US4233427A — Elastomeric organopolysiloxane block copolymers a…

Claim 1

Independent Claim 392 words

A thermoplastic, crystalline block copolymer comprising a plurality of recurring units selected from the group consisting of those of the structural formulae F 1 and F' 1 , and combinations thereof: F.sub.1 :--A[SiR.sub.2 (GSiR.sub.2).sub.a ASiR.sub.2 G'SiR.sub.2 A].sub.p SiR.sub.2 (GSiR.sub.2).sub.a ASiR.sub.2 (OSiR.sub.2).sub.n] and F'.sub.1 :--A[SiR.sub.2 G'SiR.sub.2 ASiR.sub.2 (GSiR.sub.2).sub.a A].sub.p SiR.sub.2 G'SiR.sub.2 ASiR.sub.2 (OSiR.sub.2).sub.n ] in which the symbols A, which are identical, represent linear or branched chain alkylene radicals having from 2 to 6 carbon atoms, or cyclohexylene radicals; the symbols R, which are identical or different, represent alkyl and halogenoalkyl radicals having from 1 to 5 carbon atoms, cycloalkyl and halogenocycloalkyl radicals having from 3 to 8 carbon atoms, aryl and halogenoaryl radicals having from 6 to 8 carbon atoms or cyanoalkyl radicals having from 3 to 4 carbon atoms; the symbols G, which are identical, represent linear or branched chain alkylene radicals having from 1 to 8 carbon atoms, divalent organic radicals corresponding to the formula F 2 :--CH 2 ) x QTQ(CH 2 -- x , in which the symbols Q, which are identical, represent one of the groups --O-- and --OCO--, the --OCO-- being bonded to T by the --CO-- radical, the symbol T represents a monocyclic, divalent hydrocarbon radical having from 6 to 8 carbon atoms, or a divalent organic radical which has from 10 to 22 carbon atoms and consists of 2 hydrocarbon rings which are fused to one another or bonded together by a valence bond or by one of the groups of the formulae --O--, --CH 2 --, --C(CH 3 ) 2 -- and --Si(R'-- 2 , wherein R' is an alkyl radical having from 1 to 3 carbon atoms, and the symbols x, which are identical, represent 1, 2 or 3, or divalent hydrocarbon radicals corresponding to the formula F 3 : --CH 2 ) b T(CH 2 ) b , in which the symbol T has the meaning given for the formula F 2 and the symbols b, which are identical, represent 0 or 1; the symbols G', which are identical, have the meaning given above for G, except that they do not correspond to the formula F 2 ; the symbols a, which are identical, represent 0 or 1; the symbol p represents any number ranging from 1 to 120; and the symbol n represents any number ranging from 1 to 1,500.

Claim 2

Dependent Claim 392 words

A thermoplastic, crystalline block copolymer comprising a plurality of recurring units selected from the group consisting of those of the structural formulae F 1 and F' 1 , and combinations thereof: F.sub.1 :--A[SiR.sub.2 (GSiR.sub.2).sub.a ASiR.sub.2 G'SiR.sub.2 A].sub.p SiR.sub.2 (GSiR.sub.2).sub.a ASiR.sub.2 (OSiR.sub.2).sub.n] and F'.sub.1 :--A[SiR.sub.2 G'SiR.sub.2 ASiR.sub.2 (GSiR.sub.2).sub.a A].sub.p SiR.sub.2 G'SiR.sub.2 ASiR.sub.2 (OSiR.sub.2).sub.n ] in which the symbols A, which are identical, represent linear or branched chain alkylene radicals having from 2 to 6 carbon atoms, or cyclohexylene radicals; the symbols R, which are identical or different, represent alkyl and halogenoalkyl radicals having from 1 to 5 carbon atoms, cycloalkyl and halogenocycloalkyl radicals having from 3 to 8 carbon atoms, aryl and halogenoaryl radicals having from 6 to 8 carbon atoms or cyanoalkyl radicals having from 3 to 4 carbon atoms; the symbols G, which are identical, represent linear or branched chain alkylene radicals having from 1 to 8 carbon atoms, divalent organic radicals corresponding to the formula F 2 :--CH 2 ) x QTQ(CH 2 -- x , in which the symbols Q, which are identical, represent one of the groups --O-- and --OCO--, the --OCO-- being bonded to T by the --CO-- radical, the symbol T represents a monocyclic, divalent hydrocarbon radical having from 6 to 8 carbon atoms, or a divalent organic radical which has from 10 to 22 carbon atoms and consists of 2 hydrocarbon rings which are fused to one another or bonded together by a valence bond or by one of the groups of the formulae --O--, --CH 2 --, --C(CH 3 ) 2 -- and --Si(R'-- 2 , wherein R' is an alkyl radical having from 1 to 3 carbon atoms, and the symbols x, which are identical, represent 1, 2 or 3, or divalent hydrocarbon radicals corresponding to the formula F 3 : --CH 2 ) b T(CH 2 ) b , in which the symbol T has the meaning given for the formula F 2 and the symbols b, which are identical, represent 0 or 1; the symbols G', which are identical, have the meaning given above for G, except that they do not correspond to the formula F 2 ; the symbols a, which are identical, represent 0 or 1; the symbol p represents any number ranging from 1 to 120; and the symbol n represents any number ranging from 1 to 1,500.

Claim 3

Dependent Claim 33 words

A block copolymer as defined by claim 1, wherein in the formulae F 1 and F' 1 , the symbols A represent a member selected from the group consisting of ethylene and 1,3-propylene.

Claim 4

Dependent Claim 37 words

A block copolymer as defined by claims 1 or 2, wherein, in the formulae F 1 and F' 1 , the symbols R represent a member selected from the group consisting of methyl, ethyl, n-propyl or phenyl.

Claim 5

Dependent Claim 56 words

A block copolymer as defined by claim 3, wherein, in the formulae F 1 and F' 1 , the symbols G represent divalent radicals of the formula F 2 , in which the symbol T represents a member selected from the group consisting of para-phenylene, para-cyclohexylene, 1,5-naphthylene or 2,7-naphthylene, and a radical of the formulae: ##STR79##

Claim 6

Dependent Claim 33 words

A block copolymer as defined by claim 4, wherein in the formulae F 1 and F' 1 , the symbols G represent a member selected from those divalent radicals of the formulae: ##STR80##

Claim 7

Dependent Claim 35 words

A block copolymer as defined by claim 3 wherein, in the formulae F 1 and F' 1 , the symbols G and G' represent a member selected from the group consisting of ethylene and 1,4-butylene.

Claim 8

Dependent Claim 58 words

A block copolymer as defined by claim 3, wherein, in the formulae F 1 and F' 1 , the symbols G and G' represent divalent radicals of the formula F 3 , in which the symbol T represents a member selected from the group consisting of para-phenylene, para-cyclohexylene, 1,5-naphthylene or 2,7-naphthylene, and a radical of the formulae: ##STR81##

Claim 9

Dependent Claim 30 words

A block copolymer as defined by claim 7, wherein, in the formulae F 1 and F' 1 , the symbols G and G' represent divalent radicals of the formulae: ##STR82##

Claim 10

Dependent Claim 54 words

A block copolymer as defined by claim 1, comprising a plurality of recurring units of the structural formula F" 1 : --A(SiR.sub.2 G'SiR.sub.2 A).sub.2p SiR.sub.2 G'SiR.sub.2 ASiR.sub.2 (OSiR.sub.2).sub.n -- corresponding to the formula F 1 and F' 1 , in which the symbols G are identical to G' and the symbols a represent 1.

Claim 11

Dependent Claim 58 words

A block copolymer as defined by claim 1, comprising a plurality of recurraing units selected from the group consisting of those of the structural formulae: ##STR83## p and n, in pairs, =12 and 111; 6.95 and 125, ##STR84## p and n, in pairs, =2 and 68; 3 and 37; 7 and 14.3; 9.5 and 115; 13.3 and 68.

Claim 12

Dependent Claim 168 words

A process for the preparation of a block copolymer comprising the structural formula F 1 units as defined by claim 1, wherein: (i) a crystalline organosilicic copolymer having the structural formula F i : A'[SiR.sub.2 (GSiR.sub.2).sub.a ASiR.sub.2 G'SiR.sub.2 A].sub.p SiR.sub.2 (GSiR.sub.2).sub.a A' is prepared by polyaddition of p+1 units of the diethylenic organosilicic compound of the formula A'SiR 2 (GSiR 2 ) a A' and p units of the dihydrogenated organosilicic compound of the formula HSiR 2 G'SiR 2 H, and (ii) at least one unit of the organosilicic copolymer of the formula F i is then reacted with at least one unit of the α,ω-dihydrogenopolydiorganosiloxane of the formula HSiR 2 (OSiR 2 ) n H, and wherein the above formulae, the symbols A, R, G, G', a, p and n have the meaning of the symbols included in the formula F 1 , and the symbols A', which are identical, represent linear or branched chain alkenyl radicals having from 2 to 6 carbon atoms, or cyclohexenyl radicals.

Claim 13

Dependent Claim 169 words

A process for the preparation of a block copolymer comprising the structural formula F' 1 units as defined by claim 1, wherein: (i) a crystalline organosilicic copolymer having the structural formula F h : H[SiR.sub.2 G'SiR.sub.2 ASiR.sub.2 (GSiR.sub.2).sub.a A].sub.p SiR.sub.2 G'SiR.sub.2 H is prepared by polyaddition of p+1 units of the dihydrogenated organosilicic compound of the formula HSiR 2 G'SiR 2 H and p units of the diethylenic organosilicic compound of the formula A'SiR 2 (GSiR 2 ) a A', and (ii) at least one unit of the organosilicic copolymer of the formula F h is then reacted with at least one unit of the α,ω-diethylenic polydiorganosiloxane of the formula A'SiR 2 (OSiR 2 ) n A', and wherein the above formulae, the symbols A, R, G, G', a, p and n have the meaning of the symbols included in the formula F 1 , and the symbols A', which are identical, represent linear or branched chain alkenyl radicals having from 2 to 6 carbon atoms, or cyclohexenyl radicals.

Claim 14

Dependent Claim 168 words

A process for the preparation of a block copolymer comprising the structural formula F" 1 units as defined by claim 9, wherein: (i) a crystalline organosilicic copolymer having the formula F' i : A'[SiR.sub.2 G'SiR.sub.2 A].sub.2p SiR.sub.2 G'SiR.sub.2 A' is prepared by polyaddition of the hydrogenomonoethylenic organosilicic compound of the formula A'SiR 2 G'SiR 2 H with itself 2p times, in the presence of one unit of a compound of the formula A'SiR 2 G'SiR 2 A' as the blocking element, and (ii) at least one unit of the copolymer of the formula F' i is then reacted with at least one unit of the α,ω-dihydrogenopolydiorganosiloxane of the formula HSiR 2 (OSiR 2 ) n H, and wherein the above formulae, the symbols A, R, G, G', a, p and n have the meaning of the symbols included in the formula F 1 , and the symbols A', which are identical, represent linear or branched chain alkenyl radicals having from 2 to 6 carbon atoms, or cyclohexenyl radicals.

Claim 15

Dependent Claim 170 words

A process for the preparation of a block copolymer comprising the structural formula F" 1 units as defined by claim 9, wherein: (i) a crystalline organosilicic copolymer having the structural formula F' h : H[SiR.sub.2 G'SiR.sub.2 A].sub.2p SiR.sub.2 G'SiR.sub.2 H is prepared by polyaddition of the hydrogenomonoethylenic organosilicic compound of the formula A'SiR 2 G'SiR 2 H with itself 2p times, in the presence of one unit of a compound of the formula HSiR 2 G'SiR 2 H as the blocking element, and (ii) at least one unit of the copolymer of the formula F' h is then reacted with at least one unit of the α,ω-diethylenic polydiorganosiloxane of the formula A'SiR 2 (OSiR 2 ) n A', and wherein the above formulae, the symbols A, R, G, G', a, p and n have the meaning of the symbols included in the formula F 1 , and the symbols A', which are identical, represent linear or branched chain alkenyl radicals having from 2 to 6 carbon atoms, or cyclohexenyl radicals.

Claim 16

Dependent Claim 46 words

A process as defined by any of claims 11 to 14, wherein each reaction is carried out in the presence of a metal catalyst or of inorganic or organic derivatives thereof, said metal being selected from the group consisting of platinum, palladium, ruthenium, rhodium, and iridium.

Claim 17

Dependent Claim 42 words

A process as defined by claim 15, wherein each reaction is carried out in a solution or suspension of an inert organic solvent selected from the group consisting of aliphatic and cycloaliphatic hydrocarbons, halogenated derivatives thereof, aromatic hydrocarbons, and halogenated aromatic hydrocarbons.

Claim 18

Dependent Claim 41 words

A process as defined by claim 16, wherein the second stage reaction takes place in the homogeneous reaction medium of the first stage, without first isolating the organosilicic copolymer F i , F h , F' i or F' h .

Claim 19

Dependent Claim 389 words

A thermoplastic, crystalline block copolymer comprising a plurality of recurring units selected from the group consisting of those of the structural formulae F 1 and F' 1 , and combinations thereof: F.sub.1 : --A [SiR.sub.2 (GSiR.sub.2).sub.a ASiR.sub.2 G'SiR.sub.2 A).sub.p SiR.sub.2 (GSiR.sub.2).sub.a ASiR.sub.2 (OSiR.sub.2).sub.n -- and F'.sub.1 : --A [SiR.sub.2 G'SiR.sub.2 ASiR.sub.2 (GSiR.sub.2).sub.a A].sub.p SiR.sub.2 G'SiR.sub.2 ASiR.sub.2 (OSiR.sub.2).sub.n -- in which the symbols A, which are identical, represent linear or branched chain alkylene radicals having from 2 to 6 carbon atoms, or cyclohexylene radicals; the symbols R, which are identical or different, represent alkyl and halogenoalkyl radicals having from 1 to 5 carbon atoms, cycloalkyl and halogenocycloalkyl radicals having from 3 to 8 carbon atoms, aryl and halogenoaryl radicals having from 6 to 8 carbon atoms, cyanoalkyl radicals having from 3 to 4 carbon atoms; the symbols G, which are identical, represent divalent organic radicals corresponding to the formula F 2 : --CH 2 ) x QTQ(CH 2 -- x , in which the symbols Q, which are identical, represent one of the groups --O-- and --OCO--, the --OCO-- being bonded to T by the --CO-- radical, the symbol T represents a monocyclic, divalent hydrocarbon radical having from 6 to 8 carbon atoms, or a divalent organic radical which has from 10 to 22 carbon atoms and consists of 2 hydrocarbon rings which are fused to one another or bonded together by a valence bond or by one of the groups of the formulae --O--, --CH 2 --, --C(CH 3 ) 2 -- and --Si(R'-- 2 , wherein R' is an alkyl radical having from 1 to 3 carbon atoms, and the symbols x, which are identical, represent 1, 2 or 3, or divalent hydrocarbon radicals corresponding to the formula F 3 : --CH 2 ) b T(CH 2 ) b , in which the symbol T has the meaning given for the formula F 2 and the symbols b, which are identical, represent 0 or 1; the symbols G', which are identical, represent linear or branched chain alkylene radicals having from 1 to 8 carbon atoms, or divalent hydrocarbon radicals of the formula F 3 ; the symbols a, which are identical, represent 0 or 1; the symbol p represents any number ranging from 1 to 120; and the symbol n represents any number ranging from 1 to 1,500.

Claim 20

Dependent Claim 389 words

A thermoplastic, crystalline block copolymer comprising a plurality of recurring units selected from the group consisting of those of the structural formulae F 1 and F' 1 , and combinations thereof: F.sub.1 : --A [SiR.sub.2 (GSiR.sub.2).sub.a ASiR.sub.2 G'SiR.sub.2 A).sub.p SiR.sub.2 (GSiR.sub.2).sub.a ASiR.sub.2 (OSiR.sub.2).sub.n -- and F'.sub.1 : --A [SiR.sub.2 G'SiR.sub.2 ASiR.sub.2 (GSiR.sub.2).sub.a A].sub.p SiR.sub.2 G'SiR.sub.2 ASiR.sub.2 (OSiR.sub.2).sub.n -- in which the symbols A, which are identical, represent linear or branched chain alkylene radicals having from 2 to 6 carbon atoms, or cyclohexylene radicals; the symbols R, which are identical or different, represent alkyl and halogenoalkyl radicals having from 1 to 5 carbon atoms, cycloalkyl and halogenocycloalkyl radicals having from 3 to 8 carbon atoms, aryl and halogenoaryl radicals having from 6 to 8 carbon atoms, cyanoalkyl radicals having from 3 to 4 carbon atoms; the symbols G, which are identical, represent divalent organic radicals corresponding to the formula F 2 : --CH 2 ) x QTQ(CH 2 -- x , in which the symbols Q, which are identical, represent one of the groups --O-- and --OCO--, the --OCO-- being bonded to T by the --CO-- radical, the symbol T represents a monocyclic, divalent hydrocarbon radical having from 6 to 8 carbon atoms, or a divalent organic radical which has from 10 to 22 carbon atoms and consists of 2 hydrocarbon rings which are fused to one another or bonded together by a valence bond or by one of the groups of the formulae --O--, --CH 2 --, --C(CH 3 ) 2 -- and --Si(R'-- 2 , wherein R' is an alkyl radical having from 1 to 3 carbon atoms, and the symbols x, which are identical, represent 1, 2 or 3, or divalent hydrocarbon radicals corresponding to the formula F 3 : --CH 2 ) b T(CH 2 ) b , in which the symbol T has the meaning given for the formula F 2 and the symbols b, which are identical, represent 0 or 1; the symbols G', which are identical, represent linear or branched chain alkylene radicals having from 1 to 8 carbon atoms, or divalent hydrocarbon radicals of the formula F 3 ; the symbols a, which are identical, represent 0 or 1; the symbol p represents any number ranging from 1 to 120; and the symbol n represents any number ranging from 1 to 1,500.

Claim 21

Dependent Claim 33 words

A block copolymer as defined by claim 18, wherein in the formulae F 1 and F' 1 , the symbols A represent a member selected from the group consisting of ethylene and 1,3-propylene.

Claim 22

Dependent Claim 37 words

A block copolymer as defined by claims 18 or 19 wherein, in the formulae F 1 and F' 1 , the symbols R represent a member selected from the group consisting of methyl, ethyl, n-propyl or phenyl.

Claim 23

Dependent Claim 55 words

A block copolymer as defined by claim 20, wherein, in the formulae F 1 and F' 1 , the symbols G represent divalent radicals of formula F 2 , in which the symbol T represents a member selected from the group consisting of para-phenylene, para-cyclohexylene, 1,5-naphthylene or 2,7-naphthylene, and a radical of the formulae: ##STR85##

Claim 24

Dependent Claim 33 words

A block copolymer as defined by claim 21, wherein in the formulae F 1 and F' 1 , the symbols G represent a member selected from those divalent radicals of the formulae: ##STR86##

Claim 25

Dependent Claim 33 words

A block copolymer as defined by claim 21 wherein, in the formulae F 1 and F' 1 , the symbol G' represents a member selected from the group consisting of ethylene and 1,4-butylene.

Claim 26

Dependent Claim 58 words

A blockc copolymer as defined by claim 20, wherein, in the formulae F 1 and F' 1 , the symbols G and G' represent divlent radicals of the formula F 3 , in which the symbol T represents a member selected from the group consisting of para-phenylene, para-cyclohexylene, 1,5-naphthylene or 2,7-naphthylene, and a radical of the formulae: ##STR87##

Claim 27

Dependent Claim 30 words

A block copolymer as defined by claim 20, wherein in the formulae F 1 and F' 1 , the symbols G and G' represent divalent radicals of the formulae: ##STR88##

Claim 28

Dependent Claim 54 words

A block copolymer as defined by claim 18, comprising a plurality of recurring units of the structural formula F" 1 : --A(SiR.sub.2 G'SiR.sub.2 A).sub.2p SiR.sub.2 G'SiR.sub.2 ASiR.sub.2 (OSiR.sub.2).sub.n ] corresponding to the formula F 1 and F' 1 , in which the symbols G are identical to G' and the symbols a represent 1.

Claim 29

Dependent Claim 68 words

A block copolymer as defined in claim 18, comprising a plurality of recurring units selected from the group consisting of those of the structural formulae: ##STR89## p and n, in pairs, =12 and 111; 6.95 and 125; ##STR90## p and n, in pairs, =2 and 68; 3 and 37; 7 and 14.3; 9.5 and 115; 13.3 and 68; ##STR91## wherein the symbol S indicates a saturated ring; ##STR92##

Claim 30

Dependent Claim 170 words

A process for the preparation of a block copolymer comprising the structural formula F 1 units as defined by claim 18 wherein: (i) a crystalline organosilicic copolymer having the structural formula F i : A' [SiR.sub.2 (GSiR.sub.2).sub.a ASiR.sub.2 G'SiR.sub.2 A].sub.p SiR.sub.2 (GSiR.sub.2).sub.a A' is prepared by polyaddition of p+1 units of the diethylenic organosilicic compound of the formula A'SiR 2 (GSiR 2 ) a A' and p units of the dihydrogenated organosilicic compound of the formula HSiR 2 G'SiR 2 H, and (ii) at least one unit of the organosilicic copolymer of the formula F i is then reacted with at least one unit of the α,ω-dihydrogenopolydiorganosiloxane of the formula HSiR 2 (OSiR 2 ) n H, and wherein the above formulae, the symbols A, R, G, G', G', a, p and n have the meaning of the symbols included in the formula F 1 , and the symbols A', which are identical, represent linear or branched chain alkenyl radicals having from 2 to 6 carbon atoms, or cyclohexenyl radicals.

Claim 31

Dependent Claim 169 words

A process for the preparation of a block copolymer comprising the structural formula F' 1 units as defined by claim 18, wherein: (i) a crystalline organosilicic copolymer having the structural formula F h : H[SiR.sub.2 G'SiR.sub.2 ASiR.sub.2 (GSiR.sub.2).sub.a A].sub.p SiR.sub.2 G'SiR.sub.2 H is prepared by polyaddition of p+1 units of the dihydrogenated organosilicic compound of the formula HSiR 2 G'SiR 2 H and p units of the diethylenic organosilicic compound of the formula A'SiR 2 (GSiR 2 ) a A', and (ii) at least one unit of the organosilicic copolymer of the formula F h is then reacted with at least one unit of the α,ω-diethylenic polydiorganosiloxane of the formula A'SiR 2 (OSiR 2 ) n A', and wherein the above formulae, the symbols A, R, G, G', a, p and n have the meaning of the symbols included in the formula F 1 , and the symbols A', which are identical, represent linear or branched chain alkenyl radicals having from 2 to 6 carbon atoms, or cyclohexenyl radicals.

Claim 32

Dependent Claim 168 words

A process for the preparation of a block copolymer comprising the structural formula F" 1 units as claimed by claim 26, wherein: (i) a crystalline organosilicic copolymer having the formula F' i : A'[SiR.sub.2 G'SiR.sub.2 A].sub.2p SiR.sub.2 G'SiR.sub.2 A' is prepared by polyaddition of the hydrogenomonoethylenic organosilicic compound of the formula A'SiR 2 G'SiR 2 H with itself 2p times, in the presence of one unit of a compound of the formula A'SiR 2 G'SiR 2 A' as the blocking element, and (ii) at least one unit of the copolymer of the formula F' i is then reacted with at least one unit of the α,ω-dihydrogenopolydiorganosiloxane of the formula HSiR 2 (OSiR 2 ) n H, and wherein the above formulae, the symbols A, R, G, G', a, p, and n have the meaning of the symbols included in the formula F 1 , and the symbols A', which are identical, represent linear or branched chain alkenyl radicals having from 2 to 6 carbon atoms, or cyclohexenyl radicals.

Claim 33

Dependent Claim 170 words

A process for the preparation of a block copolymer comprising the structural formula F" 1 units as defined by claim 26, wherein: (i) a crystalline organosilicic copolymer having the structural formula F' h : H[SiR.sub.2 G'SiR.sub.2 A].sub.2p SiR.sub.2 G'SiR.sub.2 H is prepared by polyaddition of the hydrogenomonoethylenic organosilicic compound of the formula A'SiR 2 G'SiR 2 H with itself 2p times, in the presence of one unit of a compound of the formula HSiR 2 G'SiR 2 H as the blocking element, and (ii) at least one unit of the copolymer of the formula F' h is then reacted with at least one unit of the α,ω-diethylenic polydiorganosiloxane of the formula A'SiR 2 (OSiR 2 ) n A', and wherein the above formulae, the symbols A, R, G, G', a, p and n have the meaning of the symbols included in the formula F 1 , and the symbols A', which are identical, represent linear or branched chain alkenyl radicals having from 2 to 6 carbon atoms, or cyclohexenyl radicals.

Claim 34

Dependent Claim 46 words

A process as defined by claims 28, 29, 30 or 31, wherein each reaction is carried out in the presence of a metal catalyst or of inorganic or organic derivatives thereof, said metal being selected from the group consisting of platinum, palladium, ruthenium, rhodium, and iridium.

Claim 35

Dependent Claim 42 words

A process as defined by claim 32, wherein each reaction is carried out in a solution or suspension of an inert organic solvent selected from the group consisting of aliphatic and cycloaliphatic hydrocarbons, halogenated ,erivatives thereof, aromatic hydrocarbons, and halogenated aromatic hydrocarbons.

Claim 36

Dependent Claim 41 words

A process as defined by claim 33, wherein the second stage reaction takes place in the homogeneous reaction medium of the first stage, without first isolating the organosilicic copolymer F i , F h , F' i or F' h .

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1983-11-11	1984-05-12	1984-11-11	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1987-11-11	1988-05-12	1988-11-11	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1991-11-11	1992-05-12	1992-11-11	$7700.00	Window Closed / Lapsed

Elastomeric organopolysiloxane block copolymers and non-elastomeric organosilicic copolymer blocks therefor

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