Carboxylate cure

New efficient vulcanization systems have been introduced in the market based on quaternary ammonium salts initially developed in Italy (29—33) and later adopted in Japan (34) to vulcanize epoxy/carboxyl cure sites. They have been found effective in chlorine containing ACM dual cure site with carboxyl monomer (43). This accelerator system together with a retarder (or scorch inhibitor) based on stearic acid (43) and/or guanidine (29—33) can eliminate post-curing. More recently (47,48), in the United States a proprietary vulcanization package based on zinc diethyldithiocarbamate [14324-55-1]... 

Curing. Carboxyl cure sites are incorporated in the ethylene—acryhc terpolymer to permit cross-linking with primary diamines (1,7). Guanidines are added to accelerate the cure. Peroxides may also be used as curing agents in the terpolymer, but generally give inferior properties to vulcanizates based on diamine systems (8). Dipolymers are cured only with peroxides. 

Dicyclo diepoxy carboxylate is a curing agent. A dicyclo diepoxy carboxylate curing agent is sold under Union Carbide Corporation s trademark... 

Carboxylate-based brine solution, 9 33 Carboxylated acrylic polymers, in water-based inks, 14 326 Carboxylation, 9 282 Carboxyl cure sites, in ethylene-acrylic elastomers, 10 698... 

Ethyl acrylate-acrylic and co-polymer (EA/AA, 95/5) Diepoxydicyclohexyl carboxylate (curing agent) Carbon black... 

On the other hand, it has been reported that triarylsulfonium salts are very reactive photoinitiators for the ring opening of epoxy monomers 7J. It was also reported (49) that a coating composed of 4% by weight of triphenylsulfonium hexafluorophosphate in 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexane carboxylate cured in 20 seconds exposure. 

The RTV condensation ciue system consists of four types carboxylate cure, alk-oxide cure, oxime cure, and amine cure. For electronic applications, only the alkoxide cure system is preferred because the byproduct alcohol generated during cure is non-corrosive. 

The carboxyl cure sites offer fast cures and excellent resistance to heat and automotive fluids and low compression set but result in compounds that have shorter scorch with certain curatives. 

The dual chlorine/carboxyl cure sites have the capability of using a very wide variety of cure systems and wUl produce compounds with excellent heat resistance... 

Comparison of Chlorine/Carboxyl Cure-Site Polyacrylate Series ... 

Chlorine/carboxyl cure-site ACM provides a wide variety of cure systems depending on the process and functional properties required. Table 5.14 gives a summary of the various systems used with the expected characteristics for each. Of these, there are four cure systems used in common practice, the Diuron, HyTemp SC-75, HyTemp NPC-25, and Butyl Tuads. A comparison of these cure systems is shown in Table 5.15. 

Cure System Summary for Chlorine/Carboxyl Cure-Site ACM... 

Nipol AR12, AR14, and AR22 with a carboxyl cure site use approximately 0.6 pphr of Diak 1, hexamethylene diaminecarbamate with 2 pphr of Vanax DOTG, di-ortho-tolylguanidine as optimum levels. A basic formulation is given in Table 5.8 [15,18]. 

---