Abstract: The invention relates to liquid stable MDI prepolymers and curative systems which are suitable for room temperature casting and which yield high performance low-shrinkage urethane elastomers upon room-temperature curing, the prepolymer and curative components, the elastomers themselves, and separately packaged prepolymer component and its complementary curative component provided as a single unit or kit.

Abstract: The invention relates to liquid stable MDI prepolymers and curative systems which are suitable for room temperature casting and which yield high performance low-shrinkage urethane elastomers upon room-temperature curing, the prepolymer and curative components, the elastomers themselves, and separately packaged prepolymer component and its complementary curative component provided as a single unit or kit.

Abstract: A combination of an apparatus or an extrusion for lengthwise movement of the elongate metal extrusion. The extrusion having therein a lengthwise cavity which has a central portion and two pockets disposed on opposite sides of and opening into the central portion. The apparatus has a tool disposed in the cavity and supported for eccentric rotation about an axis extending perpendicular to the direction of movement of the extrusion, the tool having abrading points which are spaced angularly about its centerline and which engage and physically roughen a surface in one of the pockets. The degree of eccentricity is adjustable. In a variation, the apparatus effects movement of a first member having two pegs which engage angled slots in a second member supporting a tool in the extrusion cavity, the tool being moved rectilinearly into and out of engagement with the extrusion surface in a manner physically roughening the surface.

Abstract: Polyurethane-urea polymers comprising inter-reacted isocyanate A), diol or polyol components B) and C), chain-extending glycol component D), polyester diol or polyol component E), and polyamine component F) using a polyurethane catalyst G) and an optional drying agent, each component having the further characteristics set forth in the Specification and each component being present in the relative proportions by weight as set forth in the Specification, have improved characteristics including a reduced flow time and diminished end-waste characteristics which obviate the necessity of taping a channel in a metal extrusion into which such polymers are poured to provide a thermal barrier in the bridged or debridged channel and are accordingly advantageously employed as thermal barriers in such structures.

Abstract: A castable thermosetting polyurethane polymer, having improved heat-stability characteristics, comprising (A) a polymeric methylene diisocyanate, (B) a propyleneoxide-extended polyol which is preferably a sugar-based polyol, (C) a polyether diol or triol, and (D) dipropylene glycol or diethylene glycol, in amounts respectively between about 35-45 parts by weight, 35-45 parts by weight, and 12-20 parts by weight, per 100 parts by weight of total diol and triol (resin) components, providing an NCO/OH ratio between about 1:1 and about 1.2:1, an effective polyurethane-catalyzing amount of (E) a urethane catalyst, and optionally comprising an effective amount of a drying agent, is disclosed. The cast polyurethane polymer of the invention withstands temperatures of 450.degree. F. (232.degree. C.) for 20 minutes without visual polymer degradation, whereas most other castable polyurethane systems degrade between 350.degree. F. and 375.degree. F.