400 and an amine equivalence of 105 was used and in two others a polyoxypropylenetriamine of m.w.

Specifically, about 1 mole of hydroxyalkyl carbamate forming compound for each amino group of the polyoxyalkylenepolyamine is required. The presence of resins containing polyglycidyl ethers of polyhydric phenols in amounts greater than 50% by weight of the resin constituent, and more preferably 80% by weight and more preferably 100% by weight has been shown to greatly enhance the desirable properties of the cured material, especially the adhesive strength.Likewise, although all of the disclosed amine curing agents are generally useful to cure the resin it has been found that those resins containing curing agents wherein the amino moieties are separated by large aliphatic or oxyalkylene chains do not demonstrate a substantial increase in adhesive strength in the presence of the dihydroxyalkyl carbamate terminated additives. For many blends, use of the Fox Equation can provide a reasonable estimate of the Tg of the fully cured resin. 3,666,788 issued to Rowton, May 30, 1972.Preferred such compounds are the hydrogenated cyanoethylated polyoxypropylene triamines.The dicarbamate terminated polyether additive can generally be described as polyoxyalkylene containing materials having terminal hydroxyalkyl carbamate groups and a molecular weight of from about 2000 to about 3000. The synthesis and characterization of UV curable resins based on glycidyl carbamate chemistry have been explored. Suitable such amide compounds are, for example, the condensation product of a polyamine and a dimerized fatty acid produced in accordance with U.S. Pat. Glycidyl carbamate (GC) functional resins have been used to obtain crosslinked coatings with a wide range of properties using several crosslinking techniques such as epoxy-amine, self-crosslinking, and sol–gel.

The most preferred polyoxyalkylene polyamines are the polyoxypropyl diamines wherein X is a methyl radical, n is a number from 1 to 10, Z is a 1,2-propylene radical and r is about 2. 1, 1975.

No. The amount of additive effective in bringing about the increase adhesive property is somewhat empirical and will depend upon the resin, the amine curing agent, and the use of an accelerator. Such a stoichiometry may not, however, always provide the most desirable processing characteristics or combination of particular properties. Into a suitable reaction vessel, equipped with stirring apparatus, were added 1370 grams (0.72 moles) of a polyoxypropylenepolyamine having a molecular weight of approximately 2000, and an analysis of 1.01 milliequivalents (meg.) When choosing between hardeners that have nominally similar processing and performance characteristics, one should not simply go by price alone, but rather, do a calculation, taking into account the cost per pound (or perhaps, unit volume) of the final, cured material. Hardeners with higher Tg values, such as aromatic amines, may require elevated temperatures to achieve full curing and attain their maximum Tg.

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In appropriate examples, the cured products were subjected to standard American Society for Testing Materials (ASTM) tests for Izod impact strength (ASTM designation D-256), flexural strength and modulus of elasticity in flexure (ASTM designation D-790-66), tensile strength and elongation at break (ASTM designation D-638-64 T), deflection temperature (ASTM designation D-648-56) and hardness (ASTM designation 2240-64 T) and/or hardness Shore D, and peel strength (ASTM D-903). Increasing the modulus by either undercuring or formulating away from a 1:1 stoichiometry leaves unreacted groups in the polymer, which may affect durability. More specifically, these compounds are polyoxyalkylene compounds having terminal hydroxyalkyl carbamate groups, of the formula: ##STR3## wherein each R is, independently, hydrogen; or, a branched or straight chain alkyl radical of from 1 to about 6 carbon atoms, and more preferably from 1 to about 4; X is hydrogen, a methyl radical or an ethyl radical; Z is a hydrocarbon alkylene radical having 2 to 5 carbon atoms and n is a number selected such that the molecule of the above formula has a molecular weight of from about 2000 to 3000. 230 having an equivalent weight of 58 to which were added the indicated amounts of the dicarbonate prepared in Example I.

Polyetheramines (PEAs) exhibiting reduced reactivity due to steric hindrance near the amine (e.g.

Der weltweite Verbrauch an Carbamaten lag 1995 bei etwa 30.000 Tonnen. Despite the latter, an understanding of the Tg can aid in solving formulation and/or performance problems.

Also, degradation pathways proposed to explain high temperature behavior (typically measured in nitrogen), such as those involving formation of free radicals, bear little resemblance to lower temperature thermooxidative degradation.1

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