Sealants containing multimodal polymer blends
AssigneePBT Brands, Inc.
InventorsJonathan D. Zook, David W. Jordan, Dean M. Willard, George Jones, Michael Cosman
Life of this patent
Estimating the term…
Abstract
A blend of multimodal average molecular weight sulfur or ether linkage containing organic polymers provides sealants, potting compounds and moldable compositions with good physical properties. In the case of S-containing polythioether or polysulfide, these properties are well suited to the formulation of aerospace sealants even using standard lightweight filler technology. Sealants based upon this multimodal blend concept exhibit improved strength and toughness even when relatively large amounts of lightweight fillers are used. Multimodal polyurethanes and other ether linkage containing polymers also show enhanced physical properties.
Claims27
A composition comprising a multimodal polymer blend containing sulfur or ether linkages therein, said polymer blend having a ratio of between 2 and 4 for a maximal polymer mode average molecular weight and a minimal polymer mode average molecular weight wherein the minimum polymer mode average molecular weight is less than 1000 Daltons.
A composition comprising a multimodal sulfur containing polymer blend, said blend having a ratio of greater than 1.5 for a maximal polymer mode average molecular weight and a minimal polymer mode average molecular weight.
A composition comprising a multimodal polymer blend containing sulfur or ether linkages therein, said polymer blend having a ratio of between 2 and 4 for a maximal polymer mode average molecular weight and a minimal polymer mode average molecular weight wherein the minimum polymer mode average molecular weight is less than 1000 Daltons and the maximal polymer mode is no greater than 90 weight percent of the multimodal polymer blend, wherein when said multimodal blend contains only ether linkages that said blend is not uniformly terminated with hydroxyl groups.
A composition comprising a multimodal sulfur containing polymer blend, said blend having a ratio of between 1.5 and 9.0 for a maximal polymer mode average molecular weight and a minimal polymer mode average molecular weight and the maximal polymer mode is no greater than 90% of the multimodal polymer blend.
Dependencies are inferred from the claim text.