Stock material or miscellaneous articles – Layer or component removable to expose adhesive
Reexamination Certificate
1999-05-17
2001-08-07
Ahmad, Nasser (Department: 1772)
Stock material or miscellaneous articles
Layer or component removable to expose adhesive
C036S03500R, C036S03600C, C036S071000, C128S882000, C428S041300, C428S041400, C428S041500, C428S041700
Reexamination Certificate
active
06270872
ABSTRACT:
BACKGROUND
Devices which are attached to the body and other surfaces for cushioning are known, for example, sheet padding, toe-crest pads, heel liners, elbow pads, knee pads, shin pads, forearm pads, wrist pads, finger pads, corn pads, callus pads, blister pads, bunion pads or toe pads. A problem with many of these devices is that they tend to become snagged or caught on clothing, socks, hosiery, bedsheets, shoes, carpeting and the like, and are inadvertently removed or torn away from the body or other surfaces where they were initially applied. It would be desirable to provide an device with improved “stay-on” time because inadvertent removal from the body or other surfaces is reduced or minimized.
SUMMARY OF THE INVENTION
Parylene is a coating which is characterized as having low-friction (i.e., slippery), chemically non-reactive, non-polar surface. It has been unexpectedly and surprisingly found that despite parylene's slippery, low friction properties, a device coated with parylene could still receive a pressure sensitive adhesive whose adhesion (i.e. bonding or achorage) to the parylene coating would be sufficiently strong that there is minimal delamination of the adhesive when the device is attached to a surface, such as the skin.
It has also been unexpected and surprisingly found that device of the present invention prepared with a parylene coating would have improved stay-on times, compared with comparable articles prepared without a parylene coating. For example, devices such as corn or callus pads prepared according to the present invention using the combination of parylene coating and pressure sensitive adhesive will have improved stay-one times compared with a comparable article prepared as described in PCT/US94/14164 (WO 95/17215).
It has also been unexpected and surprisingly found that a pressure sensitive adhesive can be adhered to certain articles even more securely by applying a parylene coating to at least a portion of the article before the adhesive is applied, to improve retention of the pressure sensitive adhesive on the article.
Accordingly, the present invention is directed towards a device comprising an article coated with parylene wherein a pressure sensitive adhesive is adhered to said parylene coating. Preferably, the parylene coating is continuous about the article. Optionally, the parylene coating may be discontinuous about the article. Preferably the article is comprised of an elastomer. Also preferred is that the pressure sensitive adhesive employed is an acrylic-based adhesive.
The pressure sensitive adhesive can have a peel strength of 0.33-4.93 kN/m (30-450 oz/in), a tack of 50-1000 grams or a shear strength of 10-10,000 minutes or greater.
In another embodiment, the present invention is directed towards a method for cushioning a limb, comprising contacting the limb with a device comprising a cushion or cushioning article coated with parylene wherein a pressure sensitive adhesive is adhered to said parylene coating.
REFERENCES:
patent: 5075174 (1991-12-01), Pyle
patent: 5137780 (1992-08-01), Nichols
patent: 5406163 (1995-04-01), Carson
patent: 507183 A2 (1992-10-01), None
patent: WO 95/17215 (1995-06-01), None
Cline Mojgan
Snyder Daniel B.
Ahmad Nasser
Lipka Robert J.
Schering-Plough Healthcare Products Inc.
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