Low density silicone foam
First Claim
Patent Images
1. A foamable composition comprising:
- (a) 100 parts by weight of a vinyl-containing polysiloxane of the formula;
##STR3## where R and R1 are selected from substituted or unsubstituted hydrocarbon radicals of from 1 to 20 carbon atoms, such that the polymer contains from 0.0002 to 3% by weight vinyl and x varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25°
C.;
(b) from 1 to 50 parts by weight of a hydride polysiloxane of the formula;
##STR4## where R2 is selected from the group consisting of independently, hydrogen, alkyl radicals of from 1 to 8 carbon atoms, aryl radicals of from 1 to 8 carbon atoms, haloalkyl radicals of 3 to 8 carbon atoms and simultaneously, a single --O-- to form a cyclic polymer and R3 is selected from the group consisting of alkyl radicals of from 1 to 8 carbon atoms, aryl radicals of from 1 to 8 carbon atoms, and fluoroalkyl radicals of 3 to 8 carbon atoms, where the hydride polysiloxane has a hydrogen content varying from 0.3 to 1.6% by weight and z and y vary such that the polymer has a viscosity varying from 1 to 500 centipoise at 25°
C.;
(c) a hydroxyl source selected from the group consisting of water, organic alcohol, hydroxylated siloxane, and combinations thereof in an amount to provide a molar ratio of from about 0.02/1 to about 5/1 of hydroxyl radicals to silicon-bonded hydrogen atoms of component (b);
(d) from about 1 to about 250 parts per million of platinum catalyst; and
(e) an amount of amine compound effective to lower foam density of the formula;
space="preserve" listing-type="equation">NR.sub.3.sup.4 wherein R4 is selected from the group consisting of hydrogen, hydroxy, substituted or unsubstituted alkyl of 1 to 18 carbon atoms substituted or unsubstituted aryl of 1 to 18 carbon atoms, and a substituted or unsubstituted silyl.
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Abstract
Amine compounds are added to foamable elastomeric silicone foam to reduce foam density.
28 Citations
40 Claims
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1. A foamable composition comprising:
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(a) 100 parts by weight of a vinyl-containing polysiloxane of the formula;
##STR3## where R and R1 are selected from substituted or unsubstituted hydrocarbon radicals of from 1 to 20 carbon atoms, such that the polymer contains from 0.0002 to 3% by weight vinyl and x varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25°
C.;(b) from 1 to 50 parts by weight of a hydride polysiloxane of the formula;
##STR4## where R2 is selected from the group consisting of independently, hydrogen, alkyl radicals of from 1 to 8 carbon atoms, aryl radicals of from 1 to 8 carbon atoms, haloalkyl radicals of 3 to 8 carbon atoms and simultaneously, a single --O-- to form a cyclic polymer and R3 is selected from the group consisting of alkyl radicals of from 1 to 8 carbon atoms, aryl radicals of from 1 to 8 carbon atoms, and fluoroalkyl radicals of 3 to 8 carbon atoms, where the hydride polysiloxane has a hydrogen content varying from 0.3 to 1.6% by weight and z and y vary such that the polymer has a viscosity varying from 1 to 500 centipoise at 25°
C.;(c) a hydroxyl source selected from the group consisting of water, organic alcohol, hydroxylated siloxane, and combinations thereof in an amount to provide a molar ratio of from about 0.02/1 to about 5/1 of hydroxyl radicals to silicon-bonded hydrogen atoms of component (b); (d) from about 1 to about 250 parts per million of platinum catalyst; and (e) an amount of amine compound effective to lower foam density of the formula;
space="preserve" listing-type="equation">NR.sub.3.sup.4wherein R4 is selected from the group consisting of hydrogen, hydroxy, substituted or unsubstituted alkyl of 1 to 18 carbon atoms substituted or unsubstituted aryl of 1 to 18 carbon atoms, and a substituted or unsubstituted silyl. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A silicone foam comprising the reaction product of:
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(a) 100 parts by weight of a vinyl-containing polysiloxane of the formula;
##STR5## where R and R1 are selected from substituted or unsubstituted hydrocarbon radicals of from 1 to 20 carbon atoms, such that the polymer contains from 0.0002 to 3% by weight vinyl and x varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25°
C.;(b) from 1 to 50 parts by weight of a hydride polysiloxane of the formula;
##STR6## where R2 is selected from the group consisting of, independently, hydrogen, alkyl radicals of from 1 to 8 carbon atoms, aryl radicals of from 1 to 8 carbon atoms, haloalkyl radicals of 3 to 8 carbon atoms and simultaneously, a single --O-- to form a cyclic polymer, and R3 is selected from the group consisting of alkyl radicals of from 1 to 8 carbon atoms, aryl radicals of from 1 to 8 carbon atoms, and fluoroalkyl radicals of 3 to 8 carbon atoms, where the hydride polysiloxane has a hydrogen content varying from 0.3 to 1.6% by weight and z and y vary such that the polymer has a viscosity varying from 1 to 500 centipoise at 25°
C.;(c) a hydroxyl source selected from the group consisting of water, organic alcohol, hydroxylated siloxane, and combinations thereof in an amount to provide a molar ratio of from about 0.02/1 to about 15/1 of hydroxyl radicals to silicon-bonded hydrogen atoms of component (b); (d) from about 1 to about 250 parts per million of platinum catalyst; and (e) an amount of amine compound effective to lower foam density of the formula;
space="preserve" listing-type="equation">NR.sub.3.sup.4wherein R4 is selected from the group consisting of hydrogen, hydroxy, substituted or unsubstituted alkyl of 1 to 18 carbon atoms and substituted or unsubstituted aryl of 1 to 18 carbon atoms, and a substituted or unsubstituted silyl. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A foamable composition consisting essentially of:
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(a) 100 parts by weight of a vinyl-containing polysiloxane of the formula;
##STR7## where R and R1 are selected from substituted or unsubstituted hydrocarbon radicals of from 1 to 20 carbon atoms, such that the polymer contains from 0.0002 to 3% by weight vinyl and x varies such that the viscosity of the polymer varies from 100 to 1,000,000 centipoise at 25°
C.;(b) from 1 to 50 parts by weight of a hydride polysiloxane of the formula;
##STR8## where R2 is selected from the group consisting of, independently, hydrogen, alkyl radicals of from 1 to 8 carbon atoms, aryl radicals of from 1 to 8 carbon atoms, haloalkyl radicals of 3 to 8 carbon atoms and simultaneously, a single --O-- to form a cyclic polymer, and R3 is selected from the group consisting of alkyl radicals of from 1 to 8 carbon atoms, aryl radicals of from 1 to 8 carbon atoms, and fluoroalkyl radicals of 3 to 8 carbon atoms, where the hydride polysiloxane has a hydrogen content varying from 0.3 to 1.6% by weight and z and y vary such that the polymer has a viscosity varying from 1 to 500 centipoise at 25°
C.;(c) a hydroxyl source selected from the group consisting of water, organic alcohol, hydroxylated siloxane, and combinations thereof in an amount to provide a molar ratio of from about 0.02/1 to about 5/1 of hydroxyl radicals to silicon-bonded hydrogen atoms of component (b); (d) from about 1 to about 250 parts per million of platinum catalyst; (e) an amount of amine compound effective to lower foam density of the formula;
space="preserve" listing-type="equation">NR.sub.3.sup.4wherein R4 is selected from the group consisting of hydrogen, hydroxy, substituted or unsubstituted alkyl of 1 to 18 carbon atoms and substituted or unsubstituted aryl of 1 to 18 carbon atoms, and substituted or unsubstituted silyl; (f) from 0 to 200 parts by weight of filler. - View Dependent Claims (40)
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Specification