High adhesion plugging and encapsulating polyurethane prepared from a polyol, a tri or tetra functional aliphatic polyol and a monofunctional aliphatic alcohol

Claim 2

A dielectric, thermally stable, hydrolytically stable, moisture-insensitive polyurethane resin comprising the reaction product of an admixture of: (a) from about 15 to about 45 percent by weight of said admixture of at least one isocyanate compound having at least about 2.0 NCO groups per molecule and selected from the group consisting of aliphatic and cycloaliphatic isocyanate compounds having a molecular weight of less than about 1,000; (b) from about 30 to about 70 percent by weight of said admixture of at least one polyol having an average molecular weight of at least about 500 to about 3,000 and containing at least about 2.0 predominantly terminal hydroxyl groups per molecule; (c) from about 5 to about 20 percent by weight of said admixture of a tri or tetra functional aliphatic polyol having a molecular weight of about 100 to about 700; (d) from about 3 to about 30 percent of a monofunctional aliphatic alcohol having 3 to 100 carbon atoms; and (e) up to about 5 percent by weight of said admixture of at least one catalyst capable of promoting a reaction between said isocyanate compound and said polyol and monofunctional alcohol compounds; wherein said isocyanate compound is present in sufficient quantity to provide an NCO/OH ratio of from about 0.9 to 1.1 in said admixture.

Claim 3

The resin according to claim 1 wherein said polyol of paragraph (b) is aliphatic.

Claim 4

The resin according to claim 1 wherein said polyol of paragraph (b) is a polyalkadiene polyol.

Claim 5

The resin according to claim 1 wherein said monofunctional alcohol has 3 to 30 carbon atoms.

Claim 6

The resin according to claim 1 wherein said isocyanate compound is isophorone diisocyanate.

Claim 7

The resin according to claim 1 wherein said catalyst is an organotin catalyst system.

Claim 8

A process for filling a cable splice closure between cables with a dielectric, thermally stable, hydrolytically stable, moisture-insensitive polyurethane resin, comprising the steps of: (a) pouring into a suitable mold surrounding said splice closure the reaction product of an admixture comprising: (1) from about 15 to about 45 percent by weight of said admixture of at least one isocyanate compound having at least about 2.0 NCO groups per molecule and selected from the group consisting of aliphatic and cycloaliphatic isocyanate compounds having a molecular weight of less than about 1,000; (2) from about 30 to about 70 percent by weight of said admixture of at least one polyol having an average molecular weight of at least about 500 to about 3,000 and containing at least about 2.0 predominantly terminal hydroxyl groups per molecule; (3) from about 3 to about 20 percent by weight of said admixture of a tri or tetra functional aliphatic polyol having a molecular weight of about 100 to about 700; (4) from about 3 to about 30 percent of a monofunctional aliphatic alcohol having 3 to 100 carbon atoms; and (5) up to about 5 percent by weight of said admixture of at least one catalyst capable of promoting a reaction between said isocyanate compound and said polyol and monofunctional alcohol compounds; wherein said isocyanate compound is present in sufficient quantity to provide an NCO/OH ratio of from about 0.9 to 1.1 in said admixture, and (b) curing said admixture.

Claim 9

A process for filling a cable splice closure between cables with a dielectric, thermally stable, hydrolytically stable, moisture-insensitive polyurethane resin, comprising the steps of: (a) pouring into a suitable mold surrounding said splice closure the reaction product of an admixture comprising: (1) from about 15 to about 45 percent by weight of said admixture of at least one isocyanate compound having at least about 2.0 NCO groups per molecule and selected from the group consisting of aliphatic and cycloaliphatic isocyanate compounds having a molecular weight of less than about 1,000; (2) from about 30 to about 70 percent by weight of said admixture of at least one polyol having an average molecular weight of at least about 500 to about 3,000 and containing at least about 2.0 predominantly terminal hydroxyl groups per molecule; (3) from about 3 to about 20 percent by weight of said admixture of a tri or tetra functional aliphatic polyol having a molecular weight of about 100 to about 700; (4) from about 3 to about 30 percent of a monofunctional aliphatic alcohol having 3 to 100 carbon atoms; and (5) up to about 5 percent by weight of said admixture of at least one catalyst capable of promoting a reaction between said isocyanate compound and said polyol and monofunctional alcohol compounds; wherein said isocyanate compound is present in sufficient quantity to provide an NCO/OH ratio of from about 0.9 to 1.1 in said admixture, and (b) curing said admixture.

Claim 10

A process according to claim 7 wherein said curing takes place at ambient conditions.

Claim 11

A process according to claim 7 wherein said curing takes place at temperatures up to 70° C.

Claim 12

A communication cable splice closure filled per the process of claim 7.

Claim 13

A two-part composition disposed in a single unitary package with the parts of the composition stored in separate compartments within the package and adapted upon mixing for use in the blocking or splicing of communication cable, the composition comprising, based on total polymer solids: (1) in one part (a) from about 15 to about 45 percent by weight of said admixture of at least one isocyanate compound having at least about 2.0 NCO groups per molecule and selected from the group consisting of aliphatic and cycloaliphatic isocyanate compounds having a molecular weight of less than about 1,000; and (2) in a second part (b) from about 30 to about 70 percent by weight of said admixture of at least one polyol, having an average molecular weight of about 500 to about 3,000 and containing at least about 2.0 predominantly terminal hydroxyl groups per molecule; (c) from about 5 to about 20 percent by weight of said admixture of a tri or tetra functional aliphatic polyol having a molecular weight of about 100 to 700; (d) from about 3 to about 30 percent of a mono-functional aliphatic alcohol having 3 to 100 carbon atoms; and (e) up to about 5 percent by weight of said admixture of at least one catalyst capable of promoting a reaction between said isocyanate compound and said polyols and monofunctional alcohol compounds; wherein said isocyanate compound is present in sufficient quantity to provide an NCO/OH ratio of from about 0.9 to 1.1 in said admixture.

Claim 14

A two-part composition disposed in a single unitary package with the parts of the composition stored in separate compartments within the package and adapted upon mixing for use in the blocking or splicing of communication cable, the composition comprising, based on total polymer solids: (1) in one part (a) from about 15 to about 45 percent by weight of said admixture of at least one isocyanate compound having at least about 2.0 NCO groups per molecule and selected from the group consisting of aliphatic and cycloaliphatic isocyanate compounds having a molecular weight of less than about 1,000; and (2) in a second part (b) from about 30 to about 70 percent by weight of said admixture of at least one polyol, having an average molecular weight of about 500 to about 3,000 and containing at least about 2.0 predominantly terminal hydroxyl groups per molecule; (c) from about 5 to about 20 percent by weight of said admixture of a tri or tetra functional aliphatic polyol having a molecular weight of about 100 to 700; (d) from about 3 to about 30 percent of a mono-functional aliphatic alcohol having 3 to 100 carbon atoms; and (e) up to about 5 percent by weight of said admixture of at least one catalyst capable of promoting a reaction between said isocyanate compound and said polyols and monofunctional alcohol compounds; wherein said isocyanate compound is present in sufficient quantity to provide an NCO/OH ratio of from about 0.9 to 1.1 in said admixture.

Claim 15

The composition according to claim 11 wherein said polyol of paragraph (b) is aliphatic.

Claim 16

The composition according to claim 11 wherein said polyol of paragraph (b) is a polyalkadiene polyol.

Claim 17

The composition according to claim 11 wherein said monofunctional alcohol has 3 to 30 carbon atoms.

Claim 18

The composition according to claim 11 wherein said isocyanate compound is isophorone diisocyanate.

Claim 19

The composition according to claim 11 wherein said catalyst is an organotin catalyst system.

Claim 20

The composition according to claim 11 wherein in said part one, said isocyanate compound (a) is prereacted with a portion of one or both of said polyol compounds (b) and (c), to form an isocyanate-terminated prepolymer.