Process for increasing flame resistance of nylon and resulting flame resistant nylon composition

Claim 2

A COMPOSITION COMPRISING NYLON AND FROM ABOUT 0.5 TO ABOUT 25 WEIGHT PERCENT OF A COMPOUND OF THE FORMULA

Claim 3

The compositions according to claim 1 wherein R2 is selected from

Claim 4

The compositions according to claim 1 wherein R1 is selected from -SH; -NR3R4 wherein R3 and R4 are each independently hydrogen or methyl;

Claim 5

The composition according to claim 3 wherein Q is a heterocyclic ring containing nitrogen.

Claim 6

The composition according to claim 4 wherein Q is a heterocyclic ring containing both sulfur and nitrogen.

Claim 7

The composition according to claim 3 wherein Q is a six membered ring.

Claim 8

The composition according to claim 6 wherein Q contains a nitrogen atom in the ring.

Claim 9

The composition according to claim 7 wherein Q contains both nitrogen and a sulfur atom in the ring.

Claim 10

The composition according to claim 7 wherein Q is an azine ring.

Claim 11

The composition according to claim 7 wherein Q is a diazine ring.

Claim 12

The composition according to claim 7 wherein Q is a triazine ring.

Claim 13

The composition according to claim 7 wherein Q is a tetrazine ring.

Claim 14

The composition according to claim 7 wherein Q is a pentazine ring.

Claim 15

The composition according to claim 8 wherein Q is a thiatriazine ring.

Claim 16

The composition according to claim 8 wherein Q is a dithiadiazine ring.

Claim 17

The composition according to claim 8 wherein Q is a dithiazine ring.

Claim 18

The composition according to claim 3 wherein m is O, Q contains from four to six atoms in the ring, at least one of which is a nitrogen atom and R1 is independently at each occurrence -SH, -NH2, -SM or a carbon and sulfur containing radical.

Claim 19

The composition of claim 17 wherein the nitrogen containing ring is a triazine.

Claim 20

The composition of claim 17 wherein the nitrogen containing ring is a thiadiazole.

Claim 21

The composition of claim 17 wherein at least one R1 radical is -SH, or -SM and M is NH4, Li, or a complex ion of Ca or Mg.

Claim 22

The composition of claim 18 wherein at least one R1 radical is -SH.

Claim 23

A composition according to claim 17 wherein said compound has the formula:

Claim 24

The composition according to claim 22 wherein R3 is hydrogen.

Claim 25

The composition according to claim 3 wherein m is O, Q is a sulfur containing ring radical having from four to 6 atoms in the ring and at least one R1 radical contains nitrogen.

Claim 26

The composition according to claim 24 wherein at least one R1 radical is -NH2.

Claim 27

The composition according to claim 3 wherein at least one R2 radical is S.

Claim 28

The composition according to claim 26 wherein the compound is:

Claim 29

The composition according to claim 26 wherein the compound is:

Claim 30

The composition according to claim 26 wherein the compound is:

Claim 31

A process for forming a nylon composition having improved flame resistance comprising treating nylon with a compound of the formula (R1)n-Q (R2)m wherein Q is a heterocyclic ring structure which may be substituted or unsubstituted and contains at least one sulfur or nitrogen atom in the ring; R1 is independently at each occurrence a monovalent radical containing no more than 55 weight percent carbon and at least one sulfur or nitrogen atom; R2 is independently at each occurrence a divalent radical containing fewer than 10 atoms other than hydrogen and at least one sulfur or nitrogen atom; n is 0 or an integer of 1 through 6 and the sum of n and 2m is no greater than six with the proviso that said compound contains at least one nitrogen atom and at least one sulfur atom, contains no non-cyclic imine group and the ratio of the number of carbon atoms in the compound to the total number of atoms having an atomic weight number greater than two other than carbon in the compound being 2:1 or less, said compound including no carbon atom chain containing over six carbon atoms and being free of phosphorous, arsenic, halogens, and hexavalent sulfur which is directly bonded to a carbon atom.

Claim 32

A process for forming a nylon composition having improved flame resistance comprising treating nylon with a compound of the formula (R1)n-Q (R2)m wherein Q is a heterocyclic ring structure which may be substituted or unsubstituted and contains at least one sulfur or nitrogen atom in the ring; R1 is independently at each occurrence a monovalent radical containing no more than 55 weight percent carbon and at least one sulfur or nitrogen atom; R2 is independently at each occurrence a divalent radical containing fewer than 10 atoms other than hydrogen and at least one sulfur or nitrogen atom; n is 0 or an integer of 1 through 6 and the sum of n and 2m is no greater than six with the proviso that said compound contains at least one nitrogen atom and at least one sulfur atom, contains no non-cyclic imine group and the ratio of the number of carbon atoms in the compound to the total number of atoms having an atomic weight number greater than two other than carbon in the compound being 2:1 or less, said compound including no carbon atom chain containing over six carbon atoms and being free of phosphorous, arsenic, halogens, and hexavalent sulfur which is directly bonded to a carbon atom.

Claim 33

The process according to claim 30 wherein R2 is selected from S, and

Claim 34

The process according to claim 31 wherein R1 is selected from -SH; -NR3R4 wherein R3 and R4 are each independently at each occurrence hydrogen or methyl;

Claim 35

The process according to claim 32 wherein Q is a four to six membered heterocyclic ring containing nitrogen.

Claim 36

The process according to claim 33 wherein the compound is:

Claim 37

The process according to claim 33 wherein the compound is:

Claim 38

The process according to claim 33 wherein the compound is:

Claim 39

The process according to claim 30 wherein the nylon composition comprises nylon fiber.

Claim 40

A process according to claim 37 wherein the nylon fiber is treated by wetting the fiber with a solution of from about 0.5 to about 16 weight percent of compound.

Claim 41

A process according to claim 37 wherein said compound is stable in nylon melt and from about 0.5 to about 16 weight percent said compound is incorporated into the nylon prior to spinning.

Claim 42

A process according to claim 30 wherein the nylon is treated by incorporating from about 0.5 to about 8 weight percent of compound into the nylon polymerization reaction.

Claim 43

A process according to claim 30 wherein said compound is stable in nylon melt and the nylon is treated by incorporating from about 0.5 to about 16 weight percent of compound into the nylon prior to molding.