Polyphosphazene blends

Claim 2

A composition comprising a blend of at least one relatively elastomeric polyphosphazene copolymer having a Young's Modulus of in the range of 1×10 6 to 5×10 8 dyne/cm 2 and having randomly repeating units represented by the formulas ##STR6## wherein R 1 and R 2 are the same or different and are hydrogen, a C 1 -C 10 linear or branched alkyl radical, or a C 1 -C 4 linear or branched alkoxy, with the proviso that when R 2 is alkoxy, R 1 and R 2 are different; with at least one relatively stiff or rigid polyphosphazene homopolymer or copolymer having a Young's Modulus in the range of 5×10 8 to 6×10 10 dynes/cm 2 and having randomly repeating units represented by the formulas ##STR7## wherein R 1 and R 2 are the same or different and are hydrogen, a C 1 -C 10 linear or branched alkyl radical, or a C 1 -C 4 linear or branched alkoxy, said relatively elastomeric copolymer:relatively stiff or rigid homopolymer or copolymer being present in said blend in a ratio of from about 1:3 to about 3:1.

Claim 3

The polymer blend of claim 1, wherein at least one of said relatively elastomeric copolymer and said relatively stiff or rigid homopolymer or copolymer comprises additional randomly distributed repeating units represented by the formulas ##STR8## wherein W represents a monovalent radical containing a group capable of a crosslinking chemical reaction at moderate temperatures, said group being attached to a P atom by a --O-- linkage; the ratio of (OC 6 H 4 --R 1 ) : (OC 6 H 4 --R 2 ) being from about 1:6 to about 6:1; and the ratio of W: OC 6 H 4 --R 1 ) + (OC 6 H 4 --R 2 )! being less than about 1:5.

Claim 4

A composition comprising a blend of a relatively elastomeric first polymer having the general formula NP(OC.sub.6 H.sub.4 --R.sub.1).sub.a (OC.sub.6 H.sub.4 --R.sub.2).sub.b (W).sub.c !.sub.n wherein R 1 and R 2 are the same or different and are individually hydrogen, C 1 -C 10 linear or branched alkyl or C 1 -C 4 linear or branched alkoxy, with the proviso that when R 2 is alkoxy, R 1 and R 2 are different; W represents a monovalent radical containing a group capable of a cross-linking chemical reaction at moderate temperatures, said group being attached to a P atom by a --O-- linkage; n is from 20 to 2000; c≧o; a+b+c=2; the ratio of a:b is from about 1:6 to 6:1; the ratio of c:(a+b) is less than about 1:5; and the Young's Modulus of said first polymer is in the range of 1×10 6 to 5×10 8 dynes/cm 2 ; with a relatively stiff or rigid second polymer having the general formula NP(OC.sub.6 H.sub.4 --R.sub.1).sub.a (OC.sub.6 H.sub.4 --R.sub.2).sub.b (W).sub.c !.sub.n wherein R 1 and R 2 are the same or different and are individually hydrogen, C 1 -C 10 linear or branched alkyl or C 1 -C 4 linear or branched alkoxy; W represents a monovalent radical containing a group capable of a cross-linking chemical reaction at moderate temperatures, said group being attached to a P atom by a --O-- linkage; n is from 20 to 2000; c≧o; a+b+c=1; the ratio of a:b is from about 1:6 to 6:1; the ratio of c:(a+b) is less than about 1:5; and the Young's Modulus of said second polymer is in the range of 5×10 8 to 6×10 10 dynes/cm 2 ; the ratio of said first polymer to said second polymer ranging from about 1:3 to about 3:1.

Claim 5

A composition comprising a blend of a relatively elastomeric first polymer having the general formula NP(OC.sub.6 H.sub.4 --R.sub.1).sub.a (OC.sub.6 H.sub.4 --R.sub.2).sub.b (W).sub.c !.sub.n wherein R 1 and R 2 are the same or different and are individually hydrogen, C 1 -C 10 linear or branched alkyl or C 1 -C 4 linear or branched alkoxy, with the proviso that when R 2 is alkoxy, R 1 and R 2 are different; W represents a monovalent radical containing a group capable of a cross-linking chemical reaction at moderate temperatures, said group being attached to a P atom by a --O-- linkage; n is from 20 to 2000; c≧o; a+b+c=2; the ratio of a:b is from about 1:6 to 6:1; the ratio of c:(a+b) is less than about 1:5; and the Young's Modulus of said first polymer is in the range of 1×10 6 to 5×10 8 dynes/cm 2 ; with a relatively stiff or rigid second polymer having the general formula NP(OC.sub.6 H.sub.4 --R.sub.1).sub.a (OC.sub.6 H.sub.4 --R.sub.2).sub.b (W).sub.c !.sub.n wherein R 1 and R 2 are the same or different and are individually hydrogen, C 1 -C 10 linear or branched alkyl or C 1 -C 4 linear or branched alkoxy; W represents a monovalent radical containing a group capable of a cross-linking chemical reaction at moderate temperatures, said group being attached to a P atom by a --O-- linkage; n is from 20 to 2000; c≧o; a+b+c=1; the ratio of a:b is from about 1:6 to 6:1; the ratio of c:(a+b) is less than about 1:5; and the Young's Modulus of said second polymer is in the range of 5×10 8 to 6×10 10 dynes/cm 2 ; the ratio of said first polymer to said second polymer ranging from about 1:3 to about 3:1.

Claim 6

The blend of claim l3 wherein c=o.

Claim 7

The blend of claim 3 wherein c=o and the ratio of a:b is from 1:4 to 4:1.