Andreas R. Schmidt - Reinach, CH Herbert F. Strohmayer - Allentown PA Walter Sibral - Tulln, AT Barton Milligan - Coplay PA
Assignee:
Lim International S.A.
International Classification:
B60C 900 B60C 100
US Classification:
152357A
Abstract:
This invention relates to reinforced tire utilizing polyurea or polyurethane formulations having low hysteresis. The polymer having low hysteresis is formed by reacting a prepolymer of an aromatic isocyanate and a high molecular weight difunctional polyol with a chain extender mix comprising an aromatic diamine and difunctional polyol. In these compositions the aromatic diisocyanate and aromatic diamine are selected so that there is substantial symmetry between the molecules. The reinforcement used is preferably an aromatic polyamide.
Bridge Bis(Cyclohexylamine) Curing Agents For Epoxy Resins
Herbert F. Strohmayer - Allentown PA Jeremiah P. Casey - Emmaus PA Peter A. Lucas - Allentown PA
Assignee:
Air Products and Chemicals, Inc. - Allentown PA
International Classification:
C08G 5950
US Classification:
528122
Abstract:
This invention relates to bridged cyclohexylamines represented by the formula: ##STR1## A is C. sub. 0, --CH. sub. 2 --, ##STR2## R. sub. 1 is C. sub. 1-3 alkyl R. sub. 2 is C. sub. 1-6 alkyl R. sub. 3 is C. sub. 1 or C. sub. 2 alkyl R. sub. 4 is H or C. sub. 1-4 alkyl x is 0 or 1 y is 0 or 1 These bridged bis(cyclohexylamine) derivatives are well suited as curing agents for epoxy resins. These compositions lead to enhanced processing of the epoxy resin and permit adjustment of the reactivity/performance in formulating epoxies which demonstrate superior high temperature properties.
Andreas R. Schmidt - Reinach, CH Herbert F. Strohmayer - Allentown PA Walter Sibral - Tulln, AT Barton Milligan - Coplay PA
Assignee:
Air Products and Chemicals, Inc. - Allentown PA
International Classification:
C08G 1810 C08G 1832
US Classification:
528 64
Abstract:
This invention pertains to the synthesis of polyurethane systems having low hysteresis. The systems are generated by reacting a prepolymer of a mononuclear diisocyanate and a polyol with a chain extender mix of a mononuclear aromatic diamine and a polyol. The prepolymer should have a free isocyanate content of from 2 to about 12% by weight and the chain extender mix should have an amine to polyol equivalent from about 0. 5 to 5:1.