Kaneka Corporation

Akinori Sato

Ayako Yano

Takahiro Saito

Kohei Yamashita

Luc Peeters

Stan Claes

A mixture of polymers (A) and (B), each of the polymers (A) and (B) having a polyoxyalkylene main chain structure and a terminal structure bonded to an end of the main chain structure, is provided. The terminal structures include hydrolyzable silyl groups and further include terminal olefin groups and/or internal olefin groups. The number of the terminal structures per molecule of the polymer (A) is 1.5 or more on average and the number of the terminal structures per molecule of the polymer (B) is 1.2 or less on average. In each of the polymers (A) and (B), the total number of the hydrolyzable silyl, terminal olefin, and internal olefin groups is more than 1.0 on average per terminal structure. In the whole mixture, the percentage of the hydrolyzable silyl groups to the total of the hydrolyzable silyl, terminal olefin, and internal olefin groups is from 40 to 75%.

Mixture of polyoxyalkylene polymers and curable composition

A polyoxyalkylene polymer including a main chain structure of a polyoxyalkylene and terminal structures bonded to ends of the main chain structure is provided. The terminal structures include a hydrolyzable silyl group and further include a terminal olefin group and/or an internal olefin group. The total number of the hydrolyzable silyl, terminal olefin, and internal olefin groups is more than 1.0 on average per terminal structure, and the ratio of the number of moles of the hydrolyzable silyl groups to the total number of moles of the hydrolyzable silyl, terminal olefin, and internal olefin groups is from 0.3 to 0.7.

Polyoxyalkylene polymer and curable composition

A curable composition containing a polyoxyalkylene polymer (A) having a reactive silyl group and a (meth)acrylic ester polymer (B) having a reactive silyl group is provided. 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. 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 the average number per molecule of the reactive silyl groups bonded inside the polymer backbone is from 0 to less than 0.30.

Curable composition and cured product

Provided is a curable composition which is free of organotin compounds to be environmentally friendly and whose cured product shows high elongation and high elastic recovery to be suitable particularly as a sealant. The present invention relates to a curable composition containing a reactive silyl group-containing organic polymer (A) which has a highly active reactive silyl group at a molecular chain end, and a compound (B) having 2 to 10 ethyloxy groups in its molecule but having no amino group in its molecule, the compound (B) being a C1-C20 saturated hydrocarbon having one alkoxysilyl group, a C1-C20 hydrocarbon having two or more alkoxysilyl groups, or a C1-C20 polycarboxylic acid ester.

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Takasago, Japan

Akinori Sato