초록 ▼

A waterborne dispersion of a polyurethane polymer is disclosed, which is useful as a film having improved mechanical properties. More particularly, the film has properties comparable to rubber; including, a percentage elongation greater than 700%; a tensile strength greater than 3500 psi; a 100% mod

A waterborne dispersion of a polyurethane polymer is disclosed, which is useful as a film having improved mechanical properties. More particularly, the film has properties comparable to rubber; including, a percentage elongation greater than 700%; a tensile strength greater than 3500 psi; a 100% modulus below 450 psi; a 300% modulus below 700 psi; and, a 500% modulus below 1500 psi. The film can be prepared in the absence of a solvent, thus making it attractive for a variety of protection products for medical and industrial applications such as gloves, condoms, catheters, and the like. The polymer is useful as a coating for textiles, such as backcoatings, fabric or fiber saturants, finishes, or transfer coatings, or other textile and non-textile applications where good elastomeric properties would be useful.

대표청구항 ▼

[ Having thus described the preferred embodiments, the invention is claimed as follows:] [1.] A waterborne polyurethane dispersion wherein the polyurethane comprises the reaction product of(a) a polyisocyanate component selected from the group consisting of an aliphatic polyisocyanate, an aromatic p

[ Having thus described the preferred embodiments, the invention is claimed as follows:] [1.] A waterborne polyurethane dispersion wherein the polyurethane comprises the reaction product of(a) a polyisocyanate component selected from the group consisting of an aliphatic polyisocyanate, an aromatic polyisocyanate, a cycloaliphatic polyisocyanate, and an araliphatic polyisocyanate;(b) a long-chain, active hydrogen containing material, containing 2 or more active hydrogens per molecule selected from the group consisting of a polyamide, a polyester polyol, a polyether polyol and mixtures thereof, having an average molecular weight from about 2900 to about 5500 Daltons, and being a liquid at 90.degree. F. or lower; and(c) a water-solubilizing compound having water-solubilizing groups selected from the group consisting of dimethylol propanoic acid, tartaric acid, dimethylol butanoic acid, glycollic acid, thioglycollic acid, lactic acid, malic acid, dihydroxymalic acid, dihydroxytartaric acid, and 2,6-dihydroxybenzoic acid and present in a range of from about 2 wt. % to about 4 wt. % of the total prepolymer,to form an isocyanate prepolymer, having a NCO to OH ratio of about 1.3/1 to about 4.0/1, which is neutralized by reaction with a tertiary amine, dispersed in water, and chain extended by reaction with an amine, said polyurethane dispersion, when in the form of a film, having elastic properties comparable to rubber, a tensile strength greater than about 3500 psi, a 100% modulus below 450 psi, a 500% modulus below 1500 psi, and a percentage elongation greater than about 700% at 72.degree. F.