Silane terminated liquid polymers

• US 4,960,844 A
• Filed: 08/03/1988
• Issued: 10/02/1990
• Est. Priority Date: 08/03/1988
• Status: Expired due to Term

• Current Assignee: PRC-DeSoto International, Inc. (Nouryon BV)
• Original Assignee: Products Research & Chemical Corporation
• Inventors: Singh, Hakam
• Primary Examiner(s): Bleutge, John C.
• Assistant Examiner(s): Dean, Jr., Ralph H.
• Application Number:
  US07/227,733
• Time in Patent Office: 790 Days
• Field of Search: 556/419, 556/420, 556/421, 528/25, 528/28, 528/29, 528/17
• US Class Current: 528/17
• CPC Class Codes: C08G 18/837 by silicon containing compounds

Abstract

A liquid polymer which is rapidly curable, at room temperature, to a solid hydrolytically stable elastomer having high tensile and tear strengths, said liquid polymer having the formula: ##STR1## wherein R is a liquid polymeric backbone selected from the group consisting of polyether and polythioether, said backbone having a number average molecular weight of at least 1,500 and having no carboxyl or hydroxyl groups; R¹ is lower alkyl, R² is lower alkyl, R³ is a divalent organic radical having no sulfur atoms, R⁴ is alkylene of from 3 to 6 carbon atoms, and which separates the oxygen atom from X by at least 3 carbon atoms, X is sulfur or --S--R⁵ --S-- wherein R⁵ is alkylene having from 2 to 12 carbon atoms, alkylene thioether of from 4 to 12 carbon atoms or hydrocarbon ether of from 4 to 20 carbon atoms, p is 2 to 4, m is 1 to 3, n is 0 to 2 and the sum of m and n is 3. There is also disclosed a method for curing such liquid polymers.

Claims

1. A liquid polymer which is rapidly curable, at room temperature, to a solid hydrolytically stable elastomer having high tensile and tear strengths, said liquid polymer having the formula:

##STR5## wherein R is a liquid polymeric backbone selected from the group consisting of polyether and polythioether, said backbone having a number average molecular weight of at least 1,500 and having no carboxyl or hydroxyl groups;

R¹ is lower alkyl, R² is lower alkyl, R³ is a divalent organic radical having no sulfur atoms, R⁴ is alkylene of from 3 to 6 carbon atoms, and which separates the oxygen atom from X by at least 3 carbon atoms, X is sulfur or --S--R⁵ --S-- wherein R⁵ is alkylene having from 2 to 12 carbon atoms, alkylene thioether of from 4 to 12 carbon atoms or hydrocarbon ether of from 4 to 20 carbon atoms, p is 2 to 4, m is 1 to 3, n is 0 to 2 and the sum of m and n is 3.

2. A liquid polymer according to claim 1 wherein R has a number average molecular weight of between about 1,500 and 20,000.

3. A liquid polymer according to claim 2 wherein R is polyether.

4. A liquid polymer according to claim 2 wherein R is polythioether.

5. A liquid polymer according to claim 1 wherein R¹ is methyl and R² is methyl.

6. A liquid polymer according to claim 1 wherein R¹ is methyl and m is 3.

7. A liquid polymer according to claim 1 wherein X is sulfur.

8. A liquid polymer according to claim 7 wherein R⁴ is propylene.

9. A liquid polymer according to claim 1 wherein X is --S--R⁵ --S--.

10. A liquid polymer according to claim 9 wherein R⁵ is alkylene of from 2 to 6 carbon atoms.

11. A liquid polymer according to claim 9 wherein R⁵ is alkylene ether of from 4 to 12 carbon atoms.

12. A cured liquid polymer which is cured using organo titanate to a solid hydrolytically stable elastomer which has high tensile and tear strengths, said liquid polymer having the formula:

##STR6## wherein R is a liquid polymeric backbone selected from the group consisting of polyether and polythioether, said backbone having a number average molecular weight of at least 1,500 and having no carboxyl or hydroxyl groups;

R¹ is lower alkyl, R² is lower alkyl, R³ is a divalent organic radical having no sulfur atoms, R⁴ is alkylene of from 3 to 6 carbon atoms, and which separates the oxygen atom from X by at least 3 carbon atoms, X is sulfur or --S--R⁵ --S-- wherein R⁵ is alkylene having from 2 to 12 carbon atoms, alkylene thioether of from 4 to 12 carbon atoms or hydrocarbon ether of from 4 to 20 carbon atoms, p is 2 to 4, m is 1 to 3, n is 0 to 2 and the sum of m and n is 3.

13. A cured liquid polymer according to claim 12 wherein R has a number average molecular weight of between about 1,500 and 20,000.

14. A cured liquid polymer according to claim 13 wherein said organo-titanate is an aliphatic titanate.

15. A cured liquid polymer according to claim 13 wherein said organo-titanate is lower alkyl titanate.

16. A cured liquid polymer according to claim 13 wherein the amount of organo-titanate is from about 0.5 weight percent to about 10 weight percent based on the weight of said cured liquid polymer.