Radiation grafting of organopolysiloxanes

• US 4,950,546 A
• Filed: 08/18/1988
• Issued: 08/21/1990
• Est. Priority Date: 05/02/1985
• Status: Expired due to Fees

• Current Assignee: Raychem Limited (TE Connectivity Limited)
• Original Assignee: Raychem Limited (TE Connectivity Limited)
• Inventors: Dubrow, Robert S., Uken, William D., Dittmer, Catherine A.
• Primary Examiner(s): KENDELL, LORRAINE
• Application Number:
  US07/233,941
• Time in Patent Office: 733 Days
• Field of Search: 428/420, 428/412, 428/447
• US Class Current: 428/447
• CPC Class Codes: C08J 2483/00 Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31536 Including interfacial reaction product of adjacent layers
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

This invention provides for the radiation grafting of certain organopolysiloxanes to polymeric supports. The organopolysiloxane material is partially crosslinked mixture which contains from about 10% to about 90% by weight of uncrosslinked organopolysiloxane oil and has a cone penetration of about 100 to about 350 (10^-1 mm) and an ultimate elongation of at least about 100%. The organopolysiloxane fluid may be placed on the polymeric support and crosslinked to produce an organopolysiloxane material having the above properties and being bonded to the polymeric support. The organopolysiloxane material also can be crosslinked to the above properties by conventional means then placed in contact with the polymeric support and irradiated to crosslink the material to the polymeric support without substantially changing the properties of the organopolysiloxane material.

Claims

1. An article comprising a polymeric support and grafted thereon a mixture of a crosslinked organopolysiloxane and from about 10 to about 90% by weight uncrosslinked organopolysiloxane oil which mixture has a cone penetration of about 100 to 350 (10^-1 mm) and an ultimate elongation of at least about 100%.

2. An article according to claim 1 wherein the uncrosslinked organopolysiloxane oil is present between about 25% and about 75%.

3. An article according to claim 2 wherein the uncrosslinked organopolysiloxane oil is present in an amount between about 30% and about 70% by weight.

4. An article according to claim 1 wherein the organopolysiloxane material comprises a polydimethylsiloxane.

5. An article according to claim 2 wherein the organopolysiloxane material comprises a polydimethylsiloxane.

6. An article according to claim 1 wherein up to about 5% of the polydimethylsiloxane is terminated with divinylmethylsiloxane groups.

7. An article according to claim 2 wherein up to about 5% of the polydimethylsiloxane is terminated with divinylmethylsiloxane groups.

8. An article according to claim 1 wherein the mixture is grafted on the support by electron beam irradiation.

9. An article according to claim 7 wherein the article is in the form of a tape.

10. An article according to claim 8 wherein the article is in the form of a tape.