Siloxane-imide copolymer and addition curable composition comprising same
AssigneeMomentive Performance Materials Inc.
InventorsSubrata Mandal, Tetsuo Fujimoto, Takeshi Sunaga, Ramasubramanian Narayanan
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Abstract
A heat stable siloxane-imide copolymer and a curable silicone adhesive composition comprising such a siloxane-imide copolymer is shown and described herein. The composition includes an alkenyl silicone, a silicone hydride based cross linker, hydrosilylation catalyst and additives that is curable at relatively low temperatures and shows good heat stability.
Claims37
A siloxane-imide copolymer of formula (I):
- where:
- R1 is independently selected from a C5-C20 aryl or a polycyclic aryl group comprising two or more C5-C20 aryl groups, where R1 can be unsubstituted or substituted with a C1-C6 alkyl, a halogen, a haloalkyl, a hydroxy, and/or a C1-C5 alkoxy groups;
- A may be chosen from divalent C5-C20 aryl;
- R2 and R3 are same or different and are independently selected from a C1-C10 alkyl and C6-C20 aryl;
- m is an integer from 1 to about 200;
- and
- n is an integer from 1 to about 30.
An addition curable silicone-imide composition comprising:
- (A) an alkenyl functional siloxane-imide copolymer of formula (I):
- where:
- R1 is independently chosen from a C5-C20 aryl or a polycyclic aryl group comprising two or more C5-C20 aryl groups, where R1 can be unsubstituted or substituted with a C1-C6 alkyl, a halogen, a haloalkyl, a hydroxy, and/or a C1-C5 alkoxy groups;
- A is chosen from a divalent C5-C20 aryl;
- R2 and R3 may be same or different and are independently chosen from C1-C10 alkyl and C6-C20 aryl;
- m is an integer from 1 to about 200;
- and
- n is an integer from 1 to about 30;
- (B) 0 to about 80 parts by mass of an alkenyl functional organosiloxane based on the total weight of the curable silicone-imide composition;
- (C) an amount of a polyorganohydrogensiloxane having at least two hydrogen atoms bonded to silicon atoms in one molecule such that an amount of the hydrogen atoms bonded to silicon atoms is 0.9 to 10 mol relative to 1 mol of a total amount of the alkenyl groups contained in the (A) component;
- (D) a catalytic amount of a hydrosilylation reaction catalyst;
- (E) 0.05 to about 3000 parts by mass of an additive based on the total weight of the curable silicone-imide composition;
- and
- (F) 0 to about 3000 parts by mass of a filler based on the total weight of the curable silicone-imide composition.
An article comprising a substrate, wherein the silicone-imide composition of claim is coated or adhered on a surface of the substrate.
Dependencies are inferred from the claim text.