Impact-resistant thermoplastic polyester urethanes
AssigneePPG Industries, Inc.
InventorsNelson V. Seeger, Andrew J. Kaman
Life of this patent
Estimating the term…
Abstract
Polyester urethanes having superior properties for use in safety glass windshields are formed from (a) a hydroxy-terminated polyester of polycaprolactone, poly(butylene adipate), poly(butylene azelate) or mixtures; (b) a diol having a molecular weight less than 250, preferably 1,4-butanediol or 1,3-butanediol and (c) a cycloaliphatic diisocyanate.
Claims16
A transparent, thermoplastic polyesterurethane that is the reaction product of (a) essentially linear hydroxy-terminated polyester selected from the group consisting of poly(1,4-butylene adipate) having a molecular weight of about 2000, poly(1,4-butylene azelate) having a molecular weight of from about 1000 to about 2000 and poly(epsilon caprolactone) having a molecular weight of from about 1000 to about 2000, (b) aliphatic diol of from 2 to 10 carbon atoms, and (c) 4,4'-methylene-bis(cyclohexyl isocyanate), the mole ratio of (b) to (a) ranging from about 0.9 to 1.2:1 for polyesters of about 1000 molecular weight to from about 0.7 to 5:1 for polyesters of about 2000 molecular weight, and the number of isocyanate groups provided by (c) being substantially equivalent to the total number of hydroxy groups provided by (a) and (b) whereby to provide a polyesterurethane that is substantially free of unreacted isocyanate groups.
A transparent, thermoplastic polyesterurethane that is the reaction product of (a) essentially linear, hydroxy-terminated polyester selected from the group consisting of poly(1,4-butylene azelate) and poly(epsilon caprolactone), said polyester having a molecular weight of about 1000, (b) aliphatic diol of from 2 to 10 carbon atoms, and (c) 4,4'-methylene-bis(cyclohexyl isocyanate), the mole ratio of (b) and (a) being from about 0.9 to 1.2:1 and the number of isocyanate groups provided by (c) being substantially equivalent to the total number of hydroxy groups provided by (a) and (b) whereby to provide a polyesterurethane that is substantially free of unreacted isocyanate groups.
A transparent, thermoplastic polyesterurethane that is the reaction product of (a) essentially linear hydroxy-terminated polyester selected from the group consisting of poly(1,4-butylene adipate) and poly(1,4-butylene azelate), said polyester having a molecular weight of about 2000, (b) aliphatic diol of from 2 to 10 carbon atoms, and (c) 4,4'-methylene-bis(cyclohexyl isocyanate), the mole ratio of (b) to (a) being from about 0.7 to 5:1 and the number of isocyanate groups provided by (c) being substantially equivalent to the total number of hydroxy groups provided by (a) and (b) whereby to provide a polyesterurethane that is substantially free of unreacted isocyanate groups.
Dependencies are inferred from the claim text.