Curable silicone resin composition that is recyclable
AssigneeShin-Etsu Chemical Co., Ltd.
InventorShoji FUJITA
Life of this patent
Estimating the term…
Abstract
Provided is a silicone resin composition with recyclability which can be easily liquefied through heat application. The curable silicone resin composition contains (A) a furanyl group-containing organopolysiloxane having a number average molecular weight of 500 to 40,000 and (B) a maleimide group-containing organopolysiloxane having a number average molecular weight of 500 to 40,000. Also provided is a method of recycling a curable silicone resin composition, including a step of heating a cured product of the curable silicone resin composition to 130° C. or higher.
Claims5
A curable silicone resin composition comprising the components (A) and (B) of:
- (A) a furanyl group-containing organopolysiloxane having a number average molecular weight of 500 to 40,000 and represented by a formula (1) defined in the following as:
- wherein, in the formula (1), each R1 independently represents a group selected from the group consisting of a hydrogen atom, a monovalent hydrocarbon group having 1 to 10 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a hydroxyl group, and furanyl groups represented by formulae (2) and (3) as defined below, wherein at least two of the R1s in each molecule are each a furanyl group represented by a formula (2) or (3) as defined below, and wherein a is a number of 2 or more, b is a number of 0 or more, c is a number of 0 or more, d is a number of 0 or more, and they satisfy 2≤a+b+c+d≤500,
- wherein, in the formulae (2) and (3), each of the R2 s and R3s independently represents a hydrogen atom or a linear alkyl group having 1 to 10 carbon atoms, and the broken lines represent bonds;
- and
- (B) a maleimide group-containing organopolysiloxane having a number average molecular weight of 500 to 40,000 and represented by a formula (4) defined in the following as:
- wherein, in the formula (4), each R4 independently represents a monovalent hydrocarbon group having 1 to 10 carbon atoms or a maleimide group represented by a formula (5) as defined below, wherein at least two of the R4 s in each molecule are each a maleimide group represented by a formula (5) as defined below, and wherein e is a number of 2 or more, f is a number of 0 or more, g is a number of 0 or more, h is a number of 0 or more, and they satisfy 2≤e+f+g+h≤500,
- wherein, in the formula (5), each R5 independently represents a hydrogen atom or a methyl group, and the broken line represents a bond.
A method of recycling a curable silicone resin composition, comprising a step of heating a cured product of the curable silicone resin composition according to claim 1 to 130° C. or higher.
Dependencies are inferred from the claim text.