Abstract: A polythioether is provided of the formula wherein R1 is H, C1-6 alkyl, C1-6 alkyl alcohol, C1-6 alkyl substituted with at least one of: —NHR5 wherein R5 is a C1-6 alkyl, R2 is C2-6 alkyl, C6-8 cycloalkyl, C6-10 alkylcycloalkyl, —[—(CH2)r—Q—]s—(CH2)t—, or C1-2 alkyl substituted forms thereof, wherein r is an integer value from 2 to 8, Q is a heteroatom selected from the group consisting of: O, S, —NH— and —NCH3—, s is an integer value from 1 to 5, and t is an integer value from 2 to 10, R3 is H or C1-4 alkyl, R4 is —CH2— or R2, M is a C1-10 alkyl, C6-20 aryl, C6-20 aryl substituted with at least one C1-8 alkyl group, or a N or O heteroatom, Y is C2-20 alkyl, C6-20 cycloalkyl, C6-10 alkylcycloalkyl, or —[—(CH2)r—Q—]s(—CH2—)t—, n is an integer value from 1 to 60, m is an integer value from 1 to 60, and p is an integer value from 1 to 10,

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.

Abstract: A curable sealant compound comprising: a polythiol; a cyclopolyene having a formula: where X is C1-5 aliphatic, Y is a C1-6 aliphatic, R2 is in each occurrence H, C1-C10 alkyl, C2-C10 alkenyl, Q—R3 where Q is O or S and R3 is C2-10 alkenyl, such that the cyclopolyene has non-conjugated carbon—carbon unsaturated bonds, and in formula (VII) there is one non-conjugated carbon—carbon unsaturated bond within the ring that is non-conjugated to other carbon—carbon unsaturated bonds; and an effective amount of a free radical catalyst.

Abstract: Sealant and potting formulations are provided which includes ungelled polymer(s) prepared from components including polyvinyl ether monomer(s) and polythiol material(s), the ungelled polymer being terminated with functional groups other than a thiol group; curing agent(s); and at least one additive selected from the group consisting of fillers, adhesion promoters, plasticizers and catalysts.

Abstract: A curable sealant compound comprising: a polythiol; a cyclopolyene having a formula: 1

Abstract: A polythioether is provided of the formula 1

Abstract: A polythioether comprising:

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.

Abstract: Sealant and potting formulations are provided which includes ungelled polymer(s) prepared from components including polyvinyl ether monomer(s) and polythiol material(s), the ungelled polymer being terminated with functional groups other than a thiol group; curing agent(s); and at least one additive selected from the group consisting of fillers, adhesion promoters, plasticizers and catalysts.

Abstract: A digital controlling system for fiber optic vortex shedding flowmeters which provides a new and improved preamp circuit and a computer for correcting temperature, linearity and hysteresis effects. The controlling system overcomes the inherent non-linearity of the vortex shedding phenomena and also provides two-way communication between a central control unit and the fiber optic vortex shedding flowmeter. The improved preamp circuitry increases the low-end range of fiber optic vortex shedding flowmeters.