Curable composition

• US 20020198352A1
• Filed: 06/05/2002
• Published: 12/26/2002
• Est. Priority Date: 06/06/2001
• Status: Abandoned Application

• Current Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Inventors: Tanaka, Hideaki, Kashiwame, Josho, Yamamoto, Hiroshi, Sugiyama, Kayoko, Suzuki, Chitoshi, Watabe, Takashi
• Application Number:
  US10/162,382
• Publication Number:
  US 20020198352A1
• Time in Patent Office: Days
• US Class Current: 528/10
• CPC Class Codes: C08G 65/336 containing silicon

Abstract

A curable composition comprising a reactive silicon group-containing oxyalkylene polymer (A1) having at least one group of the formula 1 at its molecular terminal and satisfying the following (a) to (c), and a curing accelerator:

—O—R⁰—SiX_aR¹_3-a  Formula 1

wherein R⁰ is a C_1-20 bivalent hydrocarbon group which may have —CONH—, —O—, —S—, —CO— or —NH—, R¹ is a C_1-10 monovalent hydrocarbon group, X is a hydroxyl group or a hydrolysable group, and a is 1, 2 or 3, provided that when a plurality of R¹ are present, they may be the same or different from one another, and when a plurality of X are present, they may be the same or different from one another;

(a) the molecular weight per terminal group (M_c) is at least 5,000,

(b) the ratio (M_w/M_n) of the weight average molecular weight (M_w) to the number average molecular weight (M_n) is at least 1.5, and

(c) the main chain is an oxyalkylene polymer which is obtainable by ring-opening polymerization of a cyclic ether using an active hydrogen atom-containing compound as an initiator and which is composed solely of structures based on the initiator and the cyclic ether.

Claims

1. A curable composition comprising a reactive silicon group-containing oxyalkylene polymer (A1) having at least one group of the formula 1 at its molecular terminal and satisfying the following (a) to (c), and a curing accelerator:

—

O—

R⁰—

SiX_aR¹_3-a 

 

Formula 1

wherein R⁰ is a C_1-20 bivalent hydrocarbon group which may have —

CONH—

, —

O—

, —

S—

, —

CO—

or —

NH—

, R¹ is a C_1-10 monovalent hydrocarbon group, X is a hydroxyl group or a hydrolysable group, and a is 1, 2 or 3, provided that when a plurality of R¹ are present, they may be the same or different from one another, and when a plurality of X are present, they may be the same or different from one another;

(a) the molecular weight per terminal group (M_c) is at least 5,000,

(b) the ratio (M_w/M_n) of the weight average molecular weight (M_w) to the number average molecular weight (M_n) is at least 1.5, and

(c) the main chain is an oxyalkylene polymer which is obtainable by ring-opening polymerization of a cyclic ether using an active hydrogen atom-containing compound as an initiator and which is composed solely of structures based on the initiator and the cyclic ether.

2. The curable composition according to claim 1, wherein the reactive silicon group-containing oxyalkylene polymer (A1) is a polymer obtainable by converting a terminal hydroxyl group of a hydroxyl group terminal oxyalkylene polymer (B1) satisfying the following (a), (b) and (d), to a group of the formula 1:

(a) the molecular weight per terminal group (M_c) is at least 5,000,

(b) the ratio (M_w/M_n) of the weight average molecular weight (M_w) to the number average molecular weight (M_n) is at least 1.5, and

(d) it is a hydroxyl group terminal oxyalkylene polymer which is obtainable by ring-opening polymerization of a cyclic ether using an active hydrogen atom-containing compound as an initiator and which is composed solely of structures based on the initiator and the cyclic ether.

3. The curable composition according to claim 2, wherein the hydroxyl group terminal oxyalkylene polymer (B1) is one of, or a mixture of two or more of, hydroxyl group terminal oxyalkylene polymers which are obtainable by ring-opening polymerization of a cyclic ether using an active hydrogen atom-containing compound as an initiator, in the presence of a catalyst.

4. The curable composition according to claim 3, wherein the catalyst is a double metal cyanide complex catalyst.

5. The curable composition according to claim 1, wherein the reactive silicon group-containing oxyalkylene polymer (A1) is a polymer obtainable by converting a group of the formula 2 in an oxyalkylene polymer (C1) having a group of the formula 2 at its molecular terminal and satisfying (a) to (c), to a group of the formula 1:

—

O—

R 

 

Formula 2

wherein R is a C_1-10 monovalent hydrocarbon group having an unsaturated bond.

6. The curable composition according to claim 5, wherein the oxyalkylene polymer (C1) is one of, or a mixture of two or more of, polymers which are obtainable by converting terminal hydroxyl groups of hydroxyl group terminal oxyalkylene polymers obtainable by ring-opening polymerization of a cyclic ether using an active hydrogen atom-containing compound as an initiator, in the presence of a catalyst, to groups of the formula 2.

7. The curable composition according to claim 6, wherein the catalyst is a double metal cyanide complex catalyst.