Impact resistant polyurethane and method of manufacture thereof
AssigneeSimula, Inc.
InventorEdwin C. Slagel
Life of this patent
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Abstract
The present invention is an optically clear, high hardness, impact resistant polyurethane which provides exceptionally high heat distortion temperatures and excellent chemical resistance. The invention is particularly useful for transparency applications that require excellent impact resistance coupled with high heat distortion temperatures, such as architectural glazings vehicles, glazings, riot shields, aircraft canopies, face masks, visors, opthalmic and sun lenses, protective eyewear, and transparent armor.
Claims37
A transparent, non-elastomeric, high hardness, impact resistant polyurethane material comprising the reaction product of:
- (a) a polyurethane prepolymer prepared by reaction of an aliphatic or cycloaliphatic diisocyanate with at least one OH containing intermediate having a weight average molecular weight of from about 400 to about 2000 selected from the group consisting of polyester glycols, polycaprolactone glycols, polyether glycols, polycarbonate glycols, and mixtures thereof in an equivalent ratio of about 2.5 to 4.0 NCO/1.0 OH;
- and
- (b) at least one first aromatic diamine curing agent selected from the group consisting of 2,4-diamino-3,5-diethyl-toluene, 2,6-diamino-3,5-diethyl-toluene, and mixtures thereof in an equivalent ratio of about 0.85 to 1.02 NH.sub.2 /1.0 NCO.
A transparent, non-elastomeric high hardness, impact resistant polyurethane material comprising the reaction product of:
- (a) a polyurethane prepolymer prepared by reaction of a cycloaliphatic diisocyanate selected from the group consisting of 4,4'- methylenebis(cyclohexyl iso-cyanate), 3-isocyanato-methyl-3,5,5-trimethylcyclohexyl-isocyanate, metatetramethylxylene diisocyanate, and mixtures thereof with at least one OH-containing intermediate having a weight average molecular weight of from about 400 to about 2000 selected from the group consisting of:
- (a) esterification products of adipic acid with one or more diols selected from the group consisting of 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, and 1,10-decanediol;
- (b) reaction products of E-caprolactone with one or more diols selected from the group consisting of 1,4-butane diol, 1,6-hexane diol, neopentyl glycol, and 1,10-decanediol;
- (c) polytetramethylene glycol;
- (d) aliphatic polycarbonate glycols;
- and (e) mixtures of such OH-containing intermediates in an equivalent ratio of about 2.5 to 4.0 NCO/1.0 OH;
- and
- (b) at least one diamine curing agent selected from the group consisting of 2,4- diamino-3,5-diethyl-toluene, 2,6-diamino-3,5-diethyl-toluene, and mixtures thereof, in an equivalent ratio of about 0.95 to 1.02 NH.sub.2 /1.0 NCO, wherein the polyurethane material has a heat distortion temperature of at least 300.degree. F. at 264 psi.
Dependencies are inferred from the claim text.