Method for production of modified oxymethylene polymers

Claim 2

The method of claim 2 wherein said coupling agent is a diisocyanate and is present at between from about 0.5 to about 3.0 moles of isocyano groups per mole of active hydrogen, defining one gram of active hydrogen as equal to one mole thereof, and said oxymethylene polymer is present at from about 20 to about 80 weight percent based upon the weight of the reactive components.

Claim 3

The method of claim 3 wherein said dissimilar organic polymer has a molecular weight of between about 1,000 and about 3,000 and a hydroxyl number of between about 30 and about 120, and said oxymethylene polymer is present at from about 40 to about 60 weight percent based upon the weight of the reactive components, and said diisocyanate is present at between from about 0.8 to about 1.2 moles of isocyano groups per mole of active hydrogen defining one gram of active hydrogen as equal to one mole thereof.

Claim 4

The method of claim 4 wherein said organic tin catalyst is selected from the group cOnsisting of stannous octoate and organic tin catalysts having from one to three carbon bonds directly to a given tin atom with one or more catalytically intensifying bonds from said tin atom to an atom selected from the group consisting of halogen, hydrogen, oxygen, sulfur, nitrogen or phosphorous and is present at from about 0.005 to about 0.015 weight percent based upon the weight of the reactive components, and wherein each R1, R2 and R3 of the organic phosphite is an alkyl substituted aryl group and said organic phosphite is added at up to about 1.2 weight percent based upon the weight of the reactive components.

Claim 5

The method of claim 5 wherein said organic tin catalyst is selected from the group consisting of stannous octoate and dibutyltin dilaurate, and wherein each alkyl substituted aryl group of said organic phosphite is selected from the group consisting of mono- and di- nonyl substituted phenyl and said organic phosphite is added at from about 0.25 to about 1.0 weight percent based upon the weight of the reactive components.

Claim 6

The method of claim 6 wherein said oxymethylene polymer is an oxymethylene homopolymer.

Claim 7

The method of claim 6 wherein said oxymethylene polymer is an oxymethylene copolymer comprising 85 percent to about 99.9 weight percent recurring -OCH2- groups interspersed with groups of the formula: wherein each R1 and R2 is selected from the group consisting of hydrogen, lower alkyl and halogen-substituted lower alkyl radicals each R3 is selected from the group consisting of methylene, oxymethylene, lower alkyl and haloalkyl-substituted methylene, and lower alkyl and haloalkyl-substituted oxymethylene radicals and n is an integer from zero to 3, inclusive, each lower alkyl radical having from one to two carbon atoms, inclusive, said -OCH2- groups consisting from 85 percent to 99.9 percent of the recurring units and said groups represented by the formula: being incorporated during the step of copolymerization to produce said copolymer by the opening up of the ring of a cyclic ether having adjacent carbon atoms by the breaking of an oxygen-to-carbon linkage, and said oxymethylene copolymer is present at from about 40 to about 60 weight percent based upon the total weight of the reactive components.

Claim 8

The method of claim 8 wherein said cyclic ether is represented by the formula: wherein n represents an integer from zero to 2.

Claim 9

The method of claim 9 wherein said dissimilar organic polymer is an hydroxyl polyester.

Claim 10

The method of claim 10 wherein said hydroxyl polyester is formed from a polycarboxylic acid selected from the group consisting of adipic acid and azelaic acid, and a polyhydric alcohol selected from the group consisting of 1,4 butanediol, 1,6 hexanediol and neopentyldiol, and wherein the water content is below from about 0.01 to about 0.04 weight percent based upon the weight of the reactive components.

Claim 11

The method of claim 11 wherein said diisocyanate is diphenyl methane 4,4''-diisocyanate.