Terminal cluster vinyl silicones and acrylate cluster silicones therefrom

• US 4,575,546 A
• Filed: 06/22/1984
• Issued: 03/11/1986
• Est. Priority Date: 06/22/1984
• Status: Expired due to Fees

• Current Assignee: Loctite Corporation (Henkel AG & Co KGaA)
• Original Assignee: Loctite Corporation (Henkel AG & Co KGaA)
• Inventors: Klemarczyk, Philip, Lin, Samuel Q. S.
• Primary Examiner(s): Lilling, Herbert J.
• Application Number:
  US06/623,759
• Time in Patent Office: 627 Days
• Field of Search: 526/279, 526/245, 528/32, 528/15, 528/26, 528/901, 556/437, 556/440, 525/288
• US Class Current: 526/245
• CPC Class Codes: C08G 77/20 containing silicon bound to unsaturated aliphatic groups C08G77/045 takes precedence
• CPC Class Codes: C08G 77/50 by carbon linkages C08G77/485 takes precedence
• CPC Class Codes: Y10S 528/901 Room temperature curable silicon-containing polymer

Abstract

A polyorganosiloxane polymer having a structure represented by one of the formulas

(AB).sub.m C

or

[(AB).sub.m ].sub.n SiR.sub.(4-n)

where the R groups are the same or different organic groups other than acrylic groups or groups co-curable therewith; A is a linear polyorganosiloxane segment containing between 3 and about 50 siloxane repeat units at least 3 of which are acrylic group containing repeat units represented by the formula ##STR1## where R¹ is lower alkyl, the R² groups are the same or different alkylene, alkyleneoxy or alkenylene groups, and y is 0-4; B is a polyorganosiloxane segment represented by the formula ##STR2## where x is an integer of at least 100; C is A or a triorganosilyl group; m is an integer of 1 or more; and n is 3 or 4.

Claims

1. A polyorganosiloxane polymer having a structure represented by one of the formulas

View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)

2. The polyorganosiloxane polymer of claim 1 wherein the R groups are selected from substituted or unsubstituted alkyl or aryl groups.

3. The polyorganosiloxane polymer of claim 2 wherein the R groups are selected from phenyl, methyl and trifluoropropyl groups.

4. The polyorganosiloxane polymer of claim 1 wherein R¹ is methyl and R² is alkylene.

5. The polyorganosiloxane polymer of claim 1 wherein R² is propylene.

6. The polyorganosiloxane polymer of claim 1 wherein y is 0 or 1.

7. The polymer of claim 1 wherein said A segment has between 3 and 30 of said siloxane units.

8. The polymer of claim 7 having between 3 and 20 of said A segment siloxane units.

9. The polyorganosiloxane polymer of claim 1 prepared by a method comprising hydrosilating a cluster vinyl silicone of the formula

10. The polymer of claim 9 wherein y is 0 or 1;

R is methyl and R² is propyl.

11. The polymer of claim 9 wherein said D segment contains at least three repeat units having pendant vinyl or allyl groups.

12. The polymer of claim 1 wherein said A segment comprises 30-60% of said acrylic group containing siloxane repeat units and 40-70% of repeat units represented by the formula ##STR14##

13. The polymer of claim 1 wherein x is at least 160.

14. The polymer of claim 1 wherein x is at least 300.

15. The polymer of claim 1 having a viscosity below about 500,000 cps at 25°

C.

16. A method of preparing a cluster acrylated organosiloxane polymer comprising hydrosilating a cluster vinyl silicone of the formula

View Dependent Claims (17, 18, 19)

17. The method of claim 16 wherein y is 0 or 1, R¹ is methyl and R² is propyl.

18. The method of claim 16 further comprising preparing said cluster vinyl silicone by anionic polymerization of a first polymerizable mixture comprising an alkenyl or alkynyl substituted cyclic polyorganosiloxane followed by extension of the resulting polymer by addition of cyclic organic siloxanes free of ethylenically unsaturated groups or groups co-curable therewith.

19. The method of claim 16 further comprising preparing said cluster vinyl silicone by base catalyzed equilbrium polymerization of alkenyl or alkynyl substituted silanes or low molecular weight organosiloxanes followed by coupling with a silicone terminated with condensable groups.