Method of making double-sided pressure-sensitive adhesive tape
First Claim
Patent Images
1. A solvent-free method for the manufacture of pressure-sensitive adhesive tape comprising the steps of:
- (a) providing first and second solvent-free pressure-sensitive adhesive compositions and forming molten streams thereof;
(b) providing a solvent-free backing-forming material and forming a molten stream thereof;
(c) combining said streams into a single unified molten structure having a first layer of pressure-sensitive adhesive composition formed from said first molten stream of pressure-sensitive adhesive composition, a second layer of pressure-sensitive adhesive composition formed from said second molten stream of pressure-sensitive adhesive composition, and a layer of backing-forming material disposed between said pressure-sensitive adhesive layers, wherein at least one of said layers of adhesive is not coextensive; and
(d) cooling said molten structure to yield a composite pressure-sensitive adhesive tape comprising a backing with first and second major surfaces formed from said backing-forming material, a first layer of normally tacky pressure-sensitive adhesive formed from said first layer of pressure-sensitive adhesive composition on said first major surface, and a second layer of normally tacky pressure-sensitive adhesive formed from said second layer of pressure-sensitive adhesive composition on said second major surface, wherein at least one of said layers of adhesive is non-coextensive.
0 Assignments
0 Petitions
Accused Products
Abstract
A method utilizing melt processing for making a unified, composite tape structure that includes two outer pressure-sensitive adhesive layers and a backing wherein at least one of the two outer adhesive layers is not mutually coextensive.
127 Citations
20 Claims
-
1. A solvent-free method for the manufacture of pressure-sensitive adhesive tape comprising the steps of:
-
(a) providing first and second solvent-free pressure-sensitive adhesive compositions and forming molten streams thereof; (b) providing a solvent-free backing-forming material and forming a molten stream thereof; (c) combining said streams into a single unified molten structure having a first layer of pressure-sensitive adhesive composition formed from said first molten stream of pressure-sensitive adhesive composition, a second layer of pressure-sensitive adhesive composition formed from said second molten stream of pressure-sensitive adhesive composition, and a layer of backing-forming material disposed between said pressure-sensitive adhesive layers, wherein at least one of said layers of adhesive is not coextensive; and (d) cooling said molten structure to yield a composite pressure-sensitive adhesive tape comprising a backing with first and second major surfaces formed from said backing-forming material, a first layer of normally tacky pressure-sensitive adhesive formed from said first layer of pressure-sensitive adhesive composition on said first major surface, and a second layer of normally tacky pressure-sensitive adhesive formed from said second layer of pressure-sensitive adhesive composition on said second major surface, wherein at least one of said layers of adhesive is non-coextensive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification