Waterbased
Neoprene liquid dispersions are aqueous anionic colloidal dispersions of chloroprene homopolymers or copolymers. The products have a unique combination of characteristics including excellent film formation, high cohesive strength without curing, elastomeric properties over a wide temperature range, and considerable resistance to the degrading effects of weather, ozone, heat, water, and many oils and chemicals.
Neoprene liquid dispersions contain varying levels of microscopic gel that impart different properties (gel is defined as polymer insoluble in tetrahydrofuran). Four types of Neoprene liquid dispersions are currently produced, Neoprene 571, Neoprene 671A, Neoprene 750, and Neoprene 842A. Neoprene liquid dispersions have pH values of 11 or higher.
Neoprene 571 contains a high modulus copolymer of chloroprene and sulfur. Cured films based on Neoprene 571 have high strength in addition to good oil resistance and low permanent set. Neoprene 571 is used to produce adhesives, coatings, dipped goods, and elasticized concrete.
Neoprene 671A contains a high modulus polychloroprene homopolymer with good wet gel elongation and wet gel tensile strength resulting in good resistance to gel cracking, either alone or when blended with other Neoprene liquid dispersions. Neoprene 671A is used to produce dipped goods, construction mastics, laminating adhesives, impregnated paper, bonded batts, water-based contact bond adhesives, coatings, and foam products.
Neoprene 750 contains a medium modulus, crystallization resistant copolymer of chloroprene and 2,3-dichloro-1,3-butadiene. It forms strong, highly extensible films, and these film properties develop rapidly after coagulation. Neoprene 750 provides films that have characteristics similar to those of natural rubber with respect to softness and pliability, while retaining the superior properties of polychloroprene. Due to its excellent crystallization resistance, products made with Neoprene 750 do not stiffen or lose their desirable ‘snappiness’ with time. Films of very low modulus can be made with Neoprene 750, and wet-gel strength of freshly prepared films is excellent. When used in adhesives, the presence of Neoprene 750 results in very long open times and excellent tack retention. Because of these properties, Neoprene 750 is an outstanding choice for dipped goods, adhesives, and for many other applications.
Neoprene 842A contains a medium modulus polychloroprene homopolymer. It forms films of medium strength that exhibit average crystallization rate. Suggested end uses include bonded batts, laminating adhesives, impregnated paper, industrial coatings, dipped goods, and elasticized concrete.
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