Pressure-sensitive adhesives

Details Pressure-sensitive adhesives Pressure-sensitive adhesives

1992-08-12

1995-05-02

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

424448, 428 40, 428200, 428352, 428355, 525 88, 525 95, 525 98, 525222, 525236, 525242, C08L 5300, B32B 712, A61F 1302

Patent

active

054120357

ABSTRACT:
Pressure-sensitive adhesive (PSA) compositions containing a crystalline polymeric additive having an M.sub.w of less than 25,000 and a melting point (T.sub.a) greater than 23.degree. C., preferably 30.degree. to 60.degree. , and PSA composites of a backing, preferably a flexible backing, with such a PSA composition coated thereon. The presence of the additive causes the PSA to lose adhesive strength when heated to T.sub.a. The base resin of the PSA is preferably a polyacrylate or a styrene/butadiene copolymer. The additive, which is preferably present in amount 1 to 35%, e.g. 5 to 30%, is preferably a side chain crystallizable (SCC) polymer.

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