Claims
- 1. A non-blooming energy-absorbing polyurethane interlayer comprising the polymerizate of:
- (A) an organic polyisocyanate,
- (B) a polylactone polyol having a hydroxyl number within the range of 62 to 140 inclusive formed from polymerizing an unsubstituted lactone having 6 to 8 carbon atoms with an organic polyhydroxyl-containing compound selected from the class consisting of:
- (1) aliphatic diols free of alkyl substitution and oxyalkylated products of these diols,
- (2) a hydroxyl-terminated polyester having a hydroxyl number below 600 formed from an organic polycarboxylic acid containing from 3 to 10 carbon atoms and aliphatic diols free of alkyl substitution and oxyalkylated products of these diols,
- (C) a compound containing at least two active hydrogens per molecule reactive with the isocyanate group having a molecular weight less than 250 selected from the class consisting of aliphatic diols free of alkyl substitution, aliphatic triols and mixtures thereof; the equivalent ratio of (A)/(B)/(C) being within the following range: 1.35-4.4/1.000/0.5-3.
- 2. The interlayer of claim 1 in which the organic polyisocyanate is an organic diisocyanate.
- 3. The interlayer of claim 2 which the organic diisocyanate is an aliphatic diisocyanate.
- 4. The interlayer of claim 3 in which the aliphatic diisocyanate is a cycloaliphatic diisocyanate.
- 5. The interlayer of claim 4 in which the cycloaliphatic diisocyanate is 4,4'-methylene-bis-(cyclohexyl isocyanate), wherein about 55 percent of the NCO groups are trans and 45 percent of the NCO groups are cis.
- 6. The interlayer of claim 1 in which the aliphatic diol (1) is a hydroxy-terminated alkylene diol containing from 2 to 10 carbon atoms.
- 7. The interlayer of claim 6 in which the alkylene diol is selected from the class consisting of ethylene glycol, 1,4-butanediol, 1,5-pentanediol and 1,6-hexanediol.
- 8. The interlayer of claim 1 in which the hydroxyl-terminated polyester (2) has a hydroxyl number between 140 to 300.
- 9. The interlayer of claim 1 in which the aliphatic diol used to prepare the hydroxy-terminated polyester (2) is selected from the class consisting of ethylene glycol, 1,4-butanediol, 1,5-pentanediol and 1,6-hexanediol.
- 10. The interlayer of claim 1 in which the unsubstituted lactone is epsilon-caprolactone.
- 11. The interlayer of claim 1 which has a thickness of from 15 to 60 mils (38.10 .times. 10.sup.-5 to 152.40 .times. 10.sup.-5 m).
- 12. The interlayer of claim 1 in which the compound (C) is an aliphatic polyol free of alkyl substitution.
- 13. The interlayer of claim 12 in which the aliphatic polyol is selected from the class consisting of diols, triols and mixtures thereof.
- 14. The interlayer of claim 13 in which the aliphatic polyol is selected from the class consisting of 1,4-butanediol and trimethylolpropane.
- 15. The interlayer of claim 1 which is of substantially uniform thickness with the rate of change in thickness of the interlayer being sufficiently small to produce a diopter of less than 0.006.
- 16. The interlayer of claim 1 which has a minimum light transmission of greater than 70 percent and has less than 2 percent haze.
- 17. The polyurethane interlayer of claim 1 which has a mean penetration velocity at 0.degree. F., 70.degree. F. and 120.degree. F. (-18.degree. C., 21.degree. C. and 49.degree. C.) of at least 20 miles per hour (32.180 km/hr) when an approximately 0.030-0.040 inch (0.0762 .times. 10.sup.-2 to 0.1016 .times. 10.sup.-2 m) thick sample of the polyurethane interlayer is laminated to a 1/8 inch (0.3175 .times. 10.sup.-2 m) thick 12 inch by 12 inch (30.48 .times. 10.sup.-2 m by 30.48 .times. 10.sup.-2 m) float glass sheet to form a bilayer laminate and the laminate held rigid and impacted on the polyurethane side with a 5-pound (22.675 .times. 10.sup.-1 kg) freely falling steel ball.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of application Ser. No. 474,645, filed May 30, 1974, published as United States Published Patent Application B474,645 on Mar. 2, 1976, and subsequently abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
B474645 |
Chang |
Mar 1976 |
|
3186971 |
Hostettler et al. |
Jun 1965 |
|
3931113 |
Seeger et al. |
Jan 1976 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
474645 |
May 1974 |
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