Methacryl function dimethylpolysiloxanes and graft copolymers thereof

• US 5,039,761 A
• Filed: 09/14/1989
• Issued: 08/13/1991
• Est. Priority Date: 09/16/1988
• Status: Expired due to Term

• Current Assignee: Shin-Etsu Chemical Company Limited
• Original Assignee: Shin-Etsu Chemical Company Limited
• Inventors: Yoshioka, Hiroshi, Ono, Ichiro
• Primary Examiner(s): Marquis, Melvyn I.
• Assistant Examiner(s): Glass, M.
• Application Number:
  US07/407,103
• Time in Patent Office: 698 Days
• Field of Search: 528/34, 528/41, 528/25, 556/440, 525/479
• US Class Current: 525/479
• CPC Class Codes: C08F 283/124 on to polysiloxanes having carbon-to-carbon double bonds
• CPC Class Codes: C08F 290/148 Polysiloxanes
• CPC Class Codes: C08F 299/08 from polysiloxanes

Abstract

Novel methacryl functional dimethylpolysiloxanes are provided. Graft copolymers thereof with vinyl monomers exhibit water repellency, mold release properties, slip properties, weatherability, and gas permeability.

Claims

1. A methacryl functional dimethylpolysiloxane having the general formula (1):

##STR23## wherein letters n and m are independently an integer of from 2 to 50.

2. A graft copolymer comprising a methacryl functional dimethylpolysiloxane as set forth in claim 1 and a vinyl monomer copolymerized therewith, said vinyl monomer being slected from the group consisting of a C₂ --C₁₀ alkene, acrylic acid, methacrylic acid, a C₁ --C₂₀ alkyl ester of acrylic acid or methacrylic acid, a C₁ --C₁₀ hydroxyalkyl ester of acrylic acid or methacrylic acid, a C₁ --C₁₂ perfluoroester of acrylic acid or methacrylic acid, acrylamide, methacrylamide, styrene, α

-methylstyrene, p-chloromethylstyrene, fumaric acid, maleic acid, fumaric anhydride, maleic anhydride, vinyltrimethoxysilane, γ

-methacryloxy-propyltrimethoxysilane, acrylonitrile, vinyl pyrrolidone, butadiene, isoprene, chloroprene, cyclopentadiene, vinyl chloride, vinylidene chloride, vinyl acetate and allyl vinyl ether.

3. The methacryl functional dimethylpolysiloxane as set forth in claim 1 having a general formula selected from ##STR24##

4. A method for producing a methacryl functional dimethylpolysiloxane having the general formula (1):

##STR25## wherein letters n and m are independently an integer of from 2 to 50 comprising;

subjecting hexamethylcyclotrisiloxane having formula (2);

##STR26## to ring opening polymerization in the presence of trimethylsilanol (CH₃)₃ SiOH and a pentavalent silicon complex catalyst to synthesize two single silanol-terminated compounds having formulae (3) and (4);

##STR27## wherein letters n and m are as defined above, mixing the single silanol-terminated compounds of formulae (3) and (4) with γ

-methacryloxypropylmethyldichlorosilane in equimolar amounts, and dehydrochlorinating the mixture in the presence of a hydrogen chloride scavenger.