Transparent, impact-resistant polyesterurethane laminates
First Claim
1. An optically-clear, energy-absorbing laminate, comprising at least one glass sheet bonded to a sheet of a substantially unreacted isocyanate free, thermoplastic, transparent polyesterurethane that is the reaction product of (a) essentially linear hydroxy-terminated polyester having a liquidus temperature of at least 44°
- C., said polyester being selected from the group consisting of poly(1,4-butylene adipate) and poly(1,4-butylene azelate) having a molecular weight of about 2000, (b) 4,4'"'"'-methylene-bis-(cyclohexyl isocyanate), and (c) aliphatic diol containing from 4 to 8 carbon atoms, the mole ratio of (c) to (a) being from about 1.5;
1 to about 5;
1, the isocyanate groups provided by (b) being substantially numerically equivalent to the sum of hydroxyl groups provided by (c) and (a) whereby to provide a polyesterurethane that is substantially free of unreacted isocyanate groups, said mole ratio of (c) to (a) being so proportioned within said range that a rigidly held laminate prepared from about 0.030 inch thick sheeting of said polyesterurethane sandwiched between two 12" ×
12" ×
1/8" glass sheets is non-brittle at 0°
F. and exhibits a mean penetration velocity of at least 20 miles per hour at laminate temperatures of 0°
F. and 70°
F., and a mean penetration velocity of at least 17 miles per hour at a laminate temperature of 120°
F. when impacted with a five pound free falling steel ball.
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Accused Products
Abstract
Laminated glass articles useful as automobile windshields or in other safety glass applications comprising a polyesterurethane and at least one sheet of glass are described. The polyesterurethane is a thermoplastic, transparent material that is formed preferably from an aliphatic polyester, e.g., poly(1,4-butylene adipate), a cycloaliphatic diisocyanate, e.g., 4,4'"'"'-methylene-bis (cyclohexyl isocyanate), and a monomeric aliphatic diol, e.g., 1,4-butane diol.
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Citations
26 Claims
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1. An optically-clear, energy-absorbing laminate, comprising at least one glass sheet bonded to a sheet of a substantially unreacted isocyanate free, thermoplastic, transparent polyesterurethane that is the reaction product of (a) essentially linear hydroxy-terminated polyester having a liquidus temperature of at least 44°
- C., said polyester being selected from the group consisting of poly(1,4-butylene adipate) and poly(1,4-butylene azelate) having a molecular weight of about 2000, (b) 4,4'"'"'-methylene-bis-(cyclohexyl isocyanate), and (c) aliphatic diol containing from 4 to 8 carbon atoms, the mole ratio of (c) to (a) being from about 1.5;
1 to about 5;
1, the isocyanate groups provided by (b) being substantially numerically equivalent to the sum of hydroxyl groups provided by (c) and (a) whereby to provide a polyesterurethane that is substantially free of unreacted isocyanate groups, said mole ratio of (c) to (a) being so proportioned within said range that a rigidly held laminate prepared from about 0.030 inch thick sheeting of said polyesterurethane sandwiched between two 12" ×
12" ×
1/8" glass sheets is non-brittle at 0°
F. and exhibits a mean penetration velocity of at least 20 miles per hour at laminate temperatures of 0°
F. and 70°
F., and a mean penetration velocity of at least 17 miles per hour at a laminate temperature of 120°
F. when impacted with a five pound free falling steel ball. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- C., said polyester being selected from the group consisting of poly(1,4-butylene adipate) and poly(1,4-butylene azelate) having a molecular weight of about 2000, (b) 4,4'"'"'-methylene-bis-(cyclohexyl isocyanate), and (c) aliphatic diol containing from 4 to 8 carbon atoms, the mole ratio of (c) to (a) being from about 1.5;
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19. An optically-clear, energy-absorbing laminate, comprising at least one glass sheet bonded to a sheet of a substantially unreacted isocyanate free, thermoplastic, transparent polyesterurethane that is the reaction product of (a) essentially linear poly(epsilon caprolactone) diol having a molecular weight of between about 1000 and about 2000 and a liquidus temperature of at least 44°
- C., (b) 4,4'"'"'-methylene-bis(cyclohexyl isocyanate), and (c) aliphatic diol containing from 4 to 8 carbon atoms, the mole ratio of (c) to (a) being from about 0.4;
1 to about 5;
1, the isocyanate groups provided by (b) being substantially numerically equivalent to the hydroxyl groups provided by (a) and (c) whereby to provide a polyesterurethane that is substantially free of unreacted isocyanate groups, said mole ratio of (c) to (a) being so proportioned within said range that a rigidly held laminate prepared from about 0.030 inch sheeting of said polyesterurethane sandwiched between two 12" ×
12" ×
1/8 inch sheets of glass is non-brittle at 0°
F. and exhibits a mean penetration velocity of at least 20 miles per hour at laminate temperatures of 0°
F. and 70°
F., and a mean penetration velocity of at least 17 miles per hour at a laminate temperature of 120°
F. when impacted with a five pound free falling steel ball. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
- C., (b) 4,4'"'"'-methylene-bis(cyclohexyl isocyanate), and (c) aliphatic diol containing from 4 to 8 carbon atoms, the mole ratio of (c) to (a) being from about 0.4;
Specification