The Upjohn Co.

Pat L Murray

Thomas R McClellan

Charles E Koehler

John N Curtiss

James H Ewen, Jr

Michael H McMillin

An apparatus is disclosed for the continuous dispensing and blending of a fluid material with a particulate material in predetermined quantities. A master control is provided for synchronizing the startup and interruption of the systems for furnishing the particulate material and the fluid material and for operation of the blending apparatus, thereby facilitating the continuous operation thereof. The system is particularly adapted for use in the coating of wood furnish with binder adhesive prior to the pressing and heating of the wood furnish to form particle boards and the like.

Apparatus for coating particulate material

The use of certain prepolymers of 4,4'-methylenebis(phenyl isocyanate), in place of the latter diisocyanate itself in the preparation of polyurethane-polyureas using aromatic diamine extenders, has a number of advantages particularly when the compositions are prepared by reaction injection molding techniques using two streams of reactants. The principal advantages are (i) a useful increase in gel time and (ii) a ratio of amounts of the two reactant streams which more nearly approaches 1:1. This latter factor not only improves the efficiency of mixing of the components in the mixing head but, together with the longer gel time, significantly increases the output of mixed reactants per unit of time. The prepolymers of 4,4'-methylenebis(phenyl isocyanate) employed to achieve the above results are those derived from polyoxyethylene polyoxypropylene polyether diols and triols (MW=1000-10,000), polytetramethylene glycols (MW=600-5,000) and polyester diols and triols (MW=500-8,000).

Polyurea-polyurethane from a mixture of a polyol, an aromatic diamine,

Disclosed are novel polyol blends comprising from about 20 percent to about 85 percent by weight of said blend of an amine diol, or mixture of amine diols selected from the formula ##STR1## wherein R is an aliphatic radical having from 8 to 18 carbon atoms, inclusive, each R.sub.1 is independently selected from the group consisting of hydrogen or methyl, x and y each independently have an average value from about 4 to about 15 inclusive; and from about 15 percent to about 80 percent by weight of a primary hydroxyl polyol characterized by a molecular weight of from about 60 to about 1000. The polyol blends are miscible with fluorocarbon blowing agents and water and other adjuvants including trimerization catalysts. The novel blends are particularly useful in an improved process for the preparation of polyisocyanurate foams. The foams are characterized by high reaction exotherms making such foams particularly suited to the preparation of polyisocyanurate foam laminates.

Novel process and product

Disclosed are novel polyol blends comprising from about 20 percent to about 85 percent by weight of said blend of an amine triol, or mixture of amine triols selected from the formula ##STR1## wherein R is an aliphatic radical having from 8 to 18 carbon atoms, inclusive, each R.sub.1 is independently selected from the group consisting of hydrogen or methyl, x, y, and z each independently have an average value from about 1 to about 5 inclusive, n is 2 or 3; and from about 15 percent to about 80 percent by weight of a primary hydroxyl polyol characterized by a molecular weight of from about 60 to about 1000. The polyol blends are miscible with fluorocarbon blowing agents and water and other adjuvants including trimerization catalysts. The novel blends are particularly useful in an improved process for the preparation of polyisocyanurate foams. The foams are characterized by high reaction exotherms making such foams particularly suited to the preparation of polyisocyanurate foam laminates.

Polyol-fluorocarbon-aminetriol blend and polyisocyanurate foams therefore

Process for polyisocyanurate foams suitable for panels

Disclosed are novel polyol blends comprising from about 20 percent to about 85 percent by weight of said blend of an amide diol, or mixture of amide diols selected from the formula ##STR1## wherein R is an aliphatic radical having from 7 to 17 carbon atoms, inclusive, each R.sub.1 is independently selected from the group consisting of hydrogen or methyl, x and y each independently have an average value from about 1 to about 3 inclusive; and from about 15 percent to about 80 percent by weight of a primary hydroxyl polyol characterized by a molecular weight of from about 60 to about 1000. The polyol blends are miscible with fluorocarbon blowing agents and water and other adjuvants including trimerization catalysts. The novel blends are particularly useful in an improved process for the preparation of polyisocyanurate foams. The foams are characterized by high reaction exotherms making such foams particularly suited to the preparation of polyisocyanurate foam laminates.

Process for polyisocyanurate foams based on an amide-diol blend

A mold is described for the molding of substantially isotropic isocyanate-based polymer foam buns. The mold is a box mold which has sidewalls of which at least one pair disposed in parallel relationship is adapted to move outwardly when subjected to pressure exerted by the expanding foam during the molding operation. The outward movement of the sidewalls is controlled by stops provided on the periphery of the mold floor, said sidewalls being free to slide over the surface of the floor. The lid of the mold is supported in sliding engagement with the upper edges of the sidewalls. The mold and the process of fabricating foam buns therewith is particularly suitable for use in situations (e.g. operation in the field) in which it is not possible or practicable to employ continuous bunstock machines. The mold is relatively inexpensive and readily dismantled for transportation to a fabrication site.

Growing community of inventors

Houston, TX, United States of America

Pat L Murray