Radiation cured and monomer modified silicon elastomers

• US 4,158,617 A
• Filed: 03/08/1976
• Issued: 06/19/1979
• Est. Priority Date: 03/08/1976
• Status: Expired due to Term

• Current Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Original Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Eldred, Roger J.
• Primary Examiner(s): Briggs, Sr., Wilbert J.
• Application Number:
  US05/664,662
• Time in Patent Office: 1,198 Days
• Field of Search: 204/159.13, 260/37 SB, 260/42.15, 260/42.26, 260/827
• US Class Current: 522/99
• CPC Class Codes: C08F 220/20 of polyhydric alcohols or phenols , e.g. 2-hydroxyethyl (meth)acrylate or glycerol mono-(meth)acrylate
• CPC Class Codes: C08F 283/124 on to polysiloxanes having carbon-to-carbon double bonds

Abstract

In accordance with a preferred embodiment of this invention, a tear resistant silicone elastomer, which has improved elongation properties, is produced. This elastomer is the radiation induced reaction product of a noncured methyl vinyl silicone resin (VMQ) and uniformly dispersed therein a blend of a polyfunctional acrylic crosslinking monomer and a filler.

Claims

1. An elastomer comprising the high energy electron beam radiation induced reaction product of a uniform mixture comprising about 100 parts by weight of a silicone elastomer selected from the group consisting of methyl vinyl silicone (VMQ) and phenyl vinyl methyl silicone (PVMQ), from about 2 to about 8 parts of a polyfunctional acrylic monomer selected from the group consisting of trimethylolpropanetrimethacrylate and polyethylene glycol dimethacrylates and a filler, said monomer and filler being thoroughly blended prior to the preparation of said uniform mixture, said elastomer having a "cure factor" of less than 45.

2. A tear resistant elastomer having improved elongation properties, said elastomer comprising the high energy electron beam radiation induced reaction product of a uniform mixture comprising about 100 parts by weight of a silicone elastomer selected from the group consisting of methyl vinyl silicone (VMQ) and phenyl vinyl methyl silicone (PVMQ) and from about 2 to about 6 parts of a polyfunctional acrylic monomer selected from the group consisting of trimethylolpropanetrimethacrylate and polyethylene glycol dimethacrylates and a filler, said monomer and filler being thoroughly blended prior to the preparation of said uniform mixture, said elastomer having a "cure factor" less than about 20.

3. A tear resistant silicone elastomer being improved elongation properties, said elastomer comprising the high energy electron beam radiation induced reaction product of a uniform mixture comprising about 100 parts by weight of a silicone elastomer selected from the group consisting of methyl vinyl silicone (VMQ) and phenyl vinyl methyl silicone (PVMQ), and about 10 to 60 parts by weight of a reinforcing filler, said filler being blended with from about 2 to about 6 parts by weight of a polyfunctional acrylic monomer selected from the group consisting of trimethylolpropanetrimethacrylate and polyethylene glycol dimethacrylates prior to the preparation of said uniform mixture, said elastomer having a "cure factor" less than about 20.

4. A tear resistant elastomer having improved elongation properties, said elastomer comprising the high energy electron beam radiation induced reaction product of a uniform mixture comprising about 100 parts by weight of a silicone elastomer selected from the group consisting of methyl vinyl silicone (VMQ) and phenyl vinyl methyl silicone (PVMQ) and from about 50 to about 300 parts of a semi-reinforcing filler, said filler being blended with from about 2 to about 6 parts of a polyfunctional acrylic monomer selected from the group consisting of trimethylolpropanetrimethacrylate and polyethylene glycol dimethacrylates prior to the preparation of said uniform mixture, said elastomer having a "cure factor" less than about 20.

5. An article formed from a tear resistant silicone elastomer having improved elongation properties, said elastomer comprising the high energy electron beam radiation induced reaction product of a uniform mixture comprising about 100 parts by weight of a silicone elastomer selected from the group consisting of methyl vinyl silicone (VMQ) and phenyl vinyl methyl silicone (PVMQ) and from about 2 to about 6 parts of a polyfunctional acrylic monomer selected from the group consisting of trimethylolpropanetrimethacrylate and polyethylene glycol dimethacrylate, and a filler, said monomer and filler being thoroughly blended prior to the preparation of said uniform mixture, said elastomer having a "cure factor" less than about 20.

6. A method of forming a tear resistant silicone elastomer having improved elongation properties comprising the steps of:

(a) forming a uniform mixture comprising by weight, about 100 parts silicone elastomer selected from the group consisting of vinyl methyl silicone (VMQ) and phenyl vinyl methyl silicone (PVMQ) and from about 2 to about 6 parts of a polyfunctional acrylic monomer selected from the group consisting of trimethylolpropanetrimethacrylate and polyethylene glycol dimethacrylate, which monomer has been previously blended with a filler; and

(b) subjecting said mixture to a high energy electron beam radiation dose of from about 2 to about 8 Mrads, and wherein said method, the "cure factor" of said elastomer does not exceed about 20.

7. A method of forming a silicone elastomer comprising the steps of:

(a) forming a uniform mixture comprising by weight, about 100 parts silicone elastomer selected from the group consisting of vinyl methyl silicone (VMQ) and phenyl vinyl methyl silicone (PVMQ) and from about 2 to about 8 parts of a polyfunctional acrylic monomer selected from the group consisting of trimethylolpropanetrimethacrylate and polyethylene glycol dimethacrylate, which monomer has been previously blended with a filler; and

(b) subjecting said mixture to a high energy electron beam radiation dose of from about 2 to about 8 Mrads; and

wherein said method, the "cure factor" of said elastomer does not exceed about 45.

8. A method of forming a tear resistant silicone elastomer having improved elongation properties comprising the steps of:

(a) forming a uniform mixture comprising 100 parts of dimethyl methyl vinyl silicone and from about 10 to about 60 parts of a reinforcing silica filler said filler being blended with from about 2 to about 6 parts of a polyfunctional acrylic monomer selected from the group consisting of trimethylolpropanetrimethacrylate and polyethacrylate and polyethylene glycol dimethacrylates prior to the preparation of said uniform mixture; and

(b) subjecting said mixture to a high energy electron beam radiation dose of from about 2 to 10 Mrads, wherein said method, the "cure factor" of said elastomer does not exceed about 20.