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US 5,209,981 AGranted
Polyimidesiloxane extended block copolymers
AssigneeOccidental Chemical Corporation
InventorSergio Rojstaczer
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AssigneeOccidental Chemical Corporation
InventorSergio Rojstaczer
Estimating the term…
Disclosed is method of making a polyimidesiloxane extended block copolymer containing at least one polyimide block made by reacting a dianhydride with a diamine that does not contain a siloxane group, and at least one polyimidesiloxane block made by reacting a dianhydride with a diamine that contains at least one siloxane group, where each polyimidesiloxane block is prepared using more than one mole of the dianhydride for each mole of the siloxane-containing diamine. That is, any siloxane-imide blocks in the polyimidesiloxane are formed from amic acid blocks terminated in anhydride groups and any imide blocks in the polyimidesiloxane are formed from amic acid blocks terminated in amine groups. The polyimidesiloxane block copolymers have higher glass transition temperatures than the corresponding non-extended block copolymers while retaining the same solubility.
In a method of making a polyimidesiloxane extended block copolymer from a polyamic acid-siloxane extended block copolymer that contains at least one amic acid block made by reacting a dianhydride with a diamine that does not contain a siloxane group, and at least one siloxane-amic acid block made by reacting a dianhydride with a diamine that contains at least one siloxane group, the improvement which comprises
A method of amking a polyamic acid-siloxane extended block copolymer comprising
A polyamic acid-siloxane extended block copolymer having the general formula ##STR7## where A is an aromatic radical tht does not contain a siloxane group, each A' is independently selected from an aromatic radical that contains no bisether or bissulfide group, each R is independently selected from a substituted or unsubstituted aliphatic mono-radical of 1 to 12 carbon atoms or a substituted or unsubstituted aromatic mono-radical of 6 to 10 carbon atoms, each R' is independently selected from a substituted or unsubstituted aliphatic di-radical of 1 to 12 carbon atoms or a substituted or unsubstituted aromatic di-radical of 6 to 10 carbon atoms, n is 1.5 to 20, p is 1.5 to 20, and m is 0 to 200.
A polyamic siloxane extended block copolymer having the general formula ##STR8## where A is an aromatic radical that does not contain a siloxane gruop, each A' is independently selected from an aromatic radical that contains no bisether or bissulfide group, each R is independently selected from a substituted or unsubstituted aliphatic mono-radical of 1 to 12 carbon atoms or a substituted or unsubstituted aromatic mono-radical of 6 to 10 carbon atoms, each R' is independently selected from a substituted or unsubstituted aliphatic di-radical of 1 to 12 carbon atoms or a substituted or unsubstituted aromatic di-radical of 6 to 10 carbon atoms, n is 1.5 to 20, p is 1.5 to 20, m is 0 to 200, and the proportion of said amic acid blocks to said siloxane blocks is about 0.05 to about 20.
Dependencies are inferred from the claim text.