Abstract: A curable thiol-ene composition specially adapted for use as a primary coating on optical fibers comprises a polythiol and a compound having a plurality of norbornene groups thereon, are characterized in that one of either the compound having the plurality of norbornene groups or the polythiol has a backbone of a poly(tetramethylene oxide), or is an oligomer thereof, and the poly(tetramethylene oxide) has a molecular weight of between 250 and 5,000. The formulations are relatively low viscosity liquids at practical application temperatures and cure substantially completely with very low irradiation fluence. The formulations cure in ambient air. There is no need to exclude oxygen or to control humidity. The formulations of the invention can be cured using low intensity UV lamps which do not generate significant amounts of heat. The cured products have excellent low temperature flexibility, good humidity and water absorbtion resistance and good thermal oxidative stability.

Abstract: A curable thiol-ene composition specially adapted for use as a primary coating on optical fibers comprises a polythiol and a compound having a plurality of norbornene groups thereon, are characterized in that one of either the compound having the plurality of norbornene groups or the polythiol has a backbone of a poly(tetramethylene oxide), or is an oligomer thereof, and the poly(tetramethylene oxide) has a molecular weight of between 250 and 5,000. The formulations are relatively low viscosity liquids at practical application temperatures and cure substantially completely with very low irradiation fluence. The formulations cure in ambient air. There is no need to exclude oxygen or to control humidity. The formulations of the invention can be cured using low intensity UV lamps which do not generate significant amounts of heat. The cured products have excellent low temperature flexibility, good humidity and water absorbtion resistance and good thermal oxidative stability.

Abstract: A process for the preparation of molded high strength composites comprising fibrous reinforcing material impregnated with a reaction injection molded polyisocyanurate resin. The process comprises first evacuating a mold containing the fibrous reinforcing material said mold equipped with means for accepting an overflow volume of the resin. The mold system is pressurized prior to gelation causing the overflow volume to be forced into a final volume. The molded composites have a high flexural moduli, good physical properties, low void content and smooth surface.

Abstract: Disclosed are novel polymer/polyisocyanate compositions. The compositions are prepared by the in-situ polymerization of at least one ethylenically unsaturated monomer in an organic polyisocyanate and in the presence of an adduct formed from the reaction of an excess of a carbodiimide-free polyisocyanate and a hydroxyl containing ethylenically unsaturated monomer.The graft polyisocyanates find particular utility in the making of molded polyurethane resins.

Abstract: Polyurethane-polyurea polymers are disclosed that are derived from the reaction injection molding of organic polyisocyanates, optional high molecular weight active hydrogen containing compounds and extender mixtures comprising (i) aromatic diamines wherein at least one of the positions ortho to each amine group is substituted by a lower alkyl group and (ii) bis(hydroxyalkyl)cycloalkanes. The improved polymers have excellent resistance to high temperature conditions.

Abstract: Polyamide-polyurea containing polymers are disclosed that are derived from the reaction of (A) an organic polyisocyanate; (B) an organic compound having at least two active hydrogen containing groups; and (C) about 15 to about 160 parts per 100 parts of said (B) of a chain extender combination comprising (i) a particular enamine and (ii) an aromatic diamine and optionally (iii) an extender diol wherein the ratio of equivalents of (A) to total equivalents of (B) and (C) is within the range of about 0.90:1 to 1.10:1.The polymers find particular utility in the preparation of RIM parts having excellent physical properties. At the same time, the polymers are characterized by slower gel times than prior art aromatic diamine extended polymers thereby allowing the filling of larger molded parts.

Abstract: An improved process for the reaction injection molding of high flexural modulus polyurea containing elastomers is disclosed. Elastomers of this type when prepared at the prior art molding temperatures are brittle and can shatter like glass while still in the mold. The same elastomers when molded at a temperature of from about 90.degree. to about 220.degree. C. are not at all brittle. These elastomers are also characterized by the other advantageous properties inherent in polyurea elastomers such as high tensile strength, high hardness, and good heat resistance.The improved RIM process finds particular utility in the preparation of auto parts such as panels, engine hoods, and the like.

Abstract: Disclosed is an improved process for the production of organic polyisocyanate based molded polymers prepared from at least one organic polyisocyanate and at least one polyol in the presence of an internal release agent wherein the improvement comprises employing as said agent a polysiloxane having at least one unit of the formula ##STR1## wherein R is selected from the group consisting of lower-alkyl and aryl, R.sup.1 is a divalent hydrocarbon radical, and R.sup.2 is selected from the group consisting of lower-alkoxy, aryloxy, particular hydroxyalkyleneoxy, alkoxyalkyleneoxy, amino, and hydroxyalkylamino radicals.The molding process can be repeated in many cycles before the molds require cleaning or treatment with release agent. The ease and rapidity with which the present process can be carried out makes it particularly suited to RIM production methods.

Abstract: Polyurethanes having a two phase morphology and characterized by high impact strength and, optionally, high modulus are obtained by reaction of 4,4'-methylenebis(phenyl isocyanate) and modified forms thereof with an aliphatic glycol extender and a blend of at least two polyoxypropylene-polyoxyethylene polyols both of which have average functionalities in the range of 2 to 4, one of which has a molecular weight in the range of about 3000 to 10,000 and contains at least 23 percent by weight of ethylene oxide residues and the other has a molecular weight in the range of about 750 to about 2000 and contains at least 45 percent by weight of ethylene oxide. The two or more such polyols are employed in proportions such that the aliphatic glycol extender is completely miscible with said polyols if blended together.

Abstract: Polyamide polyurethane polymers are disclosed that are derived from the reaction of (A) an organic polyisocyanate; (B) at least one organic polyol; and (C) a ketene-aminal having the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4, when taken separately, are independently selected from the group consisting of lower alkyl, aralkyl, and cycloalkyl and, when taken together as R.sub.1 with R.sub.2 and R.sub.3 with R.sub.4 with the respective nitrogen atoms to which they are attached, represent independently heterocyclic groups having from 5 to 7 ring atoms, wherein the equivalent proportions of said polyol component (B) to said ketene-aminal component (C) fall within the range of about 1:4 to about 1:80 and the ratio of equivalents of said isocyanate to total equivalents of isocyanate reactive ingredients (B) plus (C) is within the range of about 0.95:1 to 6:1.

Abstract: Novel polyketene-aminal polyamides are disclosed which have the following recurring unit ##STR1## wherein R is a divalent hydrocarbon radical, R.sub.1, R.sub.2, R.sub.3, and R.sub.4 when taken separately are independently selected from the group consisting of lower alkyl, aralkyl, and cycloalkyl, and when taken together as R.sub.1 with R.sub.2 and R.sub.3 with R.sub.4 with the respective nitrogen atoms to which they are attached represent independently a heterocyclic group having from 5 to 7 ring atoms.The polyamides are prepared by reacting together the appropriate diisocyanate [R(NCO).sub.2 ] and appropriate ketene-aminal to form the polymer directly without the evolution of any by-products or volatiles.The novel polymers are thermoplastic and can be formed or shaped using any of the techniques known to those skilled in the thermoplastic polymer art.

Abstract: Polyurethane polymers comprising the reaction product of an organic polyisocyanate (A), an organic polyol (B), & a difunctional extender (C) wherein the improvement comprises employing as the polyisocyanate (A) a composition comprising a bond of, (a) a prepolymer comprising the reaction product of methylenebis (phenyl isocyanate) with a polyol mixture comprising:(1) polyol having a molecular weight of at least 1,000, &(2) polyol having a molecular weight of about 115 to 300 & (b) a liquefied methylenebis (phenyl isocyanate). Also disclosed are blends of (a) & (b).

Abstract: A process is described for converting organic polyisocyanates to carbodiimide-containing polyisocyanates by heating said organic polyisocyanates in the presence of an organoarsine-substituted polystyrene carbodiimide-forming catalyst until a desired level of conversion is achieved, followed by separation of catalyst from product. It is thus possible to obtain a carbodiimide-containing polyisocyanate which is free from catalyst and hence free from the possibility that carbodiimide formation can continue on storage of the product. In a particular embodiment the process is employed to convert methylenebis(phenyl isocyanate), which is normally solid at ambient temperatures, to a storage stable liquid product. The polymeric catalysts employed in the process are characterized by a recurring unit of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are hydrocarbyl, R.sub.3 is hydrogen, chloro or methyl, R.sub.4 is hydrogen or methyl and n is 0 or 1.