Low oiling gel filled flexible articles and gels therefor

Claim 2

A gel filled flexible article comprising a flexible container having at least a portion of the container wall composed of silicone rubber which is less than 0.0015 meters thick and said silicone rubber comprising a gum which is essentially polydimethylsiloxane, said container containing silicone gel which at least contacts the container wall composed of silicone rubber, said gel has a penetration of from 10 to 60 millimeters and produces a linear swell of the silicone rubber when said silicone rubber is encapsulated in the gel for 21 days at room temperature of less than 5 percent, and said gel comprising a crosslinked essentially polydimethylsiloxane.

Claim 3

The gel filled flexible article in accordance with claim 1 in which all the container walls are silicone rubber.

Claim 4

The gel filled flexible article in accordance with claim 2 in which the crosslinked essentially polydimethylsiloxane is prepared from methylphenylvinylsiloxy endblocked polydimethylsiloxane which has an effective viscosity of 4.5 to 30 pascal-seconds at 25° C.

Claim 5

The gel filled flexible article in accordance with claim 3 in which the crosslinked essentially polydimethylsiloxane is a composition prepared by mixing a methylphenylvinylsiloxy endblocked polydimethylsiloxane having a viscosity of 0.1 to 6 pascal-seconds at 25° C., a sufficient amount of a dimethylhydrogensiloxy endblocked polydimethylsiloxane having a viscosity of less than 0.5 pascal-seconds at 25° C. to provide an effective viscosity for the methylphenylvinylsiloxy end-blocked polydimethylsiloxane of from 4.5 to 30 pascal-seconds at 25° C., a polymethylsiloxane having an average of at least three silicon-bonded hydrogen atoms per molecule present in an amount to provide a ratio of total silicon-bonded hydrogen atoms to vinyl radicals in the composition of from 0.2 to 0.8 and a catalytic amount of a compatible platinum catalyst.

Claim 6

The gel filled flexible article in accordance with claim 4 in which the gel has a penetration of 25 to 45 millimeters and is a composition prepared by mixing a methylphenylvinylsiloxy endblocked polydimethylsiloxane having a viscosity of from 1.5 to 3 pascal-seconds at 25° C., a sufficient amount of a dimethylhydrogensiloxy endblocked polydimethylsiloxane having a silicon-bonded hydrogen atom content of from 0.1 to 0.2 weight percent based on the weight of the dimethylhydrogensiloxy endblocked polydimethylsiloxane to provide an effective viscosity for the methylphenylvinylsiloxy endblocked polydimethylsiloxane of from 6 to 12 pascal-seconds at 25° C., a polymethylsiloxane composed of trimethylsiloxy units, dimethylsiloxane units and methylhydrogensiloxane units and having a silicon-bonded hydrogen atom content of from 0.5 to 1.0 weight percent based on the weight of the polymethylsiloxane and having a viscosity of less than 0.5 pascal-seconds at 25° C. and a catalytic amount of a compatible platinum catalyst.

Claim 7

The gel filled flexible article in accordance with claim 5 in which the silicone rubber comprises a cross-linked, reinforcing silica filled polydimethylsiloxane gum.

Claim 8

The gel filled flexible article in accordance with claim 1 which is an external breast prosthesis.

Claim 9

The gel filled flexible article in accordance with claim 6 which is an external breast prosthesis.

Claim 10

The gel filled flexible article in accordance with claim 7 in which the silicone rubber contains pigments simulating skin color.

Claim 11

The gel filled flexible article in accordance with claim 8 in which the silicone rubber contains pigments simulating skin color.

Claim 12

A silicone gel comprising a crosslinked essentially polydimethylsiloxane having a penetration of from 20 to 60 millimeters being prepared by mixing a methylphenylvinylsiloxy endblocked polydimethylsiloxane having a viscosity of 0.1 to 6 pascal-seconds at 25° C., a sufficient amount of a dimethylhydrogensiloxy endblocked polydimethylsiloxane having a viscosity of less than 5 pascal-seconds at 25° C. to provide an effective viscosity for the methylphenylvinylsiloxy endblocked polydimethylsiloxane of from 4.5 to 30 pascal-seconds at 25° C., a polymethylsiloxane having an average of at least three silicon-bonded hydrogen atoms per molecule present in an amount to provide a ratio of silicon-bonded hydrogen atoms to vinyl radicals in the total composition of from 0.3 to 0.74 and a catalytic amount of a compatible platinum catalyst, and thereafter curing the composition to obtain a gel.

Claim 13

A silicone gel comprising a crosslinked essentially polydimethylsiloxane having a penetration of from 20 to 60 millimeters being prepared by mixing a methylphenylvinylsiloxy endblocked polydimethylsiloxane having a viscosity of 0.1 to 6 pascal-seconds at 25° C., a sufficient amount of a dimethylhydrogensiloxy endblocked polydimethylsiloxane having a viscosity of less than 5 pascal-seconds at 25° C. to provide an effective viscosity for the methylphenylvinylsiloxy endblocked polydimethylsiloxane of from 4.5 to 30 pascal-seconds at 25° C., a polymethylsiloxane having an average of at least three silicon-bonded hydrogen atoms per molecule present in an amount to provide a ratio of silicon-bonded hydrogen atoms to vinyl radicals in the total composition of from 0.3 to 0.74 and a catalytic amount of a compatible platinum catalyst, and thereafter curing the composition to obtain a gel.

Claim 14

The silicone gel in accordance with claim 11 in which the gel has a penetration of 25 to 45 millimeters and is prepared by mixing a methylphenylvinylsiloxy endblocked polydimethylsiloxane having a visocisty of from 1.5 to 3 pascal-seconds at 25° C., a sufficient amount of a dimethylhydrogensiloxy endblocked polydimethylsiloxane having a silicon-bonded hydrogen atom content of from 0.1 to 0.2 weight percent based on the weight of the dimethylhydrogensiloxy endblocked polydimethylsiloxane to provide an effective viscosity for the methylphenylvinylsiloxy endblocked polydimethylsiloxane of from 6 to 12 pascal-seconds at 25° C., a polymethylsiloxane composed of trimethylsiloxy units, dimethylsiloxane units and methylhydrogensiloxane units and having a silicon-bonded hydrogen atom content of from 0.5 to 1.0 weight percent based on the weight of the polymethylsiloxane and having a viscosity of less than 0.5 pascal-seconds at 25° C., and a catalytic amount of a compatible platinum catalyst and thereafter curing the composition to obtain a gel.