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Organopolysiloxane-polyurea block copolymer release agents

  • US 5,290,615 A
  • Filed: 08/31/1992
  • Issued: 03/01/1994
  • Est. Priority Date: 06/20/1986
  • Status: Expired due to Term
First Claim
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1. A pressure-sensitive adhesive tape comprising a backing member having a first front side and a second back side, a layer of pressure-sensitive adhesive on said first side and a low adhesion backsize coating on said second side, said backsize coating comprising an organopolysiloxane-polyurea block copolymer comprising the condensation reaction product of an organopolysiloxane diamine reacted with at least one diisocyanate, and up to 95 weight percent of a diamine or dihydroxy chain extender wherein the organopolysiloxane has little contamination from monofunctional or non-functional silicone as determined by the ability of the tape to functionally adhere (PSTC-1) to a glass plate after being removed from said backsize coating.

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