US4925895A
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US
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Heat stabilized silicone elastomers
Assignee: Xerox Corp
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Filing: 1988-05-12
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Granted: 1990-05-15
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Expires: 2008-05-12
Abstract
Abstract A silicone composition curable to a heat stabilized silicone elastomer comprising at least one polyorganosiloxane having the formula: <IMAGE> where R is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A and D may be any of methyl, hydroxy or vinyl groups, 0<m/n</=1 and m+n>350, a complex comprising a transition metal salt of at least one polydentate chelating ligand having the formula: <IMAGE> where each R1 may be an alkyl biradical having 1 to 6 carbon atoms or an aryl biradical having less than 19 carbon atoms R1, is an X' substituted R1, each of Z and E may be any of carboxy thiocarboxy, dithiocarboxy, or -N(R2)2, -As(R2)2, -S(R2) where each R2 may be any of hydrogen or an alkyl radical having 1 to 6 carbon atoms or any aryl radical having less than 19 carbon atoms, X' may be any of hydrogen, carboxy, thiocarboxy, dithiocarboxy, -N(R2)2, -As(R2)2, or -S(R2), X is -N(R2)-, -As(R2)-, or -S- and p is 0 to 4 present in the composition in an amount sufficient to inhibit oxidative degradation of the polyorganosiloxane and a finely divided filler and effective amounts of crosslinking agent and catalyst. The complex may be predispersed in a polyorganosiloxane oil having a viscosity within a range of to 50 to 100,000 centistokes. In a preferred embodiment for use in an electrostatographic reproducing machine a fuser member is made with an addition curable polyorganosiloxane and the complex is bis(ethylene diamine) copper (II) sulfate initially redispersed in a low viscosity silicone oil and subsequently dispersed in a higher viscosity silicone oil.
Inventors
- 👤 George J. Heeks
- 👤 Arnold W. Henry
- 👤 Edward L. Schlueter, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:54
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2057; C; C08; C08K; C08K5/00; C08K5/0091; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249994; Y10T428/249995; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 56
Claim 1
Independent Claim
260 words
A composition curable to a heat stabilized crosslinked silicone elastomer when mixed with a crosslinking agent and crosslinking catalyst in amounts sufficient to promote crosslinking, comprising; (a) 100 parts by weight of at least one polyorganosiloxane having the Formula "a": ##STR16## where R is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A and D may be any of methyl, hydroxy or vinyl groups, < m/n≦1 and m+n>350, (b) a complex comprising a transition metal sulfate, nitrate, phosphate, halide, acetate, carboxylate, nitrite or perfluoroborate and at least one polydentate chelating ligand of the formula ##STR17## where each R 1 may be an alkyl biradical having 1 to 6 carbon atoms or an aryl biradical having less than 19 carbon atoms, R' 1 , is an X' substituted R 1 , each of Z and E may be any of carboxy, thiocarboxy, dithiocarboxy, or --N(R 2 ).sbsb.2, --A s (R 2 ).sbsb.2, --S(R 2 ) where each R 2 may be any of hydrogen or an alkyl radical having 1 to 6 carbon atoms or an aryl radical having less than 19 carbon atoms, X' may be any of hydrogen, carboxy, thiocarboxy, dithiocarboxy, --N(R 2 ).sbsb.2, --A s (R 2 ).sbsb.2, or --S(R 2 ), X is --N(R 2 )--, --A s (R 2 )--, or --S-- and p is 0 to 4, said complex being present in an amount sufficient to inhibit oxidative degradation of said polyorganosiloxane, (c) from about 5 to about 500 parts by weight of finely divided fillers.
Claim 2
Dependent Claim
260 words
A composition curable to a heat stabilized crosslinked silicone elastomer when mixed with a crosslinking agent and crosslinking catalyst in amounts sufficient to promote crosslinking, comprising; (a) 100 parts by weight of at least one polyorganosiloxane having the Formula "a": ##STR16## where R is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A and D may be any of methyl, hydroxy or vinyl groups, < m/n≦1 and m+n>350, (b) a complex comprising a transition metal sulfate, nitrate, phosphate, halide, acetate, carboxylate, nitrite or perfluoroborate and at least one polydentate chelating ligand of the formula ##STR17## where each R 1 may be an alkyl biradical having 1 to 6 carbon atoms or an aryl biradical having less than 19 carbon atoms, R' 1 , is an X' substituted R 1 , each of Z and E may be any of carboxy, thiocarboxy, dithiocarboxy, or --N(R 2 ).sbsb.2, --A s (R 2 ).sbsb.2, --S(R 2 ) where each R 2 may be any of hydrogen or an alkyl radical having 1 to 6 carbon atoms or an aryl radical having less than 19 carbon atoms, X' may be any of hydrogen, carboxy, thiocarboxy, dithiocarboxy, --N(R 2 ).sbsb.2, --A s (R 2 ).sbsb.2, or --S(R 2 ), X is --N(R 2 )--, --A s (R 2 )--, or --S-- and p is 0 to 4, said complex being present in an amount sufficient to inhibit oxidative degradation of said polyorganosiloxane, (c) from about 5 to about 500 parts by weight of finely divided fillers.
Claim 3
Dependent Claim
26 words
The curable composition of claim 1 wherein said at least one polyorganosiloxane as designated in "a" is an addition curable vinyl terminated or vinyl pendant polyorganosiloxane.
Claim 4
Dependent Claim
35 words
The curable composition of claim 2, wherein said at least one polyorganosiloxane has the formula: ##STR18## where A", D" and R" are methyl or vinyl provided the vinyl functionality is at least 2, 0<s/r≦1, 350<r+s<2700.
Claim 5
Dependent Claim
23 words
The curable composition of claim 3, wherein said crosslinking agent is a methylhydrodimethylsiloxane copolymer with from about 15 to 70 mole percent methylhydrosiloxane.
Claim 6
Dependent Claim
50 words
The curable composition of claim 2 including said crosslinking agent and catalyst wherein a portion of the polyorganosiloxane is premixed with the crosslinking catalyst and a portion of the filler and the remaining portion of the polyorganosiloxane is premixed with the crosslinking agent and the remaining portion of the filler.
Claim 7
Dependent Claim
26 words
The curable composition of claim 1 wherein said at least one polyorganosiloxane as designated in "a" is a condensation curable silanol terminated or silanol pendant polyorganosiloxane.
Claim 8
Dependent Claim
50 words
The curable composition of claim 6 including said crosslinking agent and catalyst wherein a portion of the polyorganosiloxane is premixed with the crosslinking catalyst and a portion of the filler and the remaining portion of the polyorganosiloxane is premixed with the crosslinking agent and the remaining portion of the filler.
Claim 9
Dependent Claim
29 words
The curable composition of claim 1 wherein said at least one polyorganosiloxane as designated in "a" is a peroxide curable vinyl terminated or vinyl pendant polyorganosiloxane having an m+n≧3000.
Claim 10
Dependent Claim
36 words
The curable composition of claim 1 wherein said complex is present in an amount of from about 1 to about 20 parts by weight per 100 parts by weight of total polyorganosiloxane as designated in "a".
Claim 11
Dependent Claim
15 words
The curable composition of claim 9 wherein said complex is bis(ethylene diamine) copper (II) sulfate.
Claim 12
Dependent Claim
124 words
The curable composition of claim 1 wherein said complex is predispersed in a polyorganosiloxane oil or blend of polyorganosiloxane oils of the formula: ##STR19## where R' is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A' and D' may be any of methyl, hydroxy or vinyl groups, R', A' and D' being selected to minimize reaction with R, A or D in the formula in "a" to minimize the formation of a crosslinked product therebetween, 0<m'/n'≦1 and 8<m'+n'<2000, said oil or blend of oils having a viscosity within the range from about 50 centistokes to 100,000 centistokes and being present in an amount of from about 5 to 100 parts per 100 parts of "a".
Claim 13
Dependent Claim
14 words
The curable composition of claim 11 wherein said oil comprises a trimethyl-end blocked polyorganosiloxane.
Claim 14
Dependent Claim
27 words
The curable composition of claim 11 wherein said at least one polyorganosiloxane as designated in "a" is a liquid addition curable vinyl terminated or vinyl pendant polyorganosiloxane.
Claim 15
Dependent Claim
35 words
The curable composition of claim 13, wherein said at least one polyorganosiloxane has the formula: ##STR20## where A", D" and R" are methyl or vinyl provided the vinyl functionality is at least 2, 0<s/r≦1, 350<r+s<2700.
Claim 16
Dependent Claim
22 words
The curable composition of claim 14, wherein said crosslinking agent is a methylhydrodimethylsiloxane copolymer with from about 15 to 70 percent methylhydrosiloxane.
Claim 17
Dependent Claim
50 words
The curable composition of claim 13 including said crosslinking agent and catalyst wherein a portion of the polyorganosiloxane is premixed with the crosslinking catalyst and a portion of the filler and the remaining portion of the polyorganosiloxane is premixed with the crosslinking agent and the remaining portion of the filler.
Claim 18
Dependent Claim
26 words
The curable composition of claim 11 wherein said at least one polyorganosiloxane as designated in "a" is a condensation curable silanol terminated or silanol pendant polyorganosiloxane.
Claim 19
Dependent Claim
50 words
The curable composition of claim 17 including said crosslinking agent and catalyst wherein a portion of the polyorganosiloxane is premixed with the crosslinking catalyst and a portion of the filler and the remaining protion of the polyorganosiloxane is premixed with the crosslinking agent and the remaining portion of the filler.
Claim 20
Dependent Claim
29 words
The curable composition of claim 11 wherein said at least one polyorganosiloxane as designated in "a" is a peroxide curable vinyl terminated or vinyl pendant polyorganosiloxane having an m+n≧3000.
Claim 21
Dependent Claim
36 words
The curable composition of claim 11 wherein said complex is present in an amount of from about 1 to about 20 parts by weight per 100 parts by weight of total polyorganosiloxane as designated in "a".
Claim 22
Dependent Claim
15 words
The curable composition of claim 20 wherein said complex is bis(ethylene diamine) copper (II) sulfate.
Claim 23
Dependent Claim
48 words
The curable composition of claim 11 wherein the complex is predispersed in a blend of a polyorganosiloxane oil having a viscosity of from about 50 to 100 centistokes and a polyorganosiloxane oil having a viscosity of from about 100 to about 100,000 centistokes by mechanical grinding and dispersion.
Claim 24
Dependent Claim
273 words
A heat stabilized silicone elastomer comprising the crosslinked product of; (a) 100 parts by weight of at least one polyorganosiloxane having the Formula "a": ##STR21## where R is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A and D may be any of methyl, hydroxy or vinyl groups, < m/n≦1 and m+n>350, (b) a complex comprising a transition metal sulfate, nitrate, phosphate, halide, acetate, carboxylate, nitrite or perfluoroborate and at least one polydentate chelating ligand of the formula ##STR22## where each R 1 may be an alkyl biradical having 1 to 6 carbon atoms or an aryl biradical having less than 19 carbon atoms, R' 1 , is an X' substituted R 1 , each of Z and E may be any of carboxy, thiocarboxy, dithiocarboxy or --N(R 2 ).sbsb.2, --A s (R 2 ).sbsb.2, --S(R 2 ) where each R 2 may be any of hydrogen or an alkyl radical having 1 to 6 carbon atoms or any aryl radical having less than 19 carbon atoms, X' may be any of hydrogen, carboxy, thiocarboxy, dithiocarboxy, --N(R 2 ).sbsb.2, --A s (R 2 ).sbsb.2, or --S(R 2 ), X is --N(R 2 )--, --A s (R 2 )--, or --S-- and p is 0 to 4, said complex being present in an amount sufficient to inhibit oxidative degradation of said polyorganosiloxane, (c) from about 5 to about 500 parts by weight of finely divided fillers, and (d) a crosslinking agent and a crosslinking catalyst, said crosslinking agent and catalyst being present in an amount sufficient to promote crosslinking of said at least one polyorganosiloxane.
Claim 25
Dependent Claim
273 words
A heat stabilized silicone elastomer comprising the crosslinked product of; (a) 100 parts by weight of at least one polyorganosiloxane having the Formula "a": ##STR21## where R is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A and D may be any of methyl, hydroxy or vinyl groups, < m/n≦1 and m+n>350, (b) a complex comprising a transition metal sulfate, nitrate, phosphate, halide, acetate, carboxylate, nitrite or perfluoroborate and at least one polydentate chelating ligand of the formula ##STR22## where each R 1 may be an alkyl biradical having 1 to 6 carbon atoms or an aryl biradical having less than 19 carbon atoms, R' 1 , is an X' substituted R 1 , each of Z and E may be any of carboxy, thiocarboxy, dithiocarboxy or --N(R 2 ).sbsb.2, --A s (R 2 ).sbsb.2, --S(R 2 ) where each R 2 may be any of hydrogen or an alkyl radical having 1 to 6 carbon atoms or any aryl radical having less than 19 carbon atoms, X' may be any of hydrogen, carboxy, thiocarboxy, dithiocarboxy, --N(R 2 ).sbsb.2, --A s (R 2 ).sbsb.2, or --S(R 2 ), X is --N(R 2 )--, --A s (R 2 )--, or --S-- and p is 0 to 4, said complex being present in an amount sufficient to inhibit oxidative degradation of said polyorganosiloxane, (c) from about 5 to about 500 parts by weight of finely divided fillers, and (d) a crosslinking agent and a crosslinking catalyst, said crosslinking agent and catalyst being present in an amount sufficient to promote crosslinking of said at least one polyorganosiloxane.
Claim 26
Dependent Claim
29 words
The heat stabilized silicone elastomer of claim 23 wherein said at least one polyorganosiloxane as designated in "a" is a liquid addition curable vinyl terminated or vinyl pendant polyorganosiloxane.
Claim 27
Dependent Claim
37 words
The heat stabilized silicone elastomer of claim 24, wherein said at least one polyorganosiloxane has the formula: ##STR23## where A", D" and R" are methyl or vinyl provided the vinyl functionality is at least 2, 0<s/r≦1, 350<r+s<2700.
Claim 28
Dependent Claim
25 words
The heat stabilized silicone elastomer of claim 25, wherein said crosslinking agent is a methylhydrodimethylsiloxane copolymer with from about 15 to 70 mole percent methylhydrosiloxane.
Claim 29
Dependent Claim
46 words
The heat stabilized silicone elastomer of claim 24 wherein a portion of the polyorganosiloxane is premixed with the crosslinking catalyst and a portion of the filler and the remaining portion of the polyorganosiloxane is premixed with the crosslinking agent and the remaining portion of the filler.
Claim 30
Dependent Claim
28 words
The heat stabilized silicone elastomer of claim 23 wherein said at least one polyorganosiloxane as designated in "a" is a condensation curable silanol terminated or silanol pendant polyorganosiloxane.
Claim 31
Dependent Claim
46 words
The heat stabilized silicone elastomer of claim 28 wherein a portion of the polyorganosiloxane is premixed with the crosslinking catalyst and a portion of the filler and the remaining portion of the polyorganosiloxane is premixed with the crosslinking agent and the remaining portion of the filler.
Claim 32
Dependent Claim
31 words
The heat stabilized silicone elastomer of claim 23 wherein said at least one polyorganosiloxane as designated in "a" is a peroxide curable vinyl terminated or vinyl pendant polyorganosiloxane having an m+n≧3000.
Claim 33
Dependent Claim
38 words
The heat stabilized silicone elastomer of claim 23 wherein said complex is present in an amount of from about 1 to about 20 parts by weight per 100 parts by weight of total polyorganosiloxane as designated in "a".
Claim 34
Dependent Claim
17 words
The heat stabilized silicone elastomer of claim 31 wherein said complex is bis(ethylene diamine) copper (II) sulfate.
Claim 35
Dependent Claim
126 words
The heat stabilized silicone elastomer of claim 23 wherein said complex is predispersed in a polyorganosiloxane oil or blend of polyorganosiloxane oils of the formula: ##STR24## wherein R' is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A' and D' may be any of methyl, hydroxy or vinyl groups, R', A' and D' being selected to minimize reaction with R, A or D in the formula in "a" to minimize the formation of a crosslinked product therebetween, 0<m'/n'≦1 and 8<m'+n'<2000, said oil or blend of oils having a viscosity within the range from about 50 centistokes to 100,000 centistokes and being present in an amount of from about 5 to 100 parts per 100 parts of "a".
Claim 36
Dependent Claim
16 words
The heat stabilized silicone elastomer of claim 33 wherein said oil comprises a trimethyl-end blocked polyorganosiloxane.
Claim 37
Dependent Claim
34 words
The heat stabilized silicone elastomer of claim 33 wherein said at least one polyorganosiloxane as designated in "a" is an addition curable vinyl terminated or vinyl pendant polyorganosiloxane including said crosslinking agent and catalyst.
Claim 38
Dependent Claim
37 words
The heat stabilized silicone elastomer of claim 35, wherein said at least one polyorganosiloxane has the formula: ##STR25## where A", D" and R" are methyl or vinyl provided the vinyl functionality is at least 2, 0<s/r≦1, 350<r+s<2700.
Claim 39
Dependent Claim
25 words
The heat stabilized silicone elastomer of claim 36, wherein said crosslinking agent is a methylhydrodimethylsiloxane copolymer with from about 15 to 70 mole percent methylhydrosiloxane.
Claim 40
Dependent Claim
46 words
The heat stabilized silicone elastomer of claim 35 wherein a portion of the polyorganosiloxane is premixed with the crosslinking catalyst and a portion of the filler and the remaining portion of the polyorganosiloxane is premixed with the crosslinking agent and the remaining portion of the filler.
Claim 41
Dependent Claim
28 words
The heat stabilized silicone elastomer of claim 33 wherein said at least one polyorganosiloxane as designated in "a" is a condensation curable silanol terminated or silanol pendant polyorganosiloxane.
Claim 42
Dependent Claim
46 words
The heat stabilized silicone elastomer of claim 39 wherein a portion of the polyorganosiloxane is premixed with the crosslinking catalyst and a portion of the filler and the remaining portion of the polyorganosiloxane is premixed with the crosslinking agent and the remaining portion of the filler.
Claim 43
Dependent Claim
31 words
The heat stabilized silicone elastomer of claim 33 wherein said at least one polyorganosiloxane as designated in "a" is a peroxide curable vinyl terminated or vinyl pendant polyorganosiloxane having an m+n≧3000.
Claim 44
Dependent Claim
38 words
The heat stabilized silicone elastomer of claim 33 wherein said complex is present in an amount of from about 1 to about 20 parts by weight per 100 parts by weight of total polyorganosiloxane as designated by "a".
Claim 45
Dependent Claim
17 words
The heat stabilized silicone elastomer of claim 42 wherein said complex is bis(ethylene diamine) copper (II) sulfate.
Claim 46
Dependent Claim
51 words
The heat stabilized silicone elastomer of claim 33 wherein the complex is initially predispersed in a blend of a polyorganosiloxane oil having a viscosity of from about 50 to 100 centistokes and a polyorganosiloxane oil having a viscosity of from about 100 to about 100,000 centistokes by mechanical grinding and dispersion.
Claim 47
Dependent Claim
161 words
A composition curable to a heat stabilized crosslinked silicone elastomer when mixed with a crosslinking agent and crosslinking catalyst in amounts sufficient to promote crosslinking, comprising; (a) 100 parts by weight of at least one polyorganosiloxane having the Formula "a": ##STR26## where R is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A and D may be any of methyl, hydroxy or vinyl groups, < m/n≦1 and m+n>350, (b) a complex comprising a transition metal sulfate, nitrate, phosphate, halide, acetate, carboxylate, nitrite or perfluoroborate and at least one polydentate chelating ligand selected from the group consisting of ethylene diamine, diethylene triamine, o-phenylene bisdimethylarsine, glycine, tetramethylene diamine, propylene diamine, isobutylene diamine, butylene diamine, alanine, valine, cysteine, bis(ethylene diethylamino) amine, and diethylamino methylene dithiocarboxylic acid, said complex being present in an amount sufficient to inhibit oxidative degradation of said polyorganosiloxane, (c) from about 5 to about 500 parts by weight of finely divided fillers.
Claim 48
Dependent Claim
161 words
A composition curable to a heat stabilized crosslinked silicone elastomer when mixed with a crosslinking agent and crosslinking catalyst in amounts sufficient to promote crosslinking, comprising; (a) 100 parts by weight of at least one polyorganosiloxane having the Formula "a": ##STR26## where R is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A and D may be any of methyl, hydroxy or vinyl groups, < m/n≦1 and m+n>350, (b) a complex comprising a transition metal sulfate, nitrate, phosphate, halide, acetate, carboxylate, nitrite or perfluoroborate and at least one polydentate chelating ligand selected from the group consisting of ethylene diamine, diethylene triamine, o-phenylene bisdimethylarsine, glycine, tetramethylene diamine, propylene diamine, isobutylene diamine, butylene diamine, alanine, valine, cysteine, bis(ethylene diethylamino) amine, and diethylamino methylene dithiocarboxylic acid, said complex being present in an amount sufficient to inhibit oxidative degradation of said polyorganosiloxane, (c) from about 5 to about 500 parts by weight of finely divided fillers.
Claim 49
Dependent Claim
42 words
The curable composition of claim 45, wherein said complex is selected from the group consisting of bis(ethylene diamine) copper (II) sulfate, bis(propylene diamine) copper (II) sulfate, bis(diethylene triamine) cobalt (III) nitrate, tris(ethylene diamine) cobalt (III) chloride, and bis(ethylene diamine) platinum (II) chloride.
Claim 50
Dependent Claim
15 words
The curable composition of claim 46 wherein said complex is bis(ethylene diamine) copper (II) sulfate.
Claim 51
Dependent Claim
124 words
The curable composition of claim 45 wherein said complex is predispersed in a polyorganosiloxane oil or blend of polyorganosiloxane oils of the formula: ##STR27## where R' is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A' and D' may be any of methyl, hydroxy or vinyl groups, R', A' and D' being selected to minimize reaction with R, A or D in the formula in "a" to minimize the formation of a crosslinked product therebetween, 0≦m'/n'<1 and 8<m'+n'<2000, said oil or blend of oils having a viscosity within the range from about 50 centistokes to 100,000 centistokes and being present in an amount of from about 5 to 100 parts per 100 parts of "a".
Claim 52
Dependent Claim
174 words
A heat stabilized silicone elastomer comprising the crosslinked product of; (a) 100 parts by weight of at least one polyorganosiloxane having the Formula "a": ##STR28## where R is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A and D may be any of methyl, hydroxy or vinyl groups, < m/n≦1 and m+n>350, (b) a complex comprising a transition metal sulfate, nitrate, phosphate, halide, acetate, carboxylate, nitrite or perfluoroborate and at least one polydentate chelating ligand selected from the group consisting of ethylene diamine, diethylene triamine, o-phenylene bisdimethylarsine, glycine, tetramethylene diamine, propylene diamine, isobutylene diamine, butylene diamine, alanine, valine, cysteine, bis(ethylene diethylamino) amine, and diethylamino methylene dithiocarboxylic acid, said complex being present in an amount sufficient to inhibit oxidative degradation of said polyorganosiloxane, (c) from about 5 to about 500 parts by weight of finely divided fillers; and (d) a crosslinking agent and a crosslinking catalyst, said crosslinking agent and catalyst being present in an amount sufficient to promote crosslinking of said at least one polyorganosiloxane.
Claim 53
Dependent Claim
174 words
A heat stabilized silicone elastomer comprising the crosslinked product of; (a) 100 parts by weight of at least one polyorganosiloxane having the Formula "a": ##STR28## where R is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A and D may be any of methyl, hydroxy or vinyl groups, < m/n≦1 and m+n>350, (b) a complex comprising a transition metal sulfate, nitrate, phosphate, halide, acetate, carboxylate, nitrite or perfluoroborate and at least one polydentate chelating ligand selected from the group consisting of ethylene diamine, diethylene triamine, o-phenylene bisdimethylarsine, glycine, tetramethylene diamine, propylene diamine, isobutylene diamine, butylene diamine, alanine, valine, cysteine, bis(ethylene diethylamino) amine, and diethylamino methylene dithiocarboxylic acid, said complex being present in an amount sufficient to inhibit oxidative degradation of said polyorganosiloxane, (c) from about 5 to about 500 parts by weight of finely divided fillers; and (d) a crosslinking agent and a crosslinking catalyst, said crosslinking agent and catalyst being present in an amount sufficient to promote crosslinking of said at least one polyorganosiloxane.
Claim 54
Dependent Claim
44 words
The heat stabilized silicone elastomer of claim 49, wherein said complex is selected from the group consisting of bis(ethylene diamine) copper (II) sulfate, bis(propylene diamine) copper (II) sulfate, bis(diethylene triamine) cobalt (III) nitrate, tris(ethylene diamine) cobalt (III) chloride, and bis(ethylene diamine) platinum (II) chloride.
Claim 55
Dependent Claim
17 words
The heat stabilized silicone elastomer of claim 50 wherein said complex is bis(ethylene diamine) copper (II) sulfate.
Claim 56
Dependent Claim
133 words
The heat stabilized silicone elastomer of claim 49 wherein said complex is predispersed in a polyorganosiloxane oil or blend of polyorganosiloxane oils of the formula: ##STR29## wherein R' is hydrogen or substituted or unsubstituted alkyl, alkenyl or aryl having less than 19 carbon atoms, each of A' and D' may be any of methyl, hydroxy or vinyl groups, R', A' and D' being selected to minimize reaction with R, A or D in the formula in "a" to minimize the formation of a crosslinked product therebetween, 0<m'/n'≦1 and 8<m'+n'<2000, greater than 8 and less than 2000, said oil or blend of oils having a viscosity within the range from about 50 centistokes to 100,000 centistokes and being present in an amount of from about 5 to 100 parts per 100 parts of "a".
References Cited (Backward Citations)
US2389802A
Cited
US2465296A
Cited
US3216969A
Cited
GB1058238A
Cited
GB1000563A
Cited
US3419593A
Cited
US3445420A
Cited
US3647741A
Cited
US4019024A
Cited
US4074001A
Cited
US4078286A
Cited
US4108825A
Cited
US4162243A
Cited
US4373239A
Cited
US4357388A
Cited
US4360566A
Cited
US4463118A
Cited
US4444944A
Cited
US4603087A
Cited
US4518655A
Cited
EP0204526A2
Cited
EP0624081A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |