	US 12,152,143 B2
	Curable composition and cured product
Akinori Sato, Takasago (JP)
Assigned to KANEKA CORPORATION, Osaka (JP)
Filed by KANEKA CORPORATION, Osaka (JP)
Filed on Sep. 22, 2021, as Appl. No. 17/481,520.
Application 17/481,520 is a continuation of application No. PCT/JP2020/012224, filed on Mar. 19, 2020.
Claims priority of application No. 2019-062765 (JP), filed on Mar. 28, 2019.
Prior Publication US 2022/0002541 A1, Jan. 6, 2022
Int. Cl. C08L 71/02 (2006.01); C08L 33/04 (2006.01)

CPC C08L 71/02 (2013.01) [C08L 33/04 (2013.01); C08L 2312/00 (2013.01)]

8 Claims

1. A curable composition comprising:

a polyoxyalkylene polymer (A) having a reactive silyl group represented by the following formula (1):

—SiR¹_aX_3-a (1),

wherein R¹represents a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms, X represents a hydroxy group or a hydrolyzable group, and a is 0, 1, or 2, and

wherein when there are two or more R¹or X groups, the R¹or X groups may be the same or different; and

a (meth)acrylic ester polymer (B) having a reactive silyl group represented by the following formula (2):

—SiR²_bY_3-b (2),

wherein R²represents an unsubstituted hydrocarbon group having 1 to 20 carbon atoms, Y represents a hydroxy group or a hydrolyzable group, and b is 0, 1, or 2, and

wherein when there are two or more R²or Y groups, the R²or Y groups may be the same or different,

wherein in the polyoxyalkylene polymer (A), an average ratio per molecule of a number of reactive silyl groups to a number of ends of a polymer backbone is 0.80 or more, and

wherein in the (meth)acrylic ester polymer (B), an average number per molecule of the reactive silyl groups bonded at ends of a polymer backbone is from 0.30 to 1.00, and an average number per molecule of the reactive silyl groups bonded inside the polymer backbone is from 0 to less than 0.30.