US4492786A — Modified organopolysiloxane composition

Claim 1

Independent Claim 146 words

a curable fluorosilicone composition comprising: (A) an organopolysiloxane having terminal groups selected from the class consisting of --H, --OH, --R, --OR, and --CH═CH 2 , and pendant groups, bonded directly to silicon, selected from --R, --R' and --R'--R" groups, wherein R is a monovalent hydrocarbon radical of from 1 to 8 carbon atoms free of aliphatic unsaturation, R' is a monovalent hydrocarbon or halo-hydrocarbon radical of from 1 to 8 carbon atoms, and R" is a monomeric or polymeric group grafted to said R' group and derived from an unsaturated fluorocarbon or mixture of unsaturated fluorocarbons having 2 or 3 carbon atoms and up to 6 fluorine atoms grafted to the organic radicals represented by R', said organopolysiloxane having at least one pendant --R'--R" group; (B) a vinyl-functional polymeric crosslinking agent; and (C) a free-radical initiator capable of promoting crosslinking between components (A) and (B), above.

Claim 2

Dependent Claim 146 words

a curable fluorosilicone composition comprising: (A) an organopolysiloxane having terminal groups selected from the class consisting of --H, --OH, --R, --OR, and --CH═CH 2 , and pendant groups, bonded directly to silicon, selected from --R, --R' and --R'--R" groups, wherein R is a monovalent hydrocarbon radical of from 1 to 8 carbon atoms free of aliphatic unsaturation, R' is a monovalent hydrocarbon or halo-hydrocarbon radical of from 1 to 8 carbon atoms, and R" is a monomeric or polymeric group grafted to said R' group and derived from an unsaturated fluorocarbon or mixture of unsaturated fluorocarbons having 2 or 3 carbon atoms and up to 6 fluorine atoms grafted to the organic radicals represented by R', said organopolysiloxane having at least one pendant --R'--R" group; (B) a vinyl-functional polymeric crosslinking agent; and (C) a free-radical initiator capable of promoting crosslinking between components (A) and (B), above.

Claim 3

Dependent Claim 38 words

A curable composition as defined in claim 1, wherein the organopolysiloxane component (A) has the formula: ##STR3## wherein T represents a terminal group, a and b are positive integers, and a+b is equal to from 10 to 3700.

Claim 4

Dependent Claim 18 words

A curable composition as defined in claim 2, wherein the free-radical initiator component (C) is an organic peroxide.

Claim 5

Dependent Claim 20 words

A curable composition as defined in claim 3, wherein said organic peroxide initiator contains at least one tertiary alkoxy radical.

Claim 6

Dependent Claim 38 words

A curable composition as defined in claim 4, wherein said peroxide initiator is selected from the group consisting of t-butyl hydroperoxide, cumene hydroperoxide, decaline hydroperoxide, di-t-butyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di-(t-butyl peroxy)hexane, ascaridole, 1,5-dimethylhexane-1,5-peroxide, t-butylperbenzoate, t-butylperoxyisopropylcarbonate and t-butyl peroctoate.

Claim 7

Dependent Claim 93 words

A curable composition as defined in claim 4, wherein the vinyl-functional crosslinking agent (B) is a polysiloxane consisting of from 0.5 to 100 weight percent vinyl-containing siloxane units having the formula (CH 2 ═CH)R 3 a SiO 3-a/2 , wherein R 3 is a monovalent hydrocarbon or monovalent halo-hydrocarbon radical and a has a value of from 0 to 2, any non-vinyl-containing siloxane units having the formula R 4 b SiO 4-b/2 , wherein R 4 is a monovalent hydrocarbon or halo-hydrocarbon radical and b has a value of from 0 to 3.

Claim 8

Dependent Claim 33 words

A curable composition as defined in claim 6, wherein said vinyl-functional crosslinking agent is selected from the group consisting of dimethylvinyl-chainstopped linear polydimethylsiloxane, dimethylvinyl-chainstopped polydimethyl-methylvinylsiloxane copolymer, vinyl methyl cyclotetrasiloxane, tetramethyldivinyldisiloxane, and mixtures thereof.

Claim 9

Dependent Claim 30 words

A curable composition as defined in claim 6, wherein said peroxide initiator is present in an amount of from about 0.01 to 5 weight percent, based on the total composition.

Claim 10

Dependent Claim 21 words

A curable composition as defined in claim 2, wherein said unsaturated fluorocarbon contains from 1 to 4 fluorine atoms per molecule.

Claim 11

Dependent Claim 15 words

A curable composition as defined in claim 9, wherein the unsaturated fluorocarbon is vinylidene fluoride.

Claim 12

Dependent Claim 18 words

A curable composition as defined in claim 10, wherein the free-radical initiator component (C) is an organic peroxide.

Claim 13

Dependent Claim 20 words

A curable composition as defined in claim 11, wherein said organic peroxide initiator contains at least one tertiary alkoxy radical.

Claim 14

Dependent Claim 38 words

A curable composition as defined in claim 12, wherein said peroxide initiator is selected from the group consisting of t-butyl hydroperoxide, cumene hydroperoxide, decaline hydroperoxide, di-t-butyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di-(t-butyl peroxy)hexane, ascaridole, 1,5-dimethylhexane-1,5-peroxide, t-butylperbenzoate, t-butylperoxyisopropylcarbonate and t-butyl peroctoate.

Claim 15

Dependent Claim 30 words

A curable composition as defined in claim 13, wherein said vinyl-functional crosslinking agent is selected from the group consisting of dimethylvinyl-chainstopped polydimethyl-methylvinylsiloxane copolymer, vinyl methyl cyclotetrasiloxane, tetramethyldivinyldisiloxane, and mixtures thereof.

Claim 16

Dependent Claim 45 words

A curable composition as defined in claim 14, wherein the grafted --R" groups comprise from about 7 to 25 weight percent of said organopolysiloxane component (A), and said organopolysiloxanes have a specific gravity in the range of about 1.01 to about 1.3 at room temperature.

Claim 17

Dependent Claim 26 words

A curable composition as defined in claim 1, which contains the additional component (D) of a filler selected from fumed silica, treated silica, and silica aerogel.

Claim 18

Dependent Claim 17 words

A curable composition as defined in claim 16, wherein said filler is fumed silica treated with octamethylcyclotetrasiloxane.

Claim 19

Dependent Claim 114 words

A process for preparing a curable fluorosilicone composition comprising the steps: (A) reacting (i) an organopolysiloxane having an average of two pendant monovalent hydrocarbon or halohydrocarbon groups of from 1-8 carbon atoms bonded to each silicon atom and terminal groups selected from hydrogen, hydroxyl, alkyl, alkoxy and vinyl of from 1-8 carbon atoms, with (ii) an unsaturated fluorocarbon or mixture of unsaturated fluorocarbons having 2 to 3 carbon atoms and up to 6 fluorine atoms in the presence of an organic peroxide initiator at a temperature of from about 50° C. to about 140° C.; and (B) combining the reaction product with (iii) a vinyl-functional polymeric crosslinking agent, and (iv) an organic peroxide initiator.

Claim 20

Dependent Claim 114 words

A process for preparing a curable fluorosilicone composition comprising the steps: (A) reacting (i) an organopolysiloxane having an average of two pendant monovalent hydrocarbon or halohydrocarbon groups of from 1-8 carbon atoms bonded to each silicon atom and terminal groups selected from hydrogen, hydroxyl, alkyl, alkoxy and vinyl of from 1-8 carbon atoms, with (ii) an unsaturated fluorocarbon or mixture of unsaturated fluorocarbons having 2 to 3 carbon atoms and up to 6 fluorine atoms in the presence of an organic peroxide initiator at a temperature of from about 50° C. to about 140° C.; and (B) combining the reaction product with (iii) a vinyl-functional polymeric crosslinking agent, and (iv) an organic peroxide initiator.

Claim 21

Dependent Claim 78 words

The process of claim 18, wherein said organopolysiloxane has the formula ##STR4## wherein T is selected from the group consisting of hydrogen, hydroxy, monovalent hydrocarbon or oxyhydrocarbon radicals of from 1 to 8 carbon atoms free of aliphatic unsaturation and vinyl; R is a monovalent hydrocarbon of from 1 to 8 carbon atoms; R' is a monovalent hydrocarbon or halo-hydrocarbon radical of from 1 to 8 carbon atoms; and n is an integer of from 10 to 3700.

Claim 22

Dependent Claim 16 words

The process of claim 19, wherein said unsaturated fluorocarbon has from 1 to 4 fluorine atoms.

Claim 23

Dependent Claim 12 words

The process of claim 20, wherein said unsaturated fluorocarbon is vinylidene fluoride.

Claim 24

Dependent Claim 12 words

The process of claim 21, wherein said organopolysiloxane is a trimethylsiloxy-chainstopped polydimethylsiloxane.

Claim 25

Dependent Claim 12 words

The process of claim 21, wherein said organopolysiloxane contains fluorohydrocarbon pendant groups.

Claim 26

Dependent Claim 14 words

The process of claim 23, wherein said organopolysiloxane is a trimethylsiloxy-endstopped trifluoropropyl-methyl siloxane homopolymer.

Claim 27

Dependent Claim 49 words

The process of claim 22, wherein said polydimethylsiloxane has a viscosity ranging from 30,000 to 600,000 cps, sufficient vinylidene fluoride is reacted to result in a range of about 7 to 25 weight percent vinylidene fluoride in the reaction product, and said organic peroxide initiator is a di-t-butyl peroxide.

Claim 28

Dependent Claim 108 words

A curable fluorosilicone composition prepared by: (A) reacting (i) an organopolysiloxane having an average of two pendant monovalent hydrocarbon or halohydrocarbon groups of from 1-8 carbon atoms bonded to each silicone atom and terminal groups selected from hydrogen, hydroxyl, alkyl, alkoxy and vinyl of from 1-8 carbon atoms, with (ii) an unsaturated fluorocarbon or mixture of unsaturated fluorocarbons having 2 or 3 carbon atoms and up to 6 fluorine atoms in the presence of an organic peroxide initiator at a temperature of from about 50° C. to 140° C.; and (B) combining the reaction product with (iii) a vinyl-functional polymeric crosslinking agent, and (iv) an organic peroxide initiator.

Claim 29

Dependent Claim 108 words

A curable fluorosilicone composition prepared by: (A) reacting (i) an organopolysiloxane having an average of two pendant monovalent hydrocarbon or halohydrocarbon groups of from 1-8 carbon atoms bonded to each silicone atom and terminal groups selected from hydrogen, hydroxyl, alkyl, alkoxy and vinyl of from 1-8 carbon atoms, with (ii) an unsaturated fluorocarbon or mixture of unsaturated fluorocarbons having 2 or 3 carbon atoms and up to 6 fluorine atoms in the presence of an organic peroxide initiator at a temperature of from about 50° C. to 140° C.; and (B) combining the reaction product with (iii) a vinyl-functional polymeric crosslinking agent, and (iv) an organic peroxide initiator.

Claim 30

Dependent Claim 111 words

A curable composition as defined in claim 26, wherein said reaction product has the formula: ##STR5## wherein R is a monovalent hydrocarbon radical of from 1 to 8 carbon atoms free of aliphatic unsaturation; R' is a monovalent hydrocarbon or halo-hydrocarbon radical of from 1 to 8 carbon atoms, R" is a monomeric or polymeric group derived from said unsaturated fluorocarbon or mixture of unsaturated fluorocarbons grafted to the organic radicals represented by R', T is selected from the group consisting of hydrogen, hydroxy, monovalent hydrocarbon or oxyhydrocarbon radicals of from 1 to 8 carbon atoms free of aliphatic unsaturation and vinyl, and a+b is equal to from 10 to 3700.

Claim 31

Dependent Claim 17 words

The curable composition of claim 27, wherein said unsaturated fluorocarbon has from 1 to 4 fluorine atoms.

Claim 32

Dependent Claim 13 words

The curable composition of claim 28, wherein the unsaturated fluorocarbon is vinylidene fluoride.

Claim 33

Dependent Claim 61 words

The curable composition of claim 27, wherein the vinyl-functional crosslinking agent is selected from the group consisting of dimethylvinyl-chainstopped linear polydimethylsiloxane, dimethylvinyl-chainstopped polydimethyl-methylvinylsiloxane copolymer, vinyl methyl cyclotetrasiloxane, tetramethyldivinyldisiloxane, and mixtures thereof; and the organic peroxide initiator is selected from the group consisting of t-butyl hydroperoxide, cumene hydroperoxide, decaline hydroperoxide, di-t-butyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di-(t-butyl peroxy)hexane, ascaridole, 1,5-dimethylhexane-1,5-peroxide, t-butylperbenzoate, t-butylperoxyisopropylcarbonate and t-butylperoctoate.

Claim 34

Dependent Claim 11 words

A solid article comprising the cured composition defined in claim 1.

Claim 35

Dependent Claim 11 words

A solid article comprising the cured composition defined in claim 26.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1988-01-08	1988-07-09	1989-01-08	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1992-01-08	1992-07-09	1993-01-08	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1996-01-08	1996-07-09	1997-01-08	$7700.00	Window Closed / Lapsed

Modified organopolysiloxane composition

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