acid compounds.
"Melt Polymerization of Bisphenol A (BPA) Cyclic Polycarbonate Oligomers; Rheokinetics of Polymerization Relevant to Reactive Processing," Stewart, K. R., Polym. Prepr. 89; Vol. 30 (2); pp. 575-76, discloses the use of lithium salts or acetylacetonates as polymerization catalysts for the polymerization of cyclic polycarbonate oligomers with bisphenol A. Although the polymerization catalyst used here is similar to that of the present invention, the polymerization system is quite different since it involves phenolic compounds.
Another example of phenolic-resin curing is given in JP-62-053330 wherein lithium acetylacetonate is employed as a hardening accelerator in the crosslinking of phenolic resins in the presence of spiro orthocarbonates.
Finally, DE 30 16 051 discloses the use of a hardening accelerator for unsaturated resins which comprises a mixture of a ketimine and an (in)organic cupric or ferric compound in combination with a standard hardener.
None of the foregoing curing systems for unsaturated polyesters is entirely satisfactory. They suffer from the disadvantages that some must be operated at high temperatures, they often give discoloration of the resultant polymer and they are slow.
It is therefore the object of the present invention to overcome one or more of these disadvantages by providing a novel curing accelerator for unsaturated allylic, maleic, vinylic and epoxidic polyesters, a curable composition of a resin and at least one curing accelerator and a process for curing these materials in the presence of this curing accelerator. These and other objects of the present invention will be apparent to one of ordinary skill in the art from the summary and detailed descriptions which follow.
SUMMARY
For the curing of unsaturated maleic, vinylic, allylic and epoxide-type polyesters, use as accelerators or cocatalysts is made of salts of a metal chosen from among lithium, copper, magnesium, manganese, vanadium, iron, and cobalt, in combination with one or more oxygen-containing compounds, that are capable of forming complexes with such salts and include at least one functional group selected from aldehyde, ketone, ether, ester and alcohol. Also within the invention are a curable resin composition including these accelerators and a curing process employing these accelerators.
DESCRIPTION
The present invention refers generally to processes for the curing of unsaturated maleic, allylic, vinylic, and epoxide-type polyesters by means of radical or ionic-radical catalysis, and provides accelerators/promoters for the curing process.
Certain metal salts that can form complexes with organic oxygen compounds, are able to substantially accelerate the process of curing of the abovementioned resins.
Salts of copper, lithium, magnesium, manganese, vanadium, cobalt and iron act as accelerators in the curing process in the presence of conventional peroxidic initiators in the presence of organic oxygen-containing compounds which are capable of forming co
REFERENCES:
patent: 3539479 (1970-11-01), Alberts
patent: 3663599 (1972-05-01), Noshimura et al.
patent: 4138385 (1979-02-01), Uffner et al.
patent: 4175064 (1979-11-01), Landau et al.
patent: 4426246 (1984-05-01), McGinniss
Akzo N.V.
Fennelly Richard P.
Garvin Patrick P.
Morris Louis A.
Saint Peter S.r.l.
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