UV curable silicone block copolymers

Claim 2

A silicone block copolymer composition, comprising: (a) at least one block consisting essentially of from about 6 to about 120 units of the formula R.sub.2 SiO, (b) at least one block consisting essentially of from about 3 to about 160 units of the formula R.sup.1 SiO.sub.1.5, and (c) at least one block consisting essentially of from about 0.1 to about 20 mole percent of (a) and (b) of units of the formula R.sup.3 RSiO; where R is an independently selected alkyl radical having 1 to 5 carbon atoms, aryl radical having 6 to 10 carbon atoms, or aralkyl radical having 6 to 10 carbon atoms; R 1 is an aryl or aralkyl radical having 6 to 10 carbon atoms; and R 3 is an acrylic-functional radical having the general formula ##STR10## where the R 4 radicals are the same or different and represent hydrogen atoms or monovalent substituted or unsubstituted hydrocarbon radicals having from 1 to 12 carbon atoms and R 5 is a divalent substituted or unsubstituted hydrocarbon radical having from 2 to 12 carbon atoms.

Claim 3

The composition of claim 1, further comprising at least one block consisting essentially of from 1 to about 80 units of the formula R.sup.2 SiO.sub.1.5 where R 2 is an alkyl radical having from 1 to 5 carbon atoms.

Claim 4

The composition of claim 1 wherein siloxane block (a) consists essentially of from about 6 to about 50 units, siloxane block (b) consists essentially of from about 4 to about 75 units, and siloxane block (c) consists essentially of from about 0.5 to about 10 mole percent of the sum of said (a) blocks and (b) blocks.

Claim 5

The compositions of claim 2 wherein there is present from 1 to about 8 units of the formula R.sup.2 SiO.sub.1.5 where R 2 is an alkyl radical having from 1 to 5 carbon atoms.

Claim 6

The composition of claim 1 wherein R 3 is acryloxypropyl, methacryloxypropyl or a mixture thereof.

Claim 9

The method of claim 6 further comprising adding in step (b) an amount of alkyltrichlorosilane.

Claim 10

The method of claim 6 wherein the aryltrichlorosilane and acrylic-functional dichlorosilane are added to the reaction mass of step (a) simultaneously.

Claim 11

The method of claim 6 wherein the aryltrichlorosilane and acrylic-functional dichlorosilane are added to the reaction mass of step (a) consecutively.

Claim 12

The method of claim 6 wherein reaction of the silanol terminated polydiorganosiloxane and the chlorosilanes is effected by stirring at from about 25° C. to about 50° C. for from about 15 minutes to about 10 hours.

Claim 13

A curable composition, comprising: (A) 100 parts by weight of an organopolysiloxane block copolymer, comprising: (i) at least one block consisting essentially of from about 6 to about 120 units of the formula R.sub.2 SiO, (ii) at least one block consisting essentially of from about 3 to about 160 units of the formula R.sup.1 SiO.sub.1.5, and (iii) at least one block consisting essentially of from about 0.1 to about 20 mole percent of (a) and (b) of units of the formula R.sup.3 RSiO; where R is an independently selected alkyl radical having 1 to 5 carbon atoms, aryl radical having 6 to 10 carbon atoms, or aralkyl radical having 6 to 10 carbon atoms; R 1 is an aryl or aralkyl radical having 6 to 10 carbon atoms; and R 3 is an acrylic-functional radical having the general formula ##STR11## where the R 4 radicals are the same or different and represent hydrogen atoms or monovalent substituted or unsubstituted hydrocarbon radicals having from 1 to 12 carbon atoms and R 5 is a divalent substituted or unsubstituted hydrocarbon radical having from 2 to 12 carbon atoms; and (B) an amount of cure-initiator effective for promoting crosslinking of said organopolysiloxane block copolymer.

Claim 14

A curable composition, comprising: (A) 100 parts by weight of an organopolysiloxane block copolymer, comprising: (i) at least one block consisting essentially of from about 6 to about 120 units of the formula R.sub.2 SiO, (ii) at least one block consisting essentially of from about 3 to about 160 units of the formula R.sup.1 SiO.sub.1.5, and (iii) at least one block consisting essentially of from about 0.1 to about 20 mole percent of (a) and (b) of units of the formula R.sup.3 RSiO; where R is an independently selected alkyl radical having 1 to 5 carbon atoms, aryl radical having 6 to 10 carbon atoms, or aralkyl radical having 6 to 10 carbon atoms; R 1 is an aryl or aralkyl radical having 6 to 10 carbon atoms; and R 3 is an acrylic-functional radical having the general formula ##STR11## where the R 4 radicals are the same or different and represent hydrogen atoms or monovalent substituted or unsubstituted hydrocarbon radicals having from 1 to 12 carbon atoms and R 5 is a divalent substituted or unsubstituted hydrocarbon radical having from 2 to 12 carbon atoms; and (B) an amount of cure-initiator effective for promoting crosslinking of said organopolysiloxane block copolymer.

Claim 15

The composition of claim 11 wherein the block copolymer further comprises at least one block consisting essentially of from 1 to 80 units of the formula R.sup.2 SiO.sub.1.5 where R 2 is an alkyl radical having from 1 to 5 carbon atoms.

Claim 16

The composition of claim 11 wherein siloxane block (A)(i) consists essentially of from about 6 to about 50 units, siloxane block (A)(ii) consists essentially of from about 4 to about 75 units, and siloxane block (A)(iii) consists essentially of from about 0.5 to about 10 mole percent of the sum of said (A)(i) blocks and (A)(ii) blocks.

Claim 17

The composition of claim 12 wherein there is present from 1 to about 8 units of the formula R.sup.2 SiO.sub.1.5 where R 2 is an alkyl radical having from 1 to 5 carbon atoms.

Claim 18

The composition of claim 11 wherein R 3 is acryloxypropyl, methacryloxypropyl or a mixture thereof.

Claim 19

The composition of claim 11 wherein the cure-initiator is a photoinitiator and is present in an amount of from about 0.05 percent by weight to about 5 percent by weight based on the weight of the acrylic-functional block copolymer.

Claim 22

The method of claim 17 wherein the block copolymer further comprises at least one block consisting essentially of from 1 to 80 units of the formula R.sup.2 SiO.sub.1.5 where R 2 is an alkyl radical having from 1 to 5 carbon atoms.

Claim 23

The method of claim 17 wherein siloxane block (A)(i) consists essentially of from about 6 to about 50 units, siloxane block (A)(ii) consists essentially of from about 4 to about 75 units, and siloxane block (A)(iii) consists essentially of from about 0.5 to about 10 mole percent of the sum of said (A)(i) blocks and (A)(ii) blocks.

Claim 24

The method of claim 18 wherein there is present from 1 to about 8 units of the formula R.sup.2 SiO.sub.1.5 where R 2 is a alkyl radical having from 1 to 5 carbon atoms.

Claim 25

The method of claim 17 wherein R 3 is acryloxypropyl, methacryloxypropyl or a mixture thereof.

Claim 26

The method of claim 17 wherein the cure-initiator is a photoinitiator and is present in an amount of from about 0.05 percent by weight to about 5 percent by weight based on the weight of the acrylic-functional block copolymer.

Claim 29

The method of claim 23 wherein the block copolymer further comprises at least one block consisting essentially of from 1 to 80 units of the formula R.sup.2 SiO.sub.1.5 where R 2 is an alkyl radical having from 1 to 5 carbon atoms.

Claim 30

The method of claim 23 wherein siloxane block (A)(i) consists essentially of from about 6 to about 50 units, siloxane block (A)(ii) consists essentially of from about 4 to about 75 units, and siloxane block (A)(iii) consists essentially of from about 0.5 to about 10 mole percent of the sum of said (A)(i) blocks and (A)(ii) blocks.

Claim 31

The method of claim 24 wherein there is present from 1 to about 8 units of the formula R.sup.2 SiO.sub.1.5 where R 2 is an alkyl radical having from 1 to 5 carbon atoms.

Claim 32

The method of claim 23 wherein R 3 is acryloxypropyl, methacryloxypropyl or a mixture thereof.

Claim 33

The method of claim 23 wherein the cure-initiator is a photoinitiator and is present in an amount of from about 0.5 percent by weight to about 5 percent by weight based on the weight of the acrylic-functional block copolymer.

Claim 34

The method of claim 23 wherein curing is effected by exposing said curable composition to an amount of ultraviolet radiation effective for curing said composition.

Claim 35

The method of claim 23 wherein curing is effected by heating said curable composition at an elevated temperature for an amount of time effective for curing said composition.

Claim 36

The method of claim 30 wherein said elevated temperature is at least 100° C.

Claim 37

The method of claim 23 wherein the substrate is an electronic component or device.

Claim 38

An article of manufacture prepared by a process comprising the steps: (I.) applying to a substrate a curable composition comprising: (A) 100 parts by weight of an organopolysiloxane block copolymer, comprising: (i) at least one block consisting essentially of from about 6 to about 120 units of the formula R.sub.2 SiO, (ii) at least one block consisting essentially of from about 3 to about 160 units of the formula R.sup.1 SiO.sub.1.5, and (iii) at least one block consisting essentially of from about 0.1 to about 20 mole percent of (a) and (b) of units of the formula R.sup.3 RSiO; where R is an independently selected alkyl radical having 1 to 5 carbon atoms, aryl radical having 6 to 10 carbon atoms, or aralkyl radical having 6 to 10 carbon atoms; R 1 is an aryl or aralkyl radical having 6 to 10 carbon atoms; and R 3 is an acrylic-functional radical having the general formula ##STR14## where the R 4 radicals are the same or different and represent hydrogen atoms or monovalent substituted or unsubstituted hydrocarbon radicals having from 1 to 12 carbon atoms and R 5 is a divalent substituted or unsubstituted hydrocarbon radical having from 2 to 12 carbon atoms; and (B) an amount of cure-initiator effective for promoting crosslinking of said organopolysiloxane block copolymer; (II.) curing said curable composition.

Claim 39

An article of manufacture prepared by a process comprising the steps: (I.) applying to a substrate a curable composition comprising: (A) 100 parts by weight of an organopolysiloxane block copolymer, comprising: (i) at least one block consisting essentially of from about 6 to about 120 units of the formula R.sub.2 SiO, (ii) at least one block consisting essentially of from about 3 to about 160 units of the formula R.sup.1 SiO.sub.1.5, and (iii) at least one block consisting essentially of from about 0.1 to about 20 mole percent of (a) and (b) of units of the formula R.sup.3 RSiO; where R is an independently selected alkyl radical having 1 to 5 carbon atoms, aryl radical having 6 to 10 carbon atoms, or aralkyl radical having 6 to 10 carbon atoms; R 1 is an aryl or aralkyl radical having 6 to 10 carbon atoms; and R 3 is an acrylic-functional radical having the general formula ##STR14## where the R 4 radicals are the same or different and represent hydrogen atoms or monovalent substituted or unsubstituted hydrocarbon radicals having from 1 to 12 carbon atoms and R 5 is a divalent substituted or unsubstituted hydrocarbon radical having from 2 to 12 carbon atoms; and (B) an amount of cure-initiator effective for promoting crosslinking of said organopolysiloxane block copolymer; (II.) curing said curable composition.

Claim 40

The article of claim 33 wherein the block copolymer further comprises at least one block consisting essentially of from 1 to 80 units of the formula R.sup.2 SiO.sub.1.5 where R 2 is an alkyl radical having from 1 to 5 carbon atoms.

Claim 41

The article of claim 33 wherein siloxane block (A)(i) consists essentially of from about 6 to about 50 units, siloxane block (A)(ii) consists essentially of from about 4 to about 75 units, and siloxane block (A)(iii) consists essentially of from about 0.5 to about 10 mole percent of the sum of said (A)(i) blocks and (A)(ii) blocks.

Claim 42

The article of claim 34 wherein there is present from 1 to about 8 units of the formula R.sup.2 SiO.sub.1.5 where R 2 is an alkyl radical having from 1 to 5 atoms.

Claim 43

The article of claim 33 wherein R 3 is acryloxypropyl, methacryloxypropyl or a mixture thereof.

Claim 44

The article of claim 33 wherein the cure-initiator is a photoinitiator and is present in an amount of from about 0.05 percent by weight to about 5 percent by weight based on the weight of the acrylic-functional block copolymer.

Claim 45

The article of claim 33 wherein curing is effected by exposing said curable composition to an amount of ultraviolet radiation effective for curing said composition.

Claim 46

The article of claim 33 wherein curing is effected by heating said curable composition at an elevated temperature for an amount of time effective for curing said composition.

Claim 47

The article of claim 40 wherein said elevated temperature is at least 100° C.

Claim 48

The article of claim 33 wherein the substrate is an electronic component or device.