Dry silicone gels and their methods of making

A method of making a dry silicone gel comprising:

• providing a first set of components comprising:
• (1) a vinyl-terminated polydimethylsiloxane having a molecular weight between 28,000 g/mol and 70,000 g/mol, a viscosity between 3,000 mm2/s and 7,000 mm2/s, and a vinyl content between 0.01 mmol/g and 0.1 mmol/g, and
• (2) an addition cure catalyst, wherein the catalyst is selected from the group consisting of platinum complexed with divinyltetramethyldisiloxane and rhodium chloride complex;
• providing a second set of components comprising:
• (1) a crosslinker selected from the group consisting of tetrakis(dimethylsiloxy)silane, methyltris(dimethylsiloxy)silane, and combinations thereof,
• (2) a chain extender selected from the group consisting of hydride containing polydimethylsiloxane, dihydride containing siloxane, hydride terminated polyphenylmethylsiloxane, hydride terminated polydiphenylsiloxane, functionalized terminated silicone, and combinations thereof,
• (3) an inhibitor, and
• (4) additional vinyl-terminated polydimethylsiloxane having a vinyl-terminated polydimethylsiloxane having a molecular weight between 28,000 g/mol and 70,000 g/mol, a viscosity between 3,000 mm2/s and 7,000 mm2/s, and a vinyl content between 0.01 mmol/g and 0.1 mmol/g;
• and
• mixing the first and second set of components together to form the dry silicone gel,
• wherein the dry silicone gel has a mole fraction of hydride present as crosslinker between 0.2 and 0.5, wherein the hydride to vinyl ratio in the dry silicone gel is between 0.8 and 1.0, and wherein the weight percent ratio between the first set of components and the second set of components is 1:1, and wherein the dry silicone gel has a hardness between 100 g and 300 g.

dry silicone gel prepared from a composition comprising:

• a base polymer having a vinyl-silicone group, wherein the base polymer is a vinyl-terminated polydimethylsiloxane having a molecular weight between 28,000 g/mol and 70,000 g/mol;
• a crosslinker having three or four Si-H groups;
• and
• a chain extender having two Si-H groups, wherein the dry silicone gel has a hardness between 100 g and 300 g, and a mole fraction of hydride present as crosslinker between 0.2 and 0.5.

A method of making a silicone gel comprising:

• providing a first set of components comprising:
• (1) a base polymer having a vinyl-silicone group, and (2) an addition cure catalyst;
• providing a second set of components comprising:
• (1) a crosslinker having three or four Si-H groups, (2) a chain extender having two Si-H groups, and (3) additional base polymer having a vinyl-silicone group;
• and
• mixing the first and second set of components together to form the silicone gel, wherein the silicone gel has a hardness between 100 g and 300 g, and a mole fraction of hydride present as crosslinker between 0.2 and 0.5, wherein the base polymer and additional base polymer are each a vinyl-terminated polydimethylsiloxane each having a molecular weight between 28,000 g/mol and 70,000 g/mol, and wherein the silicone gel exhibits less than 10% oil bleed out after being under compression of 1.2 atm for 200 hours at 60° C.

A method of making a silicone gel comprising:

• providing a first set of components comprising:
• (1) a vinyl-terminated polydimethylsiloxane having a molecular weight between 28,000 g/mol and 70,000 g/mol, a viscosity between 3,000 mm2/s and 7,000 mm2/s, and a vinyl content between 0.01 mmol/g and 0.1 mmol/g, and
• (2) an addition cure catalyst, wherein the catalyst is selected from the group consisting of platinum complexed with divinyltetramethyldisiloxane, cobalt carbonyl complex, and rhodium chloride complex;
• providing a second set of components comprising:
• (1) a crosslinker selected from the group consisting of tetrakis(dimethylsiloxy)silane, methyltris(dimethylsiloxy)silane, and combinations thereof,
• (2) a chain extender selected from the group consisting of hydride containing polydimethylsiloxane, dihydride containing siloxane, hydride terminated polyphenylmethylsiloxane, hydride terminated polydiphenylsiloxane, functionalized terminated silicone, and combinations thereof,
• (3) an inhibitor, and
• (4) additional vinyl-terminated polydimethylsiloxane having a vinyl-terminated polydimethylsiloxane having a molecular weight between 28,000 g/mol and 70,000 g/mol, a viscosity between 3,000 mm2/s and 7,000 mm2/s, and a vinyl content between 0.01 mmol/g and 0.1 mmol/g;
• and
• mixing the first and second set of components together to form the silicone gel,
• wherein the silicone gel has a mole fraction of hydride present as crosslinker between 0.2 and 0.5, wherein the hydride to vinyl ratio in the silicone gel is between 0.8 and 1.0, wherein the weight percent ratio between the first set of components and the second set of components is 1:1, wherein the silicone gel has a hardness between 100 g and 300 g, and wherein the silicone gel exhibits less than 10% oil bleed out after being under compression of 1.2 atm for 200 hours at 60° C.

A silicone gel prepared from a composition comprising:

• a base polymer having a vinyl-silicone group, wherein the base polymer is a vinyl-terminated polydimethylsiloxane having a molecular weight between 28,000 g/mol and 70,000 g/mol;
• a crosslinker having three or four Si-H groups;
• and
• a chain extender having two Si-H groups, wherein the silicone gel has a hardness between 100 g and 300 g, and a mole fraction of hydride present as crosslinker between 0.2 and 0.5, wherein the silicone gel exhibits less than 10% oil bleed out after being under compression of 1.2 atm for 200 hours at 60° C.