Acrylic functional silicone copolymers

• US 4,503,208 A
• Filed: 01/30/1984
• Issued: 03/05/1985
• Est. Priority Date: 06/30/1983
• Status: Expired due to Term

• Current Assignee: Locite Corporation
• Original Assignee: Loctite Corporation (Henkel AG & Co KGaA)
• Inventors: Nakos, Steven T., Lin, Samuel Q. S.
• Primary Examiner(s): Marquis, Melvyn I.
• Application Number:
  US06/575,256
• Time in Patent Office: 400 Days
• Field of Search: 528/32, 528/31, 528/15, 528/26, 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

Novel copolymeric silicones including repeat units of the formula

R.sub.a.sup.1 R.sub.b.sup.2 SiO.sub.(4-a-b)/2              (I)

and repeat units of the formula

R.sub.a.sup.3 R.sub.b.sup.4 SiO.sub.(4-a-b)/2              (II)

where R¹, R² and R³ are the same or different alkyl, haloalkyl, aryl, substituted aryl, alkoxy or aryloxy groups; R⁴ is ##STR1## where R⁵ is H or alkyl and R⁶ is an unsaturated divalent hydrocarbon group; a is an integer from 0-2, b is an integer from 1-3 and a+b=1, 2 or 3; and the repeat units of formula II represent no more than about 30% of the total copolymer repeat units.

The copolymers may be rapidly cured by UV light to give useful elastomers or coating films. They may also be cured with traditional peroxide methods including heat and anaerobic activated methods. They are readily prepared by hydrosilation of acrylate or 2-alkylacrylate esters of acetylenic alcohols with SiH functional silicones.

Claims

1. A method of preparing an acrylic functional copolymer comprising reacting by hydrosilation reaction a silicon hydride functional silicone copolymer comprising repeat units of the formula

View Dependent Claims (2, 3, 4, 5, 6)

2. A method as in claim 1 wherein the hydrosilation reaction is conducted at a temperature below about 100°

C.

3. A method as in claim 1 wherein the hydrosilation reaction is conducted in the presence of a platinum or rhodium catalyst.

4. A method as in claim 1 wherein said acrylic ester is propargyl acrylate.

5. A method as in claim 1 wherein the said silicon hydride functional silicone contains no more than 10% silicon hydride containing repeat units.

6. A method as in claim 1 wherein between about 0.3% and 5% of the repeat units in said silicon hydride functional silicone are silicone hydride functional repeat units.