Procedure for curing unsaturated polyester resins

Details Procedure for curing unsaturated polyester resins Procedure for curing unsaturated polyester resins

1983-10-13

1985-06-11

Bleutge, John C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523505, 523507, 523508, 523511, 524325, 524358, 525 21, 525 27, C08L 6706

Patent

active

045229635

ABSTRACT:
The invention is a process for monitored cross-linking of unsaturated polyester resins in the presence of a metal-ion-containing accelerator and an organic peroxide initiator, complemented by promotor in some cases. According to this process, the cross-linking is carried out in the presence of one of the compounds from the group consisting of alizarin, sodium alizarinesulfonate, 3-nitroalizarin, chinizarine, or purpurin, where the substituents are H atoms or OH, NO.sub.2, SO.sub.3 H, or SO.sub.3 Na groups with the restriction that at least one of them should be other than H, which is present in a ratio of from 0.005 to 0.5, preferably 0.01 to 0.1 percent (mass/mass), compared to the mass of the polyester resin, and cross-linking is trailed by the color change in the system. The invention permits all of the chemical-technological processes involved in the processing of unsaturated polyester resins to be monitored visually.

REFERENCES:
patent: 3382296 (1968-05-01), Tenquist
patent: 4232136 (1980-11-01), Kovacsay
patent: 4359570 (1982-11-01), Davis

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