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US 5,962,617 AGranted
Impact resistant polyurethane and method of manufacture thereof
AssigneeSimula, Inc.
InventorEdwin C. Slagel
Life of this patent
Estimating the term…
Abstract
The present invention is an optically clear 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 glazings for buildings, vehicles, riot shields, aircraft canopies, and face masks.
Claims85
A polyurethane material comprising the reaction product of:
- (a) a polyurethane prepolymer prepared by reaction of methylenebis(cyclohexyl isocyanate) with an OH-containing intermediate having a weight average molecular weight between about 500 and about 1,200 selected from the group consisting of polyester glycols, polyether glycols, and mixtures thereof in an equivalent ratio of 2.5 to 4.5 NCO/1.0 OH;
- and
- (b) an aromatic diamine curing agent having the formula:
- ##STR7## wherein R.sub.1 and R.sub.2 are each independently selected from the group consisting of methyl, ethyl, propyl and isopropyl groups, and R.sub.3 is chlorine, in an equivalent ratio of 0.95 to 1.02 NH.sub.2 /1.0 NCO.
1 more element
A method for preparing polyurethane comprising the steps of:
- (a) reacting methylenebis(cyclohexyl isocyanate) with an OH-containing intermediate having a weight average molecular weight between about 500 and about 1,200 selected from the group consisting of polyester glycols, polyether glycols, and mixtures thereof in an equivalent ratio of 2.5 to 4.5 NCO/1.0 OH to form a prepolymer;
- and
- (b) reacting the prepolymer with an aromatic diamine curing agent having the formula:
- ##STR12## wherein R.sub.1 and R.sub.2 are each independently selected from the group consisting of methyl, ethyl, propyl and isopropyl groups, and R.sub.3 is chlorine, in an equivalent ratio of 0.95 to 1.02 NH.sub.2 /1.0 NCO.
1 more element
A polyurethane material comprising the reaction product of:
- (a) a polyurethane prepolymer prepared by reaction of 4,4'-methylenebis (cyclohexyl isocyanate) with a polyester glycol having a weight average molecular weight between about 600 and about 900 selected from the group consisting of polyester glycols prepared from 1,6-hexanediol and adipic acid, polyester glycols prepared from 1,10-decanediol and adipic acid, polyester glycols prepared from 1,10-decanediol and caprolactone, and mixtures thereof in an equivalent ratio of 2.5 to 4.5 NCO/1.0 OH;
- and
- (b) 4,4'-methylenebis (3-chloro-2,6-diethylaniline) as a curing agent in an equivalent ratio of 0.95 to 1.02 NH.sub.2 /1.0 NCO,
- wherein the polyurethane material has a heat distortion temperature of a least 300.degree. F. at 264 psi.
1 more element
A method for preparing polyurethane comprising the steps of:
- (a) mixing 4,4'-methylenebis(cyclohexyl isocyanate) with an OH-containing intermediate having a weight average molecular weight of between about 500 and about 1,200 selected from the group consisting of polyester glycols, polyether glycols, and mixtures thereof in an equivalent ratio of 2.5 to 4.5 NCO/1.0 OH at about 180-200.degree. F. to produce a mixture;
- (b) heating the mixture with a heat source under dry nitrogen to about 190-275.degree. F. so that said 4,4'-methylenebis(cyclohexyl isocyanate) reacts with said OH-containing intermediate to produce a prepolymer;
- (c) removing the heat source and cooling the prepolymer to below 160.degree. F.;
- (d) determining the percent of NCO in the prepolymer:
- (e) adding 4,4'-methylenebis(cyclohexyl isocyanate) to the prepolymer so that the equivalent weight of the prepolymer is 415-425;
- (f) adding 4,4'-methylenebis(3-chloro-2,6-diethylaniline) at an equivalent ratio of 0.95 to 1.02 NH.sub.2 /1.0 NCO;
- and
- (g) curing the polyurethane at 240-275.degree. F.
5 more elements
A method for preparing polyurethane comprising the steps of:
- (a) reacting 4,4'-methylenebis(cyclohexyl isocyanate) with a polyester glycol having a weight average molecular weight between about 600 and about 900 selected from the group consisting of polyester glycols prepared from 1,6-hexanediol and adipic acid, polyester glycols prepared from 1,10-decanediol and adipic acid, and polyester glycols prepared from 1,10-decanediol and caprolactone, and mixtures thereof in an equivalent ratio of 2.5 to 4.5 NCO/1.0 OH;
- and
- (b) reacting the prepolymer with 4,4'-methylenebis(3-chloro-2,6-diethylaniline) as a curing agent in an equivalent ratio of 0.95 to 1.02 NH.sub.2 /1.0 NCO.
A polyurethane material comprising the reaction product of:
- (a) a polyurethane prepolymer prepared by reaction of methylenebis(cyclohexyl isocyanate) with an OH-containing intermediate having a weight average molecular weight between about 500 and about 1,200 selected from the group consisting of polyester glycols, polyether glycols, and mixtures thereof in an equivalent ratio of 2.5 to 4.5 NCO/1.0 OH;
- and
- (b) an aromatic diamine curing agent having the formula:
- ##STR20## wherein R.sub.1 and R.sub.2 are each independently selected from the group consisting of methyl, ethyl, propyl and isopropyl groups, and R.sub.3 is selected from the group consisting of hydrogen and chlorine, in an equivalent ratio of 0.95 to 1.02 NH.sub.2 /1.0 NCO;
- wherein the polyurethane material has a heat distortion temperature in the range of 210.degree. F. to 325.degree. F. at 264 psi.
2 more elements
Dependencies are inferred from the claim text.