Polyurethane elastomer and an improved hypoallergenic polyurethane flexible glove prepared therefrom
AssigneeWarner-Lambert Company
InventorsCharles W. McGary, Jr., Vincent J. Pascarella, Delmer R. Rhodes, Robert A. Taller
Life of this patent
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Abstract
A soft, low modulus, non-crystalline segmented polyurethane characterized by a 100% modulus less than about 250 psi, initial tensile set less than about 30% and tensile strength of about 3500 to 6500 psi obtained by balancing the percent hard segment and the degree of cross-linking within the ranges 14 to 25% hard segment and 5,000 to 30,000 molecular weight per cross-link in a segmented polyurethane; and a flexible glove for use by surgeons and others which is easily donned and comfortable on the hand, wherein the glove forming material consists essentially of the aforesaid polyurethane.
Claims42
A flexible glove made from a polyurethane having 100% modulus less than approximately 250 psi, a 300% modulus of 200 to 450 psi, initial tensile set less than approximately 30% and tesile strength of approximately 3500 to 6500 psi.
A polyurethane elastomer having 100% modulus less than approximately 250 psi, a 300% modulus of 200 to 450 psi, tensile of approximately 3500 to 6500 psi, and less than approximately 30% initial tensile set, wherein said polyurethane comprises approximately 14 to 25% hard segment, is chemically cross-linked to provide approximately 5,000 to 30,000 M.sub.c, and is derived from an aromatic or alicyclic polyisocyanate and an approximately 500 to 5000 average molecular weight long chain diol that is crosslinked with a polyhydroxy cross-linking agent.
A flexible glove formed from a polyurethane which is the reaction product of:
- an aromatic or alicyclic diisocyanate selected from the group consisting of 4,4'-diphenyl methane diisocyanate, toluene diisocyanate, isophorone diisocyanate and methylene bis (4-cyclohexyl isocyanate),
- a long chain diol having a molecular weight of approximately 500 to 5000 selected from the group consisting of poly(ethylene adipate) glycol, poly(ethylene succinate) glycol, poly(ethylene sebacate) glycol, poly(butylene adipate) glycol, poly(ethylene-butylene adipate) glycol, poly(diethylene ether adipate) glycol, and mixtures thereof,
- a short chain diol extender having 2 to 6 carbon atoms selected from the group consisting of ethylene glycol, propylene glycol, 1,4-butane diol, and neopentyl glycol,
- and a polyhydroxy crosslinking agent, wherein said diisocyanate and said extender are present in a combined amount which provides approximately 17 to 22% hard segment and said crosslinking is present in an amount which provides a degree of crosslinking of approximately 5000 to 30,000 M.sub.c wherein said polyurethane provides a 100l% modulus less than approximately 250 psi, a 300% modulus of 200 to 450 psi, initial tensile set less than approximately 30%, and tensile strength of approximately 3500 to 6500 psi.
A polyurethane elastomer which is the product of:
- an aromatic or alicyclic diisocyanate selected from the group consisting of 4,4'-diphenyl methane diisocyanate, toluene diisocyanate, isophorone diisocyanate and methylene bis (4-cyclohexyl isocyanate),
- a long chain diol having a molecular weight of approximately 500 to 5000 selected from the group consisting of poly(ethylene adipate) glycol, poly(ethylene succinate) glycol, poly(ethylene sebacate) glycol, poly(butylene adipate) glycol, poly(ethylene-butylene adipate) glycol, poly(diethylene ether adipate) glycol,
- a short chain diol extender having 2 to 6 carbon atoms selected from the group consisting of ethylene glycol, propylene glycol, 1,4-butane diol, and neopentyl glycol,
- and a polyhydroxy cross-linking agent, wherein said diisocyanate and said extender are present in a combined amount which provides approximately 17 to 22% hard segment and said crosslinking agent is present in an amount which provides a degree of crosslinking of approximately 5000 to 30,000 M.sub.c wherein said polyurethane provides a 500% modulus less than approximately 250 psi, a 300% modulus of 200 to 450 psi, a tensile of approximately 3500 to 6500 psi, and less than approximately 30% initial tensile set.
Dependencies are inferred from the claim text.