Silicone Pressure Sensitive Adhesives, Articles and Methods
Patent - The present invention provides pressure sensitive adhesives (PSAs) adhesive articles, and methods. Preferably, the articles are in the form of tapes, such as foam tapes, for example. Significantly, the PSAs include a polydiorganosiloxane polyurea copolymer and a silicone tackifying resin with little or no silanol (Si-OH) functionality, yet provide high and stable adhesion to a wide variety of substrates. Prior to this it was not appreciated that for silicone polyurea-based pressure sensitive adhesive, little or no silanol functionality in the silicone tackifying resin could enhance adhesion. The adhesive of the present invention can form a discontinuous layer (e.g., pattern) on the substrate (e.g., backing of a tape) or it can form a continuous layer on at least one major surface thereof. It is a pressure sensitive adhesive, which unlike a heat activated adhesive, typically uses pressure to engage adhesion at room temperature (about 20°C to about 30°C) and does not require the use of a heating device. Generally, the pressure sensitive adhesives of the present invention include: a silicone tackifying resin having no greater than about 1.5% by weight (wt-%) Si-OH functional groups (preferably, no greater than about 1.2 wt-%, more preferably, no greater than about 1.0 wt-%, and most preferably, no greater than about 0.8 wt-%) based on the total weight of the silicone tackifying resin; and a polydiorganosiloxane polyurea copolymer. Significantly, such pressure sensitive adhesives, as a result of the low silanol content in the silicone tackifying resin, adhere to both high and low surface energy materials better than conventional silicone adhesives with higher silanol content. Methods of making such adhesives are also provided. The present invention provides a silicone pressure sensitive adhesive that includes: a silicone tackifying resin having no greater than 1.5 percent by weight (wt-%) Si-OH functional groups; and a polydiorganosiloxane polyurea copolymer wherein the silicone tackifying resin is present in an amount of at least 40 weight parts based on 100 weight parts of silicone tackifying resin plus polydiorganosiloxane polyurea copolymer. Preferably, the pressure sensitive adhesive adheres to both high and low surface energy materials as well as those in between, wherein the high surface energy material has a surface energy above about 70 dynes/centimeter (dynes/cm) and the low surface energy material has a surface energy below about 50 dynes/cm.
Source : EFB 11-03 01458832/EP-B1 NDN- 080-0343-0544-3 INVENTOR- MELANCON, Kurt C. Post Office Box 33427 Saint Paul, MN 55133-3427 US INVENTOR- KREMER, Anthony M. Post Office Box 33427 Saint Paul, MN 55133-3427 US INVENTOR- SHERMAN, Audrey A. Post Office Box 33427 Saint Paul, MN 55133-3427 US INVENTOR- ZHOU, Zhiming Post Office Box 33427 Saint Paul, MN 55133-3427 US INVENTOR- TUMEY, Michael L. Post Office Box 33427 Saint Paul, MN 55133-3427 US INVENTOR- LUNSFORD, Duane A. Post Office Box 33427 Saint Paul, MN 55133-3427 US CITATION INFORMATION- 0 667 382/EP-A; 0 380 236/EP-B; 96/34028/WO-A; 96/35458/WO-A; 97/40103/WO-A; 3 772 247/US-A; 5 248 739/US-A PATENT ASSIGNEE- 3M Innovative Properties Company 3M Center P.O.Box 33427 St. Paul, MN 55133-3427 US PATENT NUMBER- 01458832/EP-B1 PATENT APPLICATION NUMBER- 02776255 DATE FILED- 2002-10-22 PUBLICATION DATE- 2011-01-19 PATENT PRIORITY INFORMATION- US, 10027587, 2001-12-18 FIRM- Vossius & Partner, Siebertstrasse 4, 81675 MAnchen, DE INTERNATIONAL PATENT CLASS- C09J00702 ; C09J18310 ; C08G01832; C08G01861; C08G01875; C09J17502 ; C09J18304 PCT APPLICATION NUMBER- US02033780 PCT PUBLICATION NUMBER- WO03052020 PCT PUBLICATION DATE- 2003-06-26 FILING LANGUAGE- English DESIGNATED COUNTRY- , AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, IE, IT, LI, LU, MC, NL, PT, SE, SK, TR LANGUAGE- English
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