Substantially single phase silicone copolycarbonates, methods, and optical articles made therefrom
AssigneeGeneral Electric Company
InventorsGary Charles Davis, Marc Brian Wisnudel, Irene Dris
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Abstract
The invention relates to substantially single phase silicone copolycarbonates suitable for use in optical articles such as digital versatile disks. The silicone copolycarbonates contain residues of silicone containing and nonsilicone containing bisphenols and have properties particularly suited for use in high density optical data storage media. The invention further relates to the preparation and properties of substantially single phase silicone copolycarbonates having either a blocky or a random structure. The structure of the compositions of the invention is determined by the method of preparation used and may be used to control physical properties.
Claims37
A substantially single phase silicone copolycarbonate comprising:
- a. a repeat unit having structure I
- wherein R1 and R2 are each independently at each occurrence halogen, C1-C6 alkyl or aryl,
- m and n are each independently integers from 0-4,
- W is a linking moiety selected from the group consisting of:
- a bond, a C2-C18 alkylidene group, a C3-C12 cycloalkylidene group, a carbon atom optionally substituted by one or two hydrogen atoms or one or two C6-C10 aryl groups or one or two C1-C18 alkyl groups;
- an oxygen atom, a sulfur atom, a sulfonyl (SO2) group and a carbonyl (CO) group;
- and
- b. repeat units having structure II
- wherein R3 is a C2-C10 alkylene group optionally substituted by one or more C1-C10 alkyl or one or more aryl groups;
- and where R4 and R5 are each independently at each occurrence C1-C6 alkoxy, C1-C6 alkyl or aryl;
- z and q are independently integers from 0-4;
- and further
- R6, R7, R8 and R9 are each independently at each occurrence C1-C6 alkyl, aryl, C2-C6 alkenyl, cyano, trifluoropropyl or styrenyl;
- p is an integer from 0-5;
- and
- wherein the siloxane component (R8R9SiO)p of repeat unit II represents from 0 to about 8 percent of the total weight of the silicone copolycarbonate.
A substantially single phase silicone copolycarbonate having a blocky structure comprising from about 90 mole percent to about 99.5 mole percent of repeat units IX
- and from about 0.5 mole percent to about 10 mole percent repeat units X
- wherein p is an integer in the range from 0 to 5, and wherein the average block length of repeat unit X is about 2 or more, and further wherein the siloxane component (Me2SiO)p of repeat unit X represents from 0 to about 8 percent of the total weight of the silicone copolycarbonate.
A substantially single phase silicone copolycarbonate having a random structure comprising from about 90 mole percent to about 99.5 mole percent of repeat units IX
- and from about 0.5 mole percent to about 10 mole percent repeat units X
- wherein p is an integer in the range from 0 to 5 and wherein
- the average block length of repeat unit X is about 1, and further wherein the siloxane component (Me2SiO)p of repeat unit X represents from 0 to about 8 percent of the total weight of the silicone copolycarbonate.
A method for making the substantially single phase silicone copolycarbonate having a random structure comprising from about 90 mole percent to about 99.5 mole percent of repeat units IX
- and from about 0.5 mole percent to about 10 mole percent repeat units X
- wherein p is an integer in the range from 0 to 5 and wherein the average block length of repeat unit X is about 1, and further wherein the siloxane component (Me2SiO)p of repeat unit X represents from 0 to about 8 percent of the total weight of the silicone copolycarbonate, said method comprising reaction of bisphenol A in methylene chloride in the presence of aqueous sodium hydroxide and triethylamine at a pH of between about 8 and about 10.5 to afford an oligomeric BPA-bischloroformate having a degree of oligomerization from about 5 to about 10 and subsequent reaction of said oligomeric BPA-bischloroformate in methylene chloride with eugenol siloxane bisphenol and p-cumylphenol in the presence of aqueous sodium hydroxide and triethylamine at a pH of from about 10 to about 12.
A molded optical article prepared from a substantially single phase silicone copolycarbonate having a random structure, said substantially single phase silicone copolycarbonate comprising from about 90 mole percent to about 99.5 mole percent of repeat units IX
- and from about 0.5 mole percent to about 10 mole percent repeat units X
- wherein p is an integer in the range from 0 to 5, wherein the average block length of repeat unit X is about 1, and further wherein the siloxane component (Me2SiO)p of repeat unit X represents from 0 to about 8 percent of the total weight of the silicone copolycarbonate.
A molded optical article prepared from a substantially single phase silicone copolycarbonate having a blocky structure, said substantially single phase silicone copolycarbonate comprising from about 90 mole percent to about 99.5 mole percent of repeat units IX
- and from about 0.5 mole percent to about 10 mole percent repeat units X
- wherein p is an integer in the range from 0 to 5 and wherein the average block length of repeat unit X is about 2 or more, and further wherein the siloxane component (Me2SiO)p of repeat unit X represents from 0 to about 8 percent of the total weight of the silicone copolycarbonate.
Dependencies are inferred from the claim text.