Novel methacrylated siloxanes

• US 4,665,147 A
• Filed: 09/24/1984
• Issued: 05/12/1987
• Est. Priority Date: 06/30/1983
• Status: Expired due to Term

• Current Assignee: Loctite Corporation (Henkel AG & Co KGaA)
• Original Assignee: Loctite Corporation (Henkel AG & Co KGaA)
• Inventors: Nakos, Steven T., Lien, Qcheng S.
• Primary Examiner(s): Marquis, Melvyn I.
• Application Number:
  US06/654,058
• Time in Patent Office: 960 Days
• Field of Search: 528/26, 528/31, 528/32, 528/15, 556/437, 556/440
• US Class Current: 528/15
• CPC Class Codes: C07F 7/0838 Compounds with one or more Si-O-Si sequences compounds with a ring containing only alternating Si and O atoms, i.e. cyclosilanes C07F7/21
• CPC Class Codes: C08G 77/20 containing silicon bound to unsaturated aliphatic groups C08G77/045 takes precedence
• CPC Class Codes: C08G 77/38 Polysiloxanes modified by chemical after-treatment C08G77/045 takes precedence
• CPC Class Codes: C08G 77/46 containing polyether sequences

Abstract

Methacrylated siloxanes are prepared by hydrosilation of beta(allyloxy)ethyl methacrylate using a silicon hydride functional siloxane. Propene elimination is not a significant side reaction of the method. Methacrylated silicones prepared in accordance with the invention are capable of anaerobic cure.

Claims

1. A method of preparing a methacrylated organosiloxane compound comprising reacting an organosiloxane compound having silicon hydride functionality comprising a plurality of repeat units of the formula:

##STR6## where R is an organo group and a is 1 or 2, with beta(allyloxy)ethyl methacrylate in the presence of an amount of hydrosilation catalyst effective for catalyzing a hydrosilation reaction between the allyl group on said methacrylate and said silicon hydride functional organosiloxane.

2. A method as in claim 1 wherein a hydrosilation catalyst is selected from platinum-based and rhodium-based catalysts.

3. A method as in claim 2 wherein said catalyst is chloroplatinic acid.

4. A method as in claim 1 wherein the silicon hydride functional siloxane compound is a polyorganosiloxane having a molecular weight of 2500 or more.

5. A method as in claim 2 wherein the hydrosilation catalyst is selected from platinum and hydrocarbon platinum complexes.

6. A method as in claim 1 wherein R is a hydrocarbon group.

7. A method as in claim 6 wherein R is methyl.

8. A method as in claim 1 wherein said silicon hydride functional siloxane is selected from tetramethyldisiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane and polydimethyl silicones containing a plurality of methylhydrosiloxane repeat units.